UM10237
LPC24XX User manual
Rev. 02 — 19 December 2008
User manual
Document information
Info
Content
Keywords
LPC2400, LPC2458, LPC2420, LPC2460, LPC2468, LPC2470, LPC2478,
ARM, ARM7, 32-bit, Single-chip, External memory interface, USB 2.0,
Device, Host, OTG, Ethernet, CAN, I2S, I2C, SPI, UART, PWM, IRC,
Microcontroller
Abstract
LPC24XX User manual release
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UM10237
Chapter 1: LPC24XX Introductory information
Rev. 02 — 19 December 2008
User manual
1. Introduction
NXP Semiconductor designed the LPC2400 microcontrollers around a 16-bit/32-bit
ARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG and
embedded Trace. The LPC2400 microcontrollers have 512 kB of on-chip high-speed
Flash memory. This Flash memory includes a special 128-bit wide memory interface and
accelerator architecture that enables the CPU to execute sequential instructions from
Flash memory at the maximum 72 MHz system clock rate. This feature is available only
on the LPC2000 ARM Microcontroller family of products. The LPC2400 can execute both
32-bit ARM and 16-bit Thumb instructions. Support for the two Instruction Sets means
Engineers can choose to optimize their application for either performance or code size at
the sub-routine level. When the core executes instructions in Thumb state it can reduce
code size by more than 30 % with only a small loss in performance while executing
instructions in ARM state maximizes core performance.
The LPC2400 microcontrollers are ideal for multi-purpose communication applications. It
incorporates a 10/100 Ethernet Media Access Controller (MAC), a USB full speed
device/host/OTG controller with 4 kB of endpoint RAM, four UARTs, two Controller Area
Network (CAN) channels, an SPI interface, two Synchronous Serial Ports (SSP), three I2C
interfaces, and an I2S interface. Supporting this collection of serial communications
interfaces are the following feature components; an on-chip 4 MHz internal precision
oscillator, 98 kB of total RAM consisting of 64 kB of local SRAM, 16 kB SRAM for
Ethernet, 16 kB SRAM for general purpose DMA, 2 kB of battery powered SRAM, and an
External Memory Controller (EMC). These features make this device optimally suited for
communication gateways and protocol converters. Complementing the many serial
communication controllers, versatile clocking capabilities, and memory features are
various 32-bit timers, an improved 10-bit ADC, 10-bit DAC, two PWM units, four external
interrupt pins, and up to 160 fast GPIO lines. The LPC2400 connect 64 of the GPIO pins
to the hardware based Vector Interrupt Controller (VIC) that means these external inputs
can generate edge-triggered, interrupts. All of these features make the LPC2400
particularly suitable for industrial control and medical systems.
2. How to read this manual
Important: The term “LPC24XX“ in this user manual will be used as a generic name for all
LPC2400 parts. It covers the following parts: LPC2458, LPC2420, LPC2460, LPC2468,
LPC2470, and LPC2478.
Table 1.
LPC24XX overview
LPC2458
LPC2420/60 LPC2468
LPC2470
LPC2478
Features
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Chapter 1: LPC24XX Introductory information
Most features and peripherals are identical for all LPC2400 parts. All differences are listed
Table 2.
Differences between LPC2400 parts
Pins/
Flash
EMC
LCD
High-speed
GPIO pins
LPC2458
LPC2460/20
LPC2468
LPC2470
LPC2478
180/136
208/160
208/160
208/160
208/160
512 kB
flashless
512 kB
flashless
512 kB
16-bit
32-bit
32-bit
32-bit
32-bit
no
no
no
yes
yes
3. LPC2400 features
• ARM7TDMI-S processor, running at up to 72 MHz.
• 98 kB on-chip SRAM includes:
– 64 kB of SRAM on the ARM local bus for high performance CPU access.
– 16 kB SRAM for Ethernet interface. Can also be used as general purpose SRAM.
– 16 kB SRAM for general purpose DMA use also accessible by the USB.
– 2 kB SRAM data storage powered from the RTC power domain.
• LPC2458/68/78 only: 512 kB on-chip Flash program memory with In-System
Programming (ISP) and In-Application Programming (IAP) capabilities. Flash program
memory is on the ARM local bus for high performance CPU access.
• Dual Advanced High-performance Bus (AHB) system allows memory access by
multiple resources and simultaneous program execution with no contention.
• EMC provides support for asynchronous static memory devices such as RAM, ROM
and Flash, as well as dynamic memories such as Single Data Rate SDRAM.
• Advanced Vectored Interrupt Controller (VIC), supporting up to 32 vectored interrupts.
• General Purpose AHB DMA controller (GPDMA) that can be used with the SSP, I2S,
and SD/MM interface as well as for memory-to-memory transfers.
• LPC2470/78 only: LCD controller, supporting both Super-Twisted Nematic (STN) and
Thin-Film Transistors (TFT) displays.
– Dedicated DMA controller.
– Selectable display resolution (up to 1024 × 768 pixels).
– Supports up to 24-bit true-color mode.
• Serial Interfaces:
– Ethernet MAC with MII/RMII interface and associated DMA controller. These
functions reside on an independent AHB bus.
– USB 2.0 full-speed dual port device/host/OTG controller with on-chip PHY and
associated DMA controller.
– Four UARTs with fractional baud rate generation, one with modem control I/O, one
with IrDA support, all with FIFO.
– CAN controller with two channels.
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Chapter 1: LPC24XX Introductory information
– SPI controller.
– Two SSP controllers, with FIFO and multi-protocol capabilities. One is an alternate
for the SPI port, sharing its interrupt. SSPs can be used with the GPDMA
controller.
– Three I2C-bus interfaces (one with open-drain and two with standard port pins).
– I2S (Inter-IC Sound) interface for digital audio input or output. It can be used with
the GPDMA.
• Other peripherals:
– SD/MMC memory card interface.
– 160 general purpose I/O pins with configurable pull-up/down resistors.
– 10-bit ADC with input multiplexing among 8 pins.
– 10-bit DAC.
– Four general purpose timers/counters with 8 capture inputs and 10 compare
outputs. Each timer block has an external count input.
– Two PWM/timer blocks with support for three-phase motor control. Each PWM has
an external count inputs.
– Real-Time Clock (RTC) with separate power domain, clock source can be the RTC
oscillator or the APB clock.
– 2 kB SRAM powered from the RTC power pin, allowing data to be stored when the
rest of the chip is powered off.
– WatchDog Timer (WDT). The WDT can be clocked from the internal RC oscillator,
the RTC oscillator, or the APB clock.
• Standard ARM test/debug interface for compatibility with existing tools.
• Emulation trace module supports real-time trace.
• Single 3.3 V power supply (3.0 V to 3.6 V).
• Three reduced power modes: idle, sleep, and power-down.
• Four external interrupt inputs configurable as edge/level sensitive. All pins on PORT0
and PORT2 can be used as edge sensitive interrupt sources.
• Processor wake-up from Power-down mode via any interrupt able to operate during
Power-down mode (includes external interrupts, RTC interrupt, USB activity, Ethernet
wake-up interrupt, CAN bus activity, PORT0/2 pin interrupt).
• Two independent power domains allow fine tuning of power consumption based on
needed features.
• Each peripheral has its own clock divider for further power saving. These dividers help
reducing active power by 20 - 30 %.
• Brownout detect with separate thresholds for interrupt and forced reset.
• On-chip power-on reset.
• On-chip crystal oscillator with an operating range of 1 MHz to 24 MHz.
• 4 MHz internal RC oscillator trimmed to 1 % accuracy that can optionally be used as
the system clock. When used as the CPU clock, does not allow CAN and USB to run.
• On-chip PLL allows CPU operation up to the maximum CPU rate without the need for
a high frequency crystal. May be run from the main oscillator, the internal RC
oscillator, or the RTC oscillator.
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Chapter 1: LPC24XX Introductory information
• Boundary scan for simplified board testing.
• Versatile pin function selections allow more possibilities for using on-chip peripheral
functions.
4. Applications
• Industrial control
• Medical systems
• Protocol converter
• Communications
5. Ordering options
5.1 LPC2458 ordering options
Table 3.
LPC2458 ordering information
Type number
Package
Name
Description
Version
LPC2458FET180 TFBGA180 plastic thin fine-pitch ball grid array package; 180 balls; body 12 x 12 x 0.8 mm SOT570-2
Table 4. LPC2458 ordering options
Type number
Flash
(kB)
SRAM (kB)
External
bus
Ethernet USB
OTG/
SD/
MMC DMA
GP
Temp
range
OHC/
DEV
+ 4 kB
FIFO
LPC2458FET180
512
64 16 16 2 98 16-bit
MII/
yes
2
yes
yes
8
1
−40 °C to
RMII
+85 °C
5.2 LPC2460 ordering options
Table 5.
LPC2420/60 ordering information
Type number
Package
Name
Description
Version
LPC2420FBD208 LQFP208
LPC2460FBD208 LQFP208
plastic low profile quad flat package; 208 leads; body 28 × 28 × 1.4 mm
SOT459-1
SOT459-1
plastic low profile quad flat package; 208 leads; body 28 × 28 × 1.4 mm
LPC2460FET208 TFBGA208 plastic thin fine-pitch ball grid array package; 208 balls; body 15 × 15 × 0.7 mm SOT950-1
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Chapter 1: LPC24XX Introductory information
Table 6.
LPC2420/60 ordering options
Type number
Flash
(kB)
SRAM (kB)
External
bus
Ethernet USB
OTG/
SD/ GP
MMC DMA
Temp
range
OHCI/
DEV
+ 4 kB
FIFO
LPC2420FBD208
LPC2460FBD208
LPC2460FET208
N/A
N/A
N/A
64 -
16 2 82 Full 32-bit
-
yes
-
yes
yes
yes
yes
yes
yes
8
8
8
1
1
1
−40 °C to
+85 °C
64 16 16 2 98 Full 32-bit MII/RMII yes
64 16 16 2 98 Full 32-bit MII/RMII yes
2
2
−40 °C to
+85 °C
−40 °C to
+85 °C
5.3 LPC2468 ordering options
Table 7.
LPC2468 ordering information
Type number
Package
Name
Description
plastic low profile quad flat package; 208 leads; body 28 × 28 × 1.4 mm
Version
LPC2468FBD208 LQFP208
SOT459-1
LPC2468FET208 TFBGA208 plastic thin fine-pitch ball grid array package; 208 balls; body 15 x 15 x 0.7 mm SOT950-1
Table 8. LPC2468 ordering options
Type number
Flash
(kB)
SRAM (kB)
External
bus
Ethernet USB
OTG/
SD/
MMC DMA
GP
Temp
range
OHC/
DEV
+ 4 kB
FIFO
LPC2468FBD208
LPC2468FET208
512
512
64 16 16 2 98 Full 32-bit MII/
RMII
yes
yes
2
2
yes
yes
yes
yes
8
8
1
1
−40 °C to
+85 °C
64 16 16 2 98 Full 32-bit MII/
RMII
−40 °C to
+85 °C
5.4 LPC2470 ordering options
Table 9.
LPC2470 ordering information
Type number
Package
Name
Description
plastic low profile quad flat package; 208 leads; body 28 × 28 × 1.4 mm
Version
LPC2470FBD208 LQFP208
SOT459-1
SOT950-1
LPC2470FET208 TFBGA208 plastic thin fine-pitch ball grid array package; 208 balls; body 15 × 15 ×
0.7 mm
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Chapter 1: LPC24XX Introductory information
Table 10. LPC2470 ordering options
Type number
Flash
(kB)
SRAM (kB)
External Ethernet USB
SD/
MMC DMA
GP
Temp
range
bus
OTG/
OHC/
Device
+ 4 kB
FIFO
LPC2470FBD208 N/A
LPC2470FET208 N/A
64 16
64 16
16
16
2
2
98 Full
MII/RMII yes
2
2
yes
yes
yes
yes
8
8
1
1
−40 °C
to
+85 °C
32-bit
98 Full
32-bit
MII/RMII yes
−40 °C
to
+85 °C
5.5 LPC2478 ordering options
Table 11. LPC2478 ordering information
Type number
Package
Name
Description
plastic low profile quad flat package; 208 leads; body 28 × 28 × 1.4 mm
Version
LPC2478FBD208 LQFP208
SOT459-1
SOT950-1
LPC2478FET208 TFBGA208 plastic thin fine-pitch ball grid array package; 208 balls; body 15 × 15 ×
0.7 mm
Table 12. LPC2478 ordering options
Type number
Flash
(kB)
SRAM (kB)
External Ethernet USB
SD/
MMC DMA
GP
Temp
range
bus
OTG/
OHC/
Device
+ 4 kB
FIFO
LPC2478FBD208 512
LPC2478FET208 512
64 16
64 16
16
16
2
2
98 Full
MII/RMII yes
2
2
yes
yes
yes
yes
8
8
1
1
−40 °C
to
+85 °C
32-bit
98 Full
32-bit
MII/RMII yes
−40 °C
to
+85 °C
6. Architectural overview
The LPC2400 microcontroller consists of an ARM7TDMI-S CPU with emulation support,
the ARM7 local bus for closely coupled, high speed access to the majority of on-chip
memory, the AMBA AHB interfacing to high speed on-chip peripherals and external
memory, and the AMBA APB for connection to other on-chip peripheral functions. The
microcontroller permanently configures the ARM7TDMI-S processor for little-endian byte
order.
The LPC2400 implements two AHB buses in order to allow the Ethernet block to operate
without interference caused by other system activity. The primary AHB, referred to as
AHB1, includes the VIC, GPDMA controller, and EMC.
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The second AHB, referred to as AHB2, includes only the Ethernet block and an
associated 16 kB SRAM. In addition, a bus bridge is provided that allows the secondary
AHB to be a bus master on AHB1, allowing expansion of Ethernet buffer space into
off-chip memory or unused space in memory residing on AHB1.
In summary, bus masters with access to AHB1 are the ARM7 itself, the GPDMA function,
and the Ethernet block (via the bus bridge from AHB2). Bus masters with access to AHB2
are the ARM7 and the Ethernet block.
AHB peripherals are allocated a 2 MB range of addresses at the very top of the 4 GB
ARM memory space. Each AHB peripheral is allocated a 16 kB address space within the
AHB address space. Lower speed peripheral functions are connected to the APB bus.
The AHB to APB bridge interfaces the APB bus to the AHB bus. APB peripherals are also
allocated a 2 MB range of addresses, beginning at the 3.5 GB address point. Each APB
peripheral is allocated a 16 kB address space within the APB address space.
The ARM7TDMI-S processor is a general purpose 32-bit microprocessor, which offers
high performance and very low power consumption. The ARM architecture is based on
Reduced Instruction Set Computer (RISC) principles, and the instruction set and related
decode mechanism are much simpler than those of microprogrammed complex
instruction set computers. This simplicity results in a high instruction throughput and
impressive real-time interrupt response from a small and cost-effective processor core.
Pipeline techniques are employed so that all parts of the processing and memory systems
can operate continuously. Typically, while one instruction is being executed, its successor
is being decoded, and a third instruction is being fetched from memory.
The ARM7TDMI-S processor also employs a unique architectural strategy known as
Thumb, which makes it ideally suited to high-volume applications with memory
restrictions, or applications where code density is an issue.
The key idea behind Thumb is that of a super-reduced instruction set. Essentially, the
ARM7TDMI-S processor has two instruction sets:
• the standard 32-bit ARM set
• a 16-bit Thumb set
The Thumb set’s 16-bit instruction length allows it to approach higher density compared to
standard ARM code while retaining most of the ARM’s performance.
7. On-chip flash programming memory (LPC2458/68/78)
The LPC2400 incorporates 512 kB Flash memory system. This memory may be used for
both code and data storage. Programming of the Flash memory may be accomplished in
several ways. It may be programmed In System via the serial port (UART0). The
application program may also erase and/or program the Flash while the application is
running, allowing a great degree of flexibility for data storage field and firmware upgrades.
The Flash memory is 128 bits wide and includes pre-fetching and buffering techniques to
allow it to operate at speeds of 72 MHz.
The LPC2400 provides a minimum of 100000 write/erase cycles and 20 years of data
retention.
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Chapter 1: LPC24XX Introductory information
8. On-chip SRAM
The LPC2400 includes a SRAM memory of 64 kB reserved for the ARM processor
exclusive use. This RAM may be used for code and/or data storage and may be accessed
as 8 bits, 16 bits, and 32 bits.
A 16 kB SRAM block serving as a buffer for the Ethernet controller and a 16 kB SRAM
associated with the second AHB bus can be used both for data and code storage, too.
Remaining SRAM such as a 4 kB USB FIFO and a 2 kB RTC SRAM can be used for data
storage only. The RTC SRAM is battery powered and retains the content in the absence of
the main power supply.
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Chapter 1: LPC24XX Introductory information
9. LPC2458 block diagram
XTAL1
V
XTAL2
DD(3V3)
DDA
TMS TDI
trace signals
V
TRST TCK TDO
RESET
EXTIN0 DBGEN
VREF
SYSTEM
FUNCTIONS
LPC2458
PLL
V
V
, V
V
P0, P1, P2,
SSA SSIO, SSCORE
64 kB
SRAM
512 kB
FLASH
TEST/DEBUG
INTERFACE
DD(DCDC)(3V3)
P3, P4
system
clock
INTERNAL RC
OSCILLATOR
HIGH-SPEED
GPI/O
136 PINS
TOTAL
INTERNAL
CONTROLLERS
ARM7TDMI-S
SRAM FLASH
D[15:0]
A[19:0]
EXTERNAL
MEMORY
CONTROLLER
16 kB
SRAM
VIC
control lines
AHB1
AHB2
AHB
BRIDGE
AHB
BRIDGE
V
BUS
USB DEVICE/
HOST/OTG WITH
4 kB RAM AND DMA
16 kB
SRAM
MASTER AHB TO SLAVE
PORT AHB BRIDGE PORT
ETHERNET
MAC WITH
DMA
port 1
port 2
MII/RMII
AHB TO
GP DMA
CONTROLLER
APB BRIDGE
EINT3 to EINT0
P0, P2
I2SRX_CLK
I2STX_CLK
EXTERNAL INTERRUPTS
I2SRX_WS
I2STX_WS
I2SRX_SDA
2
I S INTERFACE
2 × CAP0/CAP1/
CAP2/CAP3
4 × MAT2,
CAPTURE/COMPARE
TIMER0/TIMER1/
TIMER2/TIMER3
I2STX_SDA
2 × MAT3,
SCK, SCK0
2 × MAT1/MAT0
MOSI, MOSI0
MISO, MISO0
SSEL, SSEL0
SPI, SSP0 INTERFACE
SSP1 INTERFACE
6 × PWM0, PWM1
PWM0, PWM1
1 × PCAP0,
2 × PCAP1
SCK1
MOSI1
MISO1
SSEL1
LEGACY GPI/O
64 PINS TOTAL
P0, P1
MCICLK, MCIPWR
SD/MMC CARD
INTERFACE
8 × AD0
A/D CONVERTER
D/A CONVERTER
2 kB BATTERY RAM
MCICMD,
MCIDAT[3:0]
AOUT
TXD0, TXD2, TXD3
RXD0, RXD2, RXD3
UART0, UART2, UART3
UART1
VBAT
TXD1
RXD1
DTR1, RTS1
power domain 2
REAL-
TIME
RTCX1
RTCX2
RTC
OSCILLATOR
DSR1, CTS1, DCD1,
RI1
CLOCK
ALARM
RD1, RD2
TD1, TD2
CAN1, CAN2
WATCHDOG TIMER
SCL0, SCL1, SCL2
SDA0, SDA1, SDA2
2
2
2
I C0, I C1, I C2
SYSTEM CONTROL
002aad093
Fig 1. LPC2458 block diagram
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Chapter 1: LPC24XX Introductory information
10. LPC2420/60 block diagram
XTAL1
V
XTAL2
DD(3V3)
DDA
TMS TDI
TRST TCK TDO
trace signals
V
RESET
EXTIN0 DBGEN
VREF
SYSTEM
FUNCTIONS
LPC2420/2460
PLL
V
V
, V
, V
P0, P1, P2,
P3, P4
SSA SSCORE SSIO
64 kB
SRAM
TEST/DEBUG
INTERFACE
DD(DCDC)(3V3)
system
clock
INTERNAL RC
OSCILLATOR
HIGH-SPEED
GPI/O
160 PINS
TOTAL
INTERNAL
SRAM
CONTROLLER
ARM7TDMI-S
D[31:0]
A[23:0]
EXTERNAL
MEMORY
CONTROLLER
16 kB
SRAM
VIC
control lines
AHB1
AHB2
AHB
BRIDGE
AHB
BRIDGE
V
BUS
USB DEVICE/
HOST/OTG WITH
4 kB RAM AND DMA
16 kB
SRAM
(1)
MASTER AHB TO SLAVE
PORT AHB BRIDGE PORT
ETHERNET
MAC WITH
DMA
port1
port2
MII/RMII
(1)
AHB TO
APB BRIDGE
GP DMA
CONTROLLER
EINT3 to EINT0
P0, P2
I2SRX_CLK
I2STX_CLK
EXTERNAL INTERRUPTS
I2SRX_WS
I2STX_WS
I2SRX_SDA
2
I S INTERFACE
2 × CAP0/CAP1/
CAP2/CAP3
4 × MAT2/MAT3,
2 × MAT0,
CAPTURE/COMPARE
TIMER0/TIMER1/
TIMER2/TIMER3
I2STX_SDA
SCK, SCK0
3 × MAT1
MOSI, MOSI0
MISO, MISO0
SSEL, SSEL0
SPI, SSP0 INTERFACE
SSP1 INTERFACE
6 × PWM0/PWM1
PWM0, PWM1
1 × PCAP0,
2 × PCAP1
SCK1
LEGACY GPI/O
64 PINS TOTAL
MOSI1
MISO1
SSEL1
P0, P1
8 × AD0
A/D CONVERTER
D/A CONVERTER
2 kB BATTERY RAM
MCICLK, MCIPWR
SD/MMC CARD
INTERFACE
MCICMD,
MCIDAT[3:0]
AOUT
TXD0, TXD2, TXD3
RXD0, RXD2, RXD3
UART0, UART2, UART3
UART1
VBAT
TXD1
RXD1
DTR1, RTS1
power domain 2
REAL-
TIME
RTCX1
RTCX2
RTC
OSCILLATOR
DSR1, CTS1, DCD1,
RI1
CLOCK
ALARM
RD1, RD2
TD1, TD2
(1)
(1)
CAN1 , CAN2
WATCHDOG TIMER
SCL0, SCL1, SCL2
SDA0, SDA1, SDA2
2
2
2
I C0, I C1, I C2
SYSTEM CONTROL
002aad313
(1) LPC2460 only.
Fig 2. LPC2460 block diagram
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Chapter 1: LPC24XX Introductory information
11. LPC2468 block diagram
XTAL1
V
XTAL2
DD(3V3)
DDA
TMS TDI
trace signals
V
TRST TCK TDO
RESET
EXTIN0 DBGEN
VREF
SYSTEM
FUNCTIONS
LPC2468
PLL
V
V
, V
V
P0, P1, P2,
SSA SSIO, SSCORE
64 kB
SRAM
512 kB
FLASH
TEST/DEBUG
INTERFACE
DD(DCDC)(3V3)
P3, P4
system
clock
INTERNAL RC
OSCILLATOR
HIGH-SPEED
GPI/O
160 PINS
TOTAL
INTERNAL
CONTROLLERS
ARM7TDMI-S
SRAM FLASH
D[31:0]
A[23:0]
EXTERNAL
MEMORY
CONTROLLER
16 kB
SRAM
VIC
control lines
AHB1
AHB2
AHB
BRIDGE
AHB
BRIDGE
V
BUS
USB DEVICE/
HOST/OTG WITH
4 kB RAM AND DMA
16 kB
SRAM
MASTER AHB TO SLAVE
PORT AHB BRIDGE PORT
ETHERNET
MAC WITH
DMA
port1
port2
MII/RMII
AHB TO
GP DMA
CONTROLLER
APB BRIDGE
EINT3 to EINT0
P0, P2
I2SRX_CLK
I2STX_CLK
EXTERNAL INTERRUPTS
I2SRX_WS
I2STX_WS
I2SRX_SDA
2
I S INTERFACE
2 × CAP0/CAP1/
CAP2/CAP3
4 × MAT2/MAT3,
2 × MAT0,
CAPTURE/COMPARE
TIMER0/TIMER1/
TIMER2/TIMER3
I2STX_SDA
SCK, SCK0
3 × MAT1
MOSI, MOSI0
MISO, MISO0
SSEL, SSEL0
SPI, SSP0 INTERFACE
SSP1 INTERFACE
6 × PWM0/PWM1
PWM0, PWM1
1 × PCAP0,
2 × PCAP1
SCK1
LEGACY GPI/O
64 PINS TOTAL
MOSI1
MISO1
SSEL1
P0, P1
8 × AD0
A/D CONVERTER
D/A CONVERTER
2 kB BATTERY RAM
MCICLK, MCIPWR
SD/MMC CARD
INTERFACE
MCICMD,
MCIDAT[3:0]
AOUT
TXD0, TXD2, TXD3
RXD0, RXD2, RXD3
UART0, UART2, UART3
UART1
VBAT
TXD1
RXD1
DTR1, RTS1
power domain 2
REAL-
TIME
RTCX1
RTCX2
RTC
OSCILLATOR
DSR1, CTS1, DCD1,
RI1
CLOCK
ALARM
RD1, RD2
TD1, TD2
CAN1, CAN2
WATCHDOG TIMER
SCL0, SCL1, SCL2
SDA0, SDA1, SDA2
2
2
2
I C0, I C1, I C2
SYSTEM CONTROL
002aac721
Fig 3. LPC2468 block diagram
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Chapter 1: LPC24XX Introductory information
12. LPC2470 block diagram
XTAL1
V
XTAL2
DD(3V3)
DDA
TMS TDI
trace signals
V
TRST TCK TDO
RESET
EXTIN0 DBGEN
VREF
SYSTEM
FUNCTIONS
LPC2470
PLL
V
V
, V
, V
P0, P1, P2,
64 kB
SSA SSCORE SSIO
TEST/DEBUG
INTERFACE
DD(DCDC)(3V3)
P3, P4
SRAM
system
clock
INTERNAL RC
OSCILLATOR
HIGH-SPEED
GPI/O
160 PINS
TOTAL
INTERNAL
SRAM
CONTROLLER
ARM7TDMI-S
D[31:0]
A[23:0]
EXTERNAL
MEMORY
CONTROLLER
16 kB
SRAM
VIC
control lines
AHB1
AHB2
AHB
BRIDGE
AHB
BRIDGE
V
BUS
USB DEVICE/
HOST/OTG WITH
4 kB RAM AND DMA
16 kB
SRAM
MASTER AHB TO SLAVE
PORT AHB BRIDGE PORT
ETHERNET
MAC WITH
DMA
port1
port2
MII/RMII
AHB TO
GP DMA
CONTROLLER
APB BRIDGE
8 × LCD control
LCDVD[23:0]
LCDCLKIN
EINT3 to EINT0
P0, P2
LCD INTERFACE
WITH DMA
EXTERNAL INTERRUPTS
2 × CAP0/CAP1/
CAP2/CAP3
4 × MAT2/MAT3,
2 × MAT0,
CAPTURE/COMPARE
TIMER0/TIMER1/
TIMER2/TIMER3
3 × I2SRX
3 × I2STX
2
I S INTERFACE
3 × MAT1
6 × PWM0/PWM1
SCK, SCK0
PWM0, PWM1
1 × PCAP0,
2 × PCAP1
MOSI, MOSI0
MISO, MISO0
SSEL, SSEL0
SPI, SSP0 INTERFACE
SSP1 INTERFACE
LEGACY GPI/O
64 PINS TOTAL
P0, P1
SCK1
MOSI1
MISO1
SSEL1
8 × AD0
A/D CONVERTER
D/A CONVERTER
2 kB BATTERY RAM
MCICLK, MCIPWR
SD/MMC CARD
INTERFACE
AOUT
MCICMD,
MCIDAT[3:0]
VBAT
TXD0, TXD2, TXD3
RXD0, RXD2, RXD3
UART0, UART2, UART3
UART1
power domain 2
REAL-
RTCX1
RTCX2
RTC
TXD1, DTR1, RTS1
RXD1, DSR1, CTS1,
DCD1, RI1
TIME
CLOCK
OSCILLATOR
ALARM
RD1, RD2
TD1, TD2
CAN1, CAN2
WATCHDOG TIMER
SCL0, SCL1, SCL2
SDA0, SDA1, SDA2
2
2
2
I C0, I C1, I C2
SYSTEM CONTROL
002aad317
Fig 4. LPC2470 block diagram
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Chapter 1: LPC24XX Introductory information
13. LPC2478 block diagram
XTAL1
V
XTAL2
DD(3V3)
DDA
TMS TDI
trace signals
V
TRST TCK TDO
RESET
EXTIN0 DBGEN
VREF
SYSTEM
FUNCTIONS
LPC2478
PLL
V
V
, V
V
P0, P1, P2,
SSA SSIO, SSCORE
64 kB
SRAM
512 kB
FLASH
TEST/DEBUG
INTERFACE
DD(DCDC)(3V3)
P3, P4
system
clock
INTERNAL RC
OSCILLATOR
HIGH-SPEED
GPI/O
160 PINS
TOTAL
INTERNAL
CONTROLLERS
ARM7TDMI-S
SRAM FLASH
D[31:0]
A[23:0]
EXTERNAL
MEMORY
CONTROLLER
16 kB
SRAM
VIC
control lines
AHB1
AHB2
AHB
BRIDGE
AHB
BRIDGE
V
BUS
USB DEVICE/
HOST/OTG WITH
4 kB RAM AND DMA
16 kB
SRAM
MASTER AHB TO SLAVE
PORT AHB BRIDGE PORT
ETHERNET
MAC WITH
DMA
port1
port2
MII/RMII
AHB TO
GP DMA
CONTROLLER
APB BRIDGE
8 × LCD control
LCDVD[23:0]
LCDCLKIN
EINT3 to EINT0
P0, P2
LCD INTERFACE
WITH DMA
EXTERNAL INTERRUPTS
2 × CAP0/CAP1/
CAP2/CAP3
4 × MAT2/MAT3,
2 × MAT0,
CAPTURE/COMPARE
TIMER0/TIMER1/
TIMER2/TIMER3
3 × I2SRX
3 × I2STX
2
I S INTERFACE
3 × MAT1
6 × PWM0/PWM1
SCK0, SCK
PWM0, PWM1
1 × PCAP0,
2 × PCAP1
MOSI0, MOSI
MISO0, MISO
SSEL0, SSEL
SSP0/SPI INTERFACE
SSP1 INTERFACE
LEGACY GPI/O
64 PINS TOTAL
P0, P1
SCK1
MOSI1
MISO1
SSEL1
8 × AD0
A/D CONVERTER
D/A CONVERTER
2 kB BATTERY RAM
MCICLK, MCIPWR
SD/MMC CARD
INTERFACE
AOUT
MCICMD,
MCIDAT[3:0]
VBAT
TXD0, TXD2, TXD3
RXD0, RXD2, RXD3
UART0, UART2, UART3
UART1
power domain 2
REAL-
RTCX1
RTCX2
RTC
TXD1, DTR1, RTS1
RXD1, DSR1, CTS1,
DCD1, RI1
TIME
CLOCK
OSCILLATOR
ALARM
RD1, RD2
TD1, TD2
CAN1, CAN2
WATCHDOG TIMER
SCL0, SCL1, SCL2
SDA0, SDA1, SDA2
2
2
2
I C0, I C1, I C2
SYSTEM CONTROL
002aac805
Fig 5. LPC2478 block diagram
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Chapter 2: LPC24XX Memory mapping
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1. How to read this chapter
The memory addressing and mapping for different LPC2400 parts depends on flash size,
Table 13. LPC2400 memory options and addressing
Flash
LCD
EMC
Memory map
LPC2458
LPC2420
LPC2460
LPC2468
LPC2470
LPC2478
512 kB
no
16-bit
32-bit
32-bit
32-bit
32-bit
32-bit
flashless
flashless
512 kB
no
no
no
flashless
512 kB
yes
yes
2. Memory map and peripheral addressing
ARM processors have a single 4 GB address space. The following table shows how this
space is used on NXP embedded ARM devices.
Table 14. LPC2458 memory usage and details
Address range
General use
Address range details and description
0x0000 0000 - 0x0007 FFFF
0x0000 0000 to
0x3FFF FFFF
On-chip non-volatile
memory and Fast I/O
Flash Memory (512 kB)
Fast GPIO registers
RAM (64 kB)
0x3FFF C000 - 0x3FFF FFFF
0x4000 0000 - 0x4000 FFFF
0x4000 0000 to
0x7FFF FFFF
On-chip RAM
0x7FE0 0000 - 0x7FE0 3FFF
Ethernet RAM (16 kB)
USB RAM (16 kB)
0x7FD0 0000 - 0x7FD0 3FFF
Two static memory banks, 16 MB each
0x8000 0000 - 0x80FF FFFF
0x8000 0000 to
0xDFFF FFFF
Off-Chip Memory
Static memory bank 0
Static memory bank 1
0x8100 0000 - 0x81FF FFFF
Two dynamic memory banks, 256 MB each
0xA000 0000 - 0xAFFF FFFF
0xB000 0000 - 0xBFFF FFFF
36 peripheral blocks, 16 kB each
Dynamic memory bank 0
Dynamic memory bank 1
0xE000 0000 to
0xEFFF FFFF
APB Peripherals
AHB peripherals
0xF000 0000 to
0xFFFF FFFF
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Chapter 2: LPC24XX Memory mapping
Table 15. LPC2420/60/70 memory usage and details
Address range
General use
Address range details and description
0x0000 0000 to
0x3FFF FFFF
Fast I/O
0x0000 0000 - 0x0007 FFFF
0x3FFF C000 - 0x3FFF FFFF
0x4000 0000 - 0x4000 FFFF
0x7FE0 0000 - 0x7FE0 3FFF
Reserved (flashless parts)
Fast GPIO registers
RAM (64 kB)
0x4000 0000 to
0x7FFF FFFF
On-chip RAM
Ethernet RAM (16 kB) (LPC2460
only)
0x7FD0 0000 - 0x7FD0 3FFF
Four static memory banks, 16 MB each
0x8000 0000 - 0x80FF FFFF
0x8100 0000 - 0x81FF FFFF
0x8200 0000 - 0x82FF FFFF
0x8300 0000 - 0x83FF FFFF
USB RAM (16 kB)
0x8000 0000 to
0xDFFF FFFF
Off-Chip Memory
Static memory bank 0
Static memory bank 1
Static memory bank 2
Static memory bank 3
Four dynamic memory banks, 256 MB each
0xA000 0000 - 0xAFFF FFFF
Dynamic memory bank 0
Dynamic memory bank 1
Dynamic memory bank 2
Dynamic memory bank 3
0xB000 0000 - 0xBFFF FFFF
0xC000 0000 - 0xCFFF FFFF
0xD000 0000 - 0xDFFF FFFF
36 peripheral blocks, 16 kB each
0xE000 0000 to
0xEFFF FFFF
APB Peripherals
AHB peripherals
0xF000 0000 to
0xFFFF FFFF
Table 16. LPC2468/78 memory usage and details
Address range
General use
Address range details and description
0x0000 0000 - 0x0007 FFFF
0x3FFF C000 - 0x3FFF FFFF
0x4000 0000 - 0x4000 FFFF
0x7FE0 0000 - 0x7FE0 3FFF
0x7FD0 0000 - 0x7FD0 3FFF
0x0000 0000 to
0x3FFF FFFF
On-chip non-volatile
memory and Fast I/O
Flash Memory (512 kB)
Fast GPIO registers
RAM (64 kB)
0x4000 0000 to
0x7FFF FFFF
On-chip RAM
Ethernet RAM (16 kB)
USB RAM (16 kB)
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Chapter 2: LPC24XX Memory mapping
Table 16. LPC2468/78 memory usage and details
Address range
General use
Address range details and description
0x8000 0000 to
0xDFFF FFFF
Off-Chip Memory
Four static memory banks, 16 MB each
0x8000 0000 - 0x80FF FFFF
0x8100 0000 - 0x81FF FFFF
0x8200 0000 - 0x82FF FFFF
0x8300 0000 - 0x83FF FFFF
Static memory bank 0
Static memory bank 1
Static memory bank 2
Static memory bank 3
Four dynamic memory banks, 256 MB each
0xA000 0000 - 0xAFFF FFFF
0xB000 0000 - 0xBFFF FFFF
0xC000 0000 - 0xCFFF FFFF
0xD000 0000 - 0xDFFF FFFF
36 peripheral blocks, 16 kB each
Dynamic memory bank 0
Dynamic memory bank 1
Dynamic memory bank 2
Dynamic memory bank 3
0xE000 0000 to
0xEFFF FFFF
APB Peripherals
AHB peripherals
0xF000 0000 to
0xFFFF FFFF
3. Memory maps
The LPC2400 incorporates several distinct memory regions, shown in the following
program viewpoint following reset. The interrupt vector area supports address remapping,
which is described later in this section.
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Chapter 2: LPC24XX Memory mapping
4.0 GB
0xFFFF FFFF
AHB PERIPHERALS
3.75 GB
0xF000 0000
0xE000 0000
APB PERIPHERALS
3.5 GB
EXTERNAL STATIC AND DYNAMIC MEMORY
2.0 GB
0x8000 0000
0x7FFF FFFF
BOOT ROM AND BOOT FLASH
RESERVED ADDRESS SPACE
ON-CHIP STATIC RAM
SPECIAL REGISTERS
1.0 GB
0x4000 0000
0x3FFF FFFF
0x3FFF 8000
RESERVED ADDRESS SPACE
ON-CHIP NON-VOLATILE MEMORY OR RESERVED
0.0 GB
0x0000 0000
Fig 6. LPC2400 system memory map
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Chapter 2: LPC24XX Memory mapping
4.0 GB
0xFFFF FFFF
AHB PERIPHERALS
0xFFE0 0000
0xFFDF FFFF
4.0 GB - 2 MB
RESERVED
0xF000 0000
0xEFFF FFFF
3.75 GB
RESERVED
0xE020 0000
0xE01F FFFF
3.5 GB + 2 MB
3.5 GB
APB PERIPHERALS
0xE000 0000
Fig 7. Peripheral memory map
AHB and APB peripheral areas are 2 megabyte spaces which are divided up into 128
peripherals. Each peripheral space is 16 kilobytes in size. This allows simplifying the
address decoding for each peripheral.
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Chapter 2: LPC24XX Memory mapping
All peripheral register addresses are word aligned (to 32 bit boundaries) regardless of
their size. This eliminates the need for byte lane mapping hardware that would be required
to allow byte (8 bit) or half-word (16 bit) accesses to occur at smaller boundaries. An
implication of this is that word and half-word registers must be accessed all at once. For
example, it is not possible to read or write the upper byte of a word register separately.
VECTORED INTERRUPT CONTROLLER
0xFFFF F000 (4G - 4K)
0xFFFF C000
(AHB PERIPHERAL #126)
0xFFFF 8000
0xFFE1 8000
NOT USED
(AHB PERIPHERAL #5)
0xFFE1 4000
LCD(1)
(AHB PERIPHERAL #4)
0xFFE1 0000
USB CONTROLLER
(AHB PERIPHERAL #3)
0xFFE0 C000
EXTERNAL MEMORY CONTROLLER
(AHB PERIPHERAL #2)
0xFFE0 8000
GENERAL PURPOSE DMA CONTROLLER
(AHB PERIPHERAL #1)
0xFFE0 4000
ETHERNET CONTROLLER
(AHB PERIPHERAL #0)
0xFFE0 0000
(1) LPC247x only.
Fig 8. AHB peripheral map
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Chapter 2: LPC24XX Memory mapping
4. APB peripheral addresses
The following table shows the APB address map. No APB peripheral uses all of the 16 kB
space allocated to it. Typically each device’s registers are "aliased" or repeated at multiple
locations within each 16 kB range.
Table 17. APB peripherals and base addresses
APB Peripheral
Base Address
0xE000 0000
0xE000 4000
0xE000 8000
0xE000 C000
0xE001 0000
0xE001 4000
0xE001 8000
0xE001 C000
0xE002 0000
0xE002 4000
0xE002 8000
0xE002 C000
0xE003 0000
0xE003 4000
0xE003 8000
0xE003 C000
0xE004 0000
0xE004 4000
0xE004 8000
0xE004 C000 to 0xE005 8000
0xE005 C000
0xE006 0000
0xE006 4000
0xE006 8000
0xE006 C000
0xE007 0000
0xE007 4000
0xE007 8000
0xE007 C000
0xE008 0000
0xE008 4000
0xE008 8000
0xE008 C000
0xE009 0000 to 0xE01F BFFF
0xE01F C000
Peripheral Name
0
Watchdog Timer
1
Timer 0
2
Timer 1
3
UART0
4
UART1
5
PWM0
6
PWM1
I2C0
7
8
SPI
9
RTC
10
11
GPIO
Pin Connect Block
12
13
14
15
16
17
18
19 to 22
23
24
25
26
27
28
29
30
31
32
33
34
35
36 to 126
127
SSP1
ADC
CAN Acceptance Filter RAM
CAN Acceptance Filter Registers
CAN Common Registers
CAN Controller 1
CAN Controller 2
Not used
I2C1
Not used
Not used
SSP0
DAC
Timer 2
Timer 3
UART2
UART3
I2C2
Battery RAM
I2S
SD/MMC Card Interface
Not used
System Control Block
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Chapter 2: LPC24XX Memory mapping
5. LPC2400 memory re-mapping and boot ROM
5.1 Memory map concepts and operating modes
The basic concept on the LPC2400 is that each memory area has a "natural" location in
the memory map. This is the address range for which code residing in that area is written.
The bulk of each memory space remains permanently fixed in the same location,
eliminating the need to have portions of the code designed to run in different address
ranges.
Because of the location of the interrupt vectors on the ARM7 processor (at addresses
Boot ROM and SRAM spaces need to be re-mapped in order to allow alternative uses of
interrupts is accomplished via the Memory Mapping Control feature (Section 2–6 “Memory
Table 18. ARM exception vector locations
Address
Exception
0x0000 0000
0x0000 0004
0x0000 0008
0x0000 000C
0x0000 0010
0x0000 0014
Reset
Undefined Instruction
Software Interrupt
Prefetch Abort (instruction fetch memory fault)
Data Abort (data access memory fault)
Reserved
Note: Identified as reserved in ARM documentation, this location is used
by the Boot Loader as the Valid User Program key when booting from
0x0000 0018
0x0000 001C
IRQ
FIQ
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Chapter 2: LPC24XX Memory mapping
Table 19. LPC2400 Memory mapping modes
Mode
Activation
Usage
Boot
Hardware
The Boot Loader always executes after any reset. The Boot ROM
Loader
mode
activation by interrupt vectors are mapped to the bottom of memory to allow
any Reset
handling exceptions and using interrupts during the Boot Loading
process. A sector of the flash memory (the Boot flash) is available to
hold part of the Boot Code.
User
Software
For LPC2400 parts with flash only. Activated by the Boot Loader when
Flash
mode
activation by a valid User Program Signature is recognized in memory and Boot
Boot code
Loader operation is not forced. Interrupt vectors are not re-mapped
and are found in the bottom of the flash memory.
UserRAM Software
Activated by a User Program as desired. Interrupt vectors are
mode
activation by re-mapped to the bottom of the Static RAM.
User program
User
Software
For LPC2400 parts with flash. Interrupt vectors are re-mapped to
External
memory
mode
user code
Software
For flashless parts LPC2420/60/70 only. Interrupt vectors are
boot code
[2] Connect external boot memory to chip select 1. During boot from external memory, the address mirror bit is
set and memory bank addresses 0 and 1 are swapped.
5.2 Memory re-mapping
In order to allow for compatibility with future derivatives, the entire Boot ROM is mapped
to the top of the on-chip memory space. In this manner, the use of larger or smaller flash
modules will not require changing the location of the Boot ROM (which would require
changing the Boot Loader code itself) or changing the mapping of the Boot ROM interrupt
vectors. Memory spaces other than the interrupt vectors remain in fixed locations.
Figure 2–9 shows the on-chip memory mapping in the modes defined above.
The portion of memory that is re-mapped to allow interrupt processing in different modes
includes the interrupt vector area (32 bytes) and an additional 32 bytes for a total of
64 bytes, that facilitates branching to interrupt handlers at distant physical addresses. The
remapped code locations overlay addresses 0x0000 0000 through 0x0000 003F. A typical
user program in the flash memory can place the entire FIQ handler at address
0x0000 001C without any need to consider memory boundaries. The vector contained in
the SRAM, external memory, and Boot ROM must contain branches to the actual interrupt
handlers, or to other instructions that accomplish the branch to the interrupt handlers.
There are three reasons this configuration was chosen:
1. To give the FIQ handler in the flash memory the advantage of not having to take a
memory boundary caused by the remapping into account.
2. Minimize the need to for the SRAM and Boot ROM vectors to deal with arbitrary
boundaries in the middle of code space.
3. To provide space to store constants for jumping beyond the range of single word
branch instructions.
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Chapter 2: LPC24XX Memory mapping
Re-mapped memory areas, including the Boot ROM and interrupt vectors, continue to
appear in their original location in addition to the re-mapped address.
Details on re-mapping and examples can be found in Section 2–6 “Memory mapping
6. Memory mapping control
The Memory Mapping Control alters the mapping of the interrupt vectors that appear
beginning at address 0x0000 0000. This allows code running in different memory spaces
to have control of the interrupts.
6.1 Memory Mapping Control Register (MEMMAP - 0xE01F C040)
Whenever an exception handling is necessary, the microcontroller will fetch an instruction
vector locations” on page 23. The MEMMAP register determines the source of data that
will fill this table.
Table 20. Memory mapping control registers
Name
Description
Access Reset Address
value
MEMMAP Memory mapping control. Selects whether the
ARM interrupt vectors are read from the Boot
ROM, User Flash, or RAM.
R/W
0x00 0xE01F C040
Table 21. Memory Mapping control register (MEMMAP - address 0xE01F C040) bit
description
Bit Symbol Value Description
Reset
value
1:0 MAP
00
01
Boot Loader Mode. Interrupt vectors are re-mapped to Boot ROM. 00
User Flash Mode. Interrupt vectors are not re-mapped and reside
in Flash.
Remark: This mode is for parts with flash only. Value 01 is
reserved for flashless parts LPC2420/60/70.
10
11
User RAM Mode. Interrupt vectors are re-mapped to Static RAM.
User External Memory Mode. Interrupt vectors are re-mapped to
external memory bank 0.
Warning: Improper setting of this value may result in incorrect operation of
the device.
7:2
-
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
6.2 Memory mapping control usage notes
Memory Mapping Control simply selects one out of three available sources of data (sets of
64 bytes each) necessary for handling ARM exceptions (interrupts).
For example, whenever a Software Interrupt request is generated, ARM core will always
locations” on page 23. This means that when MEMMAP[1:0] = 10 (User RAM Mode),
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Chapter 2: LPC24XX Memory mapping
read/fetch from 0x0000 0008 will provide data stored in 0x4000 0008. In case of
MEMMAP[1:0] = 00 (Boot Loader Mode), read/fetch from 0x0000 0008 will provide data
available also at 0x7FFF E008 (Boot ROM remapped from on-chip Bootloader).
EXTERNAL MEMORY INTERRUPT VECTORS
8 kB BOOT ROM
2.0 GB
0x8000 0000
0x7FFF FFFF
(BOOT ROM INTERRUPT VECTORS)
2.0 GB - 8 kB
2.0 GB - 64 kB
0x7FFF E000
0x7FFE FFFF
8 kB BOOT FLASH
(RE-MAPPED FROM TOP OF FLASH MEMORY)
2.0 GB - 72 kB
0x7FFE E000
RESERVED ADDRESS SPACE
0x4001 0000
0x4000 FFFF
64 kB STATIC RAM
(SRAM INTERRUPT VECTORS)
FAST GPIO REGISTERS
0x4000 0000
0x3FFF FFFF
1.0 GB
0x3FFF C000
0x3FFF BFFF
PARTCFG REGISTERS
0x3FFF 8000
RESERVED FOR ADDRESS SPACE
0x0008 0000
0x0007 FFFF
BOOT FLASH
512 kB FLASH MEMORY
ACTIVE INTERRUPT VECTORS
0.0 GB
(FROM FLASH, SRAM, BOOT ROM, OR EXT MEMORY)
0x0000 0000
Fig 9. Map of lower memory is showing re-mapped and re-mappable areas for a
LPC2400 part with flash
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Chapter 2: LPC24XX Memory mapping
7. Prefetch abort and data abort exceptions
The LPC2400 generates the appropriate bus cycle abort exception if an access is
attempted for an address that is in a reserved or unassigned address region. The regions
are:
• Areas of the memory map that are not implemented for a specific ARM derivative. For
the LPC2400, these are:
– Address space between On-Chip Non-Volatile Memory and the Special Register
– Address space between On-Chip Static RAM and the Boot ROM. Labelled
– External Memory
For these areas, both attempted data access and instruction fetch generate an exception.
In addition, a Prefetch Abort exception is generated for any instruction fetch that maps to
an AHB or APB peripheral address, or to the Special Register space located just below
the SRAM at addresses 0x3FFF8000 through 0x3FFFFFFF.
Within the address space of an existing APB peripheral, a data abort exception is not
generated in response to an access to an undefined address. Address decoding within
each peripheral is limited to that needed to distinguish defined registers within the
peripheral itself. For example, an access to address 0xE000 D000 (an undefined address
within the UART0 space) may result in an access to the register defined at address
0xE000 C000. Details of such address aliasing within a peripheral space are not defined
in the LPC2400 documentation and are not a supported feature.
If software executes a write directly to the flash memory, the MAM generates a data abort
exception. Flash programming must be accomplished by using the specified flash
programming interface provided by the Boot Code.
Note that the ARM core stores the Prefetch Abort flag along with the associated
instruction (which will be meaningless) in the pipeline and processes the abort only if an
attempt is made to execute the instruction fetched from the illegal address. This prevents
accidental aborts that could be caused by prefetches that occur when code is executed
very near a memory boundary.
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1. Summary of system control block functions
The System Control Block includes several system features and control registers for a
number of functions that are not related to specific peripheral devices. These include:
• Reset
• Brown-Out Detection
• External Interrupt Inputs
• Miscellaneous System Controls and Status
• Code Security vs. Debugging
Each type of function has its own register(s) if any are required and unneeded bits are
defined as reserved in order to allow future expansion. Unrelated functions never share
the same register addresses
2. Pin description
Table 22. Pin summary
Pin name
Pin
Pin description
direction
EINT0
Input
External Interrupt Input 0 - An active low/high level or
falling/rising edge general purpose interrupt input. This pin may be
used to wake up the processor from Idle or Power down modes.
EINT1
EINT2
EINT3
RESET
Input
Input
Input
Input
External Interrupt Input 1 - See the EINT0 description above.
External Interrupt Input 2 - See the EINT0 description above.
External Interrupt Input 3 - See the EINT0 description above.
External Reset input - A LOW on this pin resets the chip, causing
I/O ports and peripherals to take on their default states, and the
processor to begin execution at address 0x0000 0000.
3. Register description
All registers, regardless of size, are on word address boundaries. Details of the registers
appear in the description of each function.
Table 23. Summary of system control registers
Name
Description
External interrupts
EXTINT
External Interrupt Flag Register
External Interrupt Mode register
R/W
R/W
0x00
0x00
0x00
0xE01F C140
0xE01F C148
0xE01F C14C
EXTMODE
EXTPOLAR
External Interrupt Polarity Register R/W
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Chapter 3: LPC24XX System control
Table 23. Summary of system control registers
Name
Reset
RSID
Description
Access Reset value[1] Address
Reset Source Identification
Register
R/W
R/W
see text
0x00
0xE01F C180
0xE01F C1A0
Syscon miscellaneous registers
SCS
System Control and Status
AHB priority scheduling registers
AHBCFG1
AHBCFG2
Configures the AHB1 arbiter
Configures the AHB2 arbiter
R/W
R/W
0x0000 0145
0x0000 0145
0xE01F C188
0xE01F C18C
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
3.1 External interrupt inputs
The LPC2400 includes four External Interrupt Inputs as selectable pin functions. In
addition, external interrupts have the ability to wake up the CPU from Power down mode.
This is controlled by the register INTWAKE, which is described in the Clocking and Power
Control chapter under the Power Control heading
3.1.1 Register description
The external interrupt function has four registers associated with it. The EXTINT register
contains the interrupt flags. The EXTMODE and EXTPOLAR registers specify the level
and edge sensitivity parameters.
Table 24. External Interrupt registers
Name
Description
Access Reset
value[1]
Address
EXTINT
The External Interrupt Flag Register contains
interrupt flags for EINT0, EINT1, EINT2 and
R/W
0x00
0x00
0x00
0xE01F C140
EXTMODE The External Interrupt Mode Register controls R/W
whether each pin is edge- or level-sensitive.
0xE01F C148
0xE01F C14C
EXTPOLAR The External Interrupt Polarity Register controls R/W
which level or edge on each pin will cause an
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
3.1.2 External Interrupt flag register (EXTINT - 0xE01F C140)
When a pin is selected for its external interrupt function, the level or edge on that pin
(selected by its bits in the EXTPOLAR and EXTMODE registers) will set its interrupt flag in
this register. This asserts the corresponding interrupt request to the VIC, which will cause
an interrupt if interrupts from the pin are enabled.
Writing ones to bits EINT0 through EINT3 in EXTINT register clears the corresponding
bits. In level-sensitive mode the interrupt is cleared only when the pin is in its inactive
state.
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Once a bit from EINT0 to EINT3 is set and an appropriate code starts to execute (handling
wakeup and/or external interrupt), this bit in EXTINT register must be cleared. Otherwise
event that was just triggered by activity on the EINT pin will not be recognized in future.
Important: whenever a change of external interrupt operating mode (i.e. active
level/edge) is performed (including the initialization of an external interrupt),
corresponding bit in the EXTINT register must be cleared! For details see Section
For example, if a system wakes up from power-down using low level on external interrupt
0 pin, its post-wakeup code must reset EINT0 bit in order to allow future entry into the
power-down mode. If EINT0 bit is left set to 1, subsequent attempt(s) to invoke
power-down mode will fail. The same goes for external interrupt handling.
More details on power-down mode will be discussed in the following chapters.
Table 25. External Interrupt Flag register (EXTINT - address 0xE01F C140) bit description
Bit Symbol Description
Reset
value
0
EINT0
EINT1
EINT2
EINT3
-
In level-sensitive mode, this bit is set if the EINT0 function is selected for its
pin, and the pin is in its active state. In edge-sensitive mode, this bit is set if
the EINT0 function is selected for its pin, and the selected edge occurs on
the pin.
0
0
0
0
This bit is cleared by writing a one to it, except in level sensitive mode when
the pin is in its active state.[1]
1
In level-sensitive mode, this bit is set if the EINT1 function is selected for its
pin, and the pin is in its active state. In edge-sensitive mode, this bit is set if
the EINT1 function is selected for its pin, and the selected edge occurs on
the pin.
This bit is cleared by writing a one to it, except in level sensitive mode when
the pin is in its active state.[1]
2
In level-sensitive mode, this bit is set if the EINT2 function is selected for its
pin, and the pin is in its active state. In edge-sensitive mode, this bit is set if
the EINT2 function is selected for its pin, and the selected edge occurs on
the pin.
This bit is cleared by writing a one to it, except in level sensitive mode when
the pin is in its active state.[1]
3
In level-sensitive mode, this bit is set if the EINT3 function is selected for its
pin, and the pin is in its active state. In edge-sensitive mode, this bit is set if
the EINT3 function is selected for its pin, and the selected edge occurs on
the pin.
This bit is cleared by writing a one to it, except in level sensitive mode when
the pin is in its active state.[1]
7:4
Reserved, user software should not write ones to reserved bits. The value NA
read from a reserved bit is not defined.
[1] Example: If the EINTx is selected to be low level sensitive and low level is present on corresponding pin,
this bit can not be cleared; this bit can be cleared only when signal on the pin becomes high.
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3.1.3 External Interrupt Mode register (EXTMODE - 0xE01F C148)
The bits in this register select whether each EINT pin is level- or edge-sensitive. Only pins
VICIntEnable register (Section 7–3.4 “Interrupt Enable Register (VICIntEnable -
0xFFFF F010)”) can cause interrupts from the External Interrupt function (though of
course pins selected for other functions may cause interrupts from those functions).
Note: Software should only change a bit in this register when its interrupt is
disabled in VICIntEnable, and should write the corresponding 1 to EXTINT before
enabling (initializing) or re-enabling the interrupt. An extraneous interrupt(s) could
be set by changing the mode and not having the EXTINT cleared.
Table 26. External Interrupt Mode register (EXTMODE - address 0xE01F C148) bit
description
Bit Symbol
Value Description
Reset
value
0
EXTMODE0 0 Level-sensitivity is selected for EINT0.
0
1
EINT0 is edge sensitive.
1
EXTMODE1 0
Level-sensitivity is selected for EINT1.
EINT1 is edge sensitive.
0
1
2
EXTMODE2 0
Level-sensitivity is selected for EINT2.
EINT2 is edge sensitive.
0
1
EXTMODE3 0
1
3
Level-sensitivity is selected for EINT3.
EINT3 is edge sensitive.
0
7:4
-
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
3.1.4 External Interrupt Polarity register (EXTPOLAR - 0xE01F C14C)
In level-sensitive mode, the bits in this register select whether the corresponding pin is
high- or low-active. In edge-sensitive mode, they select whether the pin is rising- or
falling-edge sensitive. Only pins that are selected for the EINT function (see
Register (VICIntEnable - 0xFFFF F010)”) can cause interrupts from the External Interrupt
function (though of course pins selected for other functions may cause interrupts from
those functions).
Note: Software should only change a bit in this register when its interrupt is
disabled in VICIntEnable, and should write the corresponding 1 to EXTINT before
enabling (initializing) or re-enabling the interrupt. An extraneous interrupt(s) could
be set by changing the polarity and not having the EXTINT cleared.
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Table 27. External Interrupt Polarity register (EXTPOLAR - address 0xE01F C14C) bit
description
Bit Symbol
Value Description
Reset
value
0
1
2
3
EXTPOLAR0
0
1
0
1
0
1
0
1
-
EINT0 is low-active or falling-edge sensitive (depending on
EXTMODE0).
0
EINT0 is high-active or rising-edge sensitive (depending on
EXTMODE0).
EXTPOLAR1
EXTPOLAR2
EXTPOLAR3
EINT1 is low-active or falling-edge sensitive (depending on
EXTMODE1).
0
EINT1 is high-active or rising-edge sensitive (depending on
EXTMODE1).
EINT2 is low-active or falling-edge sensitive (depending on
EXTMODE2).
0
EINT2 is high-active or rising-edge sensitive (depending on
EXTMODE2).
EINT3 is low-active or falling-edge sensitive (depending on
EXTMODE3).
0
EINT3 is high-active or rising-edge sensitive (depending on
EXTMODE3).
7:4 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
3.2 Reset
Reset has four sources on the LPC2400: the RESET pin, the Watchdog Reset, Power On
Reset (POR) and the Brown Out Detection circuit (BOD). The RESET pin is a Schmitt
trigger input pin. Assertion of chip Reset by any source, once the operating voltage attains
this chapter), causing reset to remain asserted until the external Reset is de-asserted, the
oscillator is running, a fixed number of clocks have passed, and the flash controller has
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Chapter 3: LPC24XX System control
Reset to the
on-chip circuitry
external
reset
C
S
Q
watchdog
reset
Reset to
PCON.PD
POR
BOD
WAKEUP TIMER
START
power
down
COUNT 2n
C
Q
internal RC
oscillator
EINT0 wakeup
EINT1 wakeup
S
write “1”
from APB
EINT2 wakeup
EINT3 wakeup
RTC wakeup
reset
BOD wakeup
Ethernet MAC wakeup
APB read of
PDBIT
in PCON
USB need_clk wakeup
CAN wakeup
GPIO0 port wakeup
GPIO2 port wakeup
FOSC
to other
blocks
Fig 10. Reset block diagram including the wakeup timer
On the assertion of any of reset sources (POR, BOD reset, External reset and Watchdog
reset), the following two sequences start simultaneously:
1. After IRC-start-up time (maximum of 60 μs on power-up), IRC provides stable clock
output, the reset signal is latched and synchronized on the IRC clock. The 2-bit IRC
wakeup timer starts counting when the synchronized reset is de-asserted. The boot
code in the ROM starts when the 2-bit IRC wakeup timer times out. The boot code
performs the boot tasks and may jump to the flash. If the flash is not ready to access,
the MAM will insert wait cycles until the flash is ready.
2. After IRC-start-up time (maximum of 60 μs on power-up), IRC provides stable clock
output, the reset signal is synchronized on the IRC clock. The flash wakeup-timer
(9-bit) starts counting when the synchronized reset is de-asserted. The flash
wakeup-timer generates the 100 μs flash start-up time. Once it times out, the flash
initialization sequence is started, which takes about 250 cycles. When it’s done, the
MAM will be granted access to the flash.
When the internal Reset is removed, the processor begins executing at address 0, which
is initially the Reset vector mapped from the Boot Block. At that point, all of the processor
and peripheral registers have been initialized to predetermined values.
Figure 3–11 shows an example of the relationship between the RESET, the IRC, and the
processor status when the LPC2400 starts up after reset. For the start-up sequence of the
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IRC
IRC
starts
stable
IRC status
RESET
V
DD(3V3)
valid threshold
GND
30 μs
1 μs; IRC stability count
boot time
170 μs
user code
supply ramp-up
time
8 μs
160 μs
processor status
boot code
execution
finishes;
flash read
starts
flash read
finishes
user code starts
002aad482
Fig 11. Example of start-up after reset
The various Resets have some small differences. For example, a Power On Reset causes
the value of certain pins to be latched to configure the part.
For more details on Reset, PLL and startup/boot code interaction see Section 4–3.2.2
3.2.1 Reset Source Identification Register (RSIR - 0xE01F C180)
This register contains one bit for each source of Reset. Writing a 1 to any of these bits
clears the corresponding read-side bit to 0. The interactions among the four sources are
described below.
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Table 28. Reset Source Identification register (RSID - address 0xE01F C180) bit description
Bit Symbol Description
Reset
value
0
POR
Assertion of the POR signal sets this bit, and clears all of the other bits in See text
this register. But if another Reset signal (e.g., External Reset) remains
asserted after the POR signal is negated, then its bit is set. This bit is not
affected by any of the other sources of Reset.
1
2
EXTR
Assertion of the RESET signal sets this bit. This bit is cleared by POR, See text
but is not affected by WDT or BOD reset.
WDTR This bit is set when the Watchdog Timer times out and the WDTRESET See text
bit in the Watchdog Mode Register is 1. It is cleared by any of the other
sources of Reset.
3
BODR This bit is set when the 3.3 V power reaches a level below 2.6 V.
See text
If the VDD voltage dips from 3.3 V to 2.5 V and backs up, the BODR bit
will be set to 1.
If the VDD(3V3) voltage dips from 3.3 V to 2.5 V and continues to decline
to the level at which POR is asserted (nominally 1 V), the BODR bit is
cleared.
if the VDD(3V3) voltage rises continuously from below 1 V to a level above
2.6 V, the BODR will be set to 1.
This bit is not affected by External Reset nor Watchdog Reset.
Note: Only in case when a reset occurs and the POR = 0, the BODR bit
indicates if the VDD(3V3) voltage was below 2.6 V or not.
7:4
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
3.3 Other system controls and status flags
Some aspects of controlling LPC2400 operation that do not fit into peripheral or other
registers are grouped here.
3.3.1 System Controls and Status register (SCS - 0xE01F C1A0)
Table 29. System Controls and Status register (SCS - address 0xE01F C1A0) bit description
Bit Symbol
Value Description
Access Reset
value
0
GPIOM
GPIO access mode selection.
R/W
0
0
1
GPIO ports 0 and 1 are accessed via APB addresses in a fashion
compatible with previous LPC2000 devices.
High speed GPIO is enabled on ports 0 and 1, accessed via addresses in
the on-chip memory range. This mode includes the port masking feature
described in the GPIO chapter.
1
EMC Reset
Disable[1]
External Memory Controller Reset Disable.
R/W
0
0
1
Both EMC resets are asserted when any type of reset event occurs. In this
mode, all registers and functions of the EMC are initialized upon any reset
condition.
Many portions of the EMC are only reset by a power-on or brown-out event,
in order to allow the EMC to retain its state through a warm reset (external
reset or watchdog reset). If the EMC is configured correctly, auto-refresh can
be maintained through a warm reset.
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Table 29. System Controls and Status register (SCS - address 0xE01F C1A0) bit description
Bit Symbol Value Description
Access Reset
value
2
3
-
-
Reserved. User software should not write ones to reserved bits. The value
read from a reserved bit is not defined.
NA
NA
MCIPWR
Active
Level[1]
MCIPWR pin control.
R/W
0
0
1
The MCIPWR pin is low.
The MCIPWR pin is high.
4
5
OSCRANGE
OSCEN
Main oscillator range select.
R/W
R/W
0
0
0
1
The frequency range of the main oscillator is 1 MHz to 20 MHz.
The frequency range of the main oscillator is 15 MHz to 24 MHz.
Main oscillator enable.
0
1
The main oscillator is disabled.
The main oscillator is enabled, and will start up if the correct external
circuitry is connected to the XTAL1 and XTAL2 pins.
6
OSCSTAT
Main oscillator status.
RO
0
0
1
The main oscillator is not ready to be used as a clock source.
The main oscillator is ready to be used as a clock source. The main
oscillator must be enabled via the OSCEN bit.
31:7 -
-
Reserved. User software should not write ones to reserved bits. The value
read from a reserved bit is not defined.
-
NA
[1] The state of this bit is preserved through a software reset, and only a POR or a BOD event will reset it to its default value.
3.4 AHB Configuration
The AHB configuration register allows changing AHB scheduling and arbitration
strategies.
Table 30. AHB configuration register map
Name
Description
Access Reset value
Address
AHBCFG1 Configures the AHB1 arbiter.
AHBCFG2 Configures the AHB2 arbiter.
R/W
R/W
0x0000 0145
0x0000 0145
0xE01F C188
0xE01F C18C
3.4.1 AHB Arbiter Configuration register 1 (AHBCFG1 - 0xE01F C188)
By default, the AHB1 access is scheduled round-robin (bit 0 = 1). For round-robin
scheduling, the default priority sequence will be CPU, DMA, AHB1, USB and LCD.
The AHB1 access priority can be configured as priority scheduling (bit 0 = 0) and priority
of the each of the AHB1 bus masters can be set by writing the priority value (highest
priority = 5, lowest priority = 1).
Masters with the same priority value are scheduled on a round-robin basis.
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Table 31. AHB Arbiter Configuration register 1 (AHBCFG1 - address 0xE01F C188) bit
description
Bit
Symbol
Value Description
Reset
value
0
scheduler
0
Priority scheduling.
Uniform (round-robin) scheduling.
1
1
2:1
break_burst
00
Break all defined length bursts (the CPU does not create 10
defined bursts).
01
10
11
0
Break all defined length bursts greater than four-beat.
Break all defined length bursts greater than eight-beat.
Never break defined length bursts.
3
quantum_type
quantum_size
A quantum is an AHB clock.
0
1
A quantum is an AHB bus cycle.
7:4
Controls the type of arbitration and the number of quanta 0100
before re-arbiration occurs.
0000 Preemptive, re-arbitrate after 1 AHB quantum.
0001 Preemptive, re-arbitrate after 2 AHB quanta.
0010 Preemptive, re-arbitrate after 4 AHB quanta.
0011 Preemptive, re-arbitrate after 8 AHB quanta.
0100 Preemptive, re-arbitrate after 16 AHB quanta.
0101 Preemptive, re-arbitrate after 32 AHB quanta.
0110 Preemptive, re-arbitrate after 64 AHB quanta.
0111 Preemptive, re-arbitrate after 128 AHB quanta.
1000 Preemptive, re-arbitrate after 256 AHB quanta.
1001 Preemptive, re-arbitrate after 512 AHB quanta.
1010 Preemptive, re-arbitrate after 1024 AHB quanta.
1011 Preemptive, re-arbitrate after 2048 AHB quanta.
1100 Preemptive, re-arbitrate after 4096 AHB quanta.
1101 Preemptive, re-arbitrate after 8192 AHB quanta.
1110 Preemptive, re-arbitrate after 16384 AHB quanta.
1111 Non- preemptive, infinite AHB quanta.
001
000
000
000
000
000
14:12 EP1
19:16 EP2
22:20 EP3
26:24 EP4
30:28 EP5
[1] Allowed values for nnn are: 101 (highest priority), 100, 011, 010, 001 (lowest priority).
3.4.1.1 Examples of AHB1 settings
The following examples use the LPC2478 to illustrate how to select the priority of each
AHB1 master based on different system requirements.
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Table 32. Priority sequence (bit 0 = 0): LCD, CPU, GPDMA, AHB1, USB
Bit
Symbol Description Priority value nnn
Priority sequence
14:12
18:16
22:20
26:24
30:28
EP1
EP2
EP3
EP4
EP5
CPU
100 (4)
011 (3)
010 (2)
001 (1)
101 (5)
2
3
4
5
1
GPDMA
AHB1
USB
LCD
Table 33. Priority sequence (bit 0 = 0): USB, AHB1, CPU, GPDMA, LCD
Bit
Symbol Description Priority value nnn
Priority sequence
14:12
18:16
22:20
26:24
30:28
EP1
EP2
EP3
EP4
EP5
CPU
011 (3)
010 (2)
100 (4)
101 (5)
011 (1)
3
4
2
1
5
GPDMA
AHB1
USB
LCD
Table 34. Priority sequence (bit 0 = 0): GPDMA, AHB1, CPU, LCD, USB
Bit
Symbol Description Priority value nnn
Priority sequence
14:12
18:16
22:20
26:24
30:28
EP1
EP2
EP3
EP4
EP5
CPU
011 (3)
100 (4)
100 (4)
001 (1)
010 (2)
3
GPDMA
AHB1
USB
1[1]
2[1]
5
LCD
4
[1] Sequence based on round-robin.
Table 35. Priority sequence (bit 0 = 0): USB, AHB1, CPU, GPDMA, LCD
Bit
Symbol Description Priority value nnn
Priority sequence
14:12
18:16
22:20
26:24
30:28
EP1
EP2
EP3
EP4
EP5
CPU
000
4[1]
5[1]
1
GPDMA
AHB1
USB
000
011 (3)
001 (1)
010 (2)
3
LCD
2
[1] Sequence based on round-robin.
3.4.2 AHB Arbiter Configuration register 2 (AHBCFG2 - 0xE01F C18C)
By default, the AHB2 access is scheduled round-robin (bit 0 = 1). For round-robin
scheduling, the default priority sequence will be Ethernet and CPU.
The AHB2 access priority can be configured as priority scheduling (bit 0 = 0) and priority
of the each of the AHB2 bus masters can be set by writing the priority value (highest
priority = 2, lowest priority = 1).
Masters with the same priority value are scheduled on a round-robin basis.
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Table 36. AHB Arbiter Configuration register 2 (AHBCFG2 - address 0xE01F C18C) bit
description
Bit
Symbol
Value Description
Reset
value
0
scheduler
0
Priority scheduling.
Uniform (round-robin) scheduling.
1
1
2:1
break_burst
00
Break all defined length bursts (the CPU does not create 10
defined bursts).
01
10
11
0
Break all defined length bursts greater than four-beat.
Break all defined length bursts greater than eight-beat.
Never break defined length bursts.
3
quantum_type
quantum_size
A quantum is an AHB clock.
0
1
A quantum is an AHB bus cycle.
7:4
Controls the type of arbitration and the number of quanta 0100
before re-arbiration occurs.
0000 Preemptive, re-arbitrate after 1 AHB quantum.
0001 Preemptive, re-arbitrate after 2 AHB quanta.
0010 Preemptive, re-arbitrate after 4 AHB quanta.
0011 Preemptive, re-arbitrate after 8 AHB quanta.
0100 Preemptive, re-arbitrate after 16 AHB quanta.
0101 Preemptive, re-arbitrate after 32 AHB quanta.
0110 Preemptive, re-arbitrate after 64 AHB quanta.
0111 Preemptive, re-arbitrate after 128 AHB quanta.
1000 Preemptive, re-arbitrate after 256 AHB quanta.
1001 Preemptive, re-arbitrate after 512 AHB quanta.
1010 Preemptive, re-arbitrate after 1024 AHB quanta.
1011 Preemptive, re-arbitrate after 2048 AHB quanta.
1100 Preemptive, re-arbitrate after 4096 AHB quanta.
1101 Preemptive, re-arbitrate after 8192 AHB quanta.
1110 Preemptive, re-arbitrate after 16384 AHB quanta.
1111 Non- preemptive, infinite AHB quanta.
9:8
default_master nn
Master 2 (Ethernet) is the default master.
External priority for master 1 (CPU).
External priority for master 2 (Ethernet).
01
00
00
NA
13:12 EP1
17:16 EP2
31:18 -
nn
nn
-
Reserved. User software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
[1] Allowed values for nn are: 10 (high priority) and 01 (low priority).
3.4.2.1 Examples of AHB2 settings
Table 37. Priority sequence (bit 0 = 0): Ethernet, CPU
Bit
Symbol Description Priority value nn
Priority sequence
13:12
18:16
EP1
EP2
CPU
10 (2)
01 (1)
1
2
Ethernet
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Table 38. Priority sequence (bit 0 = 0): Ethernet, CPU
Bit
Symbol Description Priority value nn
Priority sequence
13:12
18:16
EP1
EP2
CPU
00
00
2[1]
1[1]
Ethernet
[1] Sequence based on round-robin.
4. Brown-out detection
The LPC2400 includes 2-stage monitoring of the voltage on the VDD(3V3) pins. If this
voltage falls below 2.95 V, the Brown-Out Detector (BOD) asserts an interrupt signal to
the Vectored Interrupt Controller. This signal can be enabled for interrupt in the Interrupt
Enable Register in the VIC (see Section 7–3.4 “Interrupt Enable Register (VICIntEnable -
0xFFFF F010)”) in order to cause a CPU interrupt; if not, software can monitor the signal
by reading the Raw Interrupt Status Register (see Section 7–3.3 “Raw Interrupt Status
The second stage of low-voltage detection asserts Reset to inactivate the LPC2400 when
the voltage on the VDD(3V3) pins falls below 2.65 V. This Reset prevents alteration of the
flash as operation of the various elements of the chip would otherwise become unreliable
due to low voltage. The BOD circuit maintains this reset down below 1 V, at which point
the Power-On Reset circuitry maintains the overall Reset.
Both the 2.95 V and 2.65 V thresholds include some hysteresis. In normal operation, this
hysteresis allows the 2.95 V detection to reliably interrupt, or a regularly-executed event
loop to sense the condition.
But when Brown-Out Detection is enabled to bring the LPC2400 out of Power-Down mode
(which is itself not a guaranteed operation -- see Section 4–3.4.6 “Power Mode Control
register (PCON - 0xE01F C0C0)”), the supply voltage may recover from a transient before
the Wakeup Timer has completed its delay. In this case, the net result of the transient
BOD is that the part wakes up and continues operation after the instructions that set
Power-Down Mode, without any interrupt occurring and with the BOD bit in the RSID
being 0. Since all other wakeup conditions have latching flags (see Section 3–3.1.2
of this type, without any apparent cause, can be assumed to be a Brown-Out that has
gone away.
5. Code security vs. debugging
Applications in development typically need the debugging and tracing facilities in the
LPC2400. Later in the life cycle of an application, it may be more important to protect the
application code from observation by hostile or competitive eyes. The following feature of
the LPC2400 allows an application to control whether it can be debugged or protected
from observation.
Details on the way Code Read Protection works can be found in Section 30–8 “Code
Remark: CRP is not available for flashless LPC2400 parts.
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1. Summary of clocking and power control functions
This section describes the generation of the various clocks needed by the LPC2400 and
options of clock source selection, as well as power control and wakeup from reduced
power modes. Functions described in the following subsections include:
• Oscillators
• Clock Source Selection
• PLL
• Clock Dividers
• APB Divider
• Power Control
• Wakeup Timer
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Chapter 4: LPC24XX Clocking and power control
EXTERNAL
ETHERNET
PHY
usbclk
(48 MHz)
USB
CLOCK
USB BLOCK
MAIN
OSCILLATOR
DIVIDER
25 or
50 MHz
PLL
USB clock config
(USBCLKCFG)
pllclk
cclk
CPU
CLOCK
DIVIDER
system
clock
select
ARM7
TDMI-S
BYPASS
SYNCHRO-
NIZER
ETHERNET
BLOCK
(CLKSRCSEL)
CPU clock config
(CCLKCFG)
INTERNAL
RC
OSCILLATOR
EMC, LCD,
DMA, FAST I/O
VIC
WATCHDOG
TIMER
WDT
clock
select
CCLK/8
CCLK/6
CCLK/4
CCLK/2
CCLK
PERIPHERAL
CLOCK
GENERATOR
(WDTCLKSEL)
other peripherals
see PCLKSEL0/1
pclk
pclk
WDT
CAN1
pclk
CAN1
PCLK
SEL0[1:0]
PCONP[13]
RTC
PCLK
SEL0[27:26]
RTC
PRESCALER
PCONP[9]
PCLK
SEL0[19:18]
rtclk
RTC
OSCILLATOR
REAL-TIME
CLOCK
MCI
RTC
clock
select
(CCR)
pclk
BAT_RAM
2 kB BATTERY
RAM
pclk
MCI
PCLK
SEL1[1:0]
PCONP[28]
PCLK
SEL1[25:24]
SYSTEM
CTRL
pclk
SYSCON
PCLK
SEL1[29:28]
Fig 12. Clock generation for the LPC2400
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Chapter 4: LPC24XX Clocking and power control
2. Oscillators
The LPC2400 includes three independent oscillators. These are the Main Oscillator, the
Internal RC Oscillator, and the RTC oscillator. Each oscillator can be used for more than
one purpose as required in a particular application.
Following Reset, the LPC2400 will operate from the Internal RC Oscillator until switched
by software. This allows systems to operate without any external crystal, and allows the
Boot Loader code to operate at a known frequency. When Boot Block will branch to a user
program, there could be an option to activate the main oscillator prior to entering user
code.
2.1 Internal RC oscillator
The Internal RC Oscillator (IRC) may be used as the clock source for the watchdog timer,
and/or as the clock that drives the PLL and subsequently the CPU. The precision of the
IRC does not allow for use of the USB interface, which requires a much more precise time
base. Also, do not use the IRC for the CAN1/2 block if the CAN baud rate is higher than
100 kbit/s.The nominal IRC frequency is 4 MHz.
Upon power up or any chip reset, the LPC2400 uses the IRC as the clock source.
Software may later switch to one of the other available clock sources.
2.2 Main oscillator
The main oscillator can be used as the clock source for the CPU, with or without using the
PLL. The main oscillator operates at frequencies of 1 MHz to 24 MHz. This frequency can
be boosted to a higher frequency, up to the maximum CPU operating frequency, by the
PLL. The oscillator output is called oscclk. The clock selected as the PLL input is pllclkin
and the ARM processor clock frequency is referred to as cclk for purposes of rate
equations, etc. elsewhere in this document. The frequencies of pllclkin and cclk are the
same value unless the PLL is active and connected. Refer to the PLL description in this
chapter for details.
The onboard oscillator in the LPC24xx can operate in one of two modes: slave mode and
oscillation mode.
In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF
in this configuration can be left not connected.
integrated on chip, only a crystal and the capacitances CX1 and CX2 need to be connected
externally in case of fundamental mode oscillation (the fundamental frequency is
parallel package capacitance and should not be larger than 7 pF. Parameters FC, CL, RS
and CP are supplied by the crystal manufacturer.
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LPC24xx
LPC24xx
XTAL1
XTAL2
XTAL1
XTAL2
L
< = >
CC
Clock
CL
RS
CP
Xtal
CX1
CX2
a)
b)
c)
Fig 13. Oscillator modes and models: a) slave mode of operation, b) oscillation mode of operation, c) external
crystal model used for CX1 X2 evaluation
/
Table 39. Recommended values for CX1/X2 in oscillation mode (crystal and external
Fundamental Crystal load Maximum crystal External load
series resistance RS capacitors CX1
oscillation frequency capacitance CL
FOSC
,
CX2
1 MHz - 5 MHz
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
10 pF
< 300 Ω
< 300 Ω
< 300 Ω
< 300 Ω
< 200 Ω
< 100 Ω
< 160 Ω
< 60 Ω
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
5 MHz - 10 MHz
10 MHz - 15 MHz
15 MHz - 20 MHz
< 80 Ω
Table 40. Recommended values for CX1/X2 in oscillation mode (crystal and external
Fundamental Crystal load Maximum crystal External load
series resistance RS capacitors CX1
oscillation frequency capacitance CL
FOSC
,
CX2
15 MHz - 20 MHz
20 MHz - 25 MHz
10 pF
20 pF
10 pF
20 pF
< 180 Ω
< 100 Ω
< 160 Ω
< 80 Ω
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
39 pF, 39 pF
Since chip operation always begins using the Internal RC Oscillator, and the main
oscillator may never be used in some applications, it will only be started by software
request. This is accomplished by setting the OSCEN bit in the SCS register, as described
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register) so that software can determine when the oscillator is running and stable. At that
point, software can control switching to the main oscillator as a clock source. Prior to
starting the main oscillator, a frequency range must be selected by configuring the
OSCRANGE bit in the SCS register.
2.3 RTC oscillator
The RTC oscillator can be used as the clock source for the RTC, and/or the watchdog
timer. Also, the RTC oscillator can be used to drive the PLL and the CPU.
3. Register description
All registers, regardless of size, are on word address boundaries. Details of the registers
appear in the description of each function.
Table 41. Summary of system control registers
Name
Description
Access Reset
value[1]
Address
Clock source selection
CLKSRCSEL Clock Source Select Register
Phase Locked Loop
R/W
0
0xE01F C10C
PLLCON
PLL Control Register
PLL Configuration Register
PLL Status Register
PLL Feed Register
R/W
R/W
RO
0
0xE01F C080
0xE01F C084
0xE01F C088
0xE01F C08C
PLLCFG
0
PLLSTAT
0
PLLFEED
Clock dividers
CCLKCFG
WO
NA
CPU Clock Configuration Register
R/W
R/W
R/W
R/W
R/W
0
0xE01F C104
0xE01F C108
0xE01F C1A4
0xE01F C1A8
0xE01F C1AC
USBCLKCFG USB Clock Configuration Register
0
IRCTRIM
PCLKSEL0
PCLKSEL1
Power control
PCON
IRC Trim Register
0xA0
Peripheral Clock Selection register 0.
Peripheral Clock Selection register 1.
0
0
Power Control Register
R/W
R/W
0
0xE01F C0C0
0xE01F C144
0xE01F C0C4
INTWAKE
PCONP
Interrupt Wakeup Register
0
Power Control for Peripherals Register R/W
0x03BE
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
3.1 Clock source selection multiplexer
Several clock sources may be chosen to drive the PLL and ultimately the CPU and
on-chip peripheral devices. The clock sources available are the main oscillator, the RTC
oscillator, and the Internal RC (IRC) oscillator.
The clock source selection can only be changed safely when the PLL is not connected.
For a detailed description of how to change the clock source in a system using the PLL
Note the following restrictions regarding the choice of clock sources:
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• The IRC oscillator cannot be used as clock source for the USB block.
• The IRC oscillator cannot be used as clock source for the CAN controllers if the CAN
baud rate is larger than 100 kbit/s.
3.1.1 Clock Source Select register (CLKSRCSEL - 0xE01F C10C)
The PCLKSRCSEL register contains the bits that select the clock source for the PLL.
Table 42. Clock Source Select register (CLKSRCSEL - address 0xE01F C10C) bit
description
Bit Symbol
Value Description
Reset
value
1:0 CLKSRC
Selects the clock source for the PLL as follows:
0
00
Selects the Internal RC oscillator as the PLL clock source
(default).
01
10
11
Selects the main oscillator as the PLL clock source.
Selects the RTC oscillator as the PLL clock source.
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
Warning: Improper setting of this value, or an incorrect sequence of
changing this value may result in incorrect operation of the device.
7:2 -
0
Unused, always 0.
0
3.2 PLL (Phase Locked Loop)
The PLL accepts an input clock frequency in the range of 32 kHz to 24 MHz. The input
frequency is multiplied up to a high frequency, then divided down to provide the actual
clock used by the CPU and the USB block.
3.2.1 PLL operation
The PLL input, in the range of 32 kHZ to 24 MHz, may initially be divided down by a value
"N", which may be in the range of 1 to 256. This input division provides a greater number
of possibilities in providing a wide range of output frequencies from the same input
frequency.
Following the PLL input divider is the PLL multiplier. The multiplier can multiply the input
divider output through the use of a Current Controlled Oscillator (CCO) by a value "M", in
the range of 1 through 32768. The resulting frequency must be in the range of 275 MHz to
550 MHz. The multiplier works by dividing the CCO output by the value of M, then using a
phase-frequency detector to compare the divided CCO output to the multiplier input. The
error value is used to adjust the CCO frequency.
There are additional dividers at the PLL output to bring the frequency down to what is
needed for the CPU, USB, and other peripherals. The PLL output dividers are described
in the Clock Dividers section following the PLL description. A block diagram of the PLL is
shown in Figure 4–14
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USBSEL[3:0]
PLLC
PLLE
USB
CLOCK
DIVIDER
/6
PLOCK
usbclk =
48 MHz
refclk =
1.152 MHz
pd
pllclk =
288 MHz
288
MHz
pllclkin =
PHASE-
18.432 MHz
CPU
CLOCK
DIVIDER
/4
FREQUENCY
FILTER
/2
CCO
N-DIVIDER
/16
cclk =
72 MHz
DETECTOR
144 MHz
288 MHz
NSEL[23:16]
MSEL[14:0]
1.152 MHz
M-DIVIDER
/125
CCLKSEL[7:0]
Fig 14. PLL block diagram (N = 16, M = 125, USBSEL = 6, CCLKSEL = 4)
PLL activation is controlled via the PLLCON register. The PLL multiplier and divider
values are controlled by the PLLCFG register. These two registers are protected in order
to prevent accidental alteration of PLL parameters or deactivation of the PLL. Since all
chip operations, including the Watchdog Timer, could be dependent on the PLL if so
configured (for example when it is providing the chip clock), accidental changes to the PLL
setup could result in unexpected or fatal behavior of the microcontroller. The protection is
accomplished by a feed sequence similar to that of the Watchdog Timer. Details are
provided in the description of the PLLFEED register.
The PLL is turned off and bypassed following a chip Reset and by entering Power-down
mode. PLL is enabled by software only.
It is important that the setup procedure described in Section 4–3.2.14 “PLL setup
sequence” is followed as is or the PLL might not operate at all!.
3.2.2 PLL and startup/boot code interaction
The boot code for the LPC2400 is a different from previous NXP ARM7 LPC2000 chips.
When there is no valid code (determined by the checksum word) in the user flash or the
ISP enable pin (P2.10) is pulled low on startup, the ISP mode will be entered and the boot
code will setup the PLL with the IRC. Therefore it can not be assumed that the PLL is
disabled when the user opens a debug session to debug the application code. The user
startup code must follow the steps described in this chapter to disconnect the PLL.
The boot code may also change the values for some registers when the chip enters ISP
mode. For example, the GPIOM bit in the SCS register is set in the ISP mode. If the user
doesn't notice it and clears the GPIOM bit in the application code, the application code will
not be able to operate with the traditional GPIO function on PORT0 and PORT1.
3.2.3 PLL register description
follow. Writes to any unused bits are ignored. A read of any unused bits will return a logic
zero.
Warning: Improper setting of PLL values may result in incorrect operation of the
device!
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Table 43. PLL registers
Name
Description
Access Reset
value[1]
Address
PLLCON
PLL Control Register. Holding register for
updating PLL control bits. Values written to this
register do not take effect until a valid PLL feed
sequence has taken place.
R/W
0
0
0
0xE01F C080
PLLCFG
PLLSTAT
PLL Configuration Register. Holding register for R/W
updating PLL configuration values. Values
written to this register do not take effect until a
valid PLL feed sequence has taken place.
0xE01F C084
0xE01F C088
PLL Status Register. Read-back register for
PLL control and configuration information. If
PLLCON or PLLCFG have been written to, but
a PLL feed sequence has not yet occurred, they
will not reflect the current PLL state. Reading
this register provides the actual values
RO
controlling the PLL, as well as the PLL status.
PLLFEED
PLL Feed Register. This register enables
loading of the PLL control and configuration
information from the PLLCON and PLLCFG
registers into the shadow registers that actually
affect PLL operation.
WO
NA
0xE01F C08C
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
3.2.4 PLL Control register (PLLCON - 0xE01F C080)
The PLLCON register contains the bits that enable and connect the PLL. Enabling the
PLL allows it to attempt to lock to the current settings of the multiplier and divider values.
Connecting the PLL causes the processor and all chip functions to run from the PLL
output clock. Changes to the PLLCON register do not take effect until a correct PLL feed
sequence has been given (see Section 4–3.2.9 “PLL Feed register (PLLFEED -
Table 44. PLL Control register (PLLCON - address 0xE01F C080) bit description
Bit
Symbol Description
Reset
value
0
PLLE
PLLC
PLL Enable. When one, and after a valid PLL feed, this bit will
activate the PLL and allow it to lock to the requested frequency. See
0
1
PLL Connect. Having both PLLC and PLLE set to one followed by a
valid PLL feed sequence, the PLL becomes the clock source for the
CPU, as well as the USB subsystem and. Otherwise, the clock
selected by the Clock Source Selection Multiplexer is used directly
0
7:2
-
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
The PLL must be set up, enabled, and Lock established before it may be used as a clock
source. When switching from the oscillator clock to the PLL output or vice versa, internal
circuitry synchronizes the operation in order to ensure that glitches are not generated.
Hardware does not insure that the PLL is locked before it is connected or automatically
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disconnect the PLL if lock is lost during operation. In the event of loss of PLL lock, it is
likely that the oscillator clock has become unstable and disconnecting the PLL will not
remedy the situation.
3.2.5 PLL Configuration register (PLLCFG - 0xE01F C084)
The PLLCFG register contains the PLL multiplier and divider values. Changes to the
PLLCFG register do not take effect until a correct PLL feed sequence has been given (see
Section 4–3.2.9 “PLL Feed register (PLLFEED - 0xE01F C08C)”). Calculations for the
PLL frequency, and multiplier and divider values are found in the Section 4–3.2.11 “PLL
Table 45. PLL Configuration register (PLLCFG - address 0xE01F C084) bit description
Bit
Symbol
Description
Reset
value
14:0 MSEL
PLL Multiplier value. Supplies the value "M" in the PLL frequency
calculations. The value stored here is M - 1. Supported values for M
0
Note: Not all values of M are needed, and therefore some are not
supported by hardware. For details on selecting values for MSEL see
15
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
0
23:16 NSEL
PLL Pre-Divider value. Supplies the value "N" in the PLL frequency
calculations. PLL Pre-Divider value. Supplies the value "N" in the PLL
frequency calculations. Supported values for N are 1 through 32.
31:24 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
Table 46. Multiplier values for a 32 kHz oscillator
Multiplier (M)
4272
Pre-divide (N)
FCCO
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
279.9698
288.0307
300.0238
309.6576
315.0316
336.0031
340.0008
353.8944
359.9892
383.9754
395.9685
398.1312
400.0317
420.0202
432.0133
442.3680
4395
4578
4725
4807
5127
5188
5400
5493
5859
6042
6075
6104
6409
6592
6750
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Table 46. Multiplier values for a 32 kHz oscillator
Multiplier (M)
6836
Pre-divide (N)
FCCO
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
3
2
3
2
2
3
2
2
3
2
2
3
3
2
2
2
3
3
3
448.0041
449.9702
455.9995
462.0288
479.9857
486.6048
503.9718
512.0328
520.0282
528.0236
530.8416
280.0026
287.9980
299.9910
314.9988
336.0031
340.0008
359.9892
384.0082
396.0013
399.9990
419.9875
279.9916
432.0133
288.0089
448.0041
450.0029
300.0020
455.9995
461.9960
315.0097
479.9857
504.0046
336.0031
340.0008
512.0000
519.9954
527.9908
359.9892
383.9973
395.9904
6866
6958
7050
7324
7425
7690
7813
7935
8057
8100
8545
8789
9155
9613
10254
10376
10986
11719
12085
12207
12817
12817
13184
13184
13672
13733
13733
13916
14099
14420
14648
15381
15381
15564
15625
15869
16113
16479
17578
18127
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Table 46. Multiplier values for a 32 kHz oscillator
Multiplier (M)
18311
Pre-divide (N)
FCCO
3
3
3
3
3
3
3
3
3
3
3
3
400.0099
419.9984
431.9915
448.0041
449.9920
455.9995
462.0070
480.0075
503.9937
512.0109
520.0063
528.0017
19226
19775
20508
20599
20874
21149
21973
23071
23438
23804
24170
3.2.6 PLL Status register (PLLSTAT - 0xE01F C088)
The read-only PLLSTAT register provides the actual PLL parameters that are in effect at
the time it is read, as well as the PLL status. PLLSTAT may disagree with values found in
PLLCON and PLLCFG because changes to those registers do not take effect until a
proper PLL feed has occurred (see Section 4–3.2.9 “PLL Feed register (PLLFEED -
Table 47. PLL Status register (PLLSTAT - address 0xE01F C088) bit description
Bit
14:0 MSEL
15
23:16 NSEL
Symbol
Description
Reset
value
Read-back for the PLL Multiplier value. This is the value currently
used by the PLL, and is one less than the actual multiplier.
0
-
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
Read-back for the PLL Pre-Divider value. This is the value currently
used by the PLL, and is one less than the actual divider.
0
24
25
PLLE
PLLC
Read-back for the PLL Enable bit. When one, the PLL is currently
activated. When zero, the PLL is turned off. This bit is automatically
cleared when Power-down mode is activated.
0
Read-back for the PLL Connect bit. When PLLC and PLLE are both
one, the PLL is connected as the clock source for the LPC2400.
When either PLLC or PLLE is zero, the PLL is bypassed. This bit is
automatically cleared when Power-down mode is activated.
0
0
26
PLOCK
Reflects the PLL Lock status. When zero, the PLL is not locked.
When one, the PLL is locked onto the requested frequency. See
text for details.
31:27 -
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
3.2.7 PLL Interrupt: PLOCK
The PLOCK bit in the PLLSTAT register reflects the lock status of the PLL. When the PLL
is enabled, or parameters are changed, the PLL requires some time to establish lock
under the new conditions. PLOCK can be monitored to determine when the PLL may be
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connected for use. The value of PLOCK may not be stable when the PLL reference
frequency (FREF, the frequency of REFCLK, which is equal to the PLL input frequency
divided by the pre-divider value) is less than 100 kHz or greater than 20 MHz. In these
cases, the PLL may be assumed to be stable after a start-up time has passed. This time is
500 μs when FREF is greater than 400 kHz and 200 / FREF seconds when FREF is less
than 400 kHz
PLOCK is connected to the interrupt controller. This allows for software to turn on the PLL
and continue with other functions without having to wait for the PLL to achieve lock. When
the interrupt occurs, the PLL may be connected, and the interrupt disabled.
3.2.8 PLL Modes
Table 48. PLL control bit combinations
PLLC PLLE PLL Function
0
0
1
1
0
1
0
1
PLL is turned off and disconnected. The PLL outputs the unmodified clock
input.
The PLL is active, but not yet connected. The PLL can be connected after
PLOCK is asserted.
Same as 00 combination. This prevents the possibility of the PLL being
connected without also being enabled.
The PLL is active and has been connected as the system clock source.
3.2.9 PLL Feed register (PLLFEED - 0xE01F C08C)
A correct feed sequence must be written to the PLLFEED register in order for changes to
the PLLCON and PLLCFG registers to take effect. The feed sequence is:
1. Write the value 0xAA to PLLFEED.
2. Write the value 0x55 to PLLFEED.
The two writes must be in the correct sequence, and must be consecutive APB bus
cycles. The latter requirement implies that interrupts must be disabled for the duration of
the PLL feed operation. If either of the feed values is incorrect, or one of the previously
mentioned conditions is not met, any changes to the PLLCON or PLLCFG register will not
become effective.
Table 49. PLL Feed register (PLLFEED - address 0xE01F C08C) bit description
Bit
Symbol
Description
Reset
value
7:0
PLLFEED The PLL feed sequence must be written to this register in order for
PLL configuration and control register changes to take effect.
0x00
3.2.10 PLL and Power-down mode
Power-down mode automatically turns off and disconnects the PLL. Wakeup from
Power-down mode does not automatically restore the PLL settings, this must be done in
software. Typically, a routine to activate the PLL, wait for lock, and then connect the PLL
can be called at the beginning of any interrupt service routine that might be called due to
the wakeup. It is important not to attempt to restart the PLL by simply feeding it when
execution resumes after a wakeup from Power-down mode. This would enable and
connect the PLL at the same time, before PLL lock is established.
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3.2.11 PLL frequency calculation
The PLL equations use the following parameters:
Table 50. PLL frequency parameter
Parameter
Description
FIN
FCCO
N
the frequency of pllclkin from the Clock Source Selection Multiplexer.
the frequency of the pllclk (output of the PLL Current Controlled Oscillator)
PLL Pre-divider value from the NSEL bits in the PLLCFG register (PLLCFG
NSEL field + 1). N is an integer from 1 through 32.
M
PLL Multiplier value from the MSEL bits in the PLLCFG register (PLLCFG
MSEL field + 1). Not all potential values are supported. See below.
FREF
PLL internal reference frequency, FIN divided by N.
The PLL output frequency (when the PLL is both active and connected) is given by:
FCCO = (2 × M × FIN) / N
The PLL inputs and settings must meet the following:
• FIN is in the range of 32 kHz to 50 MHz.
• FCCO is in the range of 275 MHz to 550 MHz.
The PLL equation can be solved for other PLL parameters:
M = (FCCO × N) / (2 × FIN)
N = (2 × M × FIN) / FCCO
FIN = (FCCO × N) / (2 × M)
Allowed values for M:
At higher oscillator frequencies, in the MHz range, values of M from 6 through 512 are
allowed. This supports the entire useful range of both the main oscillator and the IRC.
For lower frequencies, specifically when the RTC is used to clock the PLL, a set of 65
additional M values have been selected for supporting baud rate generation, CAN/USB
Table 51. Additional Multiplier Values for use with a Low Frequency Clock Input
Low Frequency PLL Multipliers
4272
5127
6042
6750
7324
8057
9613
12085
13733
15381
4395
5188
4578
5400
4725
5493
4807
5859
6075
6104
6409
6592
6836
6866
6958
7050
7425
7690
7813
7935
8100
8545
8789
9155
10254
12207
13916
15564
10376
12817
14099
15625
10986
13184
14420
15869
11719
13672
14648
16113
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Table 51. Additional Multiplier Values for use with a Low Frequency Clock Input
Low Frequency PLL Multipliers
16479
19775
21973
17578
20508
23071
18127
20599
23438
18311
20874
23804
19226
21149
24170
3.2.12 Procedure for determining PLL settings
PLL parameter determination can be simplified by using a spreadsheet available from
NXP. To determine PLL parameters by hand, the following general procedure may be
used:
1. Determine if the application requires use of the USB interface. The USB requires a
50% duty cycle clock of 48 MHz within a very small tolerance, which means that FCCO
must be an even integer multiple of 48 MHz (i.e. an integer multiple of 96 MHz), within
a very small tolerance.
2. Choose the desired processor operating frequency (cclk). This may be based on
processor throughput requirements, need to support a specific set of UART baud
rates, etc. Bear in mind that peripheral devices may be running from a lower clock
frequency than that of the processor (see Section 4–3.3 “Clock dividers” on page 56
a multiple of the desired cclk frequency, bearing in mind the requirement for USB
support in [1] above, and that lower values of FCCO result in lower power dissipation.
3. Choose a value for the PLL input frequency (FIN). This can be a clock obtained from
the main oscillator, the RTC oscillator, or the on-chip RC oscillator. For USB support,
the main oscillator should be used.
4. Calculate values for M and N to produce a sufficiently accurate FCCO frequency. The
desired M value -1 will be written to the MSEL field in PLLCFG. The desired N value -1
will be written to the NSEL field in PLLCFG.
In general, it is better to use a smaller value for N, to reduce the level of multiplication that
must be accomplished by the CCO. Due to the difficulty in finding the best values in some
cases, it is recommended to use a spreadsheet or similar method to show many
possibilities at once, from which an overall best choice may be selected. A spreadsheet is
available from NXP for this purpose.
3.2.13 Examples of PLL settings
The following examples illustrate selecting PLL values based on different system
requirements.
Example 1)
Assumptions:
• The USB interface will be used in the application. The lowest integer multiple of
96 MHz that falls within the PLL operating range (288 MHz) will be targeted.
• The desired CPU rate = 60 MHz.
• An external 4 MHz crystal or clock source will be used as the system clock source.
Calculations:
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M = (FCCO × N) / (2 × FIN)
Start by assuming N = 1, since this produces the smallest multiplier needed for the PLL.
So, M = 288 × 106 / (2 × 4 × 106) = 36. Since the result is an integer, there is no need to
look further for a good set of PLL configuration values. The value written to PLLCFG
would be 0x23 (N - 1 = 0; M - 1 = 35 = 0x23).
The potential CPU clock rate can be determined by dividing FCCO by the desired CPU
frequency: 288 × 106 / 60 × 106 = 4.8. The nearest integer value for the CPU Clock
Divider is then 5, giving us 57.6 MHz as the nearest value to the desired CPU clock rate.
If it is important to obtain exactly 60 MHz, an FCCO rate must be found that can be divided
down to both 48 MHz and 60 MHz. The only possibility is 480 MHz. Divided by 10, this
gives the 48 MHz with a 50% duty cycle needed by the USB block. Divided by 8, it gives
60 MHz for the CPU clock. PLL settings for 480 MHz are N = 1 and M = 60.
Example 2)
Assumptions:
• The USB interface will not be used in the application.
• The desired CPU rate = 72 MHz
• The 32.768 kHz RTC clock source will be used as the system clock source
Calculations:
M = (FCCO × N) / (2 × FIN)
The smallest frequency for FCCO that can produce our desired CPU clock rate and is
within the PLL operating range is 288 MHz (4 × 72 MHz). Start by assuming N = 1, since
this produces the smallest multiplier needed for the PLL.
So, M = 288 × 106 / (2 × 32,768) = 4,394.53125. This is not an integer, so the CPU
frequency will not be exactly 288 MHz with this setting. Since this case is less obvious, it
Table 52. Potential values for PLL example
N
M
M Rounded FREF (Hz) FCCO (MHz)
Actual
% Error
CCLK (MHz)
1
2
3
4
5
4394.53125 4395
8789.0625 8789
13183.59375 13184
17578.125 17578
21972.65625 21973
32768
16384
10922.67
8192
288.0307
287.9980
288.0089
287.9980
288.0045
72.0077
71.9995
72.0022
71.9995
72.0011
0.0107
-0.0007
0.0031
-0.0007
0.0016
6553.6
Beyond N = 7, the value of M is out of range or not supported, so the table stops there. In
the table, the calculated M value is rounded to the nearest integer. If this results in CCLK
being above the maximum operating frequency (72 MHz), it is allowed if it is not more than
1/2 % above the maximum frequency.
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In general, larger vlaues of FREF result in a more stable PLL when the input clock is a low
frequency. Even the first table entry shows a very small error of just over 1 hundredth of a
percent, or 107 parts per million (ppm). If that is not accurate enough in the application,
the second case gives a much smaller error of 7 ppm.
Remember that when a frequency below about 1 MHz is used as the PLL clock source,
not all multiplier values are available. As it turns out, all of the rounded M values found in
If PLL calculations suggest use of unsupported multiplier values, those values must be
disregarded and other values examined to find the best fit. Multiplier values one count off
from calculated values may also be good possibilities..
The value written to PLLCFG for the second table entry would be 0x12254
(N - 1 = 1 = 0x1; M - 1 = 8788 = 0x2254).
3.2.14 PLL setup sequence
The following sequence must be followed step by step in order to have the PLL initialized
an running:
1. Disconnect the PLL with one feed sequence if PLL is already connected.
2. Disable the PLL with one feed sequence.
3. Change the CPU Clock Divider setting to speed up operation without the PLL, if
desired.
4. Write to the Clock Source Selection Control register to change the clock source.
5. Write to the PLLCFG and make it effective with one feed sequence. The PLLCFG can
only be updated when the PLL is disabled.
6. Enable the PLL with one feed sequence.
7. Change the CPU Clock Divider setting for the operation with the PLL. It's critical to do
this before connecting the PLL.
8. Wait for the PLL to achieve lock by monitoring the PLOCK bit in the PLLSTAT register,
or using the PLOCK interrupt, or wait for a fixed time when the input clock to PLL is
slow (i.e. 32 kHz). The value of PLOCK may not be stable when the PLL reference
frequency (FREF, the frequency of REFCLK, which is equal to the PLL input
frequency divided by the pre-divider value) is less than 100 kHz or greater than
20 MHz. In these cases, the PLL may be assumed to be stable after a start-up time
has passed. This time is 500 µs when FREF is greater than 400 kHz and 200 / FREF
seconds when FREF is less than 400 kHz.
9. Connect the PLL with one feed sequence.
It's very important not to merge any steps above. For example, don't update the PLLCFG
and enable the PLL simultaneously with the same feed sequence.
3.3 Clock dividers
The output of the PLL must be divided down for use by the CPU and the USB block.
Separate dividers are provided such that the CPU frequency can be determined
independently from the USB block, which always requires 48 MHz with a 50% duty cycle
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3.3.1 CPU Clock Configuration register (CCLKCFG - 0xE01F C104)
The CCLKCFG register controls the division of the PLL output before it is used by the
CPU. When the PLL is bypassed, the division may be by 1. When the PLL is running, the
output must be divided in order to bring the CPU clock frequency (cclk) within operating
limits. An 8 bit divider allows a range of options, including slowing CPU operation to a low
rate for temporary power savings without turning off the PLL.
Note: When the USB interface is used in an application, cclk must be at least 18 MHz in
order to support internal operations of the USB block.
Table 53. CPU Clock Configuration register (CCLKCFG - address 0xE01F C104) bit
description
Bit Symbol
Description
Reset
value
7:0 CCLKSEL
Selects the divide value for creating the CPU clock (CCLK) from the 0x00
PLL output.
Only 0 and odd values (1, 3, 5, ..., 255) are supported and can be
used when programming the CCLKSEL bits.
Warning: Using an even value (2, 4, 6, ..., 254) when setting the
CCLKSEL bits may result in incorrect operation of the device.
The cclk is derived from the PLL output signal, divided by CCLKSEL + 1. Having
CCLKSEL = 1 results in CCLK being one half the PLL output, CCLKSEL = 3 results in
CCLK being one quarter of the PLL output, etc..
3.3.2 USB Clock Configuration register (USBCLKCFG - 0xE01F C108)
The USBCLKCFG register controls the division of the PLL output before it is used by the
USB block. If the PLL is bypassed, the division may be by 1. In that case, the PLL input
frequency must be 48 MHz, with a 500 ppm tolerance. When the PLL is running, the
output must be divided in order to bring the USB clock frequency to 48 MHz with a 50%
duty cycle. A 4-bit divider allows obtaining the correct USB clock from any even multiple of
48 MHz (i.e. any mutliple of 96 MHz) within the PLL operating range.
Remark: The Internal RC clock can not be used as a clock source for USB because a
Table 54. USB Clock Configuration register (USBCLKCFG - address 0xE01F C108) bit
description
Bit Symbol
Description
Reset
value
3:0 USBSEL
Selects the divide value for creating the USB clock from the PLL output. 0
Warning: Improper setting of this value will result in incorrect operation
of the USB interface.
7:4 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
[1] Actual reset value depends on IRC factory trimming.
The USB clock is derived from the PLL output signal, divided by USBSEL + 1. Having
USBSEL = 1 results in USB’s clock being one half the PLL output.
3.3.3 IRC Trim Register (IRCTRIM - 0xE01F C1A4)
This register is used to trim the on-chip 4 MHz oscillator.
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Table 55. IRC Trim register (IRCTRIM - address 0xE01F C1A4) bit description
Bit
Symbol
Description
Reset
value
7:0
IRCtrim
-
IRC trim value. It controls the on-chip 4 MHz IRC frequency.
Reserved. Software must write 0 into these bits.
0xA0
NA
15:8
3.3.4 Peripheral Clock Selection registers 0 and 1 (PCLKSEL0 - 0xE01F C1A8 and
PCLKSEL1 - 0xE01F C1AC)
A pair of bits in a Peripheral Clock Selection register controls the rate of the clock signal
Table 56. Peripheral Clock Selection register 0 (PCLKSEL0 - address 0xE01F C1A8) bit
description
Bit
Symbol
Description
Reset
value
1:0
3:2
5:4
7:6
9:8
PCLK_WDT
Peripheral clock selection for WDT.
Peripheral clock selection for TIMER0.
Peripheral clock selection for TIMER1.
Peripheral clock selection for UART0.
Peripheral clock selection for UART1.
Peripheral clock selection for PWM0.
Peripheral clock selection for PWM1.
Peripheral clock selection for I2C0.
Peripheral clock selection for SPI.
Peripheral clock selection for RTC.
Peripheral clock selection for SSP1.
Peripheral clock selection for DAC.
Peripheral clock selection for ADC.
Peripheral clock selection for CAN1.
Peripheral clock selection for CAN2.
Peripheral clock selection for CAN filtering.
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
PCLK_TIMER0
PCLK_TIMER1
PCLK_UART0
PCLK_UART1
11:10 PCLK_PWM0
13:12 PCLK_PWM1
15:14 PCLK_I2C0
17:16 PCLK_SPI
19:18 PCLK_RTC[1]
21:20 PCLK_SSP1
23:22 PCLK_DAC
25:24 PCLK_ADC
27:26 PCLK_CAN1
29:28 PCLK_CAN2
31:30 PCLK_ACF
[1] For PCLK_RTC only, the value ’01’ is illegal. Do not write ’01’ to the PCLK_RTC. Attempting to write ’01’
results in the previous value being unchanged.
Table 57. Peripheral Clock Selection register 1 (PCLKSEL1 - address 0xE01F C1AC) bit
description
Bit
Symbol
Description
Reset
value
1:0
3:2
5:4
7:6
9:8
PCLK_BAT_RAM
PCLK_GPIO
PCLK_PCB
PCLK_I2C1
-
Peripheral clock selection for the battery supported RAM.
Peripheral clock selection for GPIOs.
Peripheral clock selection for the Pin Connect block.
Peripheral clock selection for I2C1.
00
00
00
00
00
00
Unused, always read as 0.
11:10 PCLK_SSP0
Peripheral clock selection for SSP0.
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Table 57. Peripheral Clock Selection register 1 (PCLKSEL1 - address 0xE01F C1AC) bit
description
Bit
Symbol
Description
Reset
value
13:12 PCLK_TIMER2
15:14 PCLK_TIMER3
17:16 PCLK_UART2
19:18 PCLK_UART3
21:20 PCLK_I2C2
23:22 PCLK_I2S
Peripheral clock selection for TIMER2.
Peripheral clock selection for TIMER3.
Peripheral clock selection for UART2.
Peripheral clock selection for UART3.
Peripheral clock selection for I2C2.
Peripheral clock selection for I2S.
Peripheral clock selection for MCI.
Unused, always read as 0.
00
00
00
00
00
00
00
00
00
00
25:24 PCLK_MCI
27:26
29:28 PCLK_SYSCON
31:30
-
Peripheral clock selection for the System Control block.
Unused, always read as 0.
-
Table 58. Peripheral Clock Selection register bit values
PCLKSEL0 and PCLKSEL1 Function
individual peripheral’s clock
select options
Reset
value
00
01
10
11
PCLK_xyz = CCLK/4
PCLK_xyz = CCLK[1]
PCLK_xyz = CCLK/2
00
Peripheral’s clock is selected to PCLK_xyz = CCLK/8
except for CAN1, CAN2, and CAN filtering when ’11’
selects PCLK_xyz = CCLK/6.
[1] For PCLK_RTC only, the value ’01’ is illegal. Do not write ’01’ to the PCLK_RTC. Attempting to write ’01’
results in the previous value being unchanged.
3.4 Power control
The LPC2400 supports a variety of power control features. There are three special modes
of processor power reduction: Idle mode, Sleep mode, and Power-down mode. The CPU
clock rate may also be controlled as needed by changing clock sources, re-configuring
PLL values, and/or altering the CPU clock divider value. This allows a trade-off of power
versus processing speed based on application requirements. In addition, Peripheral
Power Control allows shutting down the clocks to individual on-chip peripherals, allowing
fine tuning of power consumption by eliminating all dynamic power use in any peripherals
that are not required for the application.
The LPC2400 also implements a separate power domain in order to allow turning off
power to the bulk of the device while maintaining operation of the Real Time Clock and a
small static RAM, referred to as the Battery RAM. This feature is described in more detail
later in this chapter under the heading Power Domains, and in the Real Time Clock and
Battery RAM chapter.
3.4.1 Idle mode
When Idle mode is entered, the clock to the core is stopped. Resumption from the Idle
mode does not need any special sequence but re-enabling the clock to the ARM core.
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Chapter 4: LPC24XX Clocking and power control
In Idle mode, execution of instructions is suspended until either a Reset or interrupt
occurs. Peripheral functions continue operation during Idle mode and may generate
interrupts to cause the processor to resume execution. Idle mode eliminates dynamic
power used by the processor itself, memory systems and related controllers, and internal
buses.
3.4.2 Sleep mode
When the chip enters the Sleep mode, the main oscillator is powered down and all clocks
are stopped. The output of the IRC is disabled but the IRC is not powered down for a fast
wakeup later. The 32 kHz RTC oscillator is not stopped because the RTC interrupts may
be used as the wakeup source. The Flash is left in the standby mode allowing a very quick
wakeup. The PLL is automatically turned off and disconnected. The CCLK and USBCLK
clock dividers automatically get reset to zero.
The processor state and registers, peripheral registers, and internal SRAM values are
preserved throughout Sleep mode and the logic levels of chip pins remain static. The
Sleep mode can be terminated and normal operation resumed by either a Reset or certain
specific interrupts that are able to function without clocks. Since all dynamic operation of
the chip is suspended, Sleep mode reduces chip power consumption to a very low value.
On the wakeup of sleep mode, if the IRC was used before entering sleep mode, the 2-bit
IRC timer starts counting and the code execution and peripherals activities will resume
after the timer expires (4 cycles). If the main external oscillator was used, the 12-bit main
oscillator timer starts counting and the code execution will resume when the timer expires
(4096 cycles). Customer must not forget to re-configure the PLL and clock dividers after
the wakeup.
3.4.3 Power-down mode
Power-down mode does everything that Sleep mode does, but also turns off the Flash
memory. This saves more power, but requires waiting for resumption of Flash operation
before execution of code or data access in the Flash memory can be accomplished.
When the chip enters power-down mode, the IRC, the main oscillator and all clocks are
stopped. The 32Khz RTC oscillator is not stopped because the RTC interrupts may be
used as the wakeup source. The flash is forced into power-down mode. The PLL is
automatically turned off and disconnected. The CCLK and USBCLK clock dividers
automatically get reset to zero.
On the wakeup of power-down mode, if the IRC was used before entering power-down
mode, after IRC-start-up time (60 μs), the 2-bit IRC timer starts counting and expires in 4
cycles. The code execution can then be resumed immediately upon the expiration of the
IRC timer if the code was running from SRAM. In the meantime, the Flash wakeup-timer
generates Flash start-up time 100 μs. When it times out, access to the Flash is enabled.
Customer must not forget to re-configure the PLL and clock dividers after the wakeup.
3.4.4 Peripheral power control
A Power Control for Peripherals feature allows individual peripherals to be turned off if
they are not needed in the application, resulting in additional power savings. This is
detailed in the description of the PCONP register.
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Chapter 4: LPC24XX Clocking and power control
3.4.5 Power control register description
descriptions follow.
Table 59. Power Control registers
Name
Description
Access Reset
value[1]
Address
PCON
Power Control Register. This register
contains control bits that enable the two
reduced power operating modes of the
R/W
0x00
0xE01F C0C0
INTWAKE Interrupt Wakeup Register. Controls which
interrupts will wake the LPC2400 from
R/W
0x00
0xE01F C144
0xE01F C0C4
PCONP
Power Control for Peripherals Register. This R/W
register contains control bits that enable and
disable individual peripheral functions,
allowing elimination of power consumption by
peripherals that are not needed.
[1]
Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
3.4.6 Power Mode Control register (PCON - 0xE01F C0C0)
Table 60. Power Mode Control register (PCON - address 0xE01F C0C0) bit description
Bit Symbol
Description
Reset
value
0
1
2
PM0 (IDL) Power mode control bit 0. See text and table below for details.
PM1 (PD) Power mode control bit 1. See text and table below for details.
0
0
0
BODPDM Brown-Out Power-down Mode. When BODPDM is 1, the Brown-Out
Detect circuitry will turn off when chip Power-down mode is entered,
resulting in a further reduction in power usage. However, the possibility
of using Brown-Out Detect as a wakeup source from Power-down mode
will be lost.
When 0, the Brown-Out Detect function remains active during
Power-down mode.
See the System Control Block chapter for details of Brown-Out
detection.
3
BOGD
Brown-Out Global Disable. When BOGD is 1, the Brown-Out Detect
circuitry is fully disabled at all times, and does not consume power.
0
When 0, the Brown-Out Detect circuitry is enabled.
See the System Control Block chapter for details of Brown-Out
detection.
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Chapter 4: LPC24XX Clocking and power control
Table 60. Power Mode Control register (PCON - address 0xE01F C0C0) bit description
Bit Symbol
Description
Reset
value
4
BORD
Brown-Out Reset Disable. When BORD is 1, the second stage of low
voltage detection (2.6 V) will not cause a chip reset.
0
When BORD is 0, the reset is enabled. The first stage of low voltage
detection (2.9 V) Brown-Out interrupt is not affected.
See the System Control Block chapter for details of Brown-Out
detection.
6:3
7
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
0
PM2
Power mode control bit 2. See text and table below for details.
Encoding of Reduced Power Modes
The PM2, PM1, and PM0 bits in PCON allow entering reduced power modes as needed.
The encoding of these bits allows backward compatibility with devices that previously only
three reduced power modes supported by the LPC2400.
Table 61. Encoding of reduced power modes
PM2, PM1, PM0 Description
000
001
Normal operation
Idle mode. Causes the processor clock to be stopped, while on-chip peripherals
remain active. Any enabled interrupt from a peripheral or an external interrupt
source will cause the processor to resume execution. See text for details.
101
Sleep mode. This mode is similar to Power-down mode (the oscillator and all
on-chip clocks are stopped), but the Flash memory is left in Standby mode. This
allows a more rapid wakeup than Power-down mode because the Flash
reference voltage regulator start-up time is not needed. See text for details.
010
Power-down mode. Causes the oscillator and all on-chip clocks to be stopped.
A wakeup condition from an external interrupt can cause the oscillator to
re-start, the PD bit to be cleared, and the processor to resume execution. See
text for details.
Others
Reserved, not currently used.
3.4.7 Interrupt Wakeup Register (INTWAKE - 0xE01F C144)
Enable bits in the INTWAKE register allow the external interrupts to wake up the
processor if it is in Power-down mode. The related EINTn function must be mapped to the
pin in order for the wakeup process to take place. It is not necessary for the interrupt to be
enabled in the Vectored Interrupt Controller for a wakeup to take place. This arrangement
allows additional capabilities, such as having an external interrupt input wake up the
processor from Power-down mode without causing an interrupt (simply resuming
operation), or allowing an interrupt to be enabled during Power-down without waking the
processor up if it is asserted (eliminating the need to disable the interrupt if the wakeup
feature is not desirable in the application). Details of the wakeup operations are shown in
For an external interrupt pin to be a source that would wake up the microcontroller from
Power-down mode, it is also necessary to clear the corresponding interrupt flag (see
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Chapter 4: LPC24XX Clocking and power control
Table 62. Interrupt Wakeup register (INTWAKE - address 0xE01F C144) bit description
Bit
Symbol
Description
Reset
value
0
EXTWAKE0
EXTWAKE1
EXTWAKE2
EXTWAKE3
ETHWAKE
When one, assertion of EINT0 will wake up the processor from
Power-down mode.
0
0
0
0
0
1
When one, assertion of EINT1 will wake up the processor from
Power-down mode.
2
When one, assertion of EINT2 will wake up the processor from
Power-down mode.
3
When one, assertion of EINT3 will wake up the processor from
Power-down mode.
4
When one, assertion of the Wake-up on LAN interrupt
(WakeupInt) of the Ethernet block will wake up the processor
from Power-down mode.
5
USBWAKE
When one, activity on the USB bus will wake up the processor
from Power-down mode. Any change of state on the USB data
pins will cause a wakeup when this bit is set. For details on the
relationship of USB to Power-down Mode and wakeup, see the
relevant USB chapter(s).
0
6
7
8
CANWAKE
When one, activity of the CAN bus will wake up the processor
from Power-down mode. Any change of state on the CAN
receive pins will cause a wakeup when this bit is set.
0
0
0
GPIO0WAKE
GPIO2WAKE
When one, specified activity on GPIO pins on port 0 enabled for
wakeup will wake up the processor from Power-down mode.
When one, specified activity on GPIO pins on port 2 enabled for
wakeup will wake up the processor from Power-down mode.
13:9
14
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
BODWAKE
When one, Brown-Out Detect interrupt will wake up the
processor from Power-down mode.
0
Note: since there is a delay before execution begins, there is
no guarantee that execution will resume before VDD(3V3) has
fallen below the lower BOD threshold, which prevents
execution. If execution does resume, there is no guarantee of
how long the processor will continue execution before the lower
BOD threshold terminates execution. These issues depend on
the slope of the decline of VDD(3V3). High decoupling
capacitance (between VDD(3V3) and ground) in the vicinity of the
LPC2400 will improve the likelihood that software will be able to
do what needs to be done when power is in the process of
being lost.
15
RTCWAKE
When one, assertion of an RTC interrupt will wake up the
processor from Power-down mode.
0
3.4.8 Power Control for Peripherals register (PCONP - 0xE01F C0C4)
The PCONP register allows turning off selected peripheral functions for the purpose of
saving power. This is accomplished by gating off the clock source to the specified
peripheral blocks. A few peripheral functions cannot be turned off (i.e. the Watchdog timer,
GPIO, the Pin Connect block, and the System Control block).
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Chapter 4: LPC24XX Clocking and power control
Some peripherals, particularly those that include analog functions, may consume power
that is not clock dependent. These peripherals may contain a separate disable control that
turns off additional circuitry to reduce power. Information on peripheral specific power
saving features may be found in the chapter describing that peripheral.
2–17 “APB peripherals and base addresses” in the "LPC2400 Memory Addressing"
chapter.
If a peripheral control bit is 1, that peripheral is enabled. If a peripheral bit is 0, that
peripheral’s clock is disabled (gated off) to conserve power. For example if bit 19 is 1, the
I2C1 interface is enabled. If bit 19 is 0, the I2C1 interface is disabled.
Important: valid read from a peripheral register and valid write to a peripheral
register is possible only if that peripheral is enabled in the PCONP register!
Table 63. Power Control for Peripherals register (PCONP - address 0xE01F C0C4) bit
description
Bit
Symbol
Description
Reset
value
0
-
Unused, always 0
0
1
1
1
1
1
1
1
1
1
1
1
0
1
PCTIM0
PCTIM1
Timer/Counter 0 power/clock control bit.
Timer/Counter 1 power/clock control bit.
2
3
PCUART0 UART0 power/clock control bit.
PCUART1 UART1 power/clock control bit.
PCPWM0 PWM0 power/clock control bit.
PCPWM1 PWM1 power/clock control bit.
4
5
6
7
PCI2C0
PCSPI
The I2C0 interface power/clock control bit.
8
The SPI interface power/clock control bit.
The RTC power/clock control bit.
9
PCRTC
PCSSP1
PCEMC
PCAD
10
11
12
The SSP1 interface power/clock control bit.
External Memory Controller
A/D converter (ADC) power/clock control bit.
Note: Clear the PDN bit in the AD0CR before clearing this bit, and set
this bit before setting PDN.
13
14
PCCAN1
PCCAN2
CAN Controller 1 power/clock control bit.
CAN Controller 2 power/clock control bit.
0
0
18:15 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
19
20
21
22
23
24
25
26
PCI2C1
The I2C1 interface power/clock control bit.
1
0
1
0
0
0
0
1
PCLCD[1]
PCSSP0
PCTIM2
PCTIM3
LCD controller power control bit.
The SSP0 interface power/clock control bit.
Timer 2 power/clock control bit.
Timer 3 power/clock control bit.
PCUART2 UART 2 power/clock control bit.
PCUART3 UART 3 power/clock control bit.
PCI2C2
I2S interface 2 power/clock control bit.
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Chapter 4: LPC24XX Clocking and power control
Table 63. Power Control for Peripherals register (PCONP - address 0xE01F C0C4) bit
description
Bit
Symbol
Description
Reset
value
27
28
29
30
31
PCI2S
I2S interface power/clock control bit.
0
0
0
0
0
PCSDC
SD card interface power/clock control bit.
PCGPDMA GP DMA function power/clock control bit.
PCENET
PCUSB
Ethernet block power/clock control bit.
USB interface power/clock control bit.
[1] LPC247x only.
3.4.9 Power control usage notes
After every reset, the PCONP register contains the value that enables selected interfaces
and peripherals controlled by the PCONP to be enabled. Therefore, apart from proper
configuring via peripheral dedicated registers, the user’s application might have to access
the PCONP in order to start using some of the on-board peripherals.
Power saving oriented systems should have 1s in the PCONP register only in positions
that match peripherals really used in the application. All other bits, declared to be
"Reserved" or dedicated to the peripherals not used in the current application, must be
cleared to 0.
4. Power domains
The LPC2400 provides two independent power domains that allow the bulk of the device
to have power removed while maintaining operation of the Real Time Clock and the
Battery RAM.
The VBAT pin supplies power only to the RTC and the Battery RAM. These two functions
require a minimum of power to operate, which can be supplied by an external battery.
When the CPU and the rest of chip functions are stopped and power removed, the RTC
can supply an alarm output that may be used by external hardware to restore chip power
Note: The RTC and the battery RAM operate independently from each other. Therefore,
the battery RAM can be accessed at any time, regardless of whether the RTC is enabled
or disabled via a dedicated bit in the PCONP register.
5. Wakeup timer
The LPC2400 begins operation at power-up and when awakened from Power-down mode
by using the 4 MHz IRC oscillator as the clock source. This allows chip operation quickly
in these cases. If the main oscillator or the PLL is needed by the application, software will
need to enable these features and wait for them to stabilize before they are used as a
clock source.
When the main oscillator is initially activated, the wakeup timer allows software to ensure
that the main oscillator is fully functional before the processor uses it as a clock source
and starts to execute instructions. This is important at power-on, all types of Reset, and
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Chapter 4: LPC24XX Clocking and power control
whenever any of the aforementioned functions are turned off for any reason. Since the
oscillator and other functions are turned off during Power-down mode, any wakeup of the
processor from Power-down mode makes use of the Wakeup Timer.
The Wakeup Timer monitors the crystal oscillator as the means of checking whether it is
safe to begin code execution. When power is applied to the chip, or some event caused
the chip to exit Power-down mode, some time is required for the oscillator to produce a
signal of sufficient amplitude to drive the clock logic. The amount of time depends on
many factors, including the rate of VDD(3V3) ramp (in the case of power on), the type of
crystal and its electrical characteristics (if a quartz crystal is used), as well as any other
external circuitry (e.g. capacitors), and the characteristics of the oscillator itself under the
existing ambient conditions.
Once a clock is detected, the Wakeup Timer counts a fixed number of clocks (4096), then
sets the flag (OSCSTAT bit in the SCS register) that indicates that the main oscillator is
ready for use. Software can then switch to the main oscillator and, if needed, start the
PLL. Refer to the Main Oscillator description in this chapter for details.
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Chapter 5: LPC24XX External Memory Controller (EMC)
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User manual
1. How to read this chapter
This chapter describes the external memory controller for all LPC2400 parts. For EMC
Table 64. EMC configuration
Data bus
width/
Pins
SDRAM configuration
registers
Static memory
configuration registers
External
memory
memory
transaction
size
connection
LPC2458 8-bit, 16-bit
A[19:0]
EMCDynamic Config1/0
EMCDynamic RasCas1/0
EMCStatic Config1/0
EMCStatic WaitWen1/0
EMCStatic WaitOen1/0
EMCStatic WaitRd1/0
EMCStatic WaitPage1/0
EMCStatic WaitWr1/0
EMCStatic WaitTurn1/0
D[15:0]
OE, WE
BLS[1:0]
CS[1:0]
DYCS[1:0]
CAS, RAS
CLKOUT[1:0]
CKEOUT[1:0]
DQMOUT[1:0]
A[23:0]
LPC2420, 8-bit, 16-bit,
LPC2460, 32-bit
EMCDynamic
Config3/2/1/0
D[31:0]
EMCStatic
WaitWen3/2/1/0
LPC2468,
LPC2470,
LPC2478
EMCDynamic
RasCas3/2/1/0
OE, WE
EMCStatic
WaitOen3/2/1/0
BLS[3:0]
CS[3:0]
EMCStatic WaitRd3/2/1/0
DYCS[3:0]
CAS, RAS
CLKOUT[1:0]
CKEOUT[3:0]
DQMOUT[3:0]
EMCStatic
WaitPage3/2/1/0
EMCStatic WaitWr3/2/1/0
EMCStatic
WaitTurn3/2/1/0
2. Basic configuration
The EMC is configured using the following registers:
Remark: The EMC is enabled on reset (PCEMC = 1). On POR and warm reset, the
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Chapter 5: LPC24XX External Memory Controller (EMC)
3. Pins: Select data, address, and control pins and their modes in PINSEL6/8/9 and
3. Introduction
The LPC2400 External Memory Controller (EMC) is an ARM PrimeCell™ MultiPort
Memory Controller peripheral offering support for asynchronous static memory devices
such as RAM, ROM and Flash, as well as dynamic memories such as Single Data Rate
SDRAM. The EMC is an Advanced Microcontroller Bus Architecture (AMBA) compliant
peripheral.
4. Features
• Dynamic memory interface support including Single Data Rate SDRAM.
• Asynchronous static memory device support including RAM, ROM, and Flash, with or
without asynchronous page mode.
• Low transaction latency.
• Read and write buffers to reduce latency and to improve performance.
• 8 bit, 16 bit, and 32 bit wide static memory support.
• 16 bit and 32 bit wide chip select SDRAM memory support.
• Static memory features include:
– Asynchronous page mode read
– Programmable wait states
– Bus turnaround delay
– Output enable and write enable delays
– Extended wait
• Four chip selects for synchronous memory and four chip selects for static memory
devices.
• Power-saving modes dynamically control CKE and CLKOUT to SDRAMs.
• Dynamic memory self-refresh mode controlled by software.
• Controller supports 2 kbit, 4 kbit, and 8 kbit row address synchronous memory parts.
That is typical 512 MB, 256 MB, and 128 MB parts, with 4, 8, 16, or 32 data bits per
device.
• Separate reset domains allow the for auto-refresh through a chip reset if desired.
Note: Synchronous static memory devices (synchronous burst mode) are not supported.
5. EMC functional description
Figure 5–15 shows a block diagram of the EMC.
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Chapter 5: LPC24XX External Memory Controller (EMC)
EMC
A[23:0]
shared
signals
D[31:0]
WE
OE
AHB SLAVE
REGISTER
INTERFACE
DATA
BUFFERS
static
memory
signals
BLS[3:0]
CS[3:0]
MEMORY
CONTROLLER
STATE
AHB SLAVE
MEMORY
INTERFACE
DYCS[3:0]
CAS
MACHINE
RAS
dynamic
memory
signals
CLKOUT[1:0]
CKEOUT[3:0]
DQMOUT[3:0]
Fig 15. EMC block diagram
The functions of the EMC blocks are described in the following sections:
• AHB slave register interface.
• AHB slave memory interfaces.
• Data buffers.
• Memory controller state machine.
• Pad interface.
Note: For 32 bit wide chip selects data is transferred to and from dynamic memory in
SDRAM bursts of four. For 16 bit wide chip selects SDRAM bursts of eight are used.
5.1 AHB slave register interface
The AHB slave register interface block enables the registers of the EMC to be
programmed. This module also contains most of the registers and performs the majority of
the register address decoding.
To eliminate the possibility of endianness problems, all data transfers to and from the
registers of the EMC must be 32 bits wide.
Note: If an access is attempted with a size other than a word (32 bits), it causes an
ERROR response to the AHB bus and the transfer is terminated.
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Chapter 5: LPC24XX External Memory Controller (EMC)
5.2 AHB slave memory interface
The AHB slave memory interface allows access to external memories.
5.2.1 Memory transaction endianness
The endianness of the data transfers to and from the external memories is determined by
the Endian mode (N) bit in the EMCConfig register.
Note: The memory controller must be idle (see the busy field of the EMCStatus Register)
before endianness is changed, so that the data is transferred correctly.
5.2.2 Memory transaction size
Memory transactions can be 8, 16, or 32 bits wide. Any access attempted with a size
greater than a word (32 bits) causes an ERROR response to the AHB bus and the transfer
is terminated.
5.2.3 Write protected memory areas
Write transactions to write-protected memory areas generate an ERROR response to the
AHB bus and the transfer is terminated.
5.3 Pad interface
The pad interface block provides the interface to the pads. The pad interface uses
feedback clocks, FBCLKIN[3:0], to resynchronize SDRAM read data from the off-chip to
on-chip domains.
5.4 Data buffers
The AHB interface reads and writes via buffers to improve memory bandwidth and reduce
transaction latency. The EMC contains four 16-word buffers. The buffers can be used as
read buffers, write buffers, or a combination of both. The buffers are allocated
automatically.
The buffers must be disabled during SDRAM and SyncFlash initialization. They must also
be disabled when performing SyncFlash commands. The buffers must be enabled during
normal operation.
The buffers can be enabled or disabled for static memory using the EMCStaticConfig
Registers.
5.4.1 Write buffers
Write buffers are used to:
• Merge write transactions so that the number of external transactions are minimized.
Buffer data until the EMC can complete the write transaction, improving AHB write
latency.
Convert all dynamic memory write transactions into quadword bursts on the external
memory interface. This enhances transfer efficiency for dynamic memory.
• Reduce external memory traffic. This improves memory bandwidth and reduces
power consumption.
Write buffer operation:
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• If the buffers are enabled, an AHB write operation writes into the Least Recently Used
(LRU) buffer, if empty.
If the LRU buffer is not empty, the contents of the buffer are flushed to memory to
make space for the AHB write data.
• If a buffer contains write data it is marked as dirty, and its contents are written to
memory before the buffer can be reallocated.
The write buffers are flushed whenever:
• The memory controller state machine is not busy performing accesses to external
memory.
The memory controller state machine is not busy performing accesses to external
memory, and an AHB interface is writing to a different buffer.
Note: For dynamic memory, the smallest buffer flush is a quadword of data. For static
memory, the smallest buffer flush is a byte of data.
5.4.2 Read buffers
Read buffers are used to:
• Buffer read requests from memory. Future read requests that hit the buffer read the
data from the buffer rather than memory, reducing transaction latency.
Convert all read transactions into quadword bursts on the external memory interface.
This enhances transfer efficiency for dynamic memory.
• Reduce external memory traffic. This improves memory bandwidth and reduces
power consumption.
Read buffer operation:
• If the buffers are enabled and the read data is contained in one of the buffers, the read
data is provided directly from the buffer.
• If the read data is not contained in a buffer, the LRU buffer is selected. If the buffer is
dirty (contains write data), the write data is flushed to memory. When an empty buffer
is available the read command is posted to the memory.
A buffer filled by performing a read from memory is marked as not-dirty (not containing
write data) and its contents are not flushed back to the memory controller unless a
subsequent AHB transfer performs a write that hits the buffer.
5.5 Memory controller state machine
The memory controller state machine comprises a static memory controller and a dynamic
memory controller.
6. Low-power operation
In many systems, the contents of the memory system have to be maintained during
low-power sleep modes. The EMC provides a mechanism to place the dynamic memories
into self-refresh mode.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Self-refresh mode can be entered by software by setting the SREFREQ bit in the
EMCDynamicControl Register and polling the SREFACK bit in the EMCStatus Register.
Any transactions to memory that are generated while the memory controller is in
self-refresh mode are rejected and an error response is generated to the AHB bus.
Clearing the SREFREQ bit in the EMCDynamicControl Register returns the memory to
normal operation. See the memory data sheet for refresh requirements.
Note: The static memory can be accessed as normal when the SDRAM memory is in
self-refresh mode.
6.1 Low-power SDRAM Deep-sleep Mode
The EMC supports JEDEC low-power SDRAM deep-sleep mode. Deep-sleep mode can
be entered by setting the deep-sleep mode (DP) bit, the dynamic memory clock enable bit
(CE), and the dynamic clock control bit (CS) in the EMCDynamicControl register. The
device is then put into a low-power mode where the device is powered down and no
longer refreshed. All data in the memory is lost.
6.2 Low-power SDRAM partial array refresh
The EMC supports JEDEC low-power SDRAM partial array refresh. Partial array refresh
can be programmed by initializing the SDRAM memory device appropriately. When the
memory device is put into self-refresh mode only the memory banks specified are
refreshed. The memory banks that are not refreshed lose their data contents.
7. Memory bank select
Eight independently-configurable memory chip selects are supported:
• Pins CSn3 to CSn0 are used to select static memory devices.
• Pins DYCSn3 to DYCSn0 are used to select dynamic memory devices.
Static memory chip select ranges are each 16 megabytes in size, while dynamic memory
of the chip selects.
Table 65. Memory bank selection
Chip select pin
CS0
Address range
Memory type
Static
Size of range
16 MB
0x8000 0000 - 0x80FF FFFF
0x8100 0000 - 0x81FF FFFF
0x8200 0000 - 0x82FF FFFF
0x8300 0000 - 0x83FF FFFF
0xA000 0000 - 0xAFFF FFFF
0xB000 0000 - 0xBFFF FFFF
0xC000 0000 - 0xCFFF FFFF
0xD000 0000 - 0xDFFF FFFF
CS1
Static
16 MB
CS2
Static
16 MB
CS3
Static
16 MB
DYCS0
DYCS1
DYCS2
DYCS3
Dynamic
Dynamic
Dynamic
Dynamic
256 MB
256 MB
256 MB
256 MB
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Chapter 5: LPC24XX External Memory Controller (EMC)
8. Reset
The EMC receives two reset signals. One is Power-On Reset (POR), asserted when chip
power is applied, and when a brown-out condition is detected (see the System Control
Block chapter for details of Brown-Out Detect). The other reset is from the external Reset
pin and the Watchdog Timer.
A configuration bit in the SCS register, called EMC_Reset_Disable, allows control of how
the EMC is reset. The default configuration (EMC_Reset_Disable = 0) is that both EMC
resets are asserted when any type of reset event occurs. In this mode, all registers and
functions of the EMC are initialized upon any reset condition.
If EMC_Reset_Disable is set to 1, many portions of the EMC are only reset by a power-on
or brown-out event, in order to allow the EMC to retain its state through a warm reset
(external reset or watchdog reset). If the EMC is configured correctly, auto-refresh can be
maintained through a warm reset.
9. Pin description
Table 66. Pad interface and control signal descriptions
Name
Type
Value on POR Value during Description
reset self-refresh
A[23:0]
Output 0x0000 0000 Depends on
External memory address output.
static memory Used for both static and SDRAM
accesses
devices. SDRAM memories use only
bits [14:0].
D[31:0]
Input/ Data outputs = Depends on
External memory data lines. These
Output 0x0000 0000 static memory are inputs when data is read from
accesses
external memory and outputs when
data is written to external memory.
OE
Output 1
Depends on
Low active output enable for static
static memory memory devices.
accesses
BLS[3:0]
WE
Output 0xF
Output 1
Depends on
static memory for static memory devices.
accesses
Low active byte lane selects. Used
Depends on
Low active write enable. Used for
static memory SDRAM and static memories.
accesses
CS[3:0]
Output 0xF
Depends on
Static memory chip selects. Default
static memory active LOW. Used for static memory
accesses
0xF
devices.
DYCS[3:0]
CAS
Output 0xF
Output 1
Output 1
SDRAM chip selects. Used for
SDRAM devices.
1
1
Column address strobe. Used for
SDRAM devices.
RAS
Row address strobe. Used for
SDRAM devices.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 66. Pad interface and control signal descriptions
Name
Type
Value on POR Value during Description
reset self-refresh
CLKOUT[1:0]
Output Follows CCLK Follows CCLK SDRAM clocks. Used for SDRAM
devices.
CKEOUT[3:0]
DQMOUT[3:0]
Output 0xF
0x0
SDRAM clock enables. Used for
SDRAM devices. One is allocated for
each Chip Select.
Output 0xF
0xF
Data mask output to SDRAMs. Used
for SDRAM devices and static
memories.
10. Register description
This chapter describes the EMC registers and provides details required when
Table 67. Summary of EMC registers
Address Register Name
Description
Warm POR Type
Reset Reset
Value Value
0xFFE0 8000 EMCControl
Controls operation of the memory controller.
Provides EMC status information.
0x1
0x3
0x5
0x0
R/W
RO
0xFFE0 8004 EMCStatus
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0xFFE0 8008 EMCConfig
Configures operation of the memory controller
Controls dynamic memory operation.
R/W
0xFFE0 8020 EMCDynamic Control
0xFFE0 8024 EMCDynamic Refresh
0x006 R/W
Configures dynamic memory refresh operation.
0x0
0x0
R/W
R/W
0xFFE0 8028 EMCDynamic ReadConfig Configures the dynamic memory read strategy.
0xFFE0 8030 EMCDynamicRP
0xFFE0 8034 EMCDynamic RAS
0xFFE0 8038 EMCDynamic SREX
0xFFE0 803C EMCDynamic APR
0xFFE0 8040 EMCDynamic DAL
0xFFE0 8044 EMCDynamicWR
0xFFE0 8048 EMCDynamicRC
0xFFE0 804C EMCDynamic RFC
0xFFE0 8050 EMCDynamic XSR
0xFFE0 8054 EMCDynamic RRD
0xFFE0 8058 EMCDynamic MRD
Selects the precharge command period.
Selects the active to precharge command period.
Selects the self-refresh exit time.
0x0F R/W
0xF
0xF
0xF
0xF
0xF
R/W
R/W
R/W
R/W
R/W
Selects the last-data-out to active command time.
Selects the data-in to active command time.
Selects the write recovery time.
Selects the active to active command period.
Selects the auto-refresh period.
0x1F R/W
0x1F R/W
0x1F R/W
Selects the exit self-refresh to active command time.
Selects the active bank A to active bank B latency.
Selects the load mode register to active command time.
0xF
0xF
0x0
R/W
R/W
R/W
0xFFE0 8080 EMCStatic ExtendedWait Selects time for long static memory read and write
transfers.
0xFFE0 8100 EMCDynamic Config0
0xFFE0 8104 EMCDynamic RasCas0
0xFFE0 8120 EMCDynamic Config1
Selects the configuration information for dynamic
memory chip select 0.
-
-
-
0x0
R/W
Selects the RAS and CAS latencies for dynamic memory
chip select 0.
0x303 R/W
0x0 R/W
Selects the configuration information for dynamic
memory chip select 1.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 67. Summary of EMC registers …continued
Address
Register Name
Description
Warm POR Type
Reset Reset
Value Value
[1]
[1]
0xFFE0 8124 EMCDynamic RasCas1
0xFFE0 8140 EMCDynamic Config2
0xFFE0 8144 EMCDynamic RasCas2
0xFFE0 8160 EMCDynamic Config3
0xFFE0 8164 EMCDynamic RasCas3
Selects the RAS and CAS latencies for dynamic memory
chip select 1.
-
0x303 R/W
Selects the configuration information for dynamic
memory chip select 2.
-
-
-
-
0x0
0x303 R/W
0x0 R/W
0x303 R/W
R/W
Selects the RAS and CAS latencies for dynamic memory
chip select 2.
Selects the configuration information for dynamic
memory chip select 3.
Selects the RAS and CAS latencies for dynamic memory
chip select 3.
0xFFE0 8200 EMCStatic Config0
0xFFE0 8204 EMCStatic WaitWen0
0xFFE0 8208 EMCStatic WaitOen0
Selects the memory configuration for static chip select 0. -
0x0
0x0
0x0
R/W
R/W
R/W
Selects the delay from chip select 0 to write enable.
-
-
Selects the delay from chip select 0 or address change,
whichever is later, to output enable.
0xFFE0 820C EMCStatic WaitRd0
0xFFE0 8210 EMCStatic WaitPage0
Selects the delay from chip select 0 to a read access.
-
-
0x1F R/W
0x1F R/W
Selects the delay for asynchronous page mode
sequential accesses for chip select 0.
0xFFE0 8214 EMCStatic WaitWr0
0xFFE0 8218 EMCStatic WaitTurn0
Selects the delay from chip select 0 to a write access.
-
-
0x1F R/W
Selects the number of bus turnaround cycles for chip
select 0.
0xF
R/W
0xFFE0 8220 EMCStatic Config1
0xFFE0 8224 EMCStatic WaitWen1
0xFFE0 8228 EMCStatic WaitOen1
Selects the memory configuration for static chip select 1. -
0x0
0x0
0x0
R/W
R/W
R/W
Selects the delay from chip select 1 to write enable.
-
-
Selects the delay from chip select 1 or address change,
whichever is later, to output enable.
0xFFE0 822C EMCStatic WaitRd1
0xFFE0 8230 EMCStatic WaitPage1
Selects the delay from chip select 1 to a read access.
-
-
0x1F R/W
0x1F R/W
Selects the delay for asynchronous page mode
sequential accesses for chip select 1.
0xFFE0 8234 EMCStatic WaitWr1
0xFFE0 8238 EMCStatic WaitTurn1
Selects the delay from chip select 1 to a write access.
-
-
0x1F R/W
Selects the number of bus turnaround cycles for chip
select 1.
0xF
R/W
0xFFE0 8240 EMCStatic Config2
0xFFE0 8244 EMCStatic WaitWen2
0xFFE0 8248 EMCStatic WaitOen2
Selects the memory configuration for static chip select 2. -
0x0
0x0
0x0
R/W
R/W
R/W
Selects the delay from chip select 2 to write enable.
-
-
Selects the delay from chip select 2 or address change,
whichever is later, to output enable.
0xFFE0 824C EMCStatic WaitRd2
0xFFE0 8250 EMCStatic WaitPage2
Selects the delay from chip select 2 to a read access.
-
-
0x1F R/W
0x1F R/W
Selects the delay for asynchronous page mode
sequential accesses for chip select 2.
0xFFE0 8254 EMCStatic WaitWr2
0xFFE0 8258 EMCStatic WaitTurn2
Selects the delay from chip select 2 to a write access.
-
-
0x1F R/W
Selects the number of bus turnaround cycles for chip
select 2.
0xF
R/W
0xFFE0 8260 EMCStatic Config3
0xFFE0 8264 EMCStatic WaitWen3
Selects the memory configuration for static chip select 3. -
0x0
0x0
R/W
R/W
Selects the delay from chip select 3 to write enable.
-
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 67. Summary of EMC registers …continued
Address
Register Name
Description
Warm POR Type
Reset Reset
Value Value
[1]
[1]
0xFFE0 8268 EMCStatic WaitOen3
Selects the delay from chip select 3 or address change,
whichever is later, to output enable.
-
0x0
R/W
0xFFE0 826C EMCStatic WaitRd3
0xFFE0 8270 EMCStatic WaitPage3
Selects the delay from chip select 3 to a read access.
-
-
0x1F R/W
0x1F R/W
Selects the delay for asynchronous page mode
sequential accesses for chip select 3.
0xFFE0 8274 EMCStatic WaitWr3
0xFFE0 8278 EMCStatic WaitTurn3
Selects the delay from chip select 3 to a write access.
-
-
0x1F R/W
Selects the number of bus turnaround cycles for chip
select 3.
0xF
R/W
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
10.1 EMC Control register (EMCControl - 0xFFE0 8000)
The EMCControl register is a read/write register that controls operation of the memory
bit assignments for the EMCControl register.
Table 68. EMC Control register (EMCControl - address 0xFFE0 8000) bit description
Bit
Symbol
Value Description
Reset
Value
0
EMC Enable (E)
Indicates if the EMC is enabled or disabled:
Disabled
1
0
1
Enabled (POR and warm reset value).
Disabling the EMC reduces power consumption.
When the memory controller is disabled the memory
is not refreshed. The memory controller is enabled by
setting the enable bit, or by reset.
This bit must only be modified when the EMC is in idle
state.[1]
1
Address mirror (M)
Indicates normal or reset memory map:
Normal memory map.
1
0
1
Reset memory map. Static memory CS1 is mirrored
onto CS0 and DYCS0 (POR reset value).
On POR, CS1 is mirrored to both CS0 and DYCS0
memory areas. Clearing the M bit enables CS0 and
DYCS0 memory to be accessed.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 68. EMC Control register (EMCControl - address 0xFFE0 8000) bit description
Bit
Symbol
Value Description
Reset
Value
2
Low-power mode
(L)
Indicates normal, or low-power mode:
0
0
1
Normal mode (warm reset value).
Low-power mode.
Entering low-power mode reduces memory controller
power consumption. Dynamic memory is refreshed as
necessary. The memory controller returns to normal
functional mode by clearing the low-power mode bit
(L), or by POR.
This bit must only be modified when the EMC is in idle
state.[1]
31:3
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
[1] The external memory cannot be accessed in low-power or disabled state. If a memory access is performed
an AHB error response is generated. The EMC registers can be programmed in low-power and/or disabled
state.
10.2 EMC Status register (EMCStatus - 0xFFE0 8004)
the bit assignments for the EMCStatus register.
Table 69. EMC Status register (EMCStatus - address 0xFFE0 8008) bit description
Bit
Symbol
Value
Description
Reset
Value
0
Busy (B)
This bit is used to ensure that the memory controller
enters the low-power or disabled mode cleanly by
determining if the memory controller is busy or not:
1
0
1
EMC is idle (warm reset value).
EMC is busy performing memory transactions,
commands, auto-refresh cycles, or is in self-refresh
mode (POR reset value).
1
Write buffer
status (S)
This bit enables the EMC to enter low-power mode
or disabled mode cleanly:
0
0
1
Write buffers empty (POR reset value)
Write buffers contain data.
2
Self-refresh
acknowledge
(SA)
This bit indicates the operating mode of the EMC:
Normal mode
1
0
1
-
Self-refresh mode (POR reset value).
31:3
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
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Chapter 5: LPC24XX External Memory Controller (EMC)
10.3 EMC Configuration register (EMCConfig - 0xFFE0 8008)
The EMCConfig register configures the operation of the memory controller. It is
recommended that this register is modified during system initialization, or when there are
no current or outstanding transactions. This can be ensured by waiting until the EMC is
idle, and then entering low-power, or disabled mode. This register is accessed with one
Table 70. EMC Configuration register (EMCConfig - address 0xFFE0 8008) bit description
Bit Symbol
Value Description
Reset
Value
0
Endian mode:
0
0
1
Little-endian mode (POR reset value).
Big-endian mode.
On power-on reset, the value of the endian bit is 0. All
data must be flushed in the EMC before switching
between little-endian and big-endian modes.
7:1
8
-
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
CCLK : CLKOUT[1:0] ratio:
0
0
1
1:1 (POR reset value)
1:2 (this option is not available on the LPC2400)
This bit must contain 0 for proper operation of the EMC.
31:9 -
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
10.4 Dynamic Memory Control register (EMCDynamicControl -
0xFFE0 8020)
The EMCDynamicControl register controls dynamic memory operation. The control bits
EMCDynamicControl register.
Table 71. Dynamic Control register (EMCDynamicControl - address 0xFFE0 8020) bit
description
Bit
Symbol
Value Description
Reset
Value
0
Dynamic
memory clock
enable (CE)
0
Clock enable of idle devices are deasserted to save
power (POR reset value).
All clock enables are driven HIGH continuously.[1]
0
1
1
0
1
Dynamic
memory clock
control (CS)
CLKOUT stops when all SDRAMs are idle and during
self-refresh mode.
1
CLKOUT runs continuously (POR reset value).
When clock control is LOW the output clock CLKOUT is
stopped when there are no SDRAM transactions. The
clock is also stopped during self-refresh mode.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 71. Dynamic Control register (EMCDynamicControl - address 0xFFE0 8020) bit
description
Bit
Symbol
Value Description
Reset
Value
2
Self-refresh
request,
EMCSREFREQ
(SR)
0
1
Normal mode.
1
Enter self-refresh mode (POR reset value).
By writing 1 to this bit self-refresh can be entered under
software control. Writing 0 to this bit returns the EMC to
normal mode.
The self-refresh acknowledge bit in the EMCStatus
register must be polled to discover the current operating
mode of the EMC.[2]
4:3
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
5
6
Memory clock
control (MMC)
0
1
-
CLKOUT enabled (POR reset value).
CLKOUT disabled.[3]
0
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
8:7
SDRAM
initialization (I)
00
Issue SDRAM NORMAL operation command (POR
reset value).
00
01
10
11
-
Issue SDRAM MODE command.
Issue SDRAM PALL (precharge all) command.
Issue SDRAM NOP (no operation) command)
12:9
13
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
0
Low-power
SDRAM
deep-sleep
mode (DP)
0
1
Normal operation (POR reset value).
Enter deep power down mode.
31:14
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
[1] Clock enable must be HIGH during SDRAM initialization.
[2] The memory controller exits from power-on reset with the self-refresh bit HIGH. To enter normal functional
mode set this bit LOW.
[3] Disabling CLKOUT can be performed if there are no SDRAM memory transactions. When enabled this bit
can be used in conjunction with the dynamic memory clock control (CS) field.
Remark: Deep-sleep mode can be entered by setting the deep-sleep mode (DP) bit, the
dynamic memory clock enable bit (CE), and the dynamic clock control bit (CS) to one. The
device is then put into a low-power mode where the device is powered down and no
longer refreshed. All data in the memory is lost.
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Chapter 5: LPC24XX External Memory Controller (EMC)
10.5 Dynamic Memory Refresh Timer register (EMCDynamicRefresh -
0xFFE0 8024)
The EMCDynamicRefresh register configures dynamic memory operation. It is
recommended that this register is modified during system initialization, or when there are
no current or outstanding transactions. This can be ensured by waiting until the EMC is
idle, and then entering low-power, or disabled mode. However, these control bits can, if
necessary, be altered during normal operation. This register is accessed with one wait
state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
assignments for the EMCDynamicRefresh register.
Table 72. Dynamic Memory Refresh Timer register (EMCDynamicRefresh - address
0xFFE0 8024) bit description
Bit
Symbol
Value Description
Reset
Value
10:0 Refresh timer
(REFRESH)
Indicates the multiple of 16 CCLKs between SDRAM
refresh cycles.
0
0x0
0x1
Refresh disabled (POR reset value).
0x7FF = n x16 = 16n CCLKs between SDRAM refresh
cycles.
For example:
0x1 = 1 x 16 = 16 CCLKs between SDRAM refresh
cycles.
0x8 = 8 x 16 = 128 CCLKs between SDRAM refresh
cycles.
31:11
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
For example, for the refresh period of 16 µs, and a CCLK frequency of 50 MHz, the
following value must be programmed into this register:
(16 x 10-6 x 50 x 106) / 16 = 50 or 0x32
If auto-refresh through warm reset is requested (by setting the EMC_Reset_Disable bit),
the timing of auto-refresh must be adjusted to allow a sufficient refresh rate when the
clock rate is reduced during the wakeup period of a reset cycle. During this period, the
EMC (and all other portions of the LPC2400 that are being clocked) run from the IRC
oscillator at 4 MHz. So, 4 MHz must be considered the CCLK rate for refresh calculations
if auto-refresh through warm reset is requested.
Note: The refresh cycles are evenly distributed. However, there might be slight variations
when the auto-refresh command is issued depending on the status of the memory
controller.
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Chapter 5: LPC24XX External Memory Controller (EMC)
10.6 Dynamic Memory Read Configuration register
(EMCDynamicReadConfig - 0xFFE0 8028)
The EMCDynamicReadConfig register configures the dynamic memory read strategy.
This register must only be modified during system initialization. This register is accessed
with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
Important: Especially it should be highlighted that the default clock delay methodology
requires the output clock to be delayed externally to the chip to avoid hold time issue for
the SDRAM. In most application boards, there will be no such external delay circuit and
the application should write correct value to the EMCDynamicReadConfig register to use
Command Delay Strategy. The Clock Delay Strategy is the default setting on reset!
Table 73. Dynamic Memory Read Configuration register (EMCDynamicReadConfig -
address 0xFFE0 8028) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
Read data
strategy (RD)
00
01
10
Clock out delayed strategy, using CLKOUT (command
not delayed, clock out delayed). POR reset value.
0x0
Command delayed strategy, using EMCCLKDELAY
(command delayed, clock out not delayed).
Command delayed strategy plus one clock cycle, using
EMCCLKDELAY (command delayed, clock out not
delayed).
11
-
Command delayed strategy plus two clock cycles, using
EMCCLKDELAY (command delayed, clock out not
delayed).
31:2
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.7 Dynamic Memory Percentage Command Period register
(EMCDynamictRP - 0xFFE0 8030)
The EMCDynamicTRP register enables you to program the precharge command period,
tRP. This register must only be modified during system initialization. This value is normally
found in SDRAM data sheets as tRP. This register is accessed with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 74. Dynamic Memory Percentage Command Period register (EMCDynamictRP -
address 0xFFE0 8030) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Precharge
command
period (tRP)
0x0 - n + 1 clock cycles. The delay is in EMCCLK cycles.
0xE
0x0F
0xF
-
16 clock cycles (POR reset value).
31:4
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.8 Dynamic Memory Active to Precharge Command Period register
(EMCDynamictRAS - 0xFFE0 8034)
The EMCDynamicTRAS register enables you to program the active to precharge
command period, tRAS. It is recommended that this register is modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode.
This value is normally found in SDRAM data sheets as tRAS. This register is accessed
with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
Table 75. Dynamic Memory Active to Precharge Command Period register
(EMCDynamictRAS - address 0xFFE0 8034) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Active to
0x0 - n + 1 clock cycles. The delay is in EMCCLK cycles.
0xE
0xF
precharge
command
period (tRAS)
0xF
16 clock cycles (POR reset value).
31:4
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.9 Dynamic Memory Self-refresh Exit Time register (EMCDynamictSREX
- 0xFFE0 8038)
The EMCDynamicTSREX register enables you to program the self-refresh exit time,
tSREX. It is recommended that this register is modified during system initialization, or
when there are no current or outstanding transactions. This can be ensured by waiting
until the EMC is idle, and then entering low-power, or disabled mode. This value is
normally found in SDRAM data sheets as tSREX, for devices without this parameter you
use the same value as tXSR. This register is accessed with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selectsmust be programmed.
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Table 76. Dynamic Memory Self-refresh Exit Time register (EMCDynamictSREX - address
0xFFE0 8038) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Self-refresh exit 0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0xF
time (tSREX)
-
0xE
0xF
-
16 clock cycles (POR reset value).
31:4
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.10 Dynamic Memory Last Data Out to Active Time register
(EMCDynamictAPR - 0xFFE0 803C)
The EMCDynamicTAPR register enables you to program the last-data-out to active
command time, tAPR. It is recommended that this register is modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode.
This value is normally found in SDRAM data sheets as tAPR. This register is accessed
with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selectsmust be programmed.
Table 77. Memory Last Data Out to Active Time register (EMCDynamictAPR - address
0xFFE0 803C) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Last-data-out to 0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0xF
NA
active command 0xE
time (tAPR)
0xF
-
16 clock cycles (POR reset value).
31:4
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
10.11 Dynamic Memory Data-in to Active Command Time register
(EMCDynamictDAL - 0xFFE0 8040)
The EMCDynamicTDAL register enables you to program the data-in to active command
time, tDAL. It is recommended that this register is modified during system initialization, or
when there are no current or outstanding transactions. This can be ensured by waiting
until the EMC is idle, and then entering low-power, or disabled mode. This value is
normally found in SDRAM data sheets as tDAL, or tAPW. This register is accessed with
one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
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Table 78. Dynamic Memory Data-in to Active Command Time register (EMCDynamictDAL -
address 0xFFE0 8040) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Data-in to active 0x0 - n clock cycles. The delay is in CCLK cycles.
0xF
command
(tDAL)
0xE
0xF
-
15 clock cycles (POR reset value).
31:4
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.12 Dynamic Memory Write Recovery Time register (EMCDynamictWR -
0xFFE0 8044)
The EMCDynamicTWR register enables you to program the write recovery time, tWR. It is
recommended that this register is modified during system initialization, or when there are
no current or outstanding transactions. This can be ensured by waiting until the EMC is
idle, and then entering low-power, or disabled mode. This value is normally found in
SDRAM data sheets as tWR, tDPL, tRWL, or tRDL. This register is accessed with one
wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
Table 79. Dynamic Memory Write recover Time register (EMCDynamictWR - address
0xFFE0 8044) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Write recovery
time (tWR)
0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0xE
0xF
0xF
-
16 clock cycles (POR reset value).
31:4
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.13 Dynamic Memory Active to Active Command Period register
(EMCDynamictRC - 0xFFE0 8048)
The EMCDynamicTRC register enables you to program the active to active command
period, tRC. It is recommended that this register is modified during system initialization, or
when there are no current or outstanding transactions. This can be ensured by waiting
until the EMC is idle, and then entering low-power, or disabled mode. This value is
normally found in SDRAM data sheets as tRC. This register is accessed with one wait
state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
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Table 80. Dynamic Mempry Active to Active Command Period register (EMCDynamictRC -
address 0xFFE0 8048) bit description
Bit
Symbol
Value Description
Reset
Value
4:0
Active to active 0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0x1F
command
period (tRC)
0x1E
0xF
-
32 clock cycles (POR reset value).
31:5
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.14 Dynamic Memory Auto-refresh Period register (EMCDynamictRFC -
0xFFE0 804C)
The EMCDynamicTRFC register enables you to program the auto-refresh period, and
auto-refresh to active command period, tRFC. It is recommended that this register is
modified during system initialization, or when there are no current or outstanding
transactions. This can be ensured by waiting until the EMC is idle, and then entering
low-power, or disabled mode. This value is normally found in SDRAM data sheets as
tRFC, or sometimes as tRC. This register is accessed with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
Table 81. Dynamic Memory Auto-refresh Period register (EMCDynamictRFC - address
0xFFE0 804C) bit description
Bit
Symbol
Value Description
Reset
Value
4:0
Auto-refresh
period and
0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0x1E
0x1F
auto-refresh to
active command
period (tRFC)
0xF
32 clock cycles (POR reset value).
31:5
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.15 Dynamic Memory Exit Self-refresh register (EMCDynamictXSR -
0xFFE0 8050)
The EMCDynamicTXSR register enables you to program the exit self-refresh to active
command time, tXSR. It is recommended that this register is modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode.
This value is normally found in SDRAM data sheets as tXSR. This register is accessed
with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
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Table 82. Dynamic Memory Exit Self-refresh register (EMCDynamictXSR - address
0xFFE0 8050) bit description
Bit
Symbol
Value Description
Reset
Value
4:0
Exit self-refresh 0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0x1F
to active
command time
(tXSR)
0x1E
0xF
32 clock cycles (POR reset value).
31:5
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.16 Dynamic Memory Active Bank A to Active Bank B Time register
(EMCDynamictRRD - 0xFFE0 8054)
The EMCDynamicTRRD register enables you to program the active bank A to active bank
B latency, tRRD. It is recommended that this register is modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode.
This value is normally found in SDRAM data sheets as tRRD. This register is accessed
with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selects must be programmed.
Table 83. Dynamic Memory Acitve Bank A to Active Bank B Time register
(EMCDynamictRRD - address 0xFFE0 8054) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Active bank A to 0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0xF
active bank B
latency (tRRD )
0xE
0xF
-
16 clock cycles (POR reset value).
31:4
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.17 Dynamic Memory Load Mode register to Active Command Time
(EMCDynamictMRD - 0xFFE0 8058)
The EMCDynamicTMRD register enables you to program the load mode register to active
command time, tMRD. It is recommended that this register is modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode.
This value is normally found in SDRAM data sheets as tMRD, or tRSA. This register is
accessed with one wait state.
Note: This register is used for all four dynamic memory chip selects. Therefore the worst
case value for all of the chip selectsmust be programmed.
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Table 84. Dynamic Memory Load Mode register to Active Command Time
(EMCDynamictMRD - address 0xFFE0 8058) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Load mode
0x0 - n + 1 clock cycles. The delay is in CCLK cycles.
0xF
register to active 0xE
command time
(tMRD)
0xF
16 clock cycles (POR reset value).
31:4
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.18 Static Memory Extended Wait register (EMCStaticExtendedWait -
0xFFE0 8080)
ExtendedWait (EW) bit in the EMCStaticConfig register is set. It is recommended that this
register is modified during system initialization, or when there are no current or
outstanding transactions. However, if necessary, these control bits can be altered during
normal operation. This register is accessed with one wait state.
Table 85. Static Memory Extended Wait register (EMCStaticExtendedWait - address
0xFFE0 8080) bit description
Bit
Symbol
Value Description
Reset
Value
9:0
Extended wait time 0x0
out
16 clock cycles (POR reset value). The delay is in
CCLK cycles.
(EXTENDEDWAIT)
0x1
(n+1) x16 clock cycles.
31:10 -
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
For example, for a static memory read/write transfer time of 16 µs, and a CCLK frequency
of 50 MHz, the following value must be programmed into this register: (16 x 10-6 x 50 x
106) / 16 - 1 = 49
10.19 Dynamic Memory Configuration registers (EMCDynamicConfig0-3 -
0xFFE0 8100, 120, 140, 160)
The EMCDynamicConfig0-3 registers enable you to program the configuration information
for the relevant dynamic memory chip select. These registers are normally only modified
during system initialization. These registers are accessed with one wait state.
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Table 86. Dynamic Memory Configuration registers (EMCDynamicConfig0-3 - address
0xFFE0 8100, 0xFFE0 8120, 0xFFE0 8140, 0xFFE0 8160) bit description
Bit
Symbol
Value Description
Reset
Value
2:0
-
-
Reserved, user software should not write ones to
NA
reserved bits. The value read from a reserved bit is not
defined.
4:3
6:5
Memory device 00
SDRAM (POR reset value).
Low-power SDRAM.
Micron SyncFlash.
Reserved.
00
(MD)
01
10
11
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
12:7 Address
mapping (AM)
000000 = reset value.[1]
0
0
-
13
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
14
Address
mapping (AM)
0 = reset value.
0
0
-
18:15 -
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
19
20
Buffer enable
(B)
0
1
Buffer disabled for accesses to this chip select (POR
reset value).
Buffer enabled for accesses to this chip select.[2]
Writes not protected (POR reset value).
Writes protected.
Write protect (P) 0
1
0
31:21 -
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
[1] The SDRAM column and row width and number of banks are computed automatically from the address
mapping.
[2] The buffers must be disabled during SDRAM and SyncFlash initialization. They must also be disabled when
performing SyncFlash commands. The buffers must be enabled during normal operation.
Table 87. Address mapping
14 12 11:9 8:7 Description
16 bit external bus high-performance address mapping (Row, Bank, Column)
0
0
0
0
0
0
0
0
0
0
0
0
000 00
000 01
001 00
001 01
010 00
010 01
16 MB (2Mx8), 2 banks, row length = 11, column length = 9
16 MB (1Mx16), 2 banks, row length = 11, column length = 8
64 MB (8Mx8), 4 banks, row length = 12, column length = 9
64 MB (4Mx16), 4 banks, row length = 12, column length = 8
128 MB (16Mx8), 4 banks, row length = 12, column length = 10
128 MB (8Mx16), 4 banks, row length = 12, column length = 9
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Table 87. Address mapping
14 12 11:9 8:7 Description
0
0
0
0
0
0
0
0
011 00
011 01
100 00
100 01
256 MB (32Mx8), 4 banks, row length = 13, column length = 10
256 MB (16Mx16), 4 banks, row length = 13, column length = 9
512 MB (64Mx8), 4 banks, row length = 13, column length = 11
512 MB (32Mx16), 4 banks, row length = 13, column length = 10
16 bit external bus low-power SDRAM address mapping (Bank, Row, Column)
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
000 00
000 01
001 00
001 01
010 00
010 01
011 00
011 01
100 00
100 01
16 MB (2Mx8), 2 banks, row length = 11, column length = 9
16 MB (1Mx16), 2 banks, row length = 11, column length = 8
64 MB (8Mx8), 4 banks, row length = 12, column length = 9
64 MB (4Mx16), 4 banks, row length = 12, column length = 8
128 MB (16Mx8), 4 banks, row length = 12, column length = 10
128 MB (8Mx16), 4 banks, row length = 12, column length = 9
256 MB (32Mx8), 4 banks, row length = 13, column length = 10
256 MB (16Mx16), 4 banks, row length = 13, column length = 9
512 MB (64Mx8), 4 banks, row length = 13, column length = 11
512 MB (32Mx16), 4 banks, row length = 13, column length = 10
32 bit external bus high-performance address mapping (Row, Bank, Column)
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
000 00
000 01
001 00
001 01
001 10
010 00
010 01
010 10
011 00
011 01
011 10
100 00
100 01
16 MB (2Mx8), 2 banks, row length = 11, column length = 9
16 MB (1Mx16), 2 banks, row length = 11, column length = 8
64 MB (8Mx8), 4 banks, row length = 12, column length = 9
64 MB (4Mx16), 4 banks, row length = 12, column length = 8
64 MB (2Mx32), 4 banks, row length = 11, column length = 8
128 MB (16Mx8), 4 banks, row length = 12, column length = 10
128 MB (8Mx16), 4 banks, row length = 12, column length = 9
128 MB (4Mx32), 4 banks, row length = 12, column length = 8
256 MB (32Mx8), 4 banks, row length = 13, column length = 10
256 MB (16Mx16), 4 banks, row length = 13, column length = 9
256 MB (8Mx32), 4 banks, row length = 13, column length = 8
512 MB (64Mx8), 4 banks, row length = 13, column length = 11
512 MB (32Mx16), 4 banks, row length = 13, column length = 10
32 bit external bus low-power SDRAM address mapping (Bank, Row, Column)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
000 00
000 01
001 00
001 01
001 10
010 00
010 01
010 10
011 00
011 01
16 MB (2Mx8), 2 banks, row length = 11, column length = 9
16 MB (1Mx16), 2 banks, row length = 11, column length = 8
64 MB (8Mx8), 4 banks, row length = 12, column length = 9
64 MB (4Mx16), 4 banks, row length = 12, column length = 8
64 MB (2Mx32), 4 banks, row length = 11, column length = 8
128 MB (16Mx8), 4 banks, row length = 12, column length = 10
128 MB (8Mx16), 4 banks, row length = 12, column length = 9
128 MB (4Mx32), 4 banks, row length = 12, column length = 8
256 MB (32Mx8), 4 banks, row length = 13, column length = 10
256 MB (16Mx16), 4 banks, row length = 13, column length = 9
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 87. Address mapping
14 12 11:9 8:7 Description
1
1
1
1
1
1
011 10
100 00
100 01
256 MB (8Mx32), 4 banks, row length = 13, column length = 8
512 MB (64Mx8), 4 banks, row length = 13, column length = 11
512 MB (32Mx16), 4 banks, row length = 13, column length = 10
A chip select can be connected to a single memory device, in this case the chip select
data bus width is the same as the device width. Alternatively the chip select can be
connected to a number of external devices. In this case the chip select data bus width is
the sum of the memory device data bus widths.
For example, for a chip select connected to:
• A 32 bit wide memory device, choose a 32 bit wide address mapping.
• A 16 bit wide memory device, choose a 16 bit wide address mapping.
• Four x 8 bit wide memory devices, choose a 32 bit wide address mapping.
• Two x 8 bit wide memory devices, choose a 16 bit wide address mapping.
10.20 Dynamic Memory RAS & CAS Delay registers
(EMCDynamicRASCAS0-3 - 0xFFE0 8104, 124, 144, 164)
The EMCDynamicRasCas0-3 registers enable you to program the RAS and CAS
latencies for the relevant dynamic memory. It is recommended that these registers are
modified during system initialization, or when there are no current or outstanding
transactions. This can be ensured by waiting until the EMC is idle, and then entering
low-power, or disabled mode. These registers are accessed with one wait state.
Note: The values programmed into these registers must be consistent with the values
used to initialize the SDRAM memory device.
Table 88. Dynamic Memory RAS & CAS Delay registers (EMCDynamicRasCas0-3 - address
0xFFE0 8104, 0xFFE0 8124, 0xFFE0 8144, 0xFFE0 8164) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
RAS latency
(active to
read/write
00
01
10
11
-
Reserved.
11
One CCLK cycle.
Two CCLK cycles.
delay) (RAS)
Three CCLK cycles (POR reset value).
7:2
9:8
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
11
CAS latency
(CAS)
00
01
10
11
-
Reserved.
One CCLK cycle.
Two CCLK cycles.
Three CCLK cycles (POR reset value).
31:10 -
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
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10.21 Static Memory Configuration registers (EMCStaticConfig0-3 -
0xFFE0 8200, 220, 240, 260)
The EMCStaticConfig0-3 registers configure the static memory configuration. It is
recommended that these registers are modified during system initialization, or when there
are no current or outstanding transactions. This can be ensured by waiting until the EMC
is idle, and then entering low-power, or disabled mode. These registers are accessed with
one wait state.
synchronous burst mode memory devices are not supported.
Table 89. Static Memory Configuration registers (EMCStaticConfig0-3 - address
0xFFE0 8200, 0xFFE0 8220, 0xFFE0 8240, 0xFFE0 8260) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
Memory width
(MW)
00
01
10
11
-
8 bit (POR reset value).
0
16 bit.
32 bit.
Reserved.
2
3
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
0
Page mode
(PM)
In page mode the EMC can burst up to four external
accesses. Therefore devices with asynchronous page
mode burst four or higher devices are supported.
Asynchronous page mode burst two devices are not
supported and must be accessed normally.
0
1
-
Disabled (POR reset value).
Async page mode enabled (page length four).
5:4
6
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
0
Chip select
polarity (PC)
The value of the chip select polarity on power-on reset is
0.
0
1
Active LOW chip select.
Active HIGH chip select.
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Table 89. Static Memory Configuration registers (EMCStaticConfig0-3 - address
0xFFE0 8200, 0xFFE0 8220, 0xFFE0 8240, 0xFFE0 8260) bit description
Bit
Symbol
Value Description
Reset
Value
7
Byte lane state
(PB)
The byte lane state bit, PB, enables different types of
0
memory to be connected. For byte-wide static memories
the BLSn[3:0] signal from the EMC is usually connected
to WE (write enable). In this case for reads all the
BLSn[3:0] bits must be HIGH. This means that the byte
lane state (PB) bit must be LOW.
16 bit wide static memory devices usually have the
BLSn[3:0] signals connected to the UBn and LBn (upper
byte and lower byte) signals in the static memory. In this
case a write to a particular byte must assert the
appropriate UBn or LBn signal LOW. For reads, all the
UB and LB signals must be asserted LOW so that the
bus is driven. In this case the byte lane state (PB) bit
must be HIGH.
0
1
For reads all the bits in BLSn[3:0] are HIGH. For writes
the respective active bits in BLSn[3:0] are LOW (POR
reset value).
For reads the respective active bits in BLSn[3:0] are
LOW. For writes the respective active bits in BLSn[3:0]
are LOW.
8
Extended wait
(EW)
Extended wait (EW) uses the EMCStaticExtendedWait
register to time both the read and write transfers rather
than the EMCStaticWaitRd and EMCStaticWaitWr
registers. This enables much longer transactions.[1]
0
0
1
-
Extended wait disabled (POR reset value).
Extended wait enabled.
18:9
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
19
20
Buffer enable[2]
(B)
0
1
Buffer disabled (POR reset value).
Buffer enabled.
0
Write protect (P) 0
1
Writes not protected (POR reset value).
Write protected.
0
31:21 -
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
[1] Extended wait and page mode cannot be selected simultaneously.
[2] EMC may perform burst read access even when the buffer enable bit is cleared.
10.22 Static Memory Write Enable Delay registers (EMCStaticWaitWen0-3 -
0xFFE0 8204, 224, 244 ,264)
The EMCStaticWaitWen0-3 registers enable you to program the delay from the chip select
to the write enable. It is recommended that these registers are modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode.
These registers are accessed with one wait state.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 90. Static Memory Write Enable Delay registers (EMCStaticWaitWen0-3 - address
0xFFE0 8204,0xFFE0 8224, 0xFFE0 8244, 0xFFE0 8264) bit description
Bit
Symbol
Value
Description
Reset
Value
3:0
Wait write
enable
(WAITWEN)
Delay from chip select assertion to write enable.
0x0
0x0
One CCLK cycle delay between assertion of chip select
and write enable (POR reset value).
0x1 - 0xF (n + 1) CCLK cycle delay. The delay is (WAITWEN +1) x
tCCLK.
31:4
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.23 Static Memory Output Enable Delay registers (EMCStaticWaitOen0-3 -
0xFFE0 8208, 228, 248, 268)
The EMCStaticWaitOen0-3 registers enable you to program the delay from the chip select
or address change, whichever is later, to the output enable. It is recommended that these
registers are modified during system initialization, or when there are no current or
outstanding transactions. This can be ensured by waiting until the EMC is idle, and then
entering low-power, or disabled mode. These registers are accessed with one wait state.
Table 91. Static Memory Output Enable delay registers (EMCStaticWaitOen03 - address
0xFFE0 8208, 0xFFE0 8228, 0xFFE0 8248, 0xFFE0 8268) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Wait output
enable
(WAITOEN)
Delay from chip select assertion to output enable.
No delay (POR reset value).
0x0
0x0
0x1 - n cycle delay. The delay is WAITOEN x tCCLK.
0xF
31:4
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.24 Static Memory Read Delay registers (EMCStaticWaitRd0-3 -
0xFFE0 820C, 22C, 24C, 26C)
The EMCStaticWaitRd0-3 registers enable you to program the delay from the chip select
to the read access. It is recommended that these registers are modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode. It
is not used if the extended wait bit is enabled in the EMCStaticConfig0-3 registers. These
registers are accessed with one wait state.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 92. Static Memory Read Delay registers (EMCStaticWaitRd0-3 - address 0xFFE0 820C,
0xFFE0 822C, 0xFFE0 824C, 0xFFE0 826C) bit description
Bit
Symbol
Value Description
Reset
Value
4:0
Non-page mode
read wait states
or asynchronous
page mode
readfirst access
wait state
Non-page mode read or asynchronous page mode read, 0x1F
first read only:
0x0 - (n + 1) CCLK cycles for read accesses. For
0x1E non-sequential reads, the wait state time is (WAITRD +
1) x tCCLK.
0x1F 32 CCLK cycles for read accesses (POR reset value).
(WAITRD)
31:5
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.25 Static Memory Page Mode Read Delay registers
(EMCStaticwaitPage0-3 - 0xFFE0 8210, 230, 250, 270)
The EMCStaticWaitPage0-3 registers enable you to program the delay for asynchronous
page mode sequential accesses. It is recommended that these registers are modified
during system initialization, or when there are no current or outstanding transactions. This
can be ensured by waiting until the EMC is idle, and then entering low-power, or disabled
mode. This register is accessed with one wait state.
Table 93. Static Memory Page Mode Read Delay registers0-3 (EMCStaticWaitPage0-3 -
address 0xFFE0 8210, 0xFFE0 8230, 0xFFE0 8250, 0xFFE0 8270) bit description
Bit
Symbol
Value Description
Reset
Value
4:0
Asynchronous
page mode read
after the first
read wait states
(WAITPAGE)
Number of wait states for asynchronous page mode read 0x1F
accesses after the first read:
0x0 - (n+ 1) CCLK cycle read access time. For asynchronous
0x1E page mode read for sequential reads, the wait state time
for page mode accesses after the first read is
(WAITPAGE + 1) x tCCLK.
0x1F 32 CCLK cycle read access time (POR reset value).
31:5
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.26 Static Memory Write Delay registers (EMCStaticWaitwr0-3 -
0xFFE0 8214, 234, 254, 274)
The EMCStaticWaitWr0-3 registers enable you to program the delay from the chip select
to the write access. It is recommended that these registers are modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled
mode.These registers are not used if the extended wait (EW) bit is enabled in the
EMCStaticConfig register. These registers are accessed with one wait state.
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Chapter 5: LPC24XX External Memory Controller (EMC)
Table 94. Static Memory Write Delay registers0-3 (EMCStaticWaitWr - address 0xFFE0 8214,
0xFFE0 8234, 0xFFE0 8254, 0xFFE0 8274) bit description
Bit
Symbol
Value Description
Reset
Value
4:0
Write wait states
(WAITWR)
SRAM wait state time for write accesses after the first
read:
0x1F
0x0 - (n + 2) CCLK cycle write access time. The wait state time
0x1E for write accesses after the first read is WAITWR (n + 2) x
tCCLK.
0x1F 33 CCLK cycle write access time (POR reset value).
31:5
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
10.27 Static Memory Turn Round Delay registers (EMCStaticWaitTurn0-3 -
0xFFE0 8218, 238, 258, 278)
The EMCStaticWaitTurn0-3 registers enable you to program the number of bus
turnaround cycles. It is recommended that these registers are modified during system
initialization, or when there are no current or outstanding transactions. This can be
ensured by waiting until the EMC is idle, and then entering low-power, or disabled mode.
These registers are accessed with one wait state.
Table 95. Static Memory Trun Round Delay registers0-3 (EMCStaticWaitTurn0-3 - address
0xFFE0 8218, 0xFFE0 8238, 0xFFE0 8258, 0xFFE0 8278) bit description
Bit
Symbol
Value Description
Reset
Value
3:0
Bus turnaround 0x0 - (n + 1) CCLK turnaround cycles. Bus turnaround time is 0xF
cycles
(WAITTURN)
0xE
0xF
-
(WAITTURN + 1) x tCCLK.
16 CCLK turnaround cycles (POR reset value).
31:4
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
To prevent bus contention on the external memory data bus, the WAITTURN field controls
the number of bus turnaround cycles added between static memory read and write
accesses. The WAITTURN field also controls the number of turnaround cycles between
static memory and dynamic memory accesses.
11. External memory interface
External memory interfacing depends on the bank width (32, 16 or 8 bit selected via MW
bits in corresponding EMCStaticConfig register).
If a memory bank is configured to be 32 bits wide, address lines A0 and A1 can be used
as non-address lines. If a memory bank is configured to 16 bits wide, A0 is not required.
However, 8 bit wide memory banks do require all address lines down to A0. Configuring
A1 and/or A0 line(s) to provide address or non-address function is accomplished using the
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Chapter 5: LPC24XX External Memory Controller (EMC)
Symbol "a_b" in the following figures refers to the highest order address line in the data
bus. Symbol "a_m" refers to the highest order address line of the memory chip used in the
external memory interface.
If the external memory is used as external boot memory for flashless devices, refer to
Section 8–6 on how to connect the EMC. The memory bank width for memory banks 1
and 2 is determined by the setting of the two BOOT1/0 pins.
11.1 32-bit wide memory bank connection
CS
OE
CE
OE
WE
CE
OE
WE
CE
OE
WE
CE
OE
WE
BLS[3]
BLS[2]
BLS[1]
D[15:8]
BLS[0]
D[7:0]
IO[7:0]
A[a_m:0]
IO[7:0]
A[a_m:0]
IO[7:0]
A[a_m:0]
IO[7:0]
A[a_m:0]
D[31:24]
D[23:16]
A[a_b:2]
a. 32 bit wide memory bank interfaced to four 8 bit memory chips
CS
OE
WE
CE
OE
WE
UB
LB
CE
OE
WE
UB
LB
BLS[3]
BLS[2]
BLS[1]
BLS[0]
IO[15:0]
A[a_m:0]
IO[15:0]
A[a_m:0]
D[31:16]
D[15:0]
A[a_b:2]
b. 32 bit wide memory bank interfaced to two 16 bit memory chips
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Chapter 5: LPC24XX External Memory Controller (EMC)
CS
OE
WE
CE
OE
WE
B3
B2
B1
B0
BLS[3]
BLS[2]
BLS[1]
BLS[0]
IO[31:0]
A[a_m:0]
D[31:0]
A[a_b:2]
c. 32 bit wide memory bank interfaced to one 8 bit memory chip
Fig 16. 32 bit bank external memory interfaces ( bits MW = 10)
11.2 16-bit wide memory bank connection
CS
OE
CE
OE
WE
CE
OE
WE
BLS[1]
D[15:8]
BLS[0]
D[7:0]
IO[7:0]
IO[7:0]
A[a_m:0]
A[a_m:0]
A[a_b:1]
a. 16 bit wide memory bank interfaced to two 8 bit memory chips
CS
OE
WE
CE
OE
WE
BLS[1]
BLS[0]
UB
LB
D[15:0]
IO[15:0]
A[a_m:0]
A[a_b:1]
b. 16 bit wide memory bank interfaced to a 16 bit memory chip
Fig 17. 16 bit bank external memory interfaces (bits MW = 01)
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Chapter 5: LPC24XX External Memory Controller (EMC)
11.3 8-bit wide memory bank connection
CS
OE
CE
OE
WE
BLS[0]
D[7:0]
IO[7:0]
A[a_m:0]
A[a_b:0]
Fig 18. 8 bit bank external memory interface (bits MW = 00)
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Chapter 5: LPC24XX External Memory Controller (EMC)
11.4 Memory configuration example
D[31:0]
A[20:0]
A[20:0]
A[20:0]
nCE
Q[31:0]
D[31:0]
CS0
OE
nOE
2Mx32 Burst Mask ROM
A[15:0]
D[31:16]
A[15:0]
nCE
IO[15:0]
CS1
WE
nOE
nWE
nUB
nLB
A[15:0]
D[15:0]
A[15:0]
nCE
IO[15:0]
nOE
nWE
nUB
nLB
64Kx16 SRAM, two off
D[31:24]
D[23:16]
A[16:0]
A[16:0]
A[16:0]
nCE
IO[7:0]
IO[7:0]
IO[7:0]
IO[7:0]
CS2
nOE
BLS3
nWE
A[16:0]
nCE
nOE
BLS2
BLS1
nWE
D[15:8]
D[7:0]
A[16:0]
A[16:0]
A[16:0]
nCE
nOE
nWE
A[16:0]
nCE
nOE
BLS0
nWE
128Kx8 SRAM, four off
Fig 19. Typical memory configuration diagram
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
Rev. 02 — 19 December 2008
User manual
1. How to read this chapter
The Memory Accelerator Module operates in combination with the flash controller and is
available in parts LPC2458/68/78.
2. Introduction
The MAM block in the LPC2400 maximizes the performance of the ARM processor when
it is running code in Flash memory using a single Flash bank.
3. Operation
Simply put, the Memory Accelerator Module (MAM) attempts to have the next ARM
instruction that will be needed in its latches in time to prevent CPU fetch stalls. The
LPC2400 uses one bank of Flash memory, compared to the two banks used on
predecessor devices. It includes three 128 bit buffers called the Prefetch buffer, the
Branch Trail Buffer and the data buffer. When an Instruction Fetch is not satisfied by either
the Prefetch or Branch Trail buffer, nor has a prefetch been initiated for that line, the ARM
is stalled while a fetch is initiated for the 128 bit line. If a prefetch has been initiated but not
yet completed, the ARM is stalled for a shorter time. Unless aborted by a data access, a
prefetch is initiated as soon as the Flash has completed the previous access. The
prefetched line is latched by the Flash module, but the MAM does not capture the line in
its prefetch buffer until the ARM core presents the address from which the prefetch has
been made. If the core presents a different address from the one from which the prefetch
has been made, the prefetched line is discarded.
The prefetch and Branch Trail buffers each include four 32 bit ARM instructions or eight
16 bit Thumb instructions. During sequential code execution, typically the prefetch buffer
contains the current instruction and the entire Flash line that contains it.
The MAM uses the LPROT[0] line to differentiate between instruction and data accesses.
Code and data accesses use separate 128 bit buffers. 3 of every 4 sequential 32 bit code
or data accesses "hit" in the buffer without requiring a Flash access (7 of 8 sequential
16 bit accesses, 15 of every 16 sequential byte accesses). The fourth (eighth, 16th)
sequential data access must access Flash, aborting any prefetch in progress. When a
Flash data access is concluded, any prefetch that had been in progress is re-initiated.
Timing of Flash read operations is programmable and is described later in this section.
In this manner, there is no code fetch penalty for sequential instruction execution when the
CPU clock period is greater than or equal to one fourth of the Flash access time. The
average amount of time spent doing program branches is relatively small (less than 25%)
and may be minimized in ARM (rather than Thumb) code through the use of the
conditional execution feature present in all ARM instructions. This conditional execution
may often be used to avoid small forward branches that would otherwise be necessary.
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
Branches and other program flow changes cause a break in the sequential flow of
instruction fetches described above. The Branch Trail buffer captures the line to which
such a non-sequential break occurs. If the same branch is taken again, the next
instruction is taken from the Branch Trail buffer. When a branch outside the contents of the
prefetch and Branch Trail buffer is taken, a stall of several clocks is needed to load the
Branch Trail buffer. Subsequently, there will typically be no further instruction fetch delays
until a new and different branch occurs.
If an attempt is made to write directly to the Flash memory, without using the normal Flash
programming interface, the MAM generates a data abort.
4. Memory Acceleration Module blocks
The Memory Accelerator Module is divided into several functional blocks:
• A Flash Address Latch and an incrementor function to form prefetch addresses
• A 128 bit prefetch buffer and an associated Address latch and comparator
• A 128 bit Branch Trail buffer and an associated Address latch and comparator
• A 128 bit Data buffer and an associated Address latch and comparator
• Control logic
• Wait logic
Figure 6–20 shows a simplified block diagram of the Memory Accelerator Module data
paths.
In the following descriptions, the term “fetch” applies to an explicit Flash read request from
the ARM. “Pre-fetch” is used to denote a Flash read of instructions beyond the current
processor fetch address.
4.1 Flash memory bank
There is one bank of Flash memory for the LPC2400 MAM.
Flash programming operations are not controlled by the MAM, but are handled as a
separate function. A “boot block” sector contains Flash programming algorithms that may
be called as part of the application program, and a loader that may be run to allow serial
programming of the Flash memory.
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
MEMORY ADDRESS
FLASH MEMORY BANK
BUS
INTERFACE
ARM LOCAL BUS
BUFFERS
Fig 20. Simplified block diagram of the Memory Accelerator Module
4.2 Instruction latches and data latches
Code and Data accesses are treated separately by the Memory Accelerator Module.
There is a 128 bit Latch, a 15 bit Address Latch, and a 15 bit comparator associated with
each buffer (prefetch, branch trail, and data). Each 128 bit latch holds 4 words (4 ARM
instructions, or 8 Thumb instructions).
Also associated with each buffer are 32 4:1 Multiplexers that select the requested word
from the 128 bit line.
4.3 Flash programming Issues
Since the Flash memory does not allow accesses during programming and erase
operations, it is necessary for the MAM to force the CPU to wait if a memory access to a
Flash address is requested while the Flash module is busy. (This is accomplished by
asserting the ARM7TDMI-S local bus signal CLKEN.) Under some conditions, this delay
could result in a Watchdog time-out. The user will need to be aware of this possibility and
take steps to ensure that an unwanted Watchdog reset does not cause a system failure
while programming or erasing the Flash memory.
In order to preclude the possibility of stale data being read from the Flash memory, the
LPC2400 MAM holding latches are automatically invalidated at the beginning of any Flash
programming or erase operation. Any subsequent read from a Flash address will cause a
new fetch to be initiated after the Flash operation has completed.
5. Memory Accelerator Module operating modes
Three modes of operation are defined for the MAM, trading off performance for ease of
predictability:
Mode 0: MAM off. All memory requests result in a Flash read operation (see note 2
below). There are no instruction prefetches.
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
Mode 1: MAM partially enabled. Sequential instruction accesses are fulfilled from the
holding latches if the data is present. Instruction prefetch is enabled. Non-sequential
that all branches cause memory fetches. All data operations cause a Flash read
because buffered data access timing is hard to predict and is very situation dependent.
Mode 2: MAM fully enabled. Any memory request (code or data) for a value that is
contained in one of the corresponding holding latches is fulfilled from the latch.
Instruction prefetch is enabled. Flash read operations are initiated for instruction
prefetch and code or data values not available in the corresponding holding latches.
Table 96. MAM responses to program accesses of various types
Program Memory Request Type
MAM Mode
0
1
2
Sequential access, data in latches
Initiate Fetch[2]
Use Latched
Data[1]
Use Latched
Data[1]
Sequential access, data not in latches
Initiate Fetch
Initiate Fetch[1]
Initiate Fetch[1]
Data[1]
Non-sequential access, data not in
latches
Initiate Fetch
Initiate Fetch[1]
Initiate Fetch[1]
[1] Instruction prefetch is enabled in modes 1 and 2.
[2] The MAM actually uses latched data if it is available, but mimics the timing of a Flash read operation. This
saves power while resulting in the same execution timing. The MAM can truly be turned off by setting the
fetch timing value in MAMTIM to one clock.
Table 97. MAM responses to data and DMA accesses of various types
Data Memory Request Type
MAM Mode
0
1
2
Sequential access, data in latches
Initiate Fetch[1]
Initiate Fetch[1]
Use Latched
Data
Sequential access, data not in latches
Non-sequential access, data in latches
Initiate Fetch
Initiate Fetch[1]
Initiate Fetch
Initiate Fetch[1]
Initiate Fetch
Use Latched
Data
Non-sequential access, data not in latches Initiate Fetch
Initiate Fetch
Initiate Fetch
[1] The MAM actually uses latched data if it is available, but mimics the timing of a Flash read operation. This
saves power while resulting in the same execution timing. The MAM can truly be turned off by setting the
fetch timing value in MAMTIM to one clock.
6. MAM configuration
After reset the MAM defaults to the disabled state. Software can turn memory access
acceleration on or off at any time. This allows most of an application to be run at the
highest possible performance, while certain functions can be run at a somewhat slower
but more predictable rate if more precise timing is required.
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
7. Register description
follow. Writes to any unused bits are ignored. A read of any unused bits will return a logic
zero.
Table 98. Summary of Memory Acceleration Module registers
Name
Description
Access Reset
value[1]
Address
MAMCR Memory Accelerator Module Control Register.
Determines the MAM functional mode, that is, to
what extent the MAM performance enhancements
R/W
0x0
0xE01F C000
MAMTIM Memory Accelerator Module Timing control.
Determines the number of clocks used for Flash
memory fetches (1 to 7 processor clocks).
R/W
0x07
0xE01F C004
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
7.1 MAM Control Register (MAMCR - 0xE01F C000)
Following any reset, MAM functions are disabled. Software can turn memory access
acceleration on or off at any time allowing most of an application to be run at the highest
possible performance, while certain functions can be run at a somewhat slower but more
predictable rate if more precise timing is required.
Changing the MAM operating mode causes the MAM to invalidate all of the holding
latches, resulting in new reads of Flash information as required. This guarantees
synchronization of the MAM to CPU operation.
Table 99. MAM Control Register (MAMCR - address 0xE01F C000) bit description
Bit
Symbol
Value Description
Reset
value
1:0
MAM_mode
_control
These bits determine the operating mode of the MAM.
0
00
01
10
11
-
MAM functions disabled
MAM functions partially enabled
MAM functions fully enabled
Reserved. Not to be used in the application.
Unused, always 0.
7:2
-
0
7.2 MAM Timing Register (MAMTIM - 0xE01F C004)
The MAM Timing register determines how many CCLK cycles are used to access the
Flash memory. This allows tuning MAM timing to match the processor operating
frequency. Flash access times from 1 clock to 7 clocks are possible. Single clock Flash
accesses would essentially remove the MAM from timing calculations. In this case the
MAM mode may be selected to optimize power usage.
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
Table 100. MAM Timing register (MAMTIM - address 0xE01F C004) bit description
Bit Symbol
Value Description
Reset
value
2:0 MAM_fetch_
cycle_timing
These bits set the duration of MAM fetch operations.
0 - Reserved
07
000
001
1 - MAM fetch cycles are 1 processor clock (CCLK) in
duration
010
011
100
101
110
111
2 - MAM fetch cycles are 2 CCLKs in duration
3 - MAM fetch cycles are 3 CCLKs in duration
4 - MAM fetch cycles are 4 CCLKs in duration
5 - MAM fetch cycles are 5 CCLKs in duration
6 - MAM fetch cycles are 6 CCLKs in duration
7 - MAM fetch cycles are 7 CCLKs in duration
Warning: These bits set the duration of MAM Flash fetch operations
as listed here. Improper setting of this value may result in incorrect
operation of the device.
7:3
-
-
Unused, always 0
0
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
xFFE0
30000
20000
xFFE4
30004
20004
xFFE8
30008
20008
xFFEC
3000C
2000C
INCREMENTOR
MUX
D
Q
ENAL0
cclk
10000
0FFF0
10004
0FFF4
10008
0FFF8
1000C
0FFFC
EN
ADDR
00020
00010
00000
00024
00014
00004
00028
00018
00008
0002C
0001C
0000C
[18:4]
=
EQA0
128
ENP
ENBT
END
ADDR
PREFETCH LATCH
ADDR
BT LATCH
128
ADDR
DATA LATCH
128
=
=
=
128
EQPREF
EQBT
EQD
LA[3:2]
PREFETCH MUX
32
BT MUX
32
DATA MUX
32
FINAL MUX
DI[31:0] (to ARM core)
Fig 21. Block diagram of the Memory Accelerator Module
8. MAM usage notes
When changing MAM timing, the MAM must first be turned off by writing a zero to
MAMCR. A new value may then be written to MAMTIM. Finally, the MAM may be turned
on again by writing a value (1 or 2) corresponding to the desired operating mode to
MAMCR.
For a system clock slower than 20 MHz, MAMTIM can be 001. For a system clock
between 20 MHz and 40 MHz, flash access time is suggested to be 2 CCLKs, while in
systems with a system clock faster than 40 MHz, 3 CCLKs are proposed. For system
clocks of 60 MHz and above, 4CCLK’s are needed.
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Chapter 6: LPC24XX Memory Accelerator Module (MAM)
Table 101. Suggestions for MAM timing selection
system clock
Number of MAM fetch cycles in MAMTIM
< 20 MHz
1 CCLK
2 CCLK
3 CCLK
4 CCLK
20 MHz to 40 MHz
40 MHz to 60 MHz
> 60 MHz
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
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User manual
1. Features
• ARM PrimeCell Vectored Interrupt Controller
• Mapped to AHB address space for fast access
• Supports 32 vectored IRQ interrupts
• 16 programmable interrupt priority levels
• Fixed hardware priority within each programmable priority level
• Hardware priority level masking
• Any input can be assigned as an FIQ interrupt
• Software interrupt generation
2. Description
The ARM processor core has two interrupt inputs called Interrupt Request (IRQ) and Fast
Interrupt reQuest (FIQ). The Vectored Interrupt Controller (VIC) takes 32 interrupt request
inputs and programmably assigns them as FIQ or vectored IRQ types. The programmable
assignment scheme means that priorities of interrupts from the various peripherals can be
dynamically assigned and adjusted.
Fast Interrupt reQuest (FIQ) requests have the highest priority. If more than one request is
assigned to FIQ, the VIC ORs the requests to produce the FIQ signal to the ARM
processor. The fastest possible FIQ latency is achieved when only one request is
classified as FIQ, because then the FIQ service routine can simply start dealing with that
device. But if more than one request is assigned to the FIQ class, the FIQ service routine
can read a word from the VIC that identifies which FIQ source(s) is (are) requesting an
interrupt.
Vectored IRQ’s, which include all interrupt requests that are not classified as FIQs, have a
programmable interrupt priority. When more than one interrupt is assigned the same
priority and occur simultaneously, the one connected to the lowest numbered VIC channel
The VIC ORs the requests from all of the vectored IRQs to produce the IRQ signal to the
ARM processor. The IRQ service routine can start by reading a register from the VIC and
jumping to the address supplied by that register.
3. Register description
follow.
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 102. Summary of VIC registers
Name
Description
Access Reset Address
value[1]
VICIRQStatus
VICFIQStatus
VICRawIntr
IRQ Status Register. This register reads out the state of those
interrupt requests that are enabled and classified as IRQ.
RO
0
0
-
0xFFFF F000
0xFFFF F004
0xFFFF F008
FIQ Status Requests. This register reads out the state of those RO
interrupt requests that are enabled and classified as FIQ.
Raw Interrupt Status Register. This register reads out the state of RO
the 32 interrupt requests / software interrupts, regardless of
enabling or classification.
VICIntSelect
VICIntEnable
Interrupt Select Register. This register classifies each of the 32 R/W
interrupt requests as contributing to FIQ or IRQ.
0
0
0xFFFF F00C
0xFFFF F010
Interrupt Enable Register. This register controls which of the 32 R/W
interrupt requests and software interrupts are enabled to
contribute to FIQ or IRQ.
VICIntEnClr
VICSoftInt
Interrupt Enable Clear Register. This register allows software to WO
clear one or more bits in the Interrupt Enable register.
-
0xFFFF F014
0xFFFF F018
Software Interrupt Register. The contents of this register are
ORed with the 32 interrupt requests from various peripheral
functions.
R/W
0
VICSoftIntClear
VICProtection
Software Interrupt Clear Register. This register allows software WO
to clear one or more bits in the Software Interrupt register.
-
0xFFFF F01C
0xFFFF F020
Protection enable register. This register allows limiting access to R/W
the VIC registers by software running in privileged mode.
0
VICSWPriorityMask Software Priority Mask Register. Allows masking individual
interrupt priority levels in any combination.
R/W
0xFFFF 0xFFFF F024
VICVectAddr0
Vector address 0 register. Vector Address Registers 0-31 hold
the addresses of the Interrupt Service routines (ISRs) for the 32
vectored IRQ slots.
R/W
0
0xFFFF F100
VICVectAddr1
VICVectAddr2
VICVectAddr3
VICVectAddr4
VICVectAddr5
VICVectAddr6
VICVectAddr7
VICVectAddr8
VICVectAddr9
VICVectAddr10
VICVectAddr11
VICVectAddr12
VICVectAddr13
VICVectAddr14
VICVectAddr15
VICVectAddr16
VICVectAddr17
VICVectAddr18
Vector address 1 register.
Vector address 2 register.
Vector address 3 register.
Vector address 4 register.
Vector address 5 register.
Vector address 6 register.
Vector address 7 register.
Vector address 8 register.
Vector address 9 register.
Vector address 10 register.
Vector address 11 register.
Vector address 12 register.
Vector address 13 register.
Vector address 14 register.
Vector address 15 register.
Vector address 16 register.
Vector address 17 register.
Vector address 18 register.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0xFFFF F104
0xFFFF F108
0xFFFF F10C
0xFFFF F110
0xFFFF F114
0xFFFF F118
0xFFFF F11C
0xFFFF F120
0xFFFF F124
0xFFFF F128
0xFFFF F12C
0xFFFF F130
0xFFFF F134
0xFFFF F138
0xFFFF F13C
0xFFFF F140
0xFFFF F144
0xFFFF F148
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 102. Summary of VIC registers
Name
Description
Access Reset Address
value[1]
VICVectAddr19
VICVectAddr20
VICVectAddr21
VICVectAddr22
VICVectAddr23
VICVectAddr24
VICVectAddr25
VICVectAddr26
VICVectAddr27
VICVectAddr28
VICVectAddr29
VICVectAddr30
VICVectAddr31
VICVectPriority0
Vector address 19 register.
Vector address 20 register.
Vector address 21 register.
Vector address 22 register.
Vector address 23 register.
Vector address 24 register.
Vector address 25 register.
Vector address 26 register.
Vector address 27 register.
Vector address 28 register.
Vector address 29 register.
Vector address 30 register.
Vector address 31 register.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0xFFFF F14C
0xFFFF F150
0xFFFF F154
0xFFFF F158
0xFFFF F15C
0xFFFF F160
0xFFFF F164
0xFFFF F168
0xFFFF F16C
0xFFFF F170
0xFFFF F174
0xFFFF F178
0xFFFF F17C
0xFFFF F200
0
0
0
0
0
0
0
0
0
0
0
0
Vector priority 0 register. Vector Priority Registers 0-31. Each of R/W
these registers designates the priority of the corresponding
vectored IRQ slot.
0xF
VICVectPriority1
VICVectPriority2
VICVectPriority3
VICVectPriority4
VICVectPriority5
VICVectPriority6
VICVectPriority7
VICVectPriority8
VICVectPriority9
VICVectPriority10
VICVectPriority11
VICVectPriority12
VICVectPriority13
VICVectPriority14
VICVectPriority15
VICVectPriority16
VICVectPriority17
VICVectPriority18
VICVectPriority19
VICVectPriority20
VICVectPriority21
VICVectPriority22
VICVectPriority23
VICVectPriority24
VICVectPriority25
Vector priority 1 register.
Vector priority 2 register.
Vector priority 3 register.
Vector priority 4 register.
Vector priority 5 register.
Vector priority 6 register.
Vector priority 7 register.
Vector priority 8 register.
Vector priority 9 register.
Vector priority 10 register.
Vector priority 11 register.
Vector priority 12 register.
Vector priority 13 register.
Vector priority 14 register.
Vector priority 15 register.
Vector priority 16 register.
Vector priority 17 register.
Vector priority 18 register.
Vector priority 19 register.
Vector priority 20 register.
Vector priority 21 register.
Vector priority 22 register.
Vector priority 23 register.
Vector priority 24 register.
Vector priority 25 register.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xF
0xFFFF F204
0xFFFF F208
0xFFFF F20C
0xFFFF F210
0xFFFF F214
0xFFFF F218
0xFFFF F21C
0xFFFF F220
0xFFFF F224
0xFFFF F228
0xFFFF F22C
0xFFFF F230
0xFFFF F234
0xFFFF F238
0xFFFF F23C
0xFFFF F240
0xFFFF F244
0xFFFF F248
0xFFFF F24C
0xFFFF F250
0xFFFF F254
0xFFFF F258
0xFFFF F25C
0xFFFF F260
0xFFFF F264
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 102. Summary of VIC registers
Name
Description
Access Reset Address
value[1]
VICVectPriority26
VICVectPriority27
VICVectPriority28
VICVectPriority29
VICVectPriority30
VICVectPriority31
VICAddress
Vector priority 26 register.
Vector priority 27 register.
Vector priority 28 register.
Vector priority 29 register.
Vector priority 30 register.
Vector priority 31 register.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0xF
0xF
0xF
0xF
0xF
0xF
0
0xFFFF F268
0xFFFF F26C
0xFFFF F270
0xFFFF F274
0xFFFF F278
0xFFFF F27C
0xFFFF FF00
Vector address register. When an IRQ interrupt occurs, the
Vector Address Register holds the address of the currently
active interrupt.
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
The following section describes the VIC registers in the order in which they are used in the
VIC logic, from those closest to the interrupt request inputs to those most abstracted for
use by software. For most people, this is also the best order to read about the registers
when learning the VIC.
3.1 Software Interrupt Register (VICSoftInt - 0xFFFF F018)
The VICSoftInt register is used to generate software interrupts. The contents of this
register are ORed with the 32 interrupt requests from the various peripherals, before any
other logic is applied.
Table 103. Software Interrupt register (VICSoftInt - address 0xFFFF F018) bit description
Bit
Symbol
Value
Description
Reset
value
31:0
“Interrupt sources
bit allocation
0
1
Do not force the interrupt request with this bit number. Writing zeroes to bits
0
Force the interrupt request with this bit number.
3.2 Software Interrupt Clear Register (VICSoftIntClear - 0xFFFF F01C)
The VICSoftIntClear register is a ’Write Only’ register. This register allows software to
clear one or more bits in the Software Interrupt register, without having to first read it.
Table 104. Software Interrupt Clear register (VICSoftIntClear - address 0xFFFF F01C) bit description
Bit
Symbol
Value
Description
Reset
value
31:0
0
1
Writing a 0 leaves the corresponding bit in VICSoftInt unchanged.
0
Writing a 1 clears the corresponding bit in the Software Interrupt register,
removing any interrupt that may have been generated by that bit.
3.3 Raw Interrupt Status Register (VICRawIntr - 0xFFFF F008)
This is a read only register. This register reads out the state of the 32 interrupt requests
and software interrupts, regardless of enabling or classification.
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 105. Raw Interrupt Status register (VICRawIntr - address 0xFFFF F008) bit description
Bit Symbol
Value Description
Reset
value
7–117
0
1
Neither the hardware nor software interrupt request with this
bit number are asserted.
-
“Interrupt
sources bit
allocation
The hardware or software interrupt request with this bit
number is asserted.
3.4 Interrupt Enable Register (VICIntEnable - 0xFFFF F010)
This is a read/write accessible register. This register controls which of the 32 combined
hardware and software interrupt requests are enabled to contribute to FIQ or IRQ.
Table 106. Interrupt Enable register (VICIntEnable - address 0xFFFF F010) bit description
Bit Symbol
Description
Reset
value
7–117
When this register is read, 1s indicate interrupt requests or software
interrupts that are enabled to contribute to FIQ or IRQ.
0
“Interrupt
sources bit
allocation
When this register is written, ones enable interrupt requests or
software interrupts to contribute to FIQ or IRQ, zeroes have no
effect. See Section 7–3.5 “Interrupt Enable Clear Register
below for how to disable interrupts.
3.5 Interrupt Enable Clear Register (VICIntEnClear - 0xFFFF F014)
This is a write only register. This register allows software to clear one or more bits in the
Interrupt Enable register (see Section 7–3.4 “Interrupt Enable Register (VICIntEnable -
0xFFFF F010)” on page 112), without having to first read it.
Table 107. Interrupt Enable Clear register (VICIntEnClear - address 0xFFFF F014) bit
description
Bit Symbol
Value Description
Reset
value
7–117
0
1
Writing a 0 leaves the corresponding bit in VICIntEnable
unchanged.
-
“Interrupt
sources bit
allocation
Writing a 1 clears the corresponding bit in the Interrupt
Enable register, thus disabling interrupts for this request.
3.6 Interrupt Select Register (VICIntSelect - 0xFFFF F00C)
This is a read/write accessible register. This register classifies each of the 32 interrupt
requests as contributing to FIQ or IRQ.
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 108. Interrupt Select register (VICIntSelect - address 0xFFFF F00C) bit description
Bit
Symbol
Value Description
Reset
value
7–117
0
1
The interrupt request with this bit number is assigned to the
IRQ category.
0
“Interrupt
sources bit
allocation
The interrupt request with this bit number is assigned to the
FIQ category.
3.7 IRQ Status Register (VICIRQStatus - 0xFFFF F000)
This is a read only register. This register reads out the state of those interrupt requests
that are enabled and classified as IRQ.
Table 109. IRQ Status register (VICIRQStatus - address 0xFFFF F000) bit description
Bit Symbol
Description
Reset
value
7–117
A bit read as 1 indicates a corresponding interrupt request being
enabled, classified as IRQ, and asserted
0
“Interrupt
sources bit
allocation
3.8 FIQ Status Register (VICFIQStatus - 0xFFFF F004)
This is a read only register. This register reads out the state of those interrupt requests
that are enabled and classified as FIQ. If more than one request is classified as FIQ, the
FIQ service routine can read this register to see which request(s) is (are) active.
Table 110. FIQ Status register (VICFIQStatus - address 0xFFFF F004) bit description
Bit Symbol
Description
Reset
value
7–117
A bit read as 1 indicates a corresponding interrupt request being
enabled, classified as IRQ, and asserted
0
“Interrupt
sources bit
allocation
3.9 Vector Address Registers 0-31 (VICVectAddr0-31 - 0xFFFF F100 to
17C)
These are read/write accessible registers. These registers hold the addresses of the
Interrupt Service routines (ISRs) for the 32 vectored IRQ slots.
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 111. Vector Address registers 0-31 (VICVectAddr0-31 - addresses 0xFFFF F100 to
0xFFFF F17C) bit description
Bit Symbol
Description
Reset value
31:0 VICVectAddr The VIC provides the contents of one of these registers in
response to a read of the Vector Address register (VICAddress
register (one of the 32 VICVectAddr registers) that
0x0000 0000
corresponds to the interrupt that is to be serviced is read from
VICAddress whenever an interrupt occurs.
3.10 Vector Priority Registers 0-31 (VICVectPriority0-31 - 0xFFFF F200 to
27C)
These registers select a priority level for the 32 vectored IRQs. There are 16 priority
levels, corresponding to the values 0 through 15 decimal, of which 15 is the lowest priority.
The reset value of these registers defaults all interrupt to the lowest priority, allowing a
single write to elevate the priority of an individual interrupt.
Table 112. Vector Priority registers 0-31 (VICVectPriority0-31 - addresses 0xFFFF F200 to
0xFFFF F27C) bit description
Bit Symbol
Description
Reset
value
3:0 VICVectPriority Selects one of 16 priority levels for the corresponding vectored
interrupt.
0xF
31:4 -
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
3.11 Vector Address Register (VICAddress - 0xFFFF FF00)
When an IRQ interrupt occurs, the address of the Interrupt Service Routine (ISR) for the
interrupt that is to be serviced can be read from this register. The address supplied is from
one of the Vector Address Registers (VICVectAddr0-31).
Table 113. Vector Address register (VICAddress - address 0xFFFF FF00) bit description
Bit Symbol
Description
Reset
value
31:0 VICAddress Contains the address of the ISR for the currently active interrupt. This
register must be written (with any value) at the end of an ISR, to
update the VIC priority hardware. Writing to the register at any other
time can cause incorrect operation.
0
3.12 Software Priority Mask Register (VICSWPriorityMask - 0xFFFF F024)
The Software Priority Mask Register contains individual mask bits for the 16 interrupt
priority levels.
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 114. Software Priority Mask register (VICSWPriorityMask - address 0xFFFF F024) bit
description
Bit
Symbol
Value Description
Reset
value
15:0 VICSWPriorityMask 0
1
Interrupt priority level is masked.
0xFFFF
Interrupt priority level is not masked.
31:16 -
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
3.13 Protection Enable Register (VICProtection - 0xFFFF F020)
This is a read/write accessible register. This one bit register controls access to the VIC
registers by software running in User mode. The VICProtection register itself can only be
accessed in privileged mode.
Table 115. Protection Enable register (VICProtection - address 0xFFFF F020) bit description
Bit Symbol
Value Description
Reset
value
0
VIC_access
0
1
-
VIC registers can be accessed in User or privileged mode.
0
The VIC registers can only be accessed in privileged mode.
31:1 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
4. Interrupt sources
device may have one or more interrupt lines to the Vectored Interrupt Controller. Each line
may represent more than one interrupt source. There is no significance or priority about
what line is connected where, except for certain standards from ARM.
Table 116. Connection of interrupt sources to the Vectored Interrupt Controller
Block
Flag(s)
VIC Channel # and
Hex Mask
WDT
Watchdog Interrupt (WDINT)
Reserved for Software Interrupts only
Embedded ICE, DbgCommRx
Embedded ICE, DbgCommTX
Match 0 - 1 (MR0, MR1)
0
1
2
3
4
0x0000 0001
0x0000 0002
0x0000 0004
0x0000 0008
0x0000 0010
-
ARM Core
ARM Core
TIMER0
Capture 0 - 1 (CR0, CR1)
TIMER1
UART0
Match 0 - 2 (MR0, MR1, MR2)
Capture 0 - 1 (CR0, CR1)
5
6
0x0000 0020
0x0000 0040
Rx Line Status (RLS)
Transmit Holding Register Empty (THRE)
Rx Data Available (RDA)
Character Time-out Indicator (CTI)
End of Auto-Baud (ABEO)
Auto-Baud Time-Out (ABTO)
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 116. Connection of interrupt sources to the Vectored Interrupt Controller
Block
Flag(s)
VIC Channel # and
Hex Mask
UART1
Rx Line Status (RLS)
7
0x0000 0080
Transmit Holding Register Empty (THRE)
Rx Data Available (RDA)
Character Time-out Indicator (CTI)
Modem Control Change
End of Auto-Baud (ABEO)
Auto-Baud Time-Out (ABTO)
PWM0,
PWM1
Match 0 - 6 of PWM0
Capture 0 of PWM0
8
9
0x0000 0100
0x0000 0200
Match 0 - 6 of PWM1
Capture 0-1 of PWM1
I2C0
SI (state change)
SPI, SSP0
SPI Interrupt Flag of SPI (SPIF)
Mode Fault of SPI (MODF)
Tx FIFO half empty of SSP0
Rx FIFO half full of SSP0
Rx Timeout of SSP0
10 0x0000 0400
Rx Overrun of SSP0
SSP 1
Tx FIFO half empty
11 0x0000 0800
Rx FIFO half full
Rx Timeout
Rx Overrun
PLL
PLL Lock (PLOCK)
12 0x0000 1000
13 0x0000 2000
RTC
Counter Increment (RTCCIF)
Alarm (RTCALF)
Subsecond Int (RTCSSF)
External Interrupt 0 (EINT0)
External Interrupt 1 (EINT1)
External Interrupt 2 (EINT2)/LCD
System
Control
(External
Interrupts)
14 0x0000 4000
15 0x0000 8000
16 0x0001 0000
Remark: The LCD is available on LPC247x only. The LCD
interrupt is shared with EINT2 if bit 20 (PCLCD) is set in
External Interrupt 3 (EINT3).
17 0x0002 0000
Note: EINT3 channel is shared with GPIO interrupts
A/D Converter 0 end of conversion
SI (state change)
ADC0
I2C1
18 0x0004 0000
19 0x0008 0000
20 0x0010 0000
21 0x0020 0000
BOD
Brown Out detect
Ethernet
WakeupInt, SoftInt, TxDoneInt, TxFinishedInt,
TxErrorInt, TxUnderrunInt, RxDoneInt,
RxFinishedInt, RxErrorInt, RxOverrunInt.
USB
USB_INT_REQ_LP, USB_INT_REQ_HP,
USB_INT_REQ_DMA
22 0x0040 0000
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
Table 116. Connection of interrupt sources to the Vectored Interrupt Controller
Block
Flag(s)
VIC Channel # and
Hex Mask
CAN
CAN Common, CAN 0 Tx, CAN 0 Rx, CAN 1 Tx,
CAN 1 Rx
23 0x0080 0000
SD/ MMC
interface
RxDataAvlbl, TxDataAvlbl, RxFifoEmpty, TxFifoEmpty,
RxFifoFull, TxFifoFull, RxFifoHalfFull, TxFifoHalfEmpty,
RxActive, TxActive, CmdActive, DataBlockEnd, StartBitErr,
DataEnd, CmdSent, CmdRespEnd, RxOverrun,
TxUnderrun, DataTimeOut, CmdTimeOut, DataCrcFail,
CmdCrcFail
24 0x0100 0000
GP DMA
Timer 2
IntStatus of DMA channel 0, IntStatus of DMA channel 1
Match 0-3
25 0x0200 0000
26 0x0400 0000
Capture 0-1
Timer 3
UART 2
Match 0-3
27 0x0800 0000
28 0x1000 0000
Capture 0-1
Rx Line Status (RLS)
Transmit Holding Register Empty (THRE)
Rx Data Available (RDA)
Character Time-out Indicator (CTI)
End of Auto-Baud (ABEO)
Auto-Baud Time-Out (ABTO)
Rx Line Status (RLS)
UART 3
29 0x2000 0000
Transmit Holding Register Empty (THRE)
Rx Data Available (RDA)
Character Time-out Indicator (CTI)
End of Auto-Baud (ABEO)
Auto-Baud Time-Out (ABTO)
SI (state change)
I2C2
I2S
30 0x4000 0000
31 0x8000 0000
irq_rx
irq_tx
Table 117. Interrupt sources bit allocation table
Bit
31
I2S
30
I2C2
22
29
UART3
21
28
UART2
20
27
TIMER3
19
26
TIMER2
18
25
GPDMA
17
24
SD/MMC
16
Symbol
Bit
23
Symbol
CAN1&2
USB
Ethernet
BOD
I2C1
AD0
EINT3
EINT2/
LCD(1)
Bit
15
EINT1
7
14
EINT0
6
13
RTC
5
12
PLL
11
SSP1
3
10
SPI/SSP0
2
9
I2C0
1
8
PWM0&1
0
Symbol
Bit
4
Symbol
UART1
UART0
TIMER1
TIMER0
ARMCore1 ARMCore0
-
WDT
[1] LPC247x only.
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Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
interrupt request, masking, and selection
SoftIntClear
[31:0]
IntEnableClear
[31:0]
status registers and FIQ generation
FIQStatus
SoftInt
[31:0]
IntEnable
[31:0]
[31:0]
FIQ
FIQStatus
[31:0]
VICINT
SOURCE
[31:0]
IRQStatus
[31:0]
IRQStatus
[31:0]
RawIntr
[31:0]
IntSelect
[31:0]
prioritization and vector generation
vectored interrupt 0
SWPriorityMask [31:0]
HWPriorityMask [31:0]
IRQStatus
[0]
SWPriorityMask
[31:0]
D
Q
D
Q
PRIORITY
MASKING
LOGIC
VectIRQ0
SWPriorityMask [0]
HWPriorityMask [0]
IRQ
PRIORITY
LOGIC
Vect Addr0
[31:0]
VectPriority0
[3:0]
VectAddr0
[31:0]
vector select
for highest priority
interrupt
vectored interrupt 1
VectIRQ1
IRQStatus
[1]
Vect Addr1
[31:0]
Vect
AddrOut
VectAddr
[31:0]
vectored interrupt 31
VectIRQ31
IRQStatus
[31]
Vect Addr31
[31:0]
Fig 22. Block diagram of the Vectored Interrupt Controller
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Chapter 8: LPC24XX Pin configuration
Rev. 02 — 19 December 2008
User manual
1. How to read this chapter
LPC2460 and LPC2470 are flashless and use pins P3[15] and P3[14] for boot control.
Table 118. LPC2400 pin configurations overview
Part
Pins
Pin packages
LQFP208
-
Pin allocation
Pin description
Boot control
TFBGA180/208 TFBGA180/208
LPC2458
180
n/a
LPC2420/60 208
n/a
LPC2468
LPC2470
LPC2478
208
208
208
n/a
the desired function.
2. LPC2400 pin packages
2.1 LPC2400 180-pin package
ball A1
index area
LPC2458
1
2
3
4
5
6
7
8
9 10 11 12 13 14
A
B
C
D
E
F
G
H
J
K
L
M
N
P
002aad094
Transparent top view
Fig 23. LPC2458 pinning TFBGA180 package
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Chapter 8: LPC24XX Pin configuration
2.2 LPC2400 208-pin packages
1
156
105
LPC2400FBD208
52
Fig 24. LPC2400 pinning LQFP208 package
ball A1
index area
2
4
6
8
10 12 14 16
11 13 15 17
1
3
5
7
9
A
B
C
D
E
F
G
H
J
K
L
LPC2400FET208
M
N
P
R
T
U
Transparent top view
Fig 25. LPC2400 pinning TFBGA208 package
3. LPC2458 pinning information
Table 119. LPC2458 pin allocation table
Pin Symbol
Row A
Pin Symbol
Pin Symbol
Pin Symbol
1
5
P3[12]/D12
2
6
P3[2]/D2
P3[8]/D8
3
7
P0[3]/RXD0
P1[10]/ENET_RXD1
4
8
P3[9]/D9
P1[1]/ENET_TXD1
P1[15]/
ENET_REF_CLK/
ENET_RX_CLK
9
P1[3]/ENET_TXD3/
MCICMD/PWM0[2]
10 VSSCORE
11 P0[4]/I2SRX_CLK/RD2/ 12 P1[11]/ENET_RXD2/
CAP2[0]
MCIDAT2/PWM0[6]
13 P0[9]/I2STX_SDA/
MOSI1/MAT2[3]
14 P1[12]/ENET_RXD3/
MCIDAT3/PCAP0[0]
15
-
16
-
Row B
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Chapter 8: LPC24XX Pin configuration
Table 119. LPC2458 pin allocation table …continued
Pin Symbol
Pin Symbol
Pin Symbol
Pin Symbol
1
5
TDO
2
6
P3[11]/D11
3
7
P3[10]/D10
4
8
VSSIO
P1[0]/ENET_TXD0
P1[8]/ENET_CRS_DV/
ENET_CRS
P1[2]/ENET_TXD2/
MCICLK/PWM0[1]
P1[16]/ENET_MDC
9
P4[29]/BLS3/
MAT2[1]/RXD3
10 P1[6]/ENET_TX_CLK/
MCIDAT0/PWM0[4]
11 P0[5]/I2SRX_WS/TD2/ 12 P0[7]/I2STX_CLK/SCK1
CAP2[1]
/MAT2[1]
13 P1[5]/ENET_TX_ER/
MCIPWR/PWM0[3]
14 P4[13]/A13
15
-
16
-
Row C
1
5
9
P3[13]/D13
2
6
TMS
3
7
TDI
4
8
RTCK
VDD(3V3)
P1[4]/ENET_TX_EN
P4[30]/CS0
P4[24]/OE
P1[17]/ENET_MDIO
10 P4[15]/A15
11 VSSIO
12 P0[8]/I2STX_WS/
MISO1/MAT2[2]
13 P1[7]/ENET_COL/
MCIDAT1/PWM0[5]
14 P2[1]/PWM1[2]/RXD1/
PIPESTAT0
15
-
16
-
Row D
1
P0[26]/AD0[3]/
AOUT/RXD3
2
6
TCK
3
7
P3[4]/D4
4
8
TRST
5
9
P0[2]/TXD0
P4[25]/WE
P3[0]/D0
P1[9]/ENET_RXD0
P1[14]/ENET_RX_ER
10 P4[28]/BLS2/
MAT2[0]/TXD3
11 P0[6]/I2SRX_SDA/
SSEL1/MAT2[0]
12 P2[0]/PWM1[1]/TXD1/
TRACECLK
13 VSSIO
14 P1[13]/ENET_RX_DV
15
-
16
-
Row E
1
P0[24]/AD0[1]/
I2SRX_WS/CAP3[1]
2
6
VDD(3V3)
P3[1]/D1
3
7
P3[5]/D5
4
8
P0[25]/AD0[2]/
I2SRX_SDA/TXD3
5
9
DBGEN
P4[31]/CS1
P4[14]/A14
VDD(DCDC)(3V3)
10 VDD(3V3)
11 P2[2]/PWM1[3]/
CTS1/PIPESTAT1
12 VDD(3V3)
13 P2[3]/PWM1[4]/
DCD1/PIPESTAT2
14 P2[4]/PWM1[5]/
DSR1/TRACESYNC
15
-
16
-
Row F
1
5
P3[14]/D14
2
6
VDDA
3
7
VSSA
4
8
P3[6]/D6
P0[23]/AD0[0]/
I2SRX_CLK/CAP3[0]
9
10 P4[12]/A12
14 P4[27]/BLS1
11 P4[11]/A11
12 P2[5]/PWM1[6]/
DTR1/TRACEPKT0
13 P2[6]/PCAP1[0]/
RI1/TRACEPKT1
15
-
16
-
Row G
1
5
9
VDD(DCDC)(3V3)
P3[3]/D3
2
6
VREF
3
7
P3[7]/D7
4
8
P3[15]/D15
10 NC
11 P2[7]/RD2/
RTS1/TRACEPKT2
12 P4[10]/A10
13 VSSIO
14 P2[8]/TD2/
15
-
16
-
TXD2/TRACEPKT3
Row H
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Chapter 8: LPC24XX Pin configuration
Table 119. LPC2458 pin allocation table …continued
Pin Symbol
Pin Symbol
Pin Symbol
Pin Symbol
1
5
9
NC
2
6
RSTOUT
3
7
VSSCORE
4
8
VSSIO
ALARM
10 P4[5]/A5
11 P2[9]/
USB_CONNECT1/
12 P4[9]/A9
RXD2/EXTIN0
13 P0[15]/TXD1/
SCK0/SCK
14 P0[16]/RXD1/
SSEL0/SSEL
15
-
16
-
Row J
1
5
9
RESET
2
6
RTCX1
3
7
RTCX2
4
8
P0[12]/USB_PPWR2/
MISO1/AD0[6]
P0[13]/USB_UP_LED2/
MOSI1/AD0[7]
10 P0[19]/DSR1/
MCICLK/SDA1
11 P4[8]/A8
12 P0[17]/CTS1/
MISO0/MISO
13 P0[18]/DCD1/
MOSI0/MOSI
14 VDD(3V3)
15
-
16
-
Row K
1
5
9
VBAT
2
6
P1[31]/USB_OVRCR2/
SCK1/AD0[5]
3
7
P1[30]/USB_PWRD2/
VBUS/AD0[4]
4
8
XTAL2
P0[29]/USB_D+1
P4[3]/A3
P1[20]/USB_TX_DP1/
PWM1[2]/SCK0
P3[26]/MAT0[1]/
PWM1[3]
VDD(3V3)
10 P4[6]/A6
11 P0[21]/RI1/
MCIPWR/RD1
12 P4[7]/A7
13 P4[26]/BLS0
14 P0[20]/DTR1/
MCICMD/SCL1
15
-
16
-
Row L
1
5
P2[29]/DQMOUT1
2
6
XTAL1
3
7
P0[27]/SDA0
4
8
VDD(3V3)
VSSCORE
P1[18]/USB_UP_LED1/
PWM1[1]/CAP1[0]
P4[0]/A0
P1[25]/USB_LS1/
USB_HSTEN1/MAT1[1]
9
VSSIO
10 P0[10]/TXD2/SDA2/
MAT3[0]
11 VDD(3V3)
12 NC
13 VSSIO
14 P0[22]/RTS1/
MCIDAT0/TD1
15
-
16
-
Row M
1
P0[28]/SCL0
2
6
P2[28]/DQMOUT0
3
7
P3[25]/MAT0[0]/
PWM1[2]
4
8
P3[23]/CAP0[0]/
PCAP1[0]
5
P0[14]/USB_HSTEN2/
USB_CONNECT2/
SSEL1
P1[22]/USB_RCV1/
USB_PWRD1/MAT1[0]
P4[1]/A1
P4[2]/A2
9
P1[27]/USB_INT1/
USB_OVRCR1/CAP0[1]
10 P0[0]/RD1/TXD3/SDA1 11 P2[13]/EINT3/
MCIDAT3/I2STX_SDA
12 P2[11]/EINT1/
MCIDAT1/I2STX_CLK
13 P2[10]/EINT0
14 P4[19]/A19
15
-
16
-
Row N
1
P0[31]/USB_D+2
2
USB_D−2
3
P3[24]/CAP0[1]/
PWM1[1]
4
P0[30]/USB_D−1
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Chapter 8: LPC24XX Pin configuration
Table 119. LPC2458 pin allocation table …continued
Pin Symbol
Pin Symbol
P1[21]/USB_TX_DM1/
PWM1[3]/SSEL0
Pin Symbol
P1[23]/USB_RX_DP1/
PWM1[4]/MISO0
11 P0[1]/TD1/RXD3/SCL1 12 P4[16]/A16
Pin Symbol
5
P2[19]/CLKOUT1
6
7
8
P2[21]/DYCS1
9
VDD(DCDC)(3V3)
10 P1[29]/USB_SDA1/
PCAP1[1]/MAT0[1]
13 P4[17]/A17
14 P2[12]/EINT2/
15
-
16
-
MCIDAT2/I2STX_WS
Row P
1
5
P2[24]/CKEOUT0
2
6
P2[25]/CKEOUT1
P2[20]/DYCS0
3
7
P2[18]/CLKOUT0
4
8
VSSIO
P1[19]/USB_TX_E1/
USB_PPWR1/CAP1[1]
P1[24]/USB_RX_DM1/
PWM1[5]/MOSI0
P1[26]/USB_SSPND1/
PWM1[6]/CAP0[0]
9
P2[16]/CAS
10 P1[28]/USB_SCL1/
PCAP1[0]/MAT0[0]
11 P2[17]/RAS
15
12 P0[11]/RXD2/SCL2/
MAT3[1]
13 P4[4]/A4
14 P4[18]/A18
-
16
-
Table 120. Pin description
Symbol
Ball
Type
Description
P0[0] to P0[31]
I/O
Port 0: Port 0 is a 32-bit I/O port with individual direction controls for each bit. The
operation of port 0 pins depends upon the pin function selected via the Pin
Connect block.
P0[0]/RD1/
TXD3/SDA1
M10[1]
I/O
I
P0[0] — General purpose digital input/output pin.
RD1 — CAN1 receiver input.
O
TXD3 — Transmitter output for UART3.
I/O
I/O
O
SDA1 — I2C1 data input/output (this is not an open-drain pin).
P0[1] — General purpose digital input/output pin.
TD1 — CAN1 transmitter output.
P0[1]/TD1/RXD3/
SCL1
N11[1]
I
RXD3 — Receiver input for UART3.
I/O
I/O
O
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
P0[2] — General purpose digital input/output pin.
TXD0 — Transmitter output for UART0.
P0[2]/TXD0
P0[3]/RXD0
D5[1]
A3[1]
A11[1]
I/O
I
P0[3] — General purpose digital input/output pin.
RXD0 — Receiver input for UART0.
P0[4]/
I2SRX_CLK/
RD2/CAP2[0]
I/O
I/O
P0[4] — General purpose digital input/output pin.
I2SRX_CLK — Receive Clock. It is driven by the master and received by the
slave. Corresponds to the signal SCK in the I2S-bus specification.
I
RD2 — CAN2 receiver input.
I
CAP2[0] — Capture input for Timer 2, channel 0.
P0[5] — General purpose digital input/output pin.
P0[5]/
B11[1]
I/O
I/O
I2SRX_WS/
TD2/CAP2[1]
I2SRX_WS — Receive Word Select. It is driven by the master and received by
the slave. Corresponds to the signal WS in the I2S-bus specification.
O
I
TD2 — CAN2 transmitter output.
CAP2[1] — Capture input for Timer 2, channel 1.
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
D11[1]
Type
I/O
Description
P0[6]/
P0[6] — General purpose digital input/output pin.
I2SRX_SDA/
SSEL1/MAT2[0]
I/O
I2SRX_SDA — Receive data. It is driven by the transmitter and read by the
receiver. Corresponds to the signal SD in the I2S-bus specification.
I/O
O
SSEL1 — Slave Select for SSP1.
MAT2[0] — Match output for Timer 2, channel 0.
P0[7] — General purpose digital input/output pin.
P0[7]/
I2STX_CLK/
SCK1/MAT2[1]
B12[1]
C12[1]
A13[1]
I/O
I/O
I2STX_CLK — Transmit Clock. It is driven by the master and received by the
slave. Corresponds to the signal SCK in the I2S-bus specification.
I/O
O
SCK1 — Serial Clock for SSP1.
MAT2[1] — Match output for Timer 2, channel 1.
P0[8] — General purpose digital input/output pin.
P0[8]/
I2STX_WS/
MISO1/MAT2[2]
I/O
I/O
I2STX_WS — Transmit Word Select. It is driven by the master and received by
the slave. Corresponds to the signal WS in the I2S-bus specification.
I/O
O
MISO1 — Master In Slave Out for SSP1.
MAT2[2] — Match output for Timer 2, channel 2.
P0[9] — General purpose digital input/output pin.
P0[9]/
I/O
I/O
I2STX_SDA/
MOSI1/MAT2[3]
I2STX_SDA — Transmit data. It is driven by the transmitter and read by the
receiver. Corresponds to the signal SD in the I2S-bus specification.
I/O
O
MOSI1 — Master Out Slave In for SSP1.
MAT2[3] — Match output for Timer 2, channel 3.
P0[10] — General purpose digital input/output pin.
TXD2 — Transmitter output for UART2.
P0[10]/TXD2/
SDA2/MAT3[0]
L10[1]
P12[1]
J4[2]
I/O
O
I/O
O
SDA2 — I2C2 data input/output (this is not an open-drain pin).
MAT3[0] — Match output for Timer 3, channel 0.
P0[11] — General purpose digital input/output pin.
RXD2 — Receiver input for UART2.
P0[11]/RXD2/
SCL2/MAT3[1]
I/O
I
I/O
O
SCL2 — I2C2 clock input/output (this is not an open-drain pin).
MAT3[1] — Match output for Timer 3, channel 1.
P0[12] — General purpose digital input/output pin.
USB_PPWR2 — Port Power enable signal for USB port 2.
MISO1 — Master In Slave Out for SSP1.
P0[12]/
I/O
O
USB_PPWR2/
MISO1/AD0[6]
I/O
I
AD0[6] — A/D converter 0, input 6.
P0[13]/
USB_UP_LED2/
MOSI1/AD0[7]
J5[2]
I/O
O
P0[13] — General purpose digital input/output pin.
USB_UP_LED2 — USB port 2 GoodLink LED indicator. It is LOW when device is
configured (non-control endpoints enabled). It is HIGH when the device is not
configured or during global suspend.
I/O
I
MOSI1 — Master Out Slave In for SSP1.
AD0[7] — A/D converter 0, input 7.
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
M5[1]
Type
I/O
O
Description
P0[14]/
P0[14] — General purpose digital input/output pin.
USB_HSTEN2/
USB_CONNECT2/
SSEL1
USB_HSTEN2 — Host Enabled status for USB port 2.
O
USB_CONNECT2 — SoftConnect control for USB port 2. Signal used to switch
an external 1.5 kΩ resistor under software control. Used with the SoftConnect
USB feature.
I/O
I/O
O
SSEL1 — Slave Select for SSP1.
P0[15]/TXD1/
SCK0/SCK
H13[1]
H14[1]
J12[1]
J13[1]
J10[1]
K14[1]
K11[1]
L14[1]
P0[15] — General purpose digital input/output pin.
TXD1 — Transmitter output for UART1.
I/O
I/O
I/O
I
SCK0 — Serial clock for SSP0.
SCK — Serial clock for SPI.
P0[16]/RXD1/
SSEL0/SSEL
P0[16] — General purpose digital input/output pin.
RXD1 — Receiver input for UART1.
I/O
I/O
I/O
I
SSEL0 — Slave Select for SSP0.
SSEL — Slave Select for SPI.
P0[17]/CTS1/
MISO0/MISO
P0[17] — General purpose digital input/output pin.
CTS1 — Clear to Send input for UART1.
MISO0 — Master In Slave Out for SSP0.
MISO — Master In Slave Out for SPI.
I/O
I/O
I/O
I
P0[18]/DCD1/
MOSI0/MOSI
P0[18] — General purpose digital input/output pin.
DCD1 — Data Carrier Detect input for UART1.
MOSI0 — Master Out Slave In for SSP0.
MOSI — Master Out Slave In for SPI.
I/O
I/O
I/O
I
P0[19]/DSR1/
MCICLK/SDA1
P0[19] — General purpose digital input/output pin.
DSR1 — Data Set Ready input for UART1.
MCICLK — Clock output line for SD/MMC interface.
SDA1 — I2C1 data input/output (this is not an open-drain pin).
P0[20] — General purpose digital input/output pin.
DTR1 — Data Terminal Ready output for UART1.
MCICMD — Command line for SD/MMC interface.
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
P0[21] — General purpose digital input/output pin.
RI1 — Ring Indicator input for UART1.
O
I/O
I/O
O
P0[20]/DTR1/
MCICMD/SCL1
I/O
I/O
I/O
I
P0[21]/RI1/
MCIPWR/RD1
O
MCIPWR — Power Supply Enable for external SD/MMC power supply.
RD1 — CAN1 receiver input.
I
P0[22]/RTS1/
MCIDAT0/TD1
I/O
O
P0[22] — General purpose digital input/output pin.
RTS1 — Request to Send output for UART1.
MCIDAT0 — Data line 0 for SD/MMC interface.
TD1 — CAN1 transmitter output.
I/O
O
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
F5[2]
Type
I/O
I
Description
P0[23]/AD0[0]/
I2SRX_CLK/
CAP3[0]
P0[23] — General purpose digital input/output pin.
AD0[0] — A/D converter 0, input 0.
I/O
I2SRX_CLK — Receive Clock. It is driven by the master and received by the
slave. Corresponds to the signal SCK in the I2S-bus specification.
I
CAP3[0] — Capture input for Timer 3, channel 0.
P0[24] — General purpose digital input/output pin.
AD0[1] — A/D converter 0, input 1.
P0[24]/AD0[1]/
I2SRX_WS/
CAP3[1]
E1[2]
I/O
I
I/O
I2SRX_WS — Receive Word Select. It is driven by the master and received by
the slave. Corresponds to the signal WS in the I2S-bus specification.
I
CAP3[1] — Capture input for Timer 3, channel 1.
P0[25] — General purpose digital input/output pin.
AD0[2] — A/D converter 0, input 2.
P0[25]/AD0[2]/
I2SRX_SDA/
TXD3
E4[2]
I/O
I
I/O
I2SRX_SDA — Receive data. It is driven by the transmitter and read by the
receiver. Corresponds to the signal SD in the I2S-bus specification.
O
TXD3 — Transmitter output for UART3.
P0[26]/AD0[3]/
AOUT/RXD3
I/O
I
P0[26] — General purpose digital input/output pin.
AD0[3] — A/D converter 0, input 3.
O
AOUT — D/A converter output.
I
RXD3 — Receiver input for UART3.
P0[27]/SDA0
L3[4]
M1[4]
K5[5]
N4[5]
N1[5]
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P0[27] — General purpose digital input/output pin. Output is open-drain.
SDA0 — I2C0 data input/output. Open-drain output (for I2C-bus compliance).
P0[28] — General purpose digital input/output pin. Output is open-drain.
SCL0 — I2C0 clock input/output. Open-drain output (for I2C-bus compliance).
P0[29] — General purpose digital input/output pin.
USB_D+1 — USB port 1 bidirectional D+ line.
P0[28]/SCL0
P0[29]/USB_D+1
P0[30]/USB_D−1
P0[31]/USB_D+2
P1[0] to P1[31]
P0[30] — General purpose digital input/output pin.
USB_D−1 — USB port 1 bidirectional D− line.
P0[31] — General purpose digital input/output pin.
USB_D+2 — USB port 2 bidirectional D+ line.
Port 1: Port 1 is a 32 bit I/O port with individual direction controls for each bit. The
operation of port 1 pins depends upon the pin function selected via the Pin
Connect block.
P1[0]/
ENET_TXD0
B5[1]
A5[1]
B7[1]
I/O
O
P1[0] — General purpose digital input/output pin.
ENET_TXD0 — Ethernet transmit data 0 (RMII/MII interface).
P1[1] — General purpose digital input/output pin.
ENET_TXD1 — Ethernet transmit data 1 (RMII/MII interface).
P1[2] — General purpose digital input/output pin.
ENET_TXD2 — Ethernet transmit data 2 (MII interface).
MCICLK — Clock output line for SD/MMC interface.
PWM0[1] — Pulse Width Modulator 0, output 1.
P1[1]/
ENET_TXD1
I/O
O
P1[2]/
I/O
O
ENET_TXD2/
MCICLK/
PWM0[1]
O
O
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
A9[1]
Type
I/O
O
Description
P1[3]/
P1[3] — General purpose digital input/output pin.
ENET_TXD3 — Ethernet transmit data 3 (MII interface).
MCICMD — Command line for SD/MMC interface.
PWM0[2] — Pulse Width Modulator 0, output 2.
P1[4] — General purpose digital input/output pin.
ENET_TX_EN — Ethernet transmit data enable (RMII/MII interface).
P1[5] — General purpose digital input/output pin.
ENET_TX_ER — Ethernet Transmit Error (MII interface).
MCIPWR — Power Supply Enable for external SD/MMC power supply.
PWM0[3] — Pulse Width Modulator 0, output 3.
P1[6] — General purpose digital input/output pin.
ENET_TX_CLK — Ethernet Transmit Clock (MII interface).
MCIDAT0 — Data line 0 for SD/MMC interface.
ENET_TXD3/
MCICMD/
PWM0[2]
I/O
O
P1[4]/
ENET_TX_EN
C6[1]
I/O
O
P1[5]/
B13[1]
I/O
O
ENET_TX_ER/
MCIPWR/
PWM0[3]
O
O
P1[6]/
B10[1]
C13[1]
B6[1]
I/O
I
ENET_TX_CLK/
MCIDAT0/
PWM0[4]
I/O
O
PWM0[4] — Pulse Width Modulator 0, output 4.
P1[7] — General purpose digital input/output pin.
ENET_COL — Ethernet Collision detect (MII interface).
MCIDAT1 — Data line 1 for SD/MMC interface.
P1[7]/
I/O
I
ENET_COL/
MCIDAT1/
PWM0[5]
I/O
O
PWM0[5] — Pulse Width Modulator 0, output 5.
P1[8] — General purpose digital input/output pin.
P1[8]/
ENET_CRS_DV/
ENET_CRS
I/O
I
ENET_CRS_DV/ENET_CRS — Ethernet Carrier Sense/Data Valid (RMII
interface)/ Ethernet Carrier Sense (MII interface).
P1[9]/
ENET_RXD0
D7[1]
A7[1]
A12[1]
I/O
I
P1[9] — General purpose digital input/output pin.
ENET_RXD0 — Ethernet receive data 0 (RMII/MII interface).
P1[10] — General purpose digital input/output pin.
ENET_RXD1 — Ethernet receive data 1 (RMII/MII interface).
P1[11] — General purpose digital input/output pin.
ENET_RXD2 — Ethernet Receive Data 2 (MII interface).
MCIDAT2 — Data line 2 for SD/MMC interface.
P1[10]/
ENET_RXD1
I/O
I
P1[11]/
I/O
I
ENET_RXD2/
MCIDAT2/
PWM0[6]
I/O
O
I/O
I
PWM0[6] — Pulse Width Modulator 0, output 6.
P1[12]/
A14[1]
P1[12] — General purpose digital input/output pin.
ENET_RXD3 — Ethernet Receive Data (MII interface).
MCIDAT3 — Data line 3 for SD/MMC interface.
ENET_RXD3/
MCIDAT3/
PCAP0[0]
I/O
I
PCAP0[0] — Capture input for PWM0, channel 0.
P1[13] — General purpose digital input/output pin.
ENET_RX_DV — Ethernet Receive Data Valid (MII interface).
P1[14] — General purpose digital input/output pin.
ENET_RX_ER — Ethernet receive error (RMII/MII interface).
P1[15] — General purpose digital input/output pin.
P1[13]/
ENET_RX_DV
D14[1]
D8[1]
A8[1]
I/O
I
P1[14]/
ENET_RX_ER
I/O
I
P1[15]/
ENET_REF_CLK/
ENET_RX_CLK
I/O
I
ENET_REF_CLK/ENET_RX_CLK — Ethernet Reference Clock (RMII interface)/
Ethernet Receive Clock (MII interface).
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
B8[1]
Type
I/O
O
Description
P1[16]/
ENET_MDC
P1[16] — General purpose digital input/output pin.
ENET_MDC — Ethernet MIIM clock.
P1[17]/
ENET_MDIO
C9[1]
L5[1]
I/O
I/O
I/O
O
P1[17] — General purpose digital input/output pin.
ENET_MDIO — Ethernet MI data input and output.
P1[18] — General purpose digital input/output pin.
P1[18]/
USB_UP_LED1/
PWM1[1]/
CAP1[0]
USB_UP_LED1 — USB port 1 GoodLink LED indicator. It is LOW when device is
configured (non-control endpoints enabled). It is HIGH when the device is not
configured or during global suspend.
O
PWM1[1] — Pulse Width Modulator 1, channel 1 output.
CAP1[0] — Capture input for Timer 1, channel 0.
I
P1[19]/
P5[1]
K6[1]
N6[1]
M6[1]
N7[1]
P7[1]
L7[1]
I/O
O
P1[19] — General purpose digital input/output pin.
USB_TX_E1 — Transmit Enable signal for USB port 1 (OTG transceiver).
USB_PPWR1 — Port Power enable signal for USB port 1.
CAP1[1] — Capture input for Timer 1, channel 1.
USB_TX_E1/
USB_PPWR1/
CAP1[1]
O
I
P1[20]/
USB_TX_DP1/
PWM1[2]/SCK0
I/O
O
P1[20] — General purpose digital input/output pin.
USB_TX_DP1 — D+ transmit data for USB port 1 (OTG transceiver).
PWM1[2] — Pulse Width Modulator 1, channel 2 output.
SCK0 — Serial clock for SSP0.
O
I/O
I/O
O
P1[21]/
USB_TX_DM1/
PWM1[3]/SSEL0
P1[21] — General purpose digital input/output pin.
USB_TX_DM1 — D− transmit data for USB port 1 (OTG transceiver).
PWM1[3] — Pulse Width Modulator 1, channel 3 output.
SSEL0 — Slave Select for SSP0.
O
I/O
I/O
I
P1[22]/
P1[22] — General purpose digital input/output pin.
USB_RCV1 — Differential receive data for USB port 1 (OTG transceiver).
USB_PWRD1 — Power Status for USB port 1 (host power switch).
MAT1[0] — Match output for Timer 1, channel 0.
USB_RCV1/
USB_PWRD1/
MAT1[0]
I
O
P1[23]/
USB_RX_DP1/
PWM1[4]/MISO0
I/O
I
P1[23] — General purpose digital input/output pin.
USB_RX_DP1 — D+ receive data for USB port 1 (OTG transceiver).
PWM1[4] — Pulse Width Modulator 1, channel 4 output.
MISO0 — Master In Slave Out for SSP0.
O
I/O
I/O
I
P1[24]/
USB_RX_DM1/
PWM1[5]/MOSI0
P1[24] — General purpose digital input/output pin.
USB_RX_DM1 — D− receive data for USB port 1 (OTG transceiver).
PWM1[5] — Pulse Width Modulator 1, channel 5 output.
MOSI0 — Master Out Slave in for SSP0.
O
I/O
I/O
O
P1[25]/
P1[25] — General purpose digital input/output pin.
USB_LS1 — Low-speed status for USB port 1 (OTG transceiver).
USB_HSTEN1 — Host Enabled status for USB port 1.
MAT1[1] — Match output for Timer 1, channel 1.
USB_LS1/
USB_HSTEN1/
MAT1[1]
O
O
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
Type
Description
P1[26]/
P8[1]
I/O
O
O
I
P1[26] — General purpose digital input/output pin.
USB_SSPND1 — USB port 1 Bus Suspend status (OTG transceiver).
PWM1[6] — Pulse Width Modulator 1, channel 6 output.
CAP0[0] — Capture input for Timer 0, channel 0.
P1[27] — General purpose digital input/output pin.
USB_INT1 — USB port 1 OTG transceiver interrupt.
USB_OVRCR1 — USB port 1 Over-Current status.
CAP0[1] — Capture input for Timer 0, channel 1.
P1[28] — General purpose digital input/output pin.
USB_SCL1 — USB port 1 I2C serial clock (OTG transceiver).
PCAP1[0] — Capture input for PWM1, channel 0.
MAT0[0] — Match output for Timer 0, channel 0.
P1[29] — General purpose digital input/output pin.
USB_SDA1 — USB port 1 I2C serial data (OTG transceiver).
PCAP1[1] — Capture input for PWM1, channel 1.
MAT0[1] — Match output for Timer 0, channel 0.
P1[30] — General purpose digital input/output pin.
USB_PWRD2 — Power Status for USB port 2.
VBUS — Monitors the presence of USB bus power.
Note: This signal must be HIGH for USB reset to occur.
AD0[4] — A/D converter 0, input 4.
USB_SSPND1/
PWM1[6]/
CAP0[0]
P1[27]/
M9[1]
P10[1]
N10[1]
K3[2]
I/O
I
USB_INT1/
USB_OVRCR1/
CAP0[1]
I
I
P1[28]/
I/O
I/O
I
USB_SCL1/
PCAP1[0]/
MAT0[0]
O
I/O
I/O
I
P1[29]/
USB_SDA1/
PCAP1[1]/
MAT0[1]
O
I/O
I
P1[30]/
USB_PWRD2/
VBUS/AD0[4]
I
I
P1[31]/
USB_OVRCR2/
SCK1/AD0[5]
K2[2]
I/O
I
P1[31] — General purpose digital input/output pin.
USB_OVRCR2 — Over-Current status for USB port 2.
SCK1 — Serial Clock for SSP1.
I/O
I
AD0[5] — A/D converter 0, input 5.
P2[0] to P2[31]
I/O
Port 2: Port 2 is a 32-bit I/O port with individual direction controls for each bit. The
operation of port 2 pins depends upon the pin function selected via the Pin
Connect block.
Pins P2[14:15], P2[22:23], P2[26:27] and P2[30:31] are not available.
P2[0] — General purpose digital input/output pin.
PWM1[1] — Pulse Width Modulator 1, channel 1 output.
TXD1 — Transmitter output for UART1.
P2[0]/PWM1[1]/
TXD1/
TRACECLK
D12[1]
C14[1]
E11[1]
I/O
O
O
O
I/O
O
I
TRACECLK — Trace Clock.
P2[1]/PWM1[2]/
RXD1/
PIPESTAT0
P2[1] — General purpose digital input/output pin.
PWM1[2] — Pulse Width Modulator 1, channel 2 output.
RXD1 — Receiver input for UART1.
O
I/O
O
I
PIPESTAT0 — Pipeline Status, bit 0.
P2[2]/PWM1[3]/
CTS1/
PIPESTAT1
P2[2] — General purpose digital input/output pin.
PWM1[3] — Pulse Width Modulator 1, channel 3 output.
CTS1 — Clear to Send input for UART1.
O
PIPESTAT1 — Pipeline Status, bit 1.
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
E13[1]
Type
I/O
O
Description
P2[3]/PWM1[4]/
DCD1/
PIPESTAT2
P2[3] — General purpose digital input/output pin.
PWM1[4] — Pulse Width Modulator 1, channel 4 output.
DCD1 — Data Carrier Detect input for UART1.
PIPESTAT2 — Pipeline Status, bit 2.
I
O
P2[4]/PWM1[5]/
DSR1/
TRACESYNC
E14[1]
I/O
O
P2[4] — General purpose digital input/output pin.
PWM1[5] — Pulse Width Modulator 1, channel 5 output.
DSR1 — Data Set Ready input for UART1.
TRACESYNC — Trace Synchronization.
P2[5] — General purpose digital input/output pin.
PWM1[6] — Pulse Width Modulator 1, channel 6 output.
DTR1 — Data Terminal Ready output for UART1.
TRACEPKT0 — Trace Packet, bit 0.
I
O
P2[5]/PWM1[6]/
DTR1/
TRACEPKT0
F12[1]
I/O
O
O
O
P2[6]/PCAP1[0]/RI1/ F13[1]
TRACEPKT1
I/O
I
P2[6] — General purpose digital input/output pin.
PCAP1[0] — Capture input for PWM1, channel 0.
RI1 — Ring Indicator input for UART1.
I
O
TRACEPKT1 — Trace Packet, bit 1.
P2[7]/RD2/
RTS1/
TRACEPKT2
G11[1]
G14[1]
H11[1]
I/O
I
P2[7] — General purpose digital input/output pin.
RD2 — CAN2 receiver input.
O
RTS1 — Request to Send output for UART1.
TRACEPKT2 — Trace Packet, bit 2.
O
P2[8]/TD2/
TXD2/
TRACEPKT3
I/O
O
P2[8] — General purpose digital input/output pin.
TD2 — CAN2 transmitter output.
O
TXD2 — Transmitter output for UART2.
O
TRACEPKT3 — Trace Packet, bit 3.
P2[9]/
USB_CONNECT1/
RXD2/
I/O
O
P2[9] — General purpose digital input/output pin.
USB_CONNECT1 — USB1 SoftConnect control. Signal used to switch an
external 1.5 kΩ resistor under the software control. Used with the SoftConnect
USB feature.
EXTIN0
I
RXD2 — Receiver input for UART2.
I
EXTIN0 — External Trigger Input.
P2[10]/EINT0
M13[6]
M12[6]
I/O
P2[10] — General purpose digital input/output pin.
Note: LOW on this pin while RESET is LOW forces on-chip bootloader to take
over control of the part after a reset.
I
EINT0 — External interrupt 0 input.
P2[11]/EINT1/
MCIDAT1/
I2STX_CLK
I/O
I
P2[11] — General purpose digital input/output pin.
EINT1 — External interrupt 1 input.
I/O
I/O
MCIDAT1 — Data line 1 for SD/MMC interface.
I2STX_CLK — Transmit Clock. It is driven by the master and received by the
slave. Corresponds to the signal SCK in the I2S-bus specification.
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
N14[6]
Type
I/O
I
Description
P2[12]/EINT2/
MCIDAT2/
I2STX_WS
P2[12] — General purpose digital input/output pin.
EINT2 — External interrupt 2 input.
I/O
I/O
MCIDAT2 — Data line 2 for SD/MMC interface.
I2STX_WS — Transmit Word Select. It is driven by the master and received by
the slave. Corresponds to the signal WS in the I2S-bus specification.
P2[13]/EINT3/
MCIDAT3/
I2STX_SDA
M11[6]
I/O
I
P2[13] — General purpose digital input/output pin.
EINT3 — External interrupt 3 input.
I/O
I/O
MCIDAT3 — Data line 3 for SD/MMC interface.
I2STX_SDA — Transmit data. It is driven by the transmitter and read by the
receiver. Corresponds to the signal SD in the I2S-bus specification.
P2[16]/CAS
P2[17]/RAS
P9[1]
P11[1]
P3[1]
N5[1]
P6[1]
N8[1]
P1[1]
P2[1]
M2[1]
L1[1]
I/O
O
P2[16] — General purpose digital input/output pin.
CAS — LOW active SDRAM Column Address Strobe.
P2[17] — General purpose digital input/output pin.
RAS — LOW active SDRAM Row Address Strobe.
P2[18] — General purpose digital input/output pin.
CLKOUT0 — SDRAM clock 0.
I/O
O
P2[18]/
CLKOUT0
I/O
O
P2[19]/
CLKOUT1
I/O
O
P2[19] — General purpose digital input/output pin.
CLKOUT1 — SDRAM clock 1.
P2[20]/DYCS0
I/O
O
P2[20] — General purpose digital input/output pin.
DYCS0 — SDRAM chip select 0.
P2[21]/DYCS1
I/O
O
P2[21] — General purpose digital input/output pin.
DYCS1 — SDRAM chip select 1.
P2[24]/
CKEOUT0
I/O
O
P2[24] — General purpose digital input/output pin.
CKEOUT0 — SDRAM clock enable 0.
P2[25]/
CKEOUT1
I/O
O
P2[25] — General purpose digital input/output pin.
CKEOUT1 — SDRAM clock enable 1.
P2[28]/
DQMOUT0
I/O
O
P2[28] — General purpose digital input/output pin.
DQMOUT0 — Data mask 0 used with SDRAM and static devices.
P2[29] — General purpose digital input/output pin.
DQMOUT1 — Data mask 1 used with SDRAM and static devices.
P2[29]/
DQMOUT1
I/O
O
P3[0] to P3[31]
I/O
Port 3: Port 3 is a 32-bit I/O port with individual direction controls for each bit. The
operation of port 3 pins depends upon the pin function selected via the Pin
Connect block.
Pins P3[16:22] and P3[27:31] are not available.
P3[0] — General purpose digital input/output pin.
D0 — External memory data line 0.
P3[0]/D0
P3[1]/D1
P3[2]/D2
P3[3]/D3
D6[1]
E6[1]
A2[1]
G5[1]
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P3[1] — General purpose digital input/output pin.
D1 — External memory data line 1.
P3[2] — General purpose digital input/output pin.
D2 — External memory data line 2.
P3[3] — General purpose digital input/output pin.
D3 — External memory data line 3.
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
D3[1]
Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
Description
P3[4]/D4
P3[4] — General purpose digital input/output pin.
D4 — External memory data line 4.
P3[5]/D5
E3[1]
F4[1]
G3[1]
A6[1]
A4[1]
B3[1]
B2[1]
A1[1]
C1[1]
F1[1]
G4[1]
M4[1]
P3[5] — General purpose digital input/output pin.
D5 — External memory data line 5.
P3[6]/D6
P3[6] — General purpose digital input/output pin.
D6 — External memory data line 6.
P3[7]/D7
P3[7] — General purpose digital input/output pin.
D7 — External memory data line 7.
P3[8]/D8
P3[8] — General purpose digital input/output pin.
D8 — External memory data line 8.
P3[9]/D9
P3[9] — General purpose digital input/output pin.
D9 — External memory data line 9.
P3[10]/D10
P3[11]/D11
P3[12]/D12
P3[13]/D13
P3[14]/D14
P3[15]/D15
P3[10] — General purpose digital input/output pin.
D10 — External memory data line 10.
P3[11] — General purpose digital input/output pin.
D11 — External memory data line 11.
P3[12] — General purpose digital input/output pin.
D12 — External memory data line 12.
P3[13] — General purpose digital input/output pin.
D13 — External memory data line 13.
P3[14] — General purpose digital input/output pin.
D14 — External memory data line 14.
P3[15] — General purpose digital input/output pin.
D15 — External memory data line 15.
P3[23]/CAP0[0]/
PCAP1[0]
P3[23] — General purpose digital input/output pin.
CAP0[0] — Capture input for Timer 0, channel 0.
PCAP1[0] — Capture input for PWM1, channel 0.
P3[24] — General purpose digital input/output pin.
CAP0[1] — Capture input for Timer 0, channel 1.
PWM1[1] — Pulse Width Modulator 1, output 1.
P3[25] — General purpose digital input/output pin.
MAT0[0] — Match output for Timer 0, channel 0.
PWM1[2] — Pulse Width Modulator 1, output 2.
P3[26] — General purpose digital input/output pin.
MAT0[1] — Match output for Timer 0, channel 1.
PWM1[3] — Pulse Width Modulator 1, output 3.
I
P3[24]/CAP0[1]/
PWM1[1]
N3[1]
M3[1]
K7[1]
I/O
I
O
P3[25]/MAT0[0]/
PWM1[2]
I/O
O
O
P3[26]/MAT0[1]/
PWM1[3]
I/O
O
O
P4[0] to P4[31]
I/O
Port 4: Port 4 is a 32-bit I/O port with individual direction controls for each bit. The
operation of port 4 pins depends upon the pin function selected via the Pin
Connect block.
Pins P4[20:23] not available.
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
L6[1]
Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Description
P4[0]/A0
P4[0] — General purpose digital input/output pin.
A0 — External memory address line 0.
P4[1]/A1
M7[1]
P4[1] — General purpose digital input/output pin.
A1 — External memory address line 1.
P4[2]/A2
M8[1]
P4[2] — General purpose digital input/output pin.
A2 — External memory address line 2.
P4[3]/A3
K9[1]
P4[3] — General purpose digital input/output pin.
A3 — External memory address line 3.
P4[4]/A4
P13[1]
H10[1]
K10[1]
K12[1]
J11[1]
H12[1]
G12[1]
F11[1]
F10[1]
B14[1]
E8[1]
P4[4] — General purpose digital input/output pin.
A4 — External memory address line 4.
P4[5]/A5
P4[5] — General purpose digital input/output pin.
A5 — External memory address line 5.
P4[6]/A6
P4[6] — General purpose digital input/output pin.
A6 — External memory address line 6.
P4[7]/A7
P4[7] — General purpose digital input/output pin.
A7 — External memory address line 7.
P4[8]/A8
P4[8] — General purpose digital input/output pin.
A8 — External memory address line 8.
P4[9]/A9
P4[9] — General purpose digital input/output pin.
A9 — External memory address line 9.
P4[10]/A10
P4[11]/A11
P4[12]/A12
P4[13]/A13
P4[14]/A14
P4[15]/A15
P4[16]/A16
P4[17]/A17
P4[18]/A18
P4[19]/A19
P4[10] — General purpose digital input/output pin.
A10 — External memory address line 10.
P4[11] — General purpose digital input/output pin.
A11 — External memory address line 11.
P4[12] — General purpose digital input/output pin.
A12 — External memory address line 12.
P4[13] — General purpose digital input/output pin.
A13 — External memory address line 13.
P4[14] — General purpose digital input/output pin.
A14 — External memory address line 14.
P4[15] — General purpose digital input/output pin.
A15 — External memory address line 15.
P4[16] — General purpose digital input/output pin.
A16 — External memory address line 16.
P4[17] — General purpose digital input/output pin.
A17 — External memory address line 17.
P4[18] — General purpose digital input/output pin.
A18 — External memory address line 18.
P4[19] — General purpose digital input/output pin.
A19 — External memory address line 19.
C10[1]
N12[1]
N13[1]
P14[1]
M14[1]
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
C8[1]
Type
I/O
O
Description
P4[24]/OE
P4[24] — General purpose digital input/output pin.
OE — LOW active Output Enable signal.
P4[25]/WE
D9[1]
I/O
O
P4[25] — General purpose digital input/output pin.
WE — LOW active Write Enable signal.
P4[26]/BLS0
P4[27]/BLS1
K13[1]
F14[1]
D10[1]
I/O
O
P4[26] — General purpose digital input/output pin.
BLS0 — LOW active Byte Lane select signal 0.
P4[27] — General purpose digital input/output pin.
BLS1 — LOW active Byte Lane select signal 1.
P4[28] — General purpose digital input/output pin.
MAT2[0] — Match output for Timer 2, channel 0.
TXD3 — Transmitter output for UART3.
I/O
O
P4[28]/MAT2[0]/
TXD3
I/O
O
O
P4[29]/MAT2[1]/
RXD3
B9[1]
I/O
O
P4[29] — General purpose digital input/output pin.
MAT2[1] — Match output for Timer 2, channel 1.
RXD3 — Receiver input for UART3.
I
P4[30]/CS0
P4[31]/CS1
ALARM
C7[1]
E7[1]
H5[8]
I/O
O
P4[30] — General purpose digital input/output pin.
CS0 — LOW active Chip Select 0 signal.
I/O
O
P4[31] — General purpose digital input/output pin.
CS1 — LOW active Chip Select 1 signal.
O
ALARM — RTC controlled output. This is a 1.8 V pin. It goes HIGH when a RTC
alarm is generated.
USB_D−2
DBGEN
TDO
N2
I/O
USB_D−2 — USB port 2 bidirectional D− line.
DBGEN — JTAG interface control signal. Also used for boundary scan.
TDO — Test Data Out for JTAG interface.
E5[1]
B1[1]
C3[1]
C2[1]
D4[1]
D2[1]
I
O
I
TDI
TDI — Test Data In for JTAG interface.
TMS
I
TMS — Test Mode Select for JTAG interface.
TRST — Test Reset for JTAG interface.
TCK — Test Clock for JTAG interface. This clock must be slower than 1⁄6 of the
TRST
TCK
I
I
CPU clock (CCLK) for the JTAG interface to operate.
RTCK
C4[1]
I/O
RTCK — JTAG interface control signal.
Note: LOW on this pin while RESET is LOW enables ETM pins (P2[9:0]) to
operate as Trace port after reset.
RSTOUT
RESET
H2
O
I
RSTOUT — This is a 3.3 V pin. LOW on this pin indicates UM10237 being in
Reset state.
J1[7]
external reset input: A LOW on this pin resets the device, causing I/O ports and
peripherals to take on their default states, and processor execution to begin at
address 0. TTL with hysteresis, 5 V tolerant.
XTAL1
XTAL2
RTCX1
RTCX2
L2[8]
K4[8]
J2[8]
J3[8]
I
Input to the oscillator circuit and internal clock generator circuits.
Output from the oscillator amplifier.
O
I
Input to the RTC oscillator circuit.
O
Output from the RTC oscillator circuit.
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Chapter 8: LPC24XX Pin configuration
Table 120. Pin description …continued
Symbol
Ball
Type
Description
VSSIO
H4, P4,
L9, L13,
G13,
I
ground: 0 V reference for the digital IO pins.
D13,
C11,
B4[9]
VSSCORE
VSSA
H3, L8,
A10[9]
F3[10]
I
I
I
ground: 0 V reference for the core.
analog ground: 0 V reference. This should nominally be the same voltage as
VSSIO/VSSCORE, but should be isolated to minimize noise and error.
VDD(3V3)
E2, L4,
K8, L11,
J14, E12,
E10,
3.3 V supply voltage: This is the power supply voltage for the I/O ports.
C5[11]
n.c.
H1, L12,
G10[12]
I
I
I
not connected pins: These pins must be left unconnected (floating).
VDD(DCDC)(3V3)
VDDA
G1, N9,
E9[13]
3.3 V DC-to-DC converter supply voltage: This is the power supply for the
on-chip DC-to-DC converter.
F2[14]
G2[14]
K1[14]
analog 3.3 V pad supply voltage: This should be nominally the same voltage as
VDD(3V3) but should be isolated to minimize noise and error. This voltage is used
to power the ADC and DAC.
VREF
VBAT
I
I
ADC reference: This should be nominally the same voltage as VDD(3V3) but
should be isolated to minimize noise and error. The level on this pin is used as a
reference for ADC and DAC.
RTC power supply: 3.3 V on this pin supplies the power to the RTC peripheral.
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
[2] 5 V tolerant pad providing digital I/O functions (with TTL levels and hysteresis) and analog input. When configured as a ADC input,
digital section of the pad is disabled.
[3] 5 V tolerant pad providing digital I/O with TTL levels and hysteresis and analog output function. When configured as the DAC output,
digital section of the pad is disabled.
[4] Open-drain 5 V tolerant digital I/O pad, compatible with I2C-bus 400 kHz specification. It requires an external pull-up to provide output
functionality. When power is switched off, this pin connected to the I2C-bus is floating and does not disturb the I2C lines. Open-drain
configuration applies to all functions on this pin.
[5] Pad provides digital I/O and USB functions. It is designed in accordance with the USB specification, revision 2.0 (Full-speed and
Low-speed mode only).
[6] 5 V tolerant pad with 5 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.
[7] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
[8] Pad provides special analog functionality.
[9] Pad provides special analog functionality.
[10] Pad provides special analog functionality.
[11] Pad provides special analog functionality.
[12] Pad provides special analog functionality.
[13] Pad provides special analog functionality.
[14] Pad provides special analog functionality.
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Chapter 8: LPC24XX Pin configuration
4. LPC2460/68 pinning information
Table 121. LPC2420/60/68 pin allocation table
CAN and Ethernet pins for LPC2460/68 only.
Pin Symbol
Row A
Pin Symbol
Pin Symbol
Pin Symbol
1
P3[27]/D27/
CAP1[0]/PWM1[4]
2
6
VSSIO
3
7
P1[0]/ENET_TXD0
P1[14]/ENET_RX_ER
4
8
P4[31]/CS1
5
P1[4]/ENET_TX_EN
P1[9]/ENET_RXD0
P1[15]/
ENET_REF_CLK/
ENET_RX_CLK
9
P1[17]/ENET_MDIO
10 P1[3]/ENET_TXD3/
MCICMD/PWM0[2]
11 P4[15]/A15
12 VSSIO
13 P3[20]/D20/
PWM0[5]/DSR1
14 P1[11]/ENET_RXD2/
MCIDAT2/PWM0[6]
15 P0[8]/I2STX_WS/
MISO1/MAT2[2]
16 P1[12]/ENET_RXD3/
MCIDAT3/PCAP0[0]
17 P1[5]/ENET_TX_ER/
MCIPWR/PWM0[3]
-
-
-
Row B
1
5
9
P3[2]/D2
2
6
P3[10]/D10
VSSIO
3
7
P3[1]/D1
4
8
P3[0]/D0
P1[1]/ENET_TXD1
P4[25]/WE
P4[30]/CS0
P4[24]/OE
10 P4[29]/BLS3/
MAT2[1]/RXD3
11 P1[6]/ENET_TX_CLK/
MCIDAT0/PWM0[4]
12 P0[4]/I2SRX_CLK/RD2/
CAP2[0]
13 VDD(3V3)
14 P3[19]/D19/
PWM0[4]/DCD1
15 P4[14]/A14
16 P4[13]/A13
17 P2[0]/PWM1[1]/TXD1/
TRACECLK
-
-
-
Row C
1
5
P3[13]/D13
P3[9]/D9
2
6
TDI
3
7
RTCK
4
8
P0[2]/TXD0
P3[22]/D22/
PCAP0[0]/RI1
P1[8]/ENET_CRS_DV/
ENET_CRS
P1[10]/ENET_RXD1
9
VDD(3V3)
10 P3[21]/D21/
PWM0[6]/DTR1
11 P4[28]/BLS2/
MAT2[0]/TXD3
12 P0[5]/I2SRX_WS/TD2/
CAP2[1]
13 P0[7]/I2STX_CLK/SCK1 14 P0[9]/I2STX_SDA/
15 P3[18]/D18/
PWM0[3]/CTS1
16 P4[12]/A12
/MAT2[1]
17 VDD(3V3)
Row D
MOSI1/MAT2[3]
-
-
-
1
TRST
2
6
P3[28]/D28/
CAP1[1]/PWM1[5]
3
7
TDO
4
8
P3[12]/D12
P3[8]/D8
5
9
P3[11]/D11
P0[3]/RXD0
VDD(3V3)
P1[2]/ENET_TXD2/
MCICLK/PWM0[1]
10 P1[16]/ENET_MDC
11 VDD(DCDC)(3V3)
12 VSSCORE
13 P0[6]/I2SRX_SDA/
SSEL1/MAT2[0]
14 P1[7]/ENET_COL/
MCIDAT1/PWM0[5]
15 P2[2]/PWM1[3]/
CTS1/PIPESTAT1
16 P1[13]/ENET_RX_DV
-
17 P2[4]/PWM1[5]/
DSR1/TRACESYNC
-
-
Row E
1
P0[26]/AD0[3]/
AOUT/RXD3
2
TCK
3
TMS
4
P3[3]/D3
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Chapter 8: LPC24XX Pin configuration
Table 121. LPC2420/60/68 pin allocation table …continued
CAN and Ethernet pins for LPC2460/68 only.
Pin Symbol
Pin Symbol
Pin Symbol
Pin Symbol
14 P2[1]/PWM1[2]/RXD1/ 15 VSSIO
PIPESTAT0
16 P2[3]/PWM1[4]/
DCD1/PIPESTAT2
17 P2[6]/PCAP1[0]/
RI1/TRACEPKT1
Row F
1
P0[25]/AD0[2]/
2
P3[4]/D4
3
P3[29]/D29/
4
DBGEN
I2SRX_SDA/TXD3
MAT1[0]/PWM1[6]
14 P4[11]/A11
15 P3[17]/D17/
PWM0[2]/RXD1
16 P2[5]/PWM1[6]/
DTR1/TRACEPKT0
17 P3[16]/D16/
PWM0[1]/TXD1
Row G
1
P3[5]/D5
2
P0[24]/AD0[1]/
I2SRX_WS/CAP3[1]
3
VDD(3V3)
4
VDDA
14 NC
15 P4[27]/BLS1
16 P2[7]/RD2/
RTS1/TRACEPKT2
17 P4[10]/A10
Row H
1
P0[23]/AD0[0]/
I2SRX_CLK/CAP3[0]
2
P3[14]/D14
3
P3[30]/D30/
MAT1[1]/RTS1
4
VDD(DCDC)(3V3)
14 VSSIO
15 P2[8]/TD2/
TXD2/TRACEPKT3
16 P2[9]/
USB_CONNECT1/
17 P4[9]/A9
RXD2/EXTIN0
Row J
1
P3[6]/D6
2
VSSA
3
P3[31]/D31/MAT1[2]
4
NC
14 P0[16]/RXD1/
SSEL0/SSEL
15 P4[23]/A23/
RXD2/MOSI1
16 P0[15]/TXD1/
SCK0/SCK
17 P4[8]/A8
Row K
1
VREF
2
RTCX1
3
RSTOUT
4
VSSCORE
14 P4[22]/A22/
TXD2/MISO1
15 P0[18]/DCD1/
MOSI0/MOSI
16 VDD(3V3)
17 P0[17]/CTS1/
MISO0/MISO
Row L
1
P3[7]/D7
2
RTCX2
3
VSSIO
4
P2[30]/DQMOUT2/
MAT3[2]/SDA2
14 NC
15 P4[26]/BLS0
16 P4[7]/A7
17 P0[19]/DSR1/
MCICLK/SDA1
Row M
1
P3[15]/D15
2
RESET
3
VBAT
4
XTAL1
14 P4[6]/A6
15 P4[21]/A21/
SCL2/SSEL1
16 P0[21]/RI1/
MCIPWR/RD1
17 P0[20]/DTR1/
MCICMD/SCL1
Row N
1
ALARM
2
P2[31]/DQMOUT3/
MAT3[3]/SCL2
3
P2[29]/DQMOUT1
4
XTAL2
14 P2[12]/EINT2/
MCIDAT2/I2STX_WS
15 P2[10]/EINT0
16 VSSIO
17 P0[22]/RTS1/
MCIDAT0/TD1
Row P
1
P1[31]/USB_OVRCR2/
SCK1/AD0[5]
2
6
P1[30]/USB_PWRD2/
BUS/AD0[4]
3
7
P2[27]/CKEOUT3/
MAT3[1]/MOSI0
4
8
P2[28]/DQMOUT0
VDD(3V3)
V
5
P2[24]/CKEOUT0
VDD(3V3)
P1[18]/USB_UP_LED1/
PWM1[1]/CAP1[0]
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Chapter 8: LPC24XX Pin configuration
Table 121. LPC2420/60/68 pin allocation table …continued
CAN and Ethernet pins for LPC2460/68 only.
Pin Symbol
P1[23]/USB_RX_DP1/
PWM1[4]/MISO0
Pin Symbol
Pin Symbol
Pin Symbol
9
10 VSSCORE
11 VDD(DCDC)(3V3)
12 VSSIO
13 P2[15]/CS3/
CAP2[1]/SCL1
14 P4[17]/A17
-
15 P4[18]/A18
-
16 P4[19]/A19
-
17 VDD(3V3)
Row R
1
5
9
P0[12]/USB_PPWR2/
MISO1/AD0[6]
2
6
P0[13]/USB_UP_LED2/
MOSI1/AD0[7]
3
7
P0[28]/SCL0
4
8
P2[25]/CKEOUT1
P3[24]/D24/
CAP0[1]/PWM1[1]
P0[30]/USB_D−1
P2[19]/CLKOUT1
P1[21]/USB_TX_DM1/
PWM1[3]/SSEL0
VSSIO
10 P1[26]/USB_SSPND1/ 11 P2[16]/CAS
PWM1[6]/CAP0[0]
12 P2[14]/CS2/
CAP2[0]/SDA1
13 P2[17]/RAS
14 P0[11]/RXD2/SCL2/
MAT3[1]
15 P4[4]/A4
16 P4[5]/A5
17 P4[20]/A20/
SDA2/SCK1
-
-
-
Row T
1
P0[27]/SDA0
2
6
P0[31]/USB_D+2
3
7
P3[26]/D26/
MAT0[1]/PWM1[3]
4
8
P2[26]/CKEOUT2/
MAT3[0]/MISO0
5
VSSIO
P3[23]/D23/
CAP0[0]/PCAP1[0]
P0[14]/USB_HSTEN2/
USB_CONNECT2/
SSEL1
P2[20]/DYCS0
9
P1[24]/USB_RX_DM1/ 10 P1[25]/USB_LS1/
PWM1[5]/MOSI0 USB_HSTEN1/MAT1[1]
11 P4[2]/A2
12 P1[27]/USB_INT1/
USB_OVRCR1/CAP0[1]
13 P1[28]/USB_SCL1/
PCAP1[0]/MAT0[0]
14 P0[1]/TD1/RXD3/SCL1 15 P0[10]/TXD2/SDA2/
MAT3[0]
16 P2[13]/EINT3/
MCIDAT3/I2STX_SDA
17 P2[11]/EINT1/
-
-
-
MCIDAT1/I2STX_CLK
Row U
1
5
9
USB_D−2
2
6
P3[25]/D25/
MAT0[0]/PWM1[2]
3
7
P2[18]/CLKOUT0
4
8
P0[29]/USB_D+1
P2[23]/DYCS3/
CAP3[1]/SSEL0
P1[19]/USB_TX_E1/
USB_PPWR1/CAP1[1]
P1[20]/USB_TX_DP1/
PWM1[2]/SCK0
P1[22]/USB_RCV1/
USB_PWRD1/MAT1[0]
P4[0]/A0
10 P4[1]/A1
11 P2[21]/DYCS1
12 P2[22]/DYCS2/
CAP3[0]/SCK0
13 VDD(3V3)
14 P1[29]/USB_SDA1/
PCAP1[1]/MAT0[1]
15 P0[0]/RD1/TXD3/SDA1 16 P4[3]/A3
17 P4[16]/A16
-
-
-
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description
Symbol
Pin
Ball
Type Description
P0[0] to P0[31]
I/O
Port 0: Port 0 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 0 pins depends upon the pin function selected
via the Pin Connect block.
P0[0]/RD1/
TXD3/SDA1
94[1]
U15[1]
I/O
I
P0[0] — General purpose digital input/output pin.
RD1 — CAN1 receiver input (LPC2460 only).
TXD3 — Transmitter output for UART3.
O
I/O
I/O
O
SDA1 — I2C1 data input/output (this is not an open-drain pin).
P0[1] — General purpose digital input/output pin.
TD1 — CAN1 transmitter output (LPC2460 only).
RXD3 — Receiver input for UART3.
P0[1]/TD1/RXD3/
SCL1
96[1]
T14[1]
I
I/O
I/O
O
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
P0[2] — General purpose digital input/output pin.
TXD0 — Transmitter output for UART0.
P0[2]/TXD0
P0[3]/RXD0
202[1]
204[1]
168[1]
C4[1]
D6[1]
B12[1]
I/O
I
P0[3] — General purpose digital input/output pin.
RXD0 — Receiver input for UART0.
P0[4]/
I2SRX_CLK/
RD2/CAP2[0]
I/O
I/O
P0[4] — General purpose digital input/output pin.
I2SRX_CLK — Receive Clock. It is driven by the master and received by
the slave. Corresponds to the signal SCK in the I2S-bus specification.
I
RD2 — CAN2 receiver input (LPC2460 only).
CAP2[0] — Capture input for Timer 2, channel 0.
P0[5] — General purpose digital input/output pin.
I
P0[5]/
166[1]
C12[1]
I/O
I/O
I2SRX_WS/
TD2/CAP2[1]
I2SRX_WS — Receive Word Select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
specification.
O
TD2 — CAN2 transmitter output (LPC2460 only).
CAP2[1] — Capture input for Timer 2, channel 1.
P0[6] — General purpose digital input/output pin.
I
P0[6]/
I2SRX_SDA/
SSEL1/MAT2[0]
164[1]
162[1]
160[1]
D13[1]
C13[1]
A15[1]
I/O
I/O
I2SRX_SDA — Receive data. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the I2S-bus specification.
I/O
O
SSEL1 — Slave Select for SSP1.
MAT2[0] — Match output for Timer 2, channel 0.
P0[7] — General purpose digital input/output pin.
P0[7]/
I2STX_CLK/
SCK1/MAT2[1]
I/O
I/O
I2STX_CLK — Transmit Clock. It is driven by the master and received by
the slave. Corresponds to the signal SCK in the I2S-bus specification.
I/O
O
SCK1 — Serial Clock for SSP1.
MAT2[1] — Match output for Timer 2, channel 1.
P0[8] — General purpose digital input/output pin.
P0[8]/
I/O
I/O
I2STX_WS/
MISO1/MAT2[2]
I2STX_WS — Transmit Word Select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
specification.
I/O
O
MISO1 — Master In Slave Out for SSP1.
MAT2[2] — Match output for Timer 2, channel 2.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P0[9]/
I2STX_SDA/
MOSI1/MAT2[3]
158[1]
C14[1]
I/O
I/O
P0[9] — General purpose digital input/output pin.
I2STX_SDA — Transmit data. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the I2S-bus specification.
I/O
O
MOSI1 — Master Out Slave In for SSP1.
MAT2[3] — Match output for Timer 2, channel 3.
P0[10] — General purpose digital input/output pin.
TXD2 — Transmitter output for UART2.
P0[10]/TXD2/
SDA2/MAT3[0]
98[1]
100[1]
41[2]
45[2]
T15[1]
R14[1]
R1[2]
I/O
O
I/O
O
SDA2 — I2C2 data input/output (this is not an open-drain pin).
MAT3[0] — Match output for Timer 3, channel 0.
P0[11] — General purpose digital input/output pin.
RXD2 — Receiver input for UART2.
P0[11]/RXD2/
SCL2/MAT3[1]
I/O
I
I/O
O
SCL2 — I2C2 clock input/output (this is not an open-drain pin).
MAT3[1] — Match output for Timer 3, channel 1.
P0[12] — General purpose digital input/output pin.
USB_PPWR2 — Port Power enable signal for USB port 2.
MISO1 — Master In Slave Out for SSP1.
P0[12]/
USB_PPWR2/
MISO1/AD0[6]
I/O
O
I/O
I
AD0[6] — A/D converter 0, input 6.
P0[13]/
R2[2]
I/O
O
P0[13] — General purpose digital input/output pin.
USB_UP_LED2/
MOSI1/AD0[7]
USB_UP_LED2 — USB port 2 GoodLink LED indicator. It is LOW when
device is configured (non-control endpoints enabled). It is HIGH when the
device is not configured or during global suspend.
I/O
I
MOSI1 — Master Out Slave In for SSP1.
AD0[7] — A/D converter 0, input 7.
P0[14]/
69[1]
T7[1]
I/O
O
P0[14] — General purpose digital input/output pin.
USB_HSTEN2 — Host Enabled status for USB port 2.
USB_HSTEN2/
USB_CONNECT2/
SSEL1
O
USB_CONNECT2 — SoftConnect control for USB port 2. Signal used to
switch an external 1.5 kΩ resistor under software control. Used with the
SoftConnect USB feature.
I/O
I/O
O
SSEL1 — Slave Select for SSP1.
P0[15]/TXD1/
SCK0/SCK
128[1]
130[1]
126[1]
J16[1]
J14[1]
K17[1]
P0[15] — General purpose digital input/output pin.
TXD1 — Transmitter output for UART1.
SCK0 — Serial clock for SSP0.
I/O
I/O
I/O
I
SCK — Serial clock for SPI.
P0[16]/RXD1/
SSEL0/SSEL
P0 [16] — General purpose digital input/output pin.
RXD1 — Receiver input for UART1.
SSEL0 — Slave Select for SSP0.
I/O
I/O
I/O
I
SSEL — Slave Select for SPI.
P0[17]/CTS1/
MISO0/MISO
P0[17] — General purpose digital input/output pin.
CTS1 — Clear to Send input for UART1.
MISO0 — Master In Slave Out for SSP0.
MISO — Master In Slave Out for SPI.
I/O
I/O
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P0[18]/DCD1/
MOSI0/MOSI
124[1]
K15[1]
I/O
I
P0[18] — General purpose digital input/output pin.
DCD1 — Data Carrier Detect input for UART1.
I/O
I/O
I/O
I
MOSI0 — Master Out Slave In for SSP0.
MOSI — Master Out Slave In for SPI.
P0[19]/DSR1/
MCICLK/SDA1
122[1]
120[1]
118[1]
116[1]
18[2]
L17[1]
M17[1]
M16[1]
N17[1]
H1[2]
P0[19] — General purpose digital input/output pin.
DSR1 — Data Set Ready input for UART1.
O
MCICLK — Clock output line for SD/MMC interface.
SDA1 — I2C1 data input/output (this is not an open-drain pin).
P0[20] — General purpose digital input/output pin.
DTR1 — Data Terminal Ready output for UART1.
MCICMD — Command line for SD/MMC interface.
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
P0[21] — General purpose digital input/output pin.
RI1 — Ring Indicator input for UART1.
I/O
I/O
O
P0[20]/DTR1/
MCICMD/SCL1
I/O
I/O
I/O
I
P0[21]/RI1/
MCIPWR/RD1
O
MCIPWR — Power Supply Enable for external SD/MMC power supply.
RD1 — CAN1 receiver input (LPC2460 only).
P0[22] — General purpose digital input/output pin.
RTS1 — Request to Send output for UART1.
MCIDAT0 — Data line 0 for SD/MMC interface.
TD1 — CAN1 transmitter output (LPC2460 only).
P0[23] — General purpose digital input/output pin.
AD0[0] — A/D converter 0, input 0.
I
P0[22]/RTS1/
MCIDAT0/TD1
I/O
O
I/O
O
P0[23]/AD0[0]/
I2SRX_CLK/
CAP3[0]
I/O
I
I/O
I2SRX_CLK — Receive Clock. It is driven by the master and received by
the slave. Corresponds to the signal SCK in the I2S-bus specification.
I
CAP3[0] — Capture input for Timer 3, channel 0.
P0[24] — General purpose digital input/output pin.
AD0[1] — A/D converter 0, input 1.
P0[24]/AD0[1]/
I2SRX_WS/
CAP3[1]
16[2]
G2[2]
I/O
I
I/O
I2SRX_WS — Receive Word Select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
specification.
I
CAP3[1] — Capture input for Timer 3, channel 1.
P0[25] — General purpose digital input/output pin.
AD0[2] — A/D converter 0, input 2.
P0[25]/AD0[2]/
I2SRX_SDA/
TXD3
14[2]
F1[2]
I/O
I
I/O
I2SRX_SDA — Receive data. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the I2S-bus specification.
O
I/O
I
TXD3 — Transmitter output for UART3.
P0[26] — General purpose digital input/output pin.
AD0[3] — A/D converter 0, input 3.
AOUT — D/A converter output.
P0[26]/AD0[3]/
AOUT/RXD3
O
I
RXD3 — Receiver input for UART3.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P0[27]/SDA0
50[4]
T1[4]
I/O
I/O
P0[27] — General purpose digital input/output pin.
SDA0 — I2C0 data input/output. Open-drain output (for I2C-bus
compliance).
P0[28]/SCL0
48[4]
R3[4]
I/O
I/O
P0[28] — General purpose digital input/output pin.
SCL0 — I2C0 clock input/output. Open-drain output (for I2C-bus
compliance).
P0[29]/USB_D+1
P0[30]/USB_D−1
P0[31]/USB_D+2
P1[0] to P1[31]
61[5]
62[5]
51[5]
U4[5]
R6[5]
T2[5]
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P0[29] — General purpose digital input/output pin.
USB_D+1 — USB port 1 bidirectional D+ line.
P0[30] — General purpose digital input/output pin.
USB_D−1 — USB port 1 bidirectional D− line.
P0[31] — General purpose digital input/output pin.
USB_D+2 — USB port 2 bidirectional D+ line.
Port 1: Port 1 is a 32 bit I/O port with individual direction controls for each
bit. The operation of port 1 pins depends upon the pin function selected
via the Pin Connect block.
P1[0]/
ENET_TXD0
196[1]
194[1]
185[1]
A3[1]
B5[1]
D9[1]
I/O
O
P1[0] — General purpose digital input/output pin.
ENET_TXD0 — Ethernet transmit data 0 (RMII/MII interface) (LPC2460
only).
P1[1]/
ENET_TXD1
I/O
O
P1[1] — General purpose digital input/output pin.
ENET_TXD1 — Ethernet transmit data 1 (RMII/MII interface) (LPC2460
only).
P1[2]/
I/O
O
P1[2] — General purpose digital input/output pin.
ENET_TXD2/
MCICLK/
PWM0[1]
ENET_TXD2 — Ethernet transmit data 2 (MII interface) (LPC2460 only).
MCICLK — Clock output line for SD/MMC interface.
PWM0[1] — Pulse Width Modulator 0, output 1.
O
O
P1[3]/
177[1]
A10[1]
I/O
O
P1[3] — General purpose digital input/output pin.
ENET_TXD3/
MCICMD/
PWM0[2]
ENET_TXD3 — Ethernet transmit data 3 (MII interface) (LPC2460 only).
MCICMD — Command line for SD/MMC interface.
PWM0[2] — Pulse Width Modulator 0, output 2.
I/O
O
P1[4]/
ENET_TX_EN
192[1]
156[1]
A5[1]
I/O
O
P1[4] — General purpose digital input/output pin.
ENET_TX_EN — Ethernet transmit data enable (RMII/MII interface)
(LPC2460 only).
P1[5]/
A17[1]
I/O
O
P1[5] — General purpose digital input/output pin.
ENET_TX_ER/
MCIPWR/
PWM0[3]
ENET_TX_ER — Ethernet Transmit Error (MII interface) (LPC2460 only).
MCIPWR — Power Supply Enable for external SD/MMC power supply.
PWM0[3] — Pulse Width Modulator 0, output 3.
O
O
P1[6]/
171[1]
B11[1]
I/O
I
P1[6] — General purpose digital input/output pin.
ENET_TX_CLK/
MCIDAT0/
PWM0[4]
ENET_TX_CLK — Ethernet Transmit Clock (MII interface) (LPC2460
only).
I/O
O
MCIDAT0 — Data line 0 for SD/MMC interface.
PWM0[4] — Pulse Width Modulator 0, output 4.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P1[7]/
153[1]
D14[1]
I/O
I
P1[7] — General purpose digital input/output pin.
ENET_COL/
MCIDAT1/
PWM0[5]
ENET_COL — Ethernet Collision detect (MII interface) (LPC2460 only).
MCIDAT1 — Data line 1 for SD/MMC interface.
I/O
O
PWM0[5] — Pulse Width Modulator 0, output 5.
P1[8]/
ENET_CRS_DV/
ENET_CRS
190[1]
188[1]
186[1]
163[1]
C7[1]
A6[1]
C8[1]
A14[1]
I/O
I
P1[8] — General purpose digital input/output pin.
ENET_CRS_DV/ENET_CRS — Ethernet Carrier Sense/Data Valid (RMII
interface)/ Ethernet Carrier Sense (MII interface) (LPC2460 only).
P1[9]/
ENET_RXD0
I/O
I
P1[9] — General purpose digital input/output pin.
ENET_RXD0 — Ethernet receive data 0 (RMII/MII interface) (LPC2460
only).
P1[10]/
ENET_RXD1
I/O
I
P1[10] — General purpose digital input/output pin.
ENET_RXD1 — Ethernet receive data 1 (RMII/MII interface) (LPC2460
only).
P1[11]/
I/O
I
P1[11] — General purpose digital input/output pin.
ENET_RXD2 — Ethernet Receive Data 2 (MII interface) (LPC2460 only).
MCIDAT2 — Data line 2 for SD/MMC interface.
ENET_RXD2/
MCIDAT2/
PWM0[6]
I/O
O
I/O
I
PWM0[6] — Pulse Width Modulator 0, output 6.
P1[12]/
157[1]
A16[1]
P1[12] — General purpose digital input/output pin.
ENET_RXD3 — Ethernet Receive Data (MII interface) (LPC2460 only).
MCIDAT3 — Data line 3 for SD/MMC interface.
ENET_RXD3/
MCIDAT3/
PCAP0[0]
I/O
I
PCAP0[0] — Capture input for PWM0, channel 0.
P1[13] — General purpose digital input/output pin.
P1[13]/
ENET_RX_DV
147[1]
184[1]
182[1]
D16[1]
A7[1]
A8[1]
I/O
I
ENET_RX_DV — Ethernet Receive Data Valid (MII interface) (LPC2460
only).
P1[14]/
ENET_RX_ER
I/O
I
P1[14] — General purpose digital input/output pin.
ENET_RX_ER — Ethernet receive error (RMII/MII interface) (LPC2460
only).
P1[15]/
ENET_REF_CLK/
ENET_RX_CLK
I/O
I
P1[15] — General purpose digital input/output pin.
ENET_REF_CLK/ENET_RX_CLK — Ethernet Reference Clock (RMII
interface)/ Ethernet Receive Clock (MII interface) (LPC2460 only).
P1[16]/
ENET_MDC
180[1]
178[1]
66[1]
D10[1]
A9[1]
P7[1]
I/O
O
P1[16] — General purpose digital input/output pin.
ENET_MDC — Ethernet MIIM clock (LPC2460 only).
P1[17] — General purpose digital input/output pin.
ENET_MDIO — Ethernet MIIM data input and output (LPC2460 only).
P1[18] — General purpose digital input/output pin.
P1[17]/
ENET_MDIO
I/O
I/O
I/O
O
P1[18]/
USB_UP_LED1/
PWM1[1]/
CAP1[0]
USB_UP_LED1 — USB port 1 GoodLink LED indicator. It is LOW when
device is configured (non-control endpoints enabled). It is HIGH when the
device is not configured or during global suspend.
O
I
PWM1[1] — Pulse Width Modulator 1, channel 1 output.
CAP1[0] — Capture input for Timer 1, channel 0.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P1[19]/
68[1]
U6[1]
I/O
O
P1[19] — General purpose digital input/output pin.
USB_TX_E1/
USB_PPWR1/
CAP1[1]
USB_TX_E1 — Transmit Enable signal for USB port 1 (OTG transceiver).
USB_PPWR1 — Port Power enable signal for USB port 1.
CAP1[1] — Capture input for Timer 1, channel 1.
O
I
P1[20]/
USB_TX_DP1/
PWM1[2]/SCK0
70[1]
72[1]
74[1]
76[1]
78[1]
80[1]
82[1]
88[1]
90[1]
U7[1]
R8[1]
U8[1]
P9[1]
I/O
O
P1[20] — General purpose digital input/output pin.
USB_TX_DP1 — D+ transmit data for USB port 1 (OTG transceiver).
PWM1[2] — Pulse Width Modulator 1, channel 2 output.
SCK0 — Serial clock for SSP0.
O
I/O
I/O
O
P1[21]/
USB_TX_DM1/
PWM1[3]/SSEL0
P1[21] — General purpose digital input/output pin.
USB_TX_DM1 — D− transmit data for USB port 1 (OTG transceiver).
PWM1[3] — Pulse Width Modulator 1, channel 3 output.
SSEL0 — Slave Select for SSP0.
O
I/O
I/O
I
P1[22]/
P1[22] — General purpose digital input/output pin.
USB_RCV1 — Differential receive data for USB port 1 (OTG transceiver).
USB_PWRD1 — Power Status for USB port 1 (host power switch).
MAT1[0] — Match output for Timer 1, channel 0.
USB_RCV1/
USB_PWRD1/
MAT1[0]
I
O
P1[23]/
USB_RX_DP1/
PWM1[4]/MISO0
I/O
I
P1[23] — General purpose digital input/output pin.
USB_RX_DP1 — D+ receive data for USB port 1 (OTG transceiver).
PWM1[4] — Pulse Width Modulator 1, channel 4 output.
MISO0 — Master In Slave Out for SSP0.
O
I/O
I/O
I
P1[24]/
USB_RX_DM1/
PWM1[5]/MOSI0
T9[1]
P1[24] — General purpose digital input/output pin.
USB_RX_DM1 — D− receive data for USB port 1 (OTG transceiver).
PWM1[5] — Pulse Width Modulator 1, channel 5 output.
MOSI0 — Master Out Slave in for SSP0.
O
I/O
I/O
O
P1[25]/
T10[1]
R10[1]
T12[1]
T13[1]
P1[25] — General purpose digital input/output pin.
USB_LS1 — Low-speed status for USB port 1 (OTG transceiver).
USB_HSTEN1 — Host Enabled status for USB port 1.
MAT1[1] — Match output for Timer 1, channel 1.
USB_LS1/
USB_HSTEN1/
MAT1[1]
O
O
P1[26]/
I/O
O
P1[26] — General purpose digital input/output pin.
USB_SSPND1 — USB port 1 Bus Suspend status (OTG transceiver).
PWM1[6] — Pulse Width Modulator 1, channel 6 output.
CAP0[0] — Capture input for Timer 0, channel 0.
USB_SSPND1/
PWM1[6]/
CAP0[0]
O
I
P1[27]/
I/O
I
P1[27] — General purpose digital input/output pin.
USB_INT1 — USB port 1 OTG transceiver interrupt (OTG transceiver).
USB_OVRCR1 — USB port 1 Over-Current status.
CAP0[1] — Capture input for Timer 0, channel 1.
USB_INT1/
USB_OVRCR1/
CAP0[1]
I
I
P1[28]/
I/O
I/O
I
P1[28] — General purpose digital input/output pin.
USB_SCL1 — USB port 1 I2C serial clock (OTG transceiver).
PCAP1[0] — Capture input for PWM1, channel 0.
USB_SCL1/
PCAP1[0]/
MAT0[0]
O
MAT0[0] — Match output for Timer 0, channel 0.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P1[29]/
92[1]
U14[1]
I/O
I/O
I
P1[29] — General purpose digital input/output pin.
USB_SDA1 — USB port 1 I2C serial data (OTG transceiver).
USB_SDA1/
PCAP1[1]/
MAT0[1]
PCAP1[1] — Capture input for PWM1, channel 1.
MAT0[1] — Match output for Timer 0, channel 0.
P1[30] — General purpose digital input/output pin.
USB_PWRD2 — Power Status for USB port 2.
VBUS — Monitors the presence of USB bus power.
Note: This signal must be HIGH for USB reset to occur.
AD0[4] — A/D converter 0, input 4.
O
I/O
I
P1[30]/
USB_PWRD2/
VBUS/AD0[4]
42[2]
P2[2]
I
I
P1[31]/
USB_OVRCR2/
SCK1/AD0[5]
40[2]
P1[2]
I/O
I
P1[31] — General purpose digital input/output pin.
USB_OVRCR2 — Over-Current status for USB port 2.
SCK1 — Serial Clock for SSP1.
I/O
I
AD0[5] — A/D converter 0, input 5.
P2[0] to P2[31]
I/O
Port 2: Port 2 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 2 pins depends upon the pin function selected
via the Pin Connect block.
P2[0]/PWM1[1]/
TXD1/
TRACECLK
154[1]
152[1]
150[1]
144[1]
142[1]
140[1]
B17[1]
E14[1]
D15[1]
E16[1]
D17[1]
F16[1]
I/O
O
O
O
I/O
O
I
P2[0] — General purpose digital input/output pin.
PWM1[1] — Pulse Width Modulator 1, channel 1 output.
TXD1 — Transmitter output for UART1.
TRACECLK — Trace Clock.
P2[1]/PWM1[2]/
RXD1/
PIPESTAT0
P2[1] — General purpose digital input/output pin.
PWM1[2] — Pulse Width Modulator 1, channel 2 output.
RXD1 — Receiver input for UART1.
O
I/O
O
I
PIPESTAT0 — Pipeline Status, bit 0.
P2[2]/PWM1[3]/
CTS1/
PIPESTAT1
P2[2] — General purpose digital input/output pin.
PWM1[3] — Pulse Width Modulator 1, channel 3 output.
CTS1 — Clear to Send input for UART1.
O
I/O
O
I
PIPESTAT1 — Pipeline Status, bit 1.
P2[3]/PWM1[4]/
DCD1/
PIPESTAT2
P2[3] — General purpose digital input/output pin.
PWM1[4] — Pulse Width Modulator 1, channel 4 output.
DCD1 — Data Carrier Detect input for UART1.
PIPESTAT2 — Pipeline Status, bit 2.
O
I/O
O
I
P2[4]/PWM1[5]/
DSR1/
TRACESYNC
P2[4] — General purpose digital input/output pin.
PWM1[5] — Pulse Width Modulator 1, channel 5 output.
DSR1 — Data Set Ready input for UART1.
TRACESYNC — Trace Synchronization.
O
I/O
O
O
O
P2[5]/PWM1[6]/
DTR1/
TRACEPKT0
P2[5] — General purpose digital input/output pin.
PWM1[6] — Pulse Width Modulator 1, channel 6 output.
DTR1 — Data Terminal Ready output for UART1.
TRACEPKT0 — Trace Packet, bit 0.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P2[6]/PCAP1[0]/
RI1/TRACEPKT1
138[1]
E17[1]
I/O
I
P2[6] — General purpose digital input/output pin.
PCAP1[0] — Capture input for PWM1, channel 0.
I
RI1 — Ring Indicator input for UART1.
O
I/O
I
TRACEPKT1 — Trace Packet, bit 1.
P2[7]/RD2/
RTS1/
TRACEPKT2
136[1]
134[1]
132[1]
G16[1]
H15[1]
H16[1]
P2[7] — General purpose digital input/output pin.
RD2 — CAN2 receiver input (LPC2460 only).
RTS1 — Request to Send output for UART1.
TRACEPKT2 — Trace Packet, bit 2.
O
O
I/O
O
O
O
I/O
O
P2[8]/TD2/
TXD2/
TRACEPKT3
P2[8] — General purpose digital input/output pin.
TD2 — CAN2 transmitter output (LPC2460 only).
TXD2 — Transmitter output for UART2.
TRACEPKT3 — Trace Packet, bit 3.
P2[9]/
USB_CONNECT1/
RXD2/
P2[9] — General purpose digital input/output pin.
USB_CONNECT1 — USB1 SoftConnect control. Signal used to switch
an external 1.5 kΩ resistor under the software control. Used with the
SoftConnect USB feature.
EXTIN0
I
RXD2 — Receiver input for UART2.
I
EXTIN0 — External Trigger Input.
P2[10]/EINT0
110[6]
N15[6]
I/O
P2[10] — General purpose digital input/output pin.
Note: LOW on this pin while RESET is LOW forces on-chip bootloader to
take over control of the part after a reset.
I
EINT0 — External interrupt 0 input.
P2[11]/EINT1/
MCIDAT1/
I2STX_CLK
108[6]
T17[6]
I/O
I
P2[11] — General purpose digital input/output pin.
EINT1 — External interrupt 1 input.
I/O
I/O
MCIDAT1 — Data line 1 for SD/MMC interface.
I2STX_CLK — Transmit Clock. It is driven by the master and received by
the slave. Corresponds to the signal SCK in the I2S-bus specification.
P2[12]/EINT2/
MCIDAT2/
I2STX_WS
106[6]
N14[6]
I/O
I
P2[12] — General purpose digital input/output pin.
EINT2 — External interrupt 2 input.
I/O
I/O
MCIDAT2 — Data line 2 for SD/MMC interface.
I2STX_WS — Transmit Word Select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
specification.
P2[13]/EINT3/
MCIDAT3/
I2STX_SDA
102[6]
T16[6]
I/O
I
P2[13] — General purpose digital input/output pin.
EINT3 — External interrupt 3 input.
I/O
I/O
MCIDAT3 — Data line 3 for SD/MMC interface.
I2STX_SDA — Transmit data. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the I2S-bus specification.
P2[14]/CS2/
CAP2[0]/SDA1
91[6]
R12[6]
I/O
O
P2[14] — General purpose digital input/output pin.
CS2 — LOW active Chip Select 2 signal.
I
CAP2[0] — Capture input for Timer 2, channel 0.
SDA1 — I2C1 data input/output (this is not an open-drain pin).
I/O
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P2[15]/CS3/
CAP2[1]/SCL1
99[6]
P13[6]
I/O
O
P2[15] — General purpose digital input/output pin.
CS3 — LOW active Chip Select 3 signal.
I
CAP2[1] — Capture input for Timer 2, channel 1.
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
P2[16] — General purpose digital input/output pin.
CAS — LOW active SDRAM Column Address Strobe.
P2[17] — General purpose digital input/output pin.
RAS — LOW active SDRAM Row Address Strobe.
P2[18] — General purpose digital input/output pin.
CLKOUT0 — SDRAM clock 0.
I/O
I/O
O
P2[16]/CAS
P2[17]/RAS
87[1]
95[1]
59[1]
67[1]
73[1]
81[1]
85[1]
R11[1]
R13[1]
U3[1]
I/O
O
P2[18]/
CLKOUT0
I/O
O
P2[19]/
CLKOUT1
R7[1]
I/O
O
P2[19] — General purpose digital input/output pin.
CLKOUT1 — SDRAM clock 1.
P2[20]/DYCS0
T8[1]
I/O
O
P2[20] — General purpose digital input/output pin.
DYCS0 — SDRAM chip select 0.
P2[21]/DYCS1
U11[1]
U12[1]
I/O
O
P2[21] — General purpose digital input/output pin.
DYCS1 — SDRAM chip select 1.
P2[22]/DYCS2/
CAP3[0]/SCK0
I/O
O
P2[22] — General purpose digital input/output pin.
DYCS2 — SDRAM chip select 2.
I
CAP3[0] — Capture input for Timer 3, channel 0.
SCK0 — Serial clock for SSP0.
I/O
I/O
O
P2[23]/DYCS3/
CAP3[1]/SSEL0
64[1]
U5[1]
P2[23] — General purpose digital input/output pin.
DYCS3 — SDRAM chip select 3.
I
CAP3[1] — Capture input for Timer 3, channel 1.
SSEL0 — Slave Select for SSP0.
I/O
I/O
O
P2[24]/
CKEOUT0
53[1]
54[1]
57[1]
P5[1]
R4[1]
T4[1]
P2[24] — General purpose digital input/output pin.
CKEOUT0 — SDRAM clock enable 0.
P2[25]/
CKEOUT1
I/O
O
P2[25] — General purpose digital input/output pin.
CKEOUT1 — SDRAM clock enable 1.
P2[26]/
I/O
O
P2[26] — General purpose digital input/output pin.
CKEOUT2 — SDRAM clock enable 2.
CKEOUT2/
MAT3[0]/MISO0
O
MAT3[0] — Match output for Timer 3, channel 0.
MISO0 — Master In Slave Out for SSP0.
I/O
I/O
O
P2[27]/
CKEOUT3/
MAT3[1]/MOSI0
47[1]
P3[1]
P2[27] — General purpose digital input/output pin.
CKEOUT3 — SDRAM clock enable 3.
O
MAT3[1] — Match output for Timer 3, channel 1.
MOSI0 — Master Out Slave In for SSP0.
I/O
I/O
O
P2[28]/
DQMOUT0
49[1]
43[1]
P4[1]
N3[1]
P2[28] — General purpose digital input/output pin.
DQMOUT0 — Data mask 0 used with SDRAM and static devices.
P2[29] — General purpose digital input/output pin.
DQMOUT1 — Data mask 1 used with SDRAM and static devices.
P2[29]/
DQMOUT1
I/O
O
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P2[30]/
DQMOUT2/
MAT3[2]/SDA2
31[1]
L4[1]
I/O
O
P2[30] — General purpose digital input/output pin.
DQMOUT2 — Data mask 2 used with SDRAM and static devices.
O
MAT3[2] — Match output for Timer 3, channel 2.
I/O
I/O
O
SDA2 — I2C2 data input/output (this is not an open-drain pin).
P2[31] — General purpose digital input/output pin.
P2[31]/
DQMOUT3/
MAT3[3]/SCL2
39[1]
N2[1]
DQMOUT3 — Data mask 3 used with SDRAM and static devices.
O
MAT3[3] — Match output for Timer 3, channel 3.
I/O
I/O
SCL2 — I2C2 clock input/output (this is not an open-drain pin).
P3[0] to P3[31]
Port 3: Port 3 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 3 pins depends upon the pin function selected
via the Pin Connect block.
P3[0]/D0
P3[1]/D1
P3[2]/D2
P3[3]/D3
P3[4]/D4
P3[5]/D5
P3[6]/D6
P3[7]/D7
P3[8]/D8
P3[9]/D9
P3[10]/D10
P3[11]/D11
P3[12]/D12
P3[13]/D13
P3[14]/D14
197[1]
201[1]
207[1]
3[1]
B4[1]
B3[1]
B1[1]
E4[1]
F2[1]
G1[1]
J1[1]
L1[1]
D8[1]
C5[1]
B2[1]
D5[1]
D4[1]
C1[1]
H2[1]
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P3[0] — General purpose digital input/output pin.
D0 — External memory data line 0.
P3[1] — General purpose digital input/output pin.
D1 — External memory data line 1.
P3[2] — General purpose digital input/output pin.
D2 — External memory data line 2.
P3[3] — General purpose digital input/output pin.
D3 — External memory data line 3.
13[1]
17[1]
23[1]
27[1]
191[1]
199[1]
205[1]
208[1]
1[1]
P3[4] — General purpose digital input/output pin.
D4 — External memory data line 4.
P3[5] — General purpose digital input/output pin.
D5 — External memory data line 5.
P3[6] — General purpose digital input/output pin.
D6 — External memory data line 6.
P3[7] — General purpose digital input/output pin.
D7 — External memory data line 7.
P3[8] — General purpose digital input/output pin.
D8 — External memory data line 8.
P3[9] — General purpose digital input/output pin.
D9 — External memory data line 9.
P3[10] — General purpose digital input/output pin.
D10 — External memory data line 10.
P3[11] — General purpose digital input/output pin.
D11 — External memory data line 11.
P3[12] — General purpose digital input/output pin.
D12 — External memory data line 12.
7[1]
P3[13] — General purpose digital input/output pin.
D13 — External memory data line 13.
21[1]
P3[14] — General purpose digital input/output pin.
D14 — External memory data line 14. On POR, this pin serves as the
BOOT0 pin.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P3[15]/D15
28[1]
M1[1]
I/O
I/O
P3[15] — General purpose digital input/output pin.
D15 — External memory data line 15. On POR, this pin serves as the
BOOT1 pin (flashless parts only).
BOOT[1:0] = 00 selects 8-bit external memory on CS1.
BOOT[1:0] = 01 is reserved. Do not use.
BOOT[1:0] = 10 selects 32-bit external memory on CS1.
BOOT[1:0] = 11 selects 16-bit external memory on CS1.
P3[16] — General purpose digital input/output pin.
D16 — External memory data line 16.
P3[16]/D16/
PWM0[1]/TXD1
137[1]
143[1]
151[1]
161[1]
167[1]
175[1]
195[1]
65[1]
F17[1]
F15[1]
C15[1]
B14[1]
A13[1]
C10[1]
C6[1]
I/O
I/O
O
PWM0[1] — Pulse Width Modulator 0, output 1.
TXD1 — Transmitter output for UART1.
O
P3[17]/D17/
PWM0[2]/RXD1
I/O
I/O
O
P3[17] — General purpose digital input/output pin.
D17 — External memory data line 17.
PWM0[2] — Pulse Width Modulator 0, output 2.
RXD1 — Receiver input for UART1.
I
P3[18]/D18/
PWM0[3]/CTS1
I/O
I/O
O
P3[18] — General purpose digital input/output pin.
D18 — External memory data line 18.
PWM0[3] — Pulse Width Modulator 0, output 3.
CTS1 — Clear to Send input for UART1.
I
P3[19]/D19/
PWM0[4]/DCD1
I/O
I/O
O
P3[19] — General purpose digital input/output pin.
D19 — External memory data line 19.
PWM0[4] — Pulse Width Modulator 0, output 4.
DCD1 — Data Carrier Detect input for UART1.
P3[20] — General purpose digital input/output pin.
D20 — External memory data line 20.
I
P3[20]/D20/
PWM0[5]/DSR1
I/O
I/O
O
PWM0[5] — Pulse Width Modulator 0, output 5.
DSR1 — Data Set Ready input for UART1.
P3[21] — General purpose digital input/output pin.
D21 — External memory data line 21.
I
P3[21]/D21/
PWM0[6]/DTR1
I/O
I/O
O
PWM0[6] — Pulse Width Modulator 0, output 6.
DTR1 — Data Terminal Ready output for UART1.
P3[22] — General purpose digital input/output pin.
D22 — External memory data line 22.
O
P3[22]/D22/
PCAP0[0]/RI1
I/O
I/O
I
PCAP0[0] — Capture input for PWM0, channel 0.
RI1 — Ring Indicator input for UART1.
I
P3[23]/D23/
CAP0[0]/
PCAP1[0]
T6[1]
I/O
I/O
I
P3[23] — General purpose digital input/output pin.
D23 — External memory data line 23.
CAP0[0] — Capture input for Timer 0, channel 0.
PCAP1[0] — Capture input for PWM1, channel 0.
I
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P3[24]/D24/
CAP0[1]/
PWM1[1]
58[1]
R5[1]
I/O
I/O
I
P3[24] — General purpose digital input/output pin.
D24 — External memory data line 24.
CAP0[1] — Capture input for Timer 0, channel 1.
PWM1[1] — Pulse Width Modulator 1, output 1.
P3[25] — General purpose digital input/output pin.
D25 — External memory data line 25.
O
P3[25]/D25/
MAT0[0]/
PWM1[2]
56[1]
55[1]
203[1]
5[1]
U2[1]
T3[1]
A1[1]
D2[1]
F3[1]
H3[1]
J3[1]
I/O
I/O
O
MAT0[0] — Match output for Timer 0, channel 0.
PWM1[2] — Pulse Width Modulator 1, output 2.
P3[26] — General purpose digital input/output pin.
D26 — External memory data line 26.
O
P3[26]/D26/
MAT0[1]/
PWM1[3]
I/O
I/O
O
MAT0[1] — Match output for Timer 0, channel 1.
PWM1[3] — Pulse Width Modulator 1, output 3.
P3[27] — General purpose digital input/output pin.
D27 — External memory data line 27.
O
P3[27]/D27/
CAP1[0]/
PWM1[4]
I/O
I/O
I
CAP1[0] — Capture input for Timer 1, channel 0.
PWM1[4] — Pulse Width Modulator 1, output 4.
P3[28] — General purpose digital input/output pin.
D28 — External memory data line 28.
O
P3[28]/D28/
CAP1[1]/
PWM1[5]
I/O
I/O
I
CAP1[1] — Capture input for Timer 1, channel 1.
PWM1[5] — Pulse Width Modulator 1, output 5.
P3[29] — General purpose digital input/output pin.
D29 — External memory data line 29.
O
P3[29]/D29/
MAT1[0]/
PWM1[6]
11[1]
19[1]
25[1]
I/O
I/O
O
MAT1[0] — Match output for Timer 1, channel 0.
PWM1[6] — Pulse Width Modulator 1, output 6.
P3[30] — General purpose digital input/output pin.
D30 — External memory data line 30.
O
P3[30]/D30/
MAT1[1]/
RTS1
I/O
I/O
O
MAT1[1] — Match output for Timer 1, channel 1.
RTS1 — Request to Send output for UART1.
P3[31] — General purpose digital input/output pin.
D31 — External memory data line 31.
O
P3[31]/D31/
MAT1[2]
I/O
I/O
O
MAT1[2] — Match output for Timer 1, channel 2.
P4[0] to P4[31]
I/O
Port 4: Port 4 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 4 pins depends upon the pin function selected
via the Pin Connect block.
P4[0]/A0
P4[1]/A1
P4[2]/A2
75[1]
79[1]
83[1]
U9[1]
I/O
I/O
I/O
I/O
I/O
I/O
P4[0] — ]General purpose digital input/output pin.
A0 — External memory address line 0.
U10[1]
T11[1]
P4[1] — General purpose digital input/output pin.
A1 — External memory address line 1.
P4[2] — General purpose digital input/output pin.
A2 — External memory address line 2.
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
97[1]
Ball
U16[1]
Type Description
P4[3] — General purpose digital input/output pin.
A3 — External memory address line 3.
P4[3]/A3
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P4[4]/A4
103[1]
107[1]
113[1]
121[1]
127[1]
131[1]
135[1]
145[1]
149[1]
155[1]
159[1]
173[1]
101[1]
104[1]
105[1]
111[1]
109[1]
R15[1]
R16[1]
M14[1]
L16[1]
J17[1]
H17[1]
G17[1]
F14[1]
C16[1]
B16[1]
B15[1]
A11[1]
U17[1]
P14[1]
P15[1]
P16[1]
R17[1]
P4[4] — General purpose digital input/output pin.
A4 — External memory address line 4.
P4[5]/A5
P4[5] — General purpose digital input/output pin.
A5 — External memory address line 5.
P4[6]/A6
P4[6] — General purpose digital input/output pin.
A6 — External memory address line 6.
P4[7]/A7
P4[7] — General purpose digital input/output pin.
A7 — External memory address line 7.
P4[8]/A8
P4[8] — General purpose digital input/output pin.
A8 — External memory address line 8.
P4[9]/A9
P4[9] — General purpose digital input/output pin.
A9 — External memory address line 9.
P4[10]/A10
P4[11]/A11
P4[12]/A12
P4[13]/A13
P4[14]/A14
P4[15]/A15
P4[16]/A16
P4[17]/A17
P4[18]/A18
P4[19]/A19
P4[10] — General purpose digital input/output pin.
A10 — External memory address line 10.
P4[11] — General purpose digital input/output pin.
A11 — External memory address line 11.
P4[12] — General purpose digital input/output pin.
A12 — External memory address line 12.
P4[13] — General purpose digital input/output pin.
A13 — External memory address line 13.
P4[14] — General purpose digital input/output pin.
A14 — External memory address line 14.
P4[15] — General purpose digital input/output pin.
A15 — External memory address line 15.
P4[16] — General purpose digital input/output pin.
A16 — External memory address line 16.
P4[17] — General purpose digital input/output pin.
A17 — External memory address line 17.
P4[18] — General purpose digital input/output pin.
A18 — External memory address line 18.
P4[19] — General purpose digital input/output pin.
A19 — External memory address line 19.
P4[20] — General purpose digital input/output pin.
A20 — External memory address line 20.
SDA2 — I2C2 data input/output (this is not an open-drain pin).
SCK1 — Serial Clock for SSP1.
P4[20]/A20/
SDA2/SCK1
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
P4[21]/A21/
SCL2/SSEL1
115[1]
M15[1]
I/O
I/O
I/O
I/O
I/O
I/O
O
P4[21] — General purpose digital input/output pin.
A21 — External memory address line 21.
SCL2 — I2C2 clock input/output (this is not an open-drain pin).
SSEL1 — Slave Select for SSP1.
P4[22]/A22/
TXD2/MISO1
123[1]
K14[1]
P4[22] — General purpose digital input/output pin.
A22 — External memory address line 22.
TXD2 — Transmitter output for UART2.
I/O
I/O
I/O
I
MISO1 — Master In Slave Out for SSP1.
P4[23]/A23/
RXD2/MOSI1
129[1]
J15[1]
P4[23] — General purpose digital input/output pin.
A23 — External memory address line 23.
RXD2 — Receiver input for UART2.
I/O
I/O
O
MOSI1 — Master Out Slave In for SSP1.
P4[24]/OE
183[1]
179[1]
119[1]
139[1]
170[1]
B8[1]
P4[24] — General purpose digital input/output pin.
OE — LOW active Output Enable signal.
P4[25]/WE
P4[26]/BLS0
P4[27]/BLS1
B9[1]
I/O
O
P4[25] — General purpose digital input/output pin.
WE — LOW active Write Enable signal.
L15[1]
G15[1]
C11[1]
I/O
O
P4[26] — General purpose digital input/output pin.
BLS0 — LOW active Byte Lane select signal 0.
P4[27] — General purpose digital input/output pin.
BLS1 — LOW active Byte Lane select signal 1.
P4 [28] — General purpose digital input/output pin.
BLS2 — LOW active Byte Lane select signal 2.
MAT2[0] — Match output for Timer 2, channel 0.
TXD3 — Transmitter output for UART3.
I/O
O
P4[28]/BLS2/
MAT2[0]/TXD3
I/O
O
O
O
P4[29]/BLS3/
MAT2[1]/RXD3
176[1]
B10[1]
I/O
O
P4[29] — General purpose digital input/output pin.
BLS3 — LOW active Byte Lane select signal 3.
MAT2[1] — Match output for Timer 2, channel 1.
RXD3 — Receiver input for UART3.
O
I
P4[30]/CS0
P4[31]/CS1
ALARM
187[1]
193[1]
37[8]
B7[1]
A4[1]
N1[8]
I/O
O
P4[30] — General purpose digital input/output pin.
CS0 — LOW active Chip Select 0 signal.
I/O
O
P4[31] — General purpose digital input/output pin.
CS1 — LOW active Chip Select 1 signal.
O
ALARM — RTC controlled output. This is a 1.8 V pin. It goes HIGH when
a RTC alarm is generated.
USB_D−2
52
U1
I/O
I
USB_D−2 — USB port 2 bidirectional D− line.
DBGEN
9[1]
F4[1]
DBGEN — JTAG interface control signal. Also used for boundary
scanning.
TDO
TDI
2[1]
4[1]
6[1]
8[1]
D3[1]
C2[1]
E3[1]
D1[1]
O
I
TDO — Test data out for JTAG interface.
TDI — Test data in for JTAG interface.
TMS — Test Mode Select for JTAG interface.
TRST — Test Reset for JTAG interface.
TMS
TRST
I
I
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Chapter 8: LPC24XX Pin configuration
Table 122. LPC2420/60/68 pin description …continued
Symbol
Pin
Ball
Type Description
TCK
10[1]
E2[1]
I
TCK — Test Clock for JTAG interface. This clock must be slower than 1⁄6
of the CPU clock (CCLK) for the JTAG interface to operate.
RTCK
206[1]
C3[1]
I/O
RTCK — JTAG interface control signal.
Note: LOW on this pin while RESET is LOW enables ETM pins (P2[9:0])
to operate as Trace port after reset.
RSTOUT
RESET
29
K3
O
I
RSTOUT — This is a 3.3 V pin. LOW on this pin indicates UM10237
being in Reset state.
35[7]
M2[7]
external reset input: A LOW on this pin resets the device, causing I/O
ports and peripherals to take on their default states, and processor
execution to begin at address 0. TTL with hysteresis, 5 V tolerant.
XTAL1
XTAL2
RTCX1
RTCX2
VSSIO
44[8]
46[8]
34[8]
36[8]
M4[8]
N4[8]
K2[8]
L2[8]
I
Input to the oscillator circuit and internal clock generator circuits.
Output from the oscillator amplifier.
O
I
Input to the RTC oscillator circuit.
O
I
Output from the RTC oscillator circuit.
33, 63, L3, T5,
77, 93, R9,
ground: 0 V reference for the digital I/O pins.
114,
133,
148,
169,
189,
200[8]
P12,
N16,
H14,
E15,
A12,
B6, A2[8]
VSSCORE
VSSA
32, 84, K4,P10, I
ground: 0 V reference for the core.
172[8]
22[8]
D12[8]
J2[8]
I
I
analog ground: 0 V reference. This should nominally be the same
voltage as VSSIO/VSSCORE, but should be isolated to minimize noise and
error.
VDD(3V3)
15, 60, G3,
3.3 V supply voltage: This is the power supply voltage for the I/O ports.
71, 89, P6, P8,
112,
125,
146,
165,
181,
198[8]
U13,
P17,
K16,
C17,
B13,
C9,
D7[8]
n.c.
30, 117, J4, L14,
I
not connected pins: These pins must be left unconnected (floating).
VDD(DCDC)(3V3)
VDDA
26, 86, H4, P11, I
3.3 V DC-to-DC converter supply voltage: This is the power supply for
the on-chip DC-to-DC converter.
174[8]
20[8]
D11[8]
G4[8]
I
I
I
analog 3.3 V pad supply voltage: This should be nominally the same
voltage as VDD(3V3) but should be isolated to minimize noise and error.
This voltage is used to power the ADC and DAC.
VREF
VBAT
24[8]
38[8]
K1[8]
M3[8]
ADC reference: This should be nominally the same voltage as VDD(3V3)
but should be isolated to minimize noise and error. The level on this pin is
used as a reference for ADC and DAC.
RTC power supply: 3.3 V on this pin supplies the power to the RTC.
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
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[2] 5 V tolerant pad providing digital I/O functions (with TTL levels and hysteresis) and analog input. When configured as a ADC input,
digital section of the pad is disabled.
[3] 5 V tolerant pad providing digital I/O with TTL levels and hysteresis and analog output function. When configured as the DAC output,
digital section of the pad is disabled.
[4] Open-drain 5 V tolerant digital I/O pad, compatible with I2C-bus 400 kHz specification. It requires an external pull-up to provide output
functionality. When power is switched off, this pin connected to the I2C-bus is floating and does not disturb the I2C lines. Open-drain
configuration applies to all functions on this pin.
[5] Pad provides digital I/O and USB functions. It is designed in accordance with the USB specification, revision 2.0 (Full-speed and
Low-speed mode only).
[6] 5 V tolerant pad with 5 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.
[7] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
[8] Pad provides special analog functionality.
5. LPC2470/78 pinning information
Table 123. LPC2470/78 pin allocation table
Pin Symbol
Row A
Pin Symbol
Pin Symbol
Pin Symbol
1
P3[27]/D27/
CAP1[0]/PWM1[4]
2
6
VSSIO
3
7
P1[0]/ENET_TXD0
P1[14]/ENET_RX_ER
4
8
P4[31]/CS1
5
P1[4]/ENET_TX_EN
P1[9]/ENET_RXD0
P1[15]/
ENET_REF_CLK/
ENET_RX_CLK
9
P1[17]/ENET_MDIO
10 P1[3]/ENET_TXD3/
MCICMD/PWM0[2]
11 P4[15]/A15
12 VSSIO
13 P3[20]/D20/
PWM0[5]/DSR1
14 P1[11]/ENET_RXD2/
MCIDAT2/PWM0[6]
15 P0[8]/I2STX_WS/
LCDVD[16]/MISO1/
MAT2[2]
16 P1[12]/ENET_RXD3/
MCIDAT3/PCAP0[0]
17 P1[5]/ENET_TX_ER/
MCIPWR/PWM0[3]
-
-
-
Row B
1
5
9
P3[2]/D2
2
6
P3[10]/D10
VSSIO
3
7
P3[1]/D1
4
8
P3[0]/D0
P1[1]/ENET_TXD1
P4[25]/WE
P4[30]/CS0
P4[24]/OE
10 P4[29]/BLS3/MAT2[1]/
LCDVD[7]/LCDVD[11]/
LCDVD[3]/RXD3
11 P1[6]/ENET_TX_CLK/
MCIDAT0/PWM0[4]
12 P0[4]/I2SRX_CLK/
LCDVD[0]/RD2/CAP2[0]
13 VDD(3V3)
14 P3[19]/D19/
PWM0[4]/DCD1
15 P4[14]/A14
-
16 P4[13]/A13
-
17 P2[0]/PWM1[1]/TXD1/
TRACECLK/LCDPWR
-
Row C
1
5
P3[13]/D13
P3[9]/D9
2
6
TDI
3
7
RTCK
4
8
P0[2]/TXD0
P3[22]/D22/
PCAP0[0]/RI1
P1[8]/ENET_CRS_DV/
ENET_CRS
P1[10]/ENET_RXD1
9
VDD(3V3)
10 P3[21]/D21/
PWM0[6]/DTR1
11 P4[28]/BLS2/MAT2[0]/
LCDVD[6]/LCDVD[10]/
LCDVD[2]/TXD3
12 P0[5]/I2SRX_WS/
LCDVD[1]/TD2/CAP2[1]
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Chapter 8: LPC24XX Pin configuration
Table 123. LPC2470/78 pin allocation table …continued
Pin Symbol
Pin Symbol
Pin Symbol
Pin Symbol
13 P0[7]/I2STX_CLK/
LCDVD[9]/SCK1/
MAT2[1]
14 P0[9]/I2STX_SDA/
LCDVD[17]/MOSI1/
MAT2[3]
15 P3[18]/D18/
PWM0[3]/CTS1
16 P4[12]/A12
17 VDD(3V3)
-
-
-
Row D
1
TRST
2
6
P3[28]/D28/
CAP1[1]/PWM1[5]
3
7
TDO
4
8
P3[12]/D12
P3[8]/D8
5
9
P3[11]/D11
P0[3]/RXD0
VDD(3V3)
P1[2]/ENET_TXD2/
MCICLK/PWM0[1]
10 P1[16]/ENET_MDC
11 VDD(DCDC)(3V3)
12 VSSCORE
13 P0[6]/I2SRX_SDA/
LCDVD[8]/SSEL1/
MAT2[0]
14 P1[7]/ENET_COL/
MCIDAT1/PWM0[5]
15 P2[2]/PWM1[3]/CTS1/
PIPESTAT1/LCDDCLK
16 P1[13]/ENET_RX_DV
17 P2[4]/PWM1[5]/
DSR1/TRACESYNC/
LCDENAB/LCDM
-
-
-
Row E
1
P0[26]/AD0[3]/
AOUT/RXD3
2
TCK
3
TMS
4
P3[3]/D3
14 P2[1]/PWM1[2]/RXD1/
PIPESTAT0/LCDLE
15 VSSIO
16 P2[3]/PWM1[4]/DCD1/ 17 P2[6]/PCAP1[0]/RI1/
PIPESTAT2/LCDFP
TRACEPKT1/
LCDVD[0]/LCDVD[4]
Row F
1
P0[25]/AD0[2]/
2
P3[4]/D4
3
P3[29]/D29/
4
DBGEN
I2SRX_SDA/TXD3
MAT1[0]/PWM1[6]
14 P4[11]/A11
15 P3[17]/D17/
16 P2[5]/PWM1[6]/
DTR1/TRACEPKT0/
LCDLP
17 P3[16]/D16/
PWM0[1]/TXD1
PWM0[2]/RXD1
Row G
1
P3[5]/D5
2
P0[24]/AD0[1]/
I2SRX_WS/CAP3[1]
3
VDD(3V3)
4
VDDA
14 NC
15 P4[27]/BLS1
16 P2[7]/RD2/
RTS1/TRACEPKT2/
17 P4[10]/A10
LCDVD[1]/LCDVD[5]
Row H
1
P0[23]/AD0[0]/
I2SRX_CLK/CAP3[0]
2
P3[14]/D14
3
P3[30]/D30/
MAT1[1]/RTS1
4
VDD(DCDC)(3V3)
14 VSSIO
15 P2[8]/TD2/TXD2/
TRACEPKT3/
16 P2[9]/
USB_CONNECT1/
17 P4[9]/A9
LCDVD[2]/LCDVD[6]
RXD2/EXTIN0/
LCDVD[3]/LCDVD[7]
Row J
1
P3[6]/D6
2
VSSA
3
P3[31]/D31/MAT1[2]
4
NC
14 P0[16]/RXD1/
SSEL0/SSEL
15 P4[23]/A23/
RXD2/MOSI1
16 P0[15]/TXD1/
SCK0/SCK
17 P4[8]/A8
Row K
1
VREF
2
RTCX1
3
RSTOUT
4
VSSCORE
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Table 123. LPC2470/78 pin allocation table …continued
Pin Symbol
Pin Symbol
Pin Symbol
Pin Symbol
14 P4[22]/A22/
TXD2/MISO1
15 P0[18]/DCD1/
MOSI0/MOSI
16 VDD(3V3)
17 P0[17]/CTS1/
MISO0/MISO
Row L
1
P3[7]/D7
2
RTCX2
3
VSSIO
4
P2[30]/DQMOUT2/
MAT3[2]/SDA2
14 NC
15 P4[26]/BLS0
16 P4[7]/A7
17 P0[19]/DSR1/
MCICLK/SDA1
Row M
1
P3[15]/D15
2
RESET
3
VBAT
4
XTAL1
14 P4[6]/A6
15 P4[21]/A21/
SCL2/SSEL1
16 P0[21]/RI1/
MCIPWR/RD1
17 P0[20]/DTR1/
MCICMD/SCL1
Row N
1
ALARM
2
P2[31]/DQMOUT3/
MAT3[3]/SCL2
3
P2[29]/DQMOUT1
4
XTAL2
14 P2[12]/EINT2/
LCDVD[4]/LCDVD[8]/
15 P2[10]/EINT0
16 VSSIO
17 P0[22]/RTS1/
MCIDAT0/TD1
LCDVD[3]/LCDVD[18]/
MCIDAT2/I2STX_WS
Row P
1
5
9
P1[31]/USB_OVRCR2/
SCK1/AD0[5]
2
6
P1[30]/USB_PWRD2/
VBUS/AD0[4]
3
7
P2[27]/CKEOUT3/
MAT3[1]/MOSI0
4
8
P2[28]/DQMOUT0
VDD(3V3)
P2[24]/CKEOUT0
VDD(3V3)
P1[18]/USB_UP_LED1/
PWM1[1]/CAP1[0]
P1[23]/USB_RX_DP1/
LCDVD[9]/LCDVD[13]/
PWM1[4]/MISO0
10 VSSCORE
11 VDD(DCDC)(3V3)
12 VSSIO
13 P2[15]/CS3/
CAP2[1]/SCL1
14 P4[17]/A17
-
15 P4[18]/A18
-
16 P4[19]/A19
-
17 VDD(3V3)
Row R
1
P0[12]/USB_PPWR2/
MISO1/AD0[6]
2
6
P0[13]/USB_UP_LED2/
MOSI1/AD0[7]
3
7
P0[28]/SCL0
4
8
P2[25]/CKEOUT1
5
P3[24]/D24/
CAP0[1]/PWM1[1]
P0[30]/USB_D−1
P2[19]/CLKOUT1
P1[21]/USB_TX_DM1/
LCDVD[7]/LCDVD[11]/
PWM1[3]/SSEL0
9
VSSIO
10 P1[26]/USB_SSPND1/ 11 P2[16]/CAS
LCDVD[12]/LCDVD[20]/
12 P2[14]/CS2/CAP2[0]/
SDA1
PWM1[6]/CAP0[0]
13 P2[17]/RAS
14 P0[11]/RXD2/SCL2/
MAT3[1]
15 P4[4]/A4
-
16 P4[5]/A5
-
17 P4[20]/A20/SDA2/SCK1
-
Row T
1
P0[27]/SDA0
2
6
P0[31]/USB_D+2
3
7
P3[26]/D26/
MAT0[1]/PWM1[3]
4
8
P2[26]/CKEOUT2/
MAT3[0]/MISO0
5
VSSIO
P3[23]/D23/
CAP0[0]/PCAP1[0]
P0[14]/USB_HSTEN2/
USB_CONNECT2/
SSEL1
P2[20]/DYCS0
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Table 123. LPC2470/78 pin allocation table …continued
Pin Symbol
Pin Symbol
Pin Symbol
Pin Symbol
9
P1[24]/USB_RX_DM1/ 10 P1[25]/USB_LS1/
11 P4[2]/A2
12 P1[27]/USB_INT1/
LCDVD[13]/LCDVD[21]/
USB_OVRCR1/CAP0[1]
LCDVD[10]/LCDVD[14]/
PWM1[5]/MOSI0
LCDVD[11]/LCDVD[15]/
USB_HSTEN1/MAT1[1]
13 P1[28]/USB_SCL1/
LCDVD[14]/LCDVD[22]/
PCAP1[0]/MAT0[0]
14 P0[1]/TD1/RXD3/SCL1 15 P0[10]/TXD2/SDA2/
MAT3[0]
16 P2[13]/EINT3/
LCDVD[5]/LCDVD[9]/
LCDVD[19]/MCIDAT3/
I2STX_SDA
17 P2[11]/EINT1/
LCDCLKIN/
-
-
-
MCIDAT1/I2STX_CLK
Row U
1
USB_D−2
2
6
P3[25]/D25/
MAT0[0]/PWM1[2]
3
7
P2[18]/CLKOUT0
4
8
P0[29]/USB_D+1
5
P2[23]/DYCS3/
CAP3[1]/SSEL0
P1[19]/USB_TX_E1/
USB_PPWR1/CAP1[1]
P1[20]/USB_TX_DP1/
LCDVD[6]/LCDVD[10]/
PWM1[2]/SCK0
P1[22]/USB_RCV1/
LCDVD[8]/LCDVD[12]/
USB_PWRD1/MAT1[0]
9
P4[0]/A0
10 P4[1]/A1
11 P2[21]/DYCS1
12 P2[22]/DYCS2/
CAP3[0]/SCK0
13 VDD(3V3)
14 P1[29]/USB_SDA1/
LCDVD[15]/LCDVD[23]/
PCAP1[1]/MAT0[1]
15 P0[0]/RD1/TXD3/SDA1 16 P4[3]/A3
17 P4[16]/A16
-
-
-
Table 124. LPC2470/78 pin description
Symbol
Pin
Ball
Type Description
P0[0] to P0[31]
I/O
Port 0: Port 0 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 0 pins depends upon the pin function selected
via the pin connect block.
P0[0]/RD1/TXD3/
SDA1
94[1]
U15[1]
I/O
I
P0[0] — General purpose digital input/output pin.
RD1 — CAN1 receiver input.
O
TXD3 — Transmitter output for UART3.
I/O
I/O
O
SDA1 — I2C1 data input/output (this is not an open-drain pin).
P0[1] — General purpose digital input/output pin.
TD1 — CAN1 transmitter output.
P0[1]/TD1/RXD3/
SCL1
96[1]
T14[1]
I
RXD3 — Receiver input for UART3.
I/O
I/O
O
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
P0[2] — General purpose digital input/output pin.
TXD0 — Transmitter output for UART0.
P0[2]/TXD0
P0[3]/RXD0
202[1]
204[1]
C4[1]
D6[1]
I/O
I
P0[3] — General purpose digital input/output pin.
RXD0 — Receiver input for UART0.
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P0[4]/I2SRX_CLK/ 168[1]
LCDVD[0]/RD2/
CAP2[0]
B12[1]
I/O
I/O
P0[4] — General purpose digital input/output pin.
I2SRX_CLK — I2S Receive clock. It is driven by the master and received
by the slave. Corresponds to the signal SCK in the I2S-bus
O
I
RD2 — CAN2 receiver input.
I
CAP2[0] — Capture input for Timer 2, channel 0.
P0[5] — General purpose digital input/output pin.
I2SRX_WS — I2S Receive word select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
P0[5]/I2SRX_WS/
LCDVD[1]/TD2/
CAP2[1]
166[1]
C12[1]
D13[1]
C13[1]
A15[1]
C14[1]
I/O
I/O
O
O
TD2 — CAN2 transmitter output.
I
CAP2[1] — Capture input for Timer 2, channel 1.
P0[6] — General purpose digital input/output pin.
I2SRX_SDA — I2S Receive data. It is driven by the transmitter and read
by the receiver. Corresponds to the signal SD in the I2S-bus
P0[6]/I2SRX_SDA/ 164[1]
LCDVD[8]/
SSEL1/MAT2[0]
I/O
I/O
O
I/O
O
SSEL1 — Slave Select for SSP1.
MAT2[0] — Match output for Timer 2, channel 0.
P0[7] — General purpose digital input/output pin.
I2STX_CLK — I2S transmit clock. It is driven by the master and received
by the slave. Corresponds to the signal SCK in the I2S-bus
P0[7]/I2STX_CLK/ 162[1]
LCDVD[9]/SCK1/
MAT2[1]
I/O
I/O
O
I/O
O
SCK1 — Serial Clock for SSP1.
MAT2[1] — Match output for Timer 2, channel 1.
P0[8] — General purpose digital input/output pin.
I2STX_WS — I2S Transmit word select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
P0[8]/I2STX_WS/
LCDVD[16]/
MISO1/MAT2[2]
160[1]
I/O
I/O
O
I/O
O
MISO1 — Master In Slave Out for SSP1.
MAT2[2] — Match output for Timer 2, channel 2.
P0[9] — General purpose digital input/output pin.
I2STX_SDA — I2S transmit data. It is driven by the transmitter and read
by the receiver. Corresponds to the signal SD in the I2S-bus
P0[9]/I2STX_SDA/ 158[1]
LCDVD[17]/
I/O
I/O
MOSI1/MAT2[3]
O
I/O
O
MOSI1 — Master Out Slave In for SSP1.
MAT2[3] — Match output for Timer 2, channel 3.
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P0[10]/TXD2/
SDA2/MAT3[0]
98[1]
T15[1]
I/O
O
P0[10] — General purpose digital input/output pin.
TXD2 — Transmitter output for UART2.
I/O
O
SDA2 — I2C2 data input/output (this is not an open-drain pin).
MAT3[0] — Match output for Timer 3, channel 0.
P0[11] — General purpose digital input/output pin.
RXD2 — Receiver input for UART2.
P0[11]/RXD2/
SCL2/MAT3[1]
100[1]
41[2]
45[2]
R14[1]
R1[2]
R2[2]
I/O
I
I/O
O
SCL2 — I2C2 clock input/output (this is not an open-drain pin).
MAT3[1] — Match output for Timer 3, channel 1.
P0[12] — General purpose digital input/output pin.
USB_PPWR2 — Port Power enable signal for USB port 2.
MISO1 — Master In Slave Out for SSP1.
P0[12]/
USB_PPWR2/
MISO1/AD0[6]
I/O
O
I/O
I
AD0[6] — A/D converter 0, input 6.
P0[13]/
I/O
O
P0[13] — General purpose digital input/output pin.
USB_UP_LED2/
MOSI1/AD0[7]
USB_UP_LED2 — USB port 2 GoodLink LED indicator. It is LOW when
device is configured (non-control endpoints enabled). It is HIGH when the
device is not configured or during global suspend.
I/O
I
MOSI1 — Master Out Slave In for SSP1.
AD0[7] — A/D converter 0, input 7.
P0[14]/
69[1]
T7[1]
I/O
O
P0[14] — General purpose digital input/output pin.
USB_HSTEN2 — Host Enabled status for USB port 2.
USB_HSTEN2/
USB_CONNECT2/
SSEL1
O
USB_CONNECT2 — SoftConnect control for USB port 2. Signal used to
switch an external 1.5 kΩ resistor under software control. Used with the
SoftConnect USB feature.
I/O
I/O
O
SSEL1 — Slave Select for SSP1.
P0[15]/TXD1/
SCK0/SCK
128[1]
130[1]
126[1]
124[1]
J16[1]
J14[1]
K17[1]
K15[1]
P0[15] — General purpose digital input/output pin.
TXD1 — Transmitter output for UART1.
SCK0 — Serial clock for SSP0.
I/O
I/O
I/O
I
SCK — Serial clock for SPI.
P0[16]/RXD1/
SSEL0/SSEL
P0 [16] — General purpose digital input/output pin.
RXD1 — Receiver input for UART1.
I/O
I/O
I/O
I
SSEL0 — Slave Select for SSP0.
SSEL — Slave Select for SPI.
P0[17]/CTS1/
MISO0/MISO
P0[17] — General purpose digital input/output pin.
CTS1 — Clear to Send input for UART1.
MISO0 — Master In Slave Out for SSP0.
MISO — Master In Slave Out for SPI.
P0[18] — General purpose digital input/output pin.
DCD1 — Data Carrier Detect input for UART1.
MOSI0 — Master Out Slave In for SSP0.
MOSI — Master Out Slave In for SPI.
I/O
I/O
I/O
I
P0[18]/DCD1/
MOSI0/MOSI
I/O
I/O
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P0[19]/DSR1/
MCICLK/SDA1
122[1]
L17[1]
I/O
I
P0[19] — General purpose digital input/output pin.
DSR1 — Data Set Ready input for UART1.
O
MCICLK — Clock output line for SD/MMC interface.
SDA1 — I2C1 data input/output (this is not an open-drain pin).
P0[20] — General purpose digital input/output pin.
DTR1 — Data Terminal Ready output for UART1.
MCICMD — Command line for SD/MMC interface.
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
P0[21] — General purpose digital input/output pin.
RI1 — Ring Indicator input for UART1.
I/O
I/O
O
P0[20]/DTR1/
MCICMD/SCL1
120[1]
118[1]
116[1]
18[2]
M17[1]
M16[1]
N17[1]
H1[2]
I/O
I/O
I/O
I
P0[21]/RI1/
MCIPWR/RD1
O
MCIPWR — Power Supply Enable for external SD/MMC power supply.
RD1 — CAN1 receiver input.
I
P0[22]/RTS1/
MCIDAT0/TD1
I/O
O
P0[22] — General purpose digital input/output pin.
RTS1 — Request to Send output for UART1.
MCIDAT0 — Data line 0 for SD/MMC interface.
TD1 — CAN1 transmitter output.
I/O
O
P0[23]/AD0[0]/
I2SRX_CLK/
CAP3[0]
I/O
I
P0[23] — General purpose digital input/output pin.
AD0[0] — A/D converter 0, input 0.
I/O
I2SRX_CLK — Receive Clock. It is driven by the master and received by
the slave. Corresponds to the signal SCK in the I2S-bus specification.
I
CAP3[0] — Capture input for Timer 3, channel 0.
P0[24] — General purpose digital input/output pin.
AD0[1] — A/D converter 0, input 1.
P0[24]/AD0[1]/
I2SRX_WS/
CAP3[1]
16[2]
G2[2]
I/O
I
I/O
I2SRX_WS — Receive Word Select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
specification.
I
CAP3[1] — Capture input for Timer 3, channel 1.
P0[25] — General purpose digital input/output pin.
AD0[2] — A/D converter 0, input 2.
P0[25]/AD0[2]/
I2SRX_SDA/
TXD3
14[2]
F1[2]
I/O
I
I/O
I2SRX_SDA — Receive data. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the I2S-bus specification.
O
TXD3 — Transmitter output for UART3.
P0[26] — General purpose digital input/output pin.
AD0[3] — A/D converter 0, input 3.
P0[26]/AD0[3]/
AOUT/RXD3
I/O
I
O
AOUT — D/A converter output.
I
RXD3 — Receiver input for UART3.
P0[27]/SDA0
P0[28]/SCL0
50[4]
48[4]
T1[4]
R3[4]
I/O
I/O
P0[27] — General purpose digital input/output pin.
SDA0 — I2C0 data input/output. Open-drain output (for I2C-bus
compliance).
I/O
I/O
P0[28] — General purpose digital input/output pin.
SCL0 — I2C0 clock input/output. Open-drain output (for I2C-bus
compliance).
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P0[29]/USB_D+1
61[5]
U4[5]
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P0[29] — General purpose digital input/output pin.
USB_D+1 — USB port 1 bidirectional D+ line.
P0[30]/USB_D−1
P0[31]/USB_D+2
P1[0] to P1[31]
62[5]
51[5]
R6[5]
T2[5]
P0[30] — General purpose digital input/output pin.
USB_D−1 — USB port 1 bidirectional D− line.
P0[31] — General purpose digital input/output pin.
USB_D+2 — USB port 2 bidirectional D+ line.
Port 1: Port 1 is a 32 bit I/O port with individual direction controls for each
bit. The operation of port 1 pins depends upon the pin function selected
via the pin connect block.
P1[0]/
ENET_TXD0
196[1]
194[1]
185[1]
A3[1]
B5[1]
D9[1]
I/O
O
P1[0] — General purpose digital input/output pin.
ENET_TXD0 — Ethernet transmit data 0 (RMII/MII interface).
P1[1] — General purpose digital input/output pin.
ENET_TXD1 — Ethernet transmit data 1 (RMII/MII interface).
P1[2] — General purpose digital input/output pin.
ENET_TXD2 — Ethernet transmit data 2 (MII interface).
MCICLK — Clock output line for SD/MMC interface.
PWM0[1] — Pulse Width Modulator 0, output 1.
P1[1]/
ENET_TXD1
I/O
O
P1[2]/
I/O
O
ENET_TXD2/
MCICLK/
PWM0[1]
O
O
P1[3]/
177[1]
A10[1]
I/O
O
P1[3] — General purpose digital input/output pin.
ENET_TXD3 — Ethernet transmit data 3 (MII interface).
MCICMD — Command line for SD/MMC interface.
PWM0[2] — Pulse Width Modulator 0, output 2.
ENET_TXD3/
MCICMD/
PWM0[2]
I/O
O
P1[4]/
ENET_TX_EN
192[1]
156[1]
A5[1]
I/O
O
P1[4] — General purpose digital input/output pin.
ENET_TX_EN — Ethernet transmit data enable (RMII/MII interface).
P1[5] — General purpose digital input/output pin.
ENET_TX_ER — Ethernet Transmit Error (MII interface).
MCIPWR — Power Supply Enable for external SD/MMC power supply.
PWM0[3] — Pulse Width Modulator 0, output 3.
P1[5]/
A17[1]
I/O
O
ENET_TX_ER/
MCIPWR/
PWM0[3]
O
O
P1[6]/
171[1]
153[1]
190[1]
B11[1]
D14[1]
C7[1]
I/O
I
P1[6] — General purpose digital input/output pin.
ENET_TX_CLK — Ethernet Transmit Clock (MII interface).
MCIDAT0 — Data line 0 for SD/MMC interface.
ENET_TX_CLK/
MCIDAT0/
PWM0[4]
I/O
O
PWM0[4] — Pulse Width Modulator 0, output 4.
P1[7]/
I/O
I
P1[7] — General purpose digital input/output pin.
ENET_COL — Ethernet Collision detect (MII interface).
MCIDAT1 — Data line 1 for SD/MMC interface.
ENET_COL/
MCIDAT1/
PWM0[5]
I/O
O
PWM0[5] — Pulse Width Modulator 0, output 5.
P1[8]/
ENET_CRS_DV/
ENET_CRS
I/O
I
P1[8] — General purpose digital input/output pin.
ENET_CRS_DV/ENET_CRS — Ethernet Carrier Sense/Data Valid (RMII
interface)/ Ethernet Carrier Sense (MII interface).
P1[9]/
ENET_RXD0
188[1]
186[1]
A6[1]
C8[1]
I/O
P1[9] — General purpose digital input/output pin.
ENET_RXD0 — Ethernet receive data 0 (RMII/MII interface).
P1[10] — General purpose digital input/output pin.
ENET_RXD1 — Ethernet receive data 1 (RMII/MII interface).
© NXP B.V. 2008. All rights reserved.
I
P1[10]/
ENET_RXD1
I/O
I
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P1[11]/
163[1]
A14[1]
I/O
I
P1[11] — General purpose digital input/output pin.
ENET_RXD2 — Ethernet Receive Data 2 (MII interface).
ENET_RXD2/
MCIDAT2/
PWM0[6]
I/O
O
I/O
I
MCIDAT2 — Data line 2 for SD/MMC interface.
PWM0[6] — Pulse Width Modulator 0, output 6.
P1[12] — General purpose digital input/output pin.
ENET_RXD3 — Ethernet Receive Data (MII interface).
MCIDAT3 — Data line 3 for SD/MMC interface.
PCAP0[0] — Capture input for PWM0, channel 0.
P1[13] — General purpose digital input/output pin.
ENET_RX_DV — Ethernet Receive Data Valid (MII interface).
P1[14] — General purpose digital input/output pin.
ENET_RX_ER — Ethernet receive error (RMII/MII interface).
P1[15] — General purpose digital input/output pin.
P1[12]/
157[1]
A16[1]
ENET_RXD3/
MCIDAT3/
PCAP0[0]
I/O
I
P1[13]/
ENET_RX_DV
147[1]
184[1]
182[1]
D16[1]
A7[1]
A8[1]
I/O
I
P1[14]/
ENET_RX_ER
I/O
I
P1[15]/
ENET_REF_CLK/
ENET_RX_CLK
I/O
I
ENET_REF_CLK/ENET_RX_CLK — Ethernet Reference Clock (RMII
interface)/ Ethernet Receive Clock (MII interface).
P1[16]/
ENET_MDC
180[1]
178[1]
66[1]
D10[1]
A9[1]
P7[1]
I/O
O
P1[16] — General purpose digital input/output pin.
ENET_MDC — Ethernet MIIM clock.
P1[17]/
ENET_MDIO
I/O
I/O
I/O
O
P1[17] — General purpose digital input/output pin.
ENET_MDIO — Ethernet MIIM data input and output.
P1[18] — General purpose digital input/output pin.
P1[18]/
USB_UP_LED1/
PWM1[1]/CAP1[0]
USB_UP_LED1 — USB port 1 GoodLink LED indicator. It is LOW when
device is configured (non-control endpoints enabled). It is HIGH when the
device is not configured or during global suspend.
O
I
PWM1[1] — Pulse Width Modulator 1, channel 1 output.
CAP1[0] — Capture input for Timer 1, channel 0.
P1[19] — General purpose digital input/output pin.
P1[19]/
68[1]
U6[1]
I/O
O
USB_TX_E1/
USB_PPWR1/
CAP1[1]
USB_TX_E1 — Transmit Enable signal for USB port 1 (OTG
transceiver).
O
USB_PPWR1 — Port Power enable signal for USB port 1.
CAP1[1] — Capture input for Timer 1, channel 1.
P1[20] — General purpose digital input/output pin.
I
P1[20]/
USB_TX_DP1/
LCDVD[6]/
LCDVD[10]/
PWM1[2]/SCK0
70[1]
U7[1]
I/O
O
O
O
PWM1[2] — Pulse Width Modulator 1, channel 2 output.
SCK0 — Serial clock for SSP0.
I/O
I/O
O
P1[21]/
USB_TX_DM1/
LCDVD[7]/
LCDVD[11]/
PWM1[3]/SSEL0
72[1]
R8[1]
P1[21] — General purpose digital input/output pin.
O
O
PWM1[3] — Pulse Width Modulator 1, channel 3 output.
SSEL0 — Slave Select for SSP0.
I/O
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P1[22]/USB_RCV1/ 74[1]
LCDVD[8]/
LCDVD[12]/
USB_PWRD1/
MAT1[0]
U8[1]
I/O
I
P1[22] — General purpose digital input/output pin.
USB_RCV1 — Differential receive data for USB port 1 (OTG
transceiver).[16]
O
I
USB_PWRD1 — Power Status for USB port 1 (host power switch).
MAT1[0] — Match output for Timer 1, channel 0.
P1[23] — General purpose digital input/output pin.
O
I/O
I
P1[23]/
USB_RX_DP1/
LCDVD[9]/
LCDVD[13]/
PWM1[4]/MISO0
76[1]
78[1]
80[1]
82[1]
P9[1]
O
O
I/O
I/O
I
PWM1[4] — Pulse Width Modulator 1, channel 4 output.
MISO0 — Master In Slave Out for SSP0.
P1[24]/
T9[1]
P1[24] — General purpose digital input/output pin.
USB_RX_DM1/
LCDVD[10]/
LCDVD[14]/
PWM1[5]/MOSI0
O
O
I/O
I/O
O
O
O
O
I/O
O
O
O
I
PWM1[5] — Pulse Width Modulator 1, channel 5 output.
MOSI0 — Master Out Slave in for SSP0.
P1[25]/USB_LS1/
LCDVD[11]/
LCDVD[15]/
USB_HSTEN1/
MAT1[1]
T10[1]
R10[1]
T12[1]
P1[25] — General purpose digital input/output pin.
USB_HSTEN1 — Host Enabled status for USB port 1.
MAT1[1] — Match output for Timer 1, channel 1.
P1[26] — General purpose digital input/output pin.
P1[26]/
USB_SSPND1/
LCDVD[12]/
LCDVD[20]/
PWM1[6]/CAP0[0]
PWM1[6] — Pulse Width Modulator 1, channel 6 output.
CAP0[0] — Capture input for Timer 0, channel 0.
P1[27] — General purpose digital input/output pin.
P1[27]/USB_INT1/ 88[1]
LCDVD[13]/
LCDVD[21]/
USB_OVRCR1/
CAP0[1]
I/O
I
USB_INT1 — USB port 1 OTG transceiver interrupt (OTG
transceiver).[16]
O
I
USB_OVRCR1 — USB port 1 Over-Current status.
CAP0[1] — Capture input for Timer 0, channel 1.
P1[28] — General purpose digital input/output pin.
I
P1[28]/USB_SCL1/ 90[1]
LCDVD[14]/
LCDVD[22]/
T13[1]
I/O
I/O
O
I
PCAP1[0]/MAT0[0]
PCAP1[0] — Capture input for PWM1, channel 0.
MAT0[0] — Match output for Timer 0, channel 0.
O
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P1[29]/USB_SDA1/ 92[1]
LCDVD[15]/
LCDVD[23]/
U14[1]
I/O
I/O
O
I
P1[29] — General purpose digital input/output pin.
PCAP1[1]/MAT0[1]
PCAP1[1] — Capture input for PWM1, channel 1.
MAT0[1] — Match output for Timer 0, channel 0.
P1[30] — General purpose digital input/output pin.
USB_PWRD2 — Power Status for USB port 2.
VBUS — Monitors the presence of USB bus power.
Note: This signal must be HIGH for USB reset to occur.
AD0[4] — A/D converter 0, input 4.
O
I/O
I
P1[30]/
42[2]
P2[2]
USB_PWRD2/
VBUS/AD0[4]
I
I
P1[31]/
USB_OVRCR2/
SCK1/AD0[5]
40[2]
P1[2]
I/O
I
P1[31] — General purpose digital input/output pin.
USB_OVRCR2 — Over-Current status for USB port 2.
SCK1 — Serial Clock for SSP1.
I/O
I
AD0[5] — A/D converter 0, input 5.
P2[0] to P2[31]
I/O
Port 2: Port 2 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 2 pins depends upon the pin function selected
via the pin connect block.
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P2[0]/PWM1[1]/
TXD1/TRACECLK/
LCDPWR
154[1]
B17[1]
I/O
O
O
O
O
I/O
O
I
P2[0] — General purpose digital input/output pin.
PWM1[1] — Pulse Width Modulator 1, channel 1 output.
TXD1 — Transmitter output for UART1.
P2[1]/PWM1[2]/
RXD1/PIPESTAT0/
LCDLE
152[1]
150[1]
144[1]
142[1]
140[1]
E14[1]
D15[1]
E16[1]
D17[1]
F16[1]
P2[1] — General purpose digital input/output pin.
PWM1[2] — Pulse Width Modulator 1, channel 2 output.
RXD1 — Receiver input for UART1.
O
O
I/O
O
I
P2[2]/PWM1[3]/
CTS1/PIPESTAT1/
LCDDCLK
P2[2] — General purpose digital input/output pin.
PWM1[3] — Pulse Width Modulator 1, channel 3 output.
CTS1 — Clear to Send input for UART1.
O
O
I/O
O
I
P2[3]/PWM1[4]/
DCD1/PIPESTAT2/
LCDFP
P2[3] — General purpose digital input/output pin.
PWM1[4] — Pulse Width Modulator 1, channel 4 output.
DCD1 — Data Carrier Detect input for UART1.
O
O
I/O
O
I
P2[4] — General purpose digital input/output pin.
PWM1[5] — Pulse Width Modulator 1, channel 5 output.
DSR1 — Data Set Ready input for UART1.
P2[5] — General purpose digital input/output pin.
PWM1[6] — Pulse Width Modulator 1, channel 6 output.
DTR1 — Data Terminal Ready output for UART1.
P2[4]/PWM1[5]/
DSR1/
TRACESYNC/
LCDENAB/LCDM
O
O
I/O
O
O
O
O
P2[5]/PWM1[6]/
DTR1/
TRACEPKT0/
LCDLP
LCDLP — Line synchronization pulse (STN). Horizontal synchronization
pulse (TFT).[17]
P2[6]/PCAP1[0]/
RI1/
TRACEPKT1/
LCDVD[0]/
LCDVD[4]
138[1]
E17[1]
I/O
I
P2[6] — General purpose digital input/output pin.
PCAP1[0] — Capture input for PWM1, channel 0.
RI1 — Ring Indicator input for UART1.
P2[7] — General purpose digital input/output pin.
RD2 — CAN2 receiver input.
I
O
O
I/O
I
P2[7]/RD2/
RTS1/
TRACEPKT2/
LCDVD[1]/
LCDVD[5]
136[1]
G16[1]
O
O
O
RTS1 — Request to Send output for UART1.
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P2[8]/TD2/TXD2/
TRACEPKT3/
LCDVD[2]/
134[1]
H15[1]
I/O
O
P2[8] — General purpose digital input/output pin.
TD2 — CAN2 transmitter output.
O
TXD2 — Transmitter output for UART2.
P2[9] — General purpose digital input/output pin.
LCDVD[6]
O
O
P2[9]/
132[1]
H16[1]
I/O
O
USB_CONNECT1/
RXD2/EXTIN0/
LCDVD[3]/
USB_CONNECT1 — USB1 SoftConnect control. Signal used to switch
an external 1.5 kΩ resistor under the software control. Used with the
SoftConnect USB feature.
LCDVD[7]
I
RXD2 — Receiver input for UART2.
I
I
P2[10]/EINT0
110[6]
N15[6]
I/O
P2[10] — General purpose digital input/output pin.
Note: LOW on this pin while RESET is LOW forces on-chip bootloader to
take over control of the part after a reset.
I
EINT0 — External interrupt 0 input.
P2[11]/EINT1/
LCDCLKIN/
MCIDAT1/
108[6]
T17[6]
I/O
I
P2[11] — General purpose digital input/output pin.
O
I2STX_CLK
I/O
I/O
MCIDAT1 — Data line 1 for SD/MMC interface.
I2STX_CLK — Transmit Clock. It is driven by the master and received by
the slave. Corresponds to the signal SCK in the I2S-bus specification.
P2[12]/EINT2/
LCDVD[4]/
LCDVD[3]/
LCDVD[8]/
LCDVD[18]/
MCIDAT2/
106[6]
N14[6]
I/O
I
P2[12] — General purpose digital input/output pin.
O
I/O
I/O
MCIDAT2 — Data line 2 for SD/MMC interface.
I2STX_WS — Transmit Word Select. It is driven by the master and
received by the slave. Corresponds to the signal WS in the I2S-bus
specification.
I2STX_WS
P2[13]/EINT3/
LCDVD[5]/
LCDVD[9]/
LCDVD[19]/
MCIDAT3/
102[6]
T16[6]
I/O
I
P2[13] — General purpose digital input/output pin.
O
I/O
I/O
MCIDAT3 — Data line 3 for SD/MMC interface.
I2STX_SDA
I2STX_SDA — Transmit data. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the I2S-bus specification.
P2[14]/CS2/
CAP2[0]/SDA1
91[6]
R12[6]
I/O
O
P2[14] — General purpose digital input/output pin.
CS2 — LOW active Chip Select 2 signal.
I
CAP2[0] — Capture input for Timer 2, channel 0.
SDA1 — I2C1 data input/output (this is not an open-drain pin).
P2[15] — General purpose digital input/output pin.
CS3 — LOW active Chip Select 3 signal.
I/O
I/O
O
P2[15]/CS3/
99[6]
P13[6]
CAP2[1]/SCL1
I
CAP2[1] — Capture input for Timer 2, channel 1.
SCL1 — I2C1 clock input/output (this is not an open-drain pin).
I/O
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P2[16]/CAS
87[1]
R11[1]
I/O
O
P2[16] — General purpose digital input/output pin.
CAS — LOW active SDRAM Column Address Strobe.
P2[17]/RAS
95[1]
59[1]
67[1]
73[1]
81[1]
85[1]
R13[1]
U3[1]
I/O
O
P2[17] — General purpose digital input/output pin.
RAS — LOW active SDRAM Row Address Strobe.
P2[18] — General purpose digital input/output pin.
CLKOUT0 — SDRAM clock 0.
P2[18]/
CLKOUT0
I/O
O
P2[19]/
CLKOUT1
R7[1]
I/O
O
P2[19] — General purpose digital input/output pin.
CLKOUT1 — SDRAM clock 1.
P2[20]/DYCS0
T8[1]
I/O
O
P2[20] — General purpose digital input/output pin.
DYCS0 — SDRAM chip select 0.
P2[21]/DYCS1
U11[1]
U12[1]
I/O
O
P2[21] — General purpose digital input/output pin.
DYCS1 — SDRAM chip select 1.
P2[22]/DYCS2/
CAP3[0]/SCK0
I/O
O
P2[22] — General purpose digital input/output pin.
DYCS2 — SDRAM chip select 2.
I
CAP3[0] — Capture input for Timer 3, channel 0.
SCK0 — Serial clock for SSP0.
I/O
I/O
O
P2[23]/DYCS3/
CAP3[1]/SSEL0
64[1]
U5[1]
P2[23] — General purpose digital input/output pin.
DYCS3 — SDRAM chip select 3.
I
CAP3[1] — Capture input for Timer 3, channel 1.
SSEL0 — Slave Select for SSP0.
I/O
I/O
O
P2[24]/
CKEOUT0
53[1]
54[1]
57[1]
P5[1]
R4[1]
T4[1]
P2[24] — General purpose digital input/output pin.
CKEOUT0 — SDRAM clock enable 0.
P2[25]/
CKEOUT1
I/O
O
P2[25] — General purpose digital input/output pin.
CKEOUT1 — SDRAM clock enable 1.
P2[26]/
I/O
O
P2[26] — General purpose digital input/output pin.
CKEOUT2 — SDRAM clock enable 2.
CKEOUT2/
MAT3[0]/MISO0
O
MAT3[0] — Match output for Timer 3, channel 0.
MISO0 — Master In Slave Out for SSP0.
I/O
I/O
O
P2[27]/
CKEOUT3/
MAT3[1]/MOSI0
47[1]
P3[1]
P2[27] — General purpose digital input/output pin.
CKEOUT3 — SDRAM clock enable 3.
O
MAT3[1] — Match output for Timer 3, channel 1.
MOSI0 — Master Out Slave In for SSP0.
I/O
I/O
O
P2[28]/
DQMOUT0
49[1]
43[1]
31[1]
P4[1]
N3[1]
L4[1]
P2[28] — General purpose digital input/output pin.
DQMOUT0 — Data mask 0 used with SDRAM and static devices.
P2[29] — General purpose digital input/output pin.
DQMOUT1 — Data mask 1 used with SDRAM and static devices.
P2[30] — General purpose digital input/output pin.
DQMOUT2 — Data mask 2 used with SDRAM and static devices.
MAT3[2] — Match output for Timer 3, channel 2.
SDA2 — I2C2 data input/output (this is not an open-drain pin).
P2[29]/
DQMOUT1
I/O
O
P2[30]/
DQMOUT2/
MAT3[2]/SDA2
I/O
O
O
I/O
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P2[31]/
DQMOUT3/
MAT3[3]/SCL2
39[1]
N2[1]
I/O
O
P2[31] — General purpose digital input/output pin.
DQMOUT3 — Data mask 3 used with SDRAM and static devices.
O
MAT3[3] — Match output for Timer 3, channel 3.
I/O
I/O
SCL2 — I2C2 clock input/output (this is not an open-drain pin).
P3[0] to P3[31]
Port 3: Port 3 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 3 pins depends upon the pin function selected
via the pin connect block.
P3[0]/D0
P3[1]/D1
P3[2]/D2
P3[3]/D3
P3[4]/D4
P3[5]/D5
P3[6]/D6
P3[7]/D7
P3[8]/D8
P3[9]/D9
P3[10]/D10
P3[11]/D11
P3[12]/D12
P3[13]/D13
P3[14]/D14
197[1]
201[1]
207[1]
3[1]
B4[1]
B3[1]
B1[1]
E4[1]
F2[1]
G1[1]
J1[1]
L1[1]
D8[1]
C5[1]
B2[1]
D5[1]
D4[1]
C1[1]
H2[1]
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P3[0] — General purpose digital input/output pin.
D0 — External memory data line 0.
P3[1] — General purpose digital input/output pin.
D1 — External memory data line 1.
P3[2] — General purpose digital input/output pin.
D2 — External memory data line 2.
P3[3] — General purpose digital input/output pin.
D3 — External memory data line 3.
13[1]
17[1]
23[1]
27[1]
191[1]
199[1]
205[1]
208[1]
1[1]
P3[4] — General purpose digital input/output pin.
D4 — External memory data line 4.
P3[5] — General purpose digital input/output pin.
D5 — External memory data line 5.
P3[6] — General purpose digital input/output pin.
D6 — External memory data line 6.
P3[7] — General purpose digital input/output pin.
D7 — External memory data line 7.
P3[8] — General purpose digital input/output pin.
D8 — External memory data line 8.
P3[9] — General purpose digital input/output pin.
D9 — External memory data line 9.
P3[10] — General purpose digital input/output pin.
D10 — External memory data line 10.
P3[11] — General purpose digital input/output pin.
D11 — External memory data line 11.
P3[12] — General purpose digital input/output pin.
D12 — External memory data line 12.
7[1]
P3[13] — General purpose digital input/output pin.
D13 — External memory data line 13.
21[1]
P3[14] — General purpose digital input/output pin.
D14 — External memory data line 14. On POR, this pin serves as the
BOOT0 pin.
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P3[15]/D15
28[1]
M1[1]
I/O
I/O
P3[15] — General purpose digital input/output pin.
D15 — External memory data line 15. On POR, this pin serves as the
BOOT1 pin (flashless parts only).
BOOT[1:0] = 00 selects 8-bit external memory on CS1.
BOOT[1:0] = 01 is reserved. Do not use.
BOOT[1:0] = 10 selects 32-bit external memory on CS1.
BOOT[1:0] = 11 selects 16-bit external memory on CS1.
P3[16] — General purpose digital input/output pin.
D16 — External memory data line 16.
P3[16]/D16/
PWM0[1]/TXD1
137[1]
143[1]
151[1]
161[1]
167[1]
175[1]
195[1]
65[1]
F17[1]
F15[1]
C15[1]
B14[1]
A13[1]
C10[1]
C6[1]
I/O
I/O
O
PWM0[1] — Pulse Width Modulator 0, output 1.
TXD1 — Transmitter output for UART1.
O
P3[17]/D17/
PWM0[2]/RXD1
I/O
I/O
O
P3[17] — General purpose digital input/output pin.
D17 — External memory data line 17.
PWM0[2] — Pulse Width Modulator 0, output 2.
RXD1 — Receiver input for UART1.
I
P3[18]/D18/
PWM0[3]/CTS1
I/O
I/O
O
P3[18] — General purpose digital input/output pin.
D18 — External memory data line 18.
PWM0[3] — Pulse Width Modulator 0, output 3.
CTS1 — Clear to Send input for UART1.
I
P3[19]/D19/
PWM0[4]/DCD1
I/O
I/O
O
P3[19] — General purpose digital input/output pin.
D19 — External memory data line 19.
PWM0[4] — Pulse Width Modulator 0, output 4.
DCD1 — Data Carrier Detect input for UART1.
P3[20] — General purpose digital input/output pin.
D20 — External memory data line 20.
I
P3[20]/D20/
PWM0[5]/DSR1
I/O
I/O
O
PWM0[5] — Pulse Width Modulator 0, output 5.
DSR1 — Data Set Ready input for UART1.
P3[21] — General purpose digital input/output pin.
D21 — External memory data line 21.
I
P3[21]/D21/
PWM0[6]/DTR1
I/O
I/O
O
PWM0[6] — Pulse Width Modulator 0, output 6.
DTR1 — Data Terminal Ready output for UART1.
P3[22] — General purpose digital input/output pin.
D22 — External memory data line 22.
O
P3[22]/D22/
PCAP0[0]/RI1
I/O
I/O
I
PCAP0[0] — Capture input for PWM0, channel 0.
RI1 — Ring Indicator input for UART1.
I
P3[23]/D23/
CAP0[0]/
PCAP1[0]
T6[1]
I/O
I/O
I
P3[23] — General purpose digital input/output pin.
D23 — External memory data line 23.
CAP0[0] — Capture input for Timer 0, channel 0.
PCAP1[0] — Capture input for PWM1, channel 0.
I
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P3[24]/D24/
CAP0[1]/
PWM1[1]
58[1]
R5[1]
I/O
I/O
I
P3[24] — General purpose digital input/output pin.
D24 — External memory data line 24.
CAP0[1] — Capture input for Timer 0, channel 1.
PWM1[1] — Pulse Width Modulator 1, output 1.
P3[25] — General purpose digital input/output pin.
D25 — External memory data line 25.
O
P3[25]/D25/
MAT0[0]/
PWM1[2]
56[1]
55[1]
203[1]
5[1]
U2[1]
T3[1]
A1[1]
D2[1]
F3[1]
H3[1]
J3[1]
I/O
I/O
O
MAT0[0] — Match output for Timer 0, channel 0.
PWM1[2] — Pulse Width Modulator 1, output 2.
P3[26] — General purpose digital input/output pin.
D26 — External memory data line 26.
O
P3[26]/D26/
MAT0[1]/
PWM1[3]
I/O
I/O
O
MAT0[1] — Match output for Timer 0, channel 1.
PWM1[3] — Pulse Width Modulator 1, output 3.
P3[27] — General purpose digital input/output pin.
D27 — External memory data line 27.
O
P3[27]/D27/
CAP1[0]/
PWM1[4]
I/O
I/O
I
CAP1[0] — Capture input for Timer 1, channel 0.
PWM1[4] — Pulse Width Modulator 1, output 4.
P3[28] — General purpose digital input/output pin.
D28 — External memory data line 28.
O
P3[28]/D28/
CAP1[1]/
PWM1[5]
I/O
I/O
I
CAP1[1] — Capture input for Timer 1, channel 1.
PWM1[5] — Pulse Width Modulator 1, output 5.
P3[29] — General purpose digital input/output pin.
D29 — External memory data line 29.
O
P3[29]/D29/
MAT1[0]/
PWM1[6]
11[1]
19[1]
25[1]
I/O
I/O
O
MAT1[0] — Match output for Timer 1, channel 0.
PWM1[6] — Pulse Width Modulator 1, output 6.
P3[30] — General purpose digital input/output pin.
D30 — External memory data line 30.
O
P3[30]/D30/
MAT1[1]/
RTS1
I/O
I/O
O
MAT1[1] — Match output for Timer 1, channel 1.
RTS1 — Request to Send output for UART1.
P3[31] — General purpose digital input/output pin.
D31 — External memory data line 31.
O
P3[31]/D31/
MAT1[2]
I/O
I/O
O
MAT1[2] — Match output for Timer 1, channel 2.
P4[0] to P4[31]
I/O
Port 4: Port 4 is a 32-bit I/O port with individual direction controls for each
bit. The operation of port 4 pins depends upon the pin function selected
via the pin connect block.
P4[0]/A0
P4[1]/A1
P4[2]/A2
75[1]
79[1]
83[1]
U9[1]
I/O
I/O
I/O
I/O
I/O
I/O
P4[0] — ]General purpose digital input/output pin.
A0 — External memory address line 0.
U10[1]
T11[1]
P4[1] — General purpose digital input/output pin.
A1 — External memory address line 1.
P4[2] — General purpose digital input/output pin.
A2 — External memory address line 2.
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
97[1]
Ball
U16[1]
Type Description
P4[3] — General purpose digital input/output pin.
A3 — External memory address line 3.
P4[3]/A3
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
P4[4]/A4
103[1]
107[1]
113[1]
121[1]
127[1]
131[1]
135[1]
145[1]
149[1]
155[1]
159[1]
173[1]
101[1]
104[1]
105[1]
111[1]
109[1]
R15[1]
R16[1]
M14[1]
L16[1]
J17[1]
H17[1]
G17[1]
F14[1]
C16[1]
B16[1]
B15[1]
A11[1]
U17[1]
P14[1]
P15[1]
P16[1]
R17[1]
P4[4] — General purpose digital input/output pin.
A4 — External memory address line 4.
P4[5]/A5
P4[5] — General purpose digital input/output pin.
A5 — External memory address line 5.
P4[6]/A6
P4[6] — General purpose digital input/output pin.
A6 — External memory address line 6.
P4[7]/A7
P4[7] — General purpose digital input/output pin.
A7 — External memory address line 7.
P4[8]/A8
P4[8] — General purpose digital input/output pin.
A8 — External memory address line 8.
P4[9]/A9
P4[9] — General purpose digital input/output pin.
A9 — External memory address line 9.
P4[10]/A10
P4[11]/A11
P4[12]/A12
P4[13]/A13
P4[14]/A14
P4[15]/A15
P4[16]/A16
P4[17]/A17
P4[18]/A18
P4[19]/A19
P4[10] — General purpose digital input/output pin.
A10 — External memory address line 10.
P4[11] — General purpose digital input/output pin.
A11 — External memory address line 11.
P4[12] — General purpose digital input/output pin.
A12 — External memory address line 12.
P4[13] — General purpose digital input/output pin.
A13 — External memory address line 13.
P4[14] — General purpose digital input/output pin.
A14 — External memory address line 14.
P4[15] — General purpose digital input/output pin.
A15 — External memory address line 15.
P4[16] — General purpose digital input/output pin.
A16 — External memory address line 16.
P4[17] — General purpose digital input/output pin.
A17 — External memory address line 17.
P4[18] — General purpose digital input/output pin.
A18 — External memory address line 18.
P4[19] — General purpose digital input/output pin.
A19 — External memory address line 19.
P4[20] — General purpose digital input/output pin.
A20 — External memory address line 20.
SDA2 — I2C2 data input/output (this is not an open-drain pin).
SCK1 — Serial Clock for SSP1.
P4[20]/A20/
SDA2/SCK1
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
Pin
Ball
Type Description
P4[21]/A21/
SCL2/SSEL1
115[1]
M15[1]
I/O
I/O
I/O
I/O
I/O
I/O
O
P4[21] — General purpose digital input/output pin.
A21 — External memory address line 21.
SCL2 — I2C2 clock input/output (this is not an open-drain pin).
SSEL1 — Slave Select for SSP1.
P4[22]/A22/
TXD2/MISO1
123[1]
K14[1]
P4[22] — General purpose digital input/output pin.
A22 — External memory address line 22.
TXD2 — Transmitter output for UART2.
I/O
I/O
I/O
I
MISO1 — Master In Slave Out for SSP1.
P4[23]/A23/
RXD2/MOSI1
129[1]
J15[1]
P4[23] — General purpose digital input/output pin.
A23 — External memory address line 23.
RXD2 — Receiver input for UART2.
I/O
I/O
O
MOSI1 — Master Out Slave In for SSP1.
P4[24]/OE
183[1]
179[1]
119[1]
139[1]
170[1]
B8[1]
P4[24] — General purpose digital input/output pin.
OE — LOW active Output Enable signal.
P4[25]/WE
P4[26]/BLS0
P4[27]/BLS1
B9[1]
I/O
O
P4[25] — General purpose digital input/output pin.
WE — LOW active Write Enable signal.
L15[1]
G15[1]
C11[1]
I/O
O
P4[26] — General purpose digital input/output pin.
BLS0 — LOW active Byte Lane select signal 0.
P4[27] — General purpose digital input/output pin.
BLS1 — LOW active Byte Lane select signal 1.
P4 [28] — General purpose digital input/output pin.
BLS2 — LOW active Byte Lane select signal 2.
TXD3 — Transmitter output for UART3.
I/O
O
P4[28]/BLS2/
MAT2[0]/LCDVD[6]/
LCDVD[10]/
LCDVD[2]/
I/O
O
O
TXD3
O
O
P4[29]/BLS3/
MAT2[1]
LCDVD[7]/
LCDVD[11]/
LCDVD[3]/RXD3
176[1]
B10[1]
I/O
O
P4[29] — General purpose digital input/output pin.
BLS3 — LOW active Byte Lane select signal 3.
RXD3 — Receiver input for UART3.
O
O
I
P4[30]/CS0
P4[31]/CS1
ALARM
187[1]
193[1]
37[8]
B7[1]
A4[1]
N1[8]
I/O
O
P4[30] — General purpose digital input/output pin.
CS0 — LOW active Chip Select 0 signal.
I/O
O
P4[31] — General purpose digital input/output pin.
CS1 — LOW active Chip Select 1 signal.
O
ALARM — RTC controlled output. This is a 1.8 V pin. It goes HIGH when
a RTC alarm is generated.
USB_D−2
52
9[1]
U1
F4[1]
I/O
I
USB_D−2 — USB port 2 bidirectional D− line.
DBGEN
DBGEN — JTAG interface control signal. Also used for boundary
scanning.
TDO
TDI
2[1]
4[1]
D3[1]
C2[1]
O
I
TDO — Test Data Out for JTAG interface.
TDI — Test Data In for JTAG interface.
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Chapter 8: LPC24XX Pin configuration
Table 124. LPC2470/78 pin description …continued
Symbol
TMS
Pin
6[1]
8[1]
Ball
E3[1]
D1[1]
E2[1]
Type Description
I
I
I
TMS — Test Mode Select for JTAG interface.
TRST — Test Reset for JTAG interface.
TCK — Test Clock for JTAG interface. This clock must be slower than 1⁄6
TRST
TCK
10[1]
of the CPU clock (CCLK) for the JTAG interface to operate.
RTCK
206[1]
C3[1]
I/O
RTCK — JTAG interface control signal.
Note: LOW on this pin while RESET is LOW enables ETM pins (P2[9:0])
to operate as Trace port after reset.
RSTOUT
RESET
29
K3
O
I
RSTOUT — This is a 3.3 V pin. LOW on this pin indicates UM10237
being in Reset state.
35[7]
M2[7]
external reset input: A LOW on this pin resets the device, causing I/O
ports and peripherals to take on their default states, and processor
execution to begin at address 0. TTL with hysteresis, 5 V tolerant.
XTAL1
XTAL2
RTCX1
RTCX2
VSSIO
44[8]
46[8]
34[8]
36[8]
M4[8]
N4[8]
K2[8]
L2[8]
I
Input to the oscillator circuit and internal clock generator circuits.
Output from the oscillator amplifier.
O
I
Input to the RTC oscillator circuit.
O
I
Output from the RTC oscillator circuit.
33, 63,
77, 93,
114,
L3, T5,
R9,P12,
N16,
ground: 0 V reference for the digital IO pins.
133,
H14,
148,
E15,
169,
189,
200[9]
A12, B6,
A2[9]
VSSCORE
VSSA
32, 84,
172[9]
22[10]
K4, P10, I
D12[9]
ground: 0 V reference for the core.
J2[10]
I
analog ground: 0 V reference. This should nominally be the same
voltage as VSSIO/VSSCORE, but should be isolated to minimize noise and
error.
VDD(3V3)
15, 60,
71, 89,
112,
G3, P6,
P8, U13,
P17,
I
3.3 V supply voltage: This is the power supply voltage for the I/O ports.
125,
K16,
146,
C17,
165,
181,
198[11]
B13, C9,
D7[11]
n.c.
30, 117, J4, L14,
I
not connected pins: These pins must be left unconnected (floating).
141[12]
G14[12]
VDD(DCDC)(3V3)
VDDA
26, 86,
174[13]
H4, P11, I
D11[13]
3.3 V DC-to-DC converter supply voltage: This is the power supply for
the on-chip DC-to-DC converter.
20[14]
24[14]
38[14]
G4[14]
K1[14]
M3[14]
I
I
I
analog 3.3 V pad supply voltage: This should be nominally the same
voltage as VDD(3V3) but should be isolated to minimize noise and error.
This voltage is used to power the ADC and DAC.
VREF
VBAT
ADC reference: This should be nominally the same voltage as VDD(3V3)
but should be isolated to minimize noise and error. The level on this pin is
used as a reference for ADC and DAC.
RTC power supply: 3.3 V on this pin supplies the power to the RTC
peripheral.
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[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
[2] 5 V tolerant pad providing digital I/O functions (with TTL levels and hysteresis) and analog input. When configured as a ADC input,
digital section of the pad is disabled.
[3] 5 V tolerant pad providing digital I/O with TTL levels and hysteresis and analog output function. When configured as the DAC output,
digital section of the pad is disabled.
[4] Open-drain 5 V tolerant digital I/O pad, compatible with I2C-bus 400 kHz specification. It requires an external pull-up to provide output
functionality. When power is switched off, this pin connected to the I2C-bus is floating and does not disturb the I2C lines. Open-drain
configuration applies to all functions on this pin.
[5] Pad provides digital I/O and USB functions. It is designed in accordance with the USB specification, revision 2.0 (Full-speed and
Low-speed mode only).
[6] 5 V tolerant pad with 5 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.
[7] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
[8] Pad provides special analog functionality.
[9] Pad provides special analog functionality.
[10] Pad provides special analog functionality.
[11] Pad provides special analog functionality.
[12] Pad provides special analog functionality.
[13] Pad provides special analog functionality.
[14] Pad provides special analog functionality.
[15] Either the I2S function or the LCD function is selectable.
[16] Either the USB OTG function or the LCD function is selectable.
[17] Either the trace function or the LCD function is selectable.
[18] Either one of the external interrupts EINT1 to EINT3 or the LCD function is selectable.
[19] Either one of the timer outputs MAT2[1] and MAT2[0] or the LCD function is selectable.
6. LPC2460/70 boot control
The flashless LPC2460 and LPC2470 use pins P3[15]/D15 and P3[14]/D14 for
configuring the external memory bus during the boot process. These pins are sampled
pins.
Table 125. Boot control on pins P3[15]/D15 and P3/14]/D14
P3[15]/D15 P3[14]/D14 Description
BOOT1
BOOT0
0
0
1
1
0
1
0
1
Boot from 8-bit external memory on CS1. Sampled on POR signal.
Reserved. Do not use.
Boot from 32-bit external memory on CS1. Sampled on POR signal.
Boot from 16-bit external memory on CS1. Sampled on POR signal.
During the boot process, external memory banks 0 and 1 are configured with the same
data bus width determined by the setting of the two boot pins P3[15]/D15 and P3[14]/D14.
Unused address pins (A0 when booting from 16-bit wide external memory, A1 and A0
when booting from 32-bit wide memory) are configured as GPIO.
0x3) and branches to address 0x0. The external boot memory must be connected to chip
select 1 (CS1). Note that the address range of chip select 1 and 0 is swapped because
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Chapter 8: LPC24XX Pin configuration
Therefore, the user code residing in the external boot memory must be linked to execute
from address location 0x8000 0000 (EMC bank 0 address).
Remark: The external boot option is supported only for flashless devices LPC2460 and
LPC2470.
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Chapter 9: LPC24XX Pin connect
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User manual
1. How to read this chapter
The LPC2400 parts have different pin configurations depending on the number of pins.
parts:
• Only LPC2470 and LPC2478 have an LCD controller.
• LPC2458 has an 16-bit external memory controller, LPC2460/68/70/78 have 32-bit
external memory controller.
• All parts can have ETM functions enabled or disabled.
• Ethernet and CAN interface are not available on LPC2420.
Table 126. LPC2400 PINSEL register use
PINSEL
register
LPC2458
Functions LPC2420
not
Functions LPC2460/68 Functions LPC2470/78 Functions
not
not
not
available
available
available
available
-
-
-
-
-
-
-
LCD
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
PINSEL8
-
PINSEL11 -
-
-
-
-
-
-
-
-
2. Description
The pin connect block allows selected pins of the microcontroller to have more than one
function. Configuration registers control the multiplexers to allow connection between the
pin and the on chip peripherals.
Peripherals should be connected to the appropriate pins prior to being activated, and prior
to any related interrupt(s) being enabled. Activity of any enabled peripheral function that is
not mapped to a related pin should be considered undefined.
Selecting a single function on a port pin completely excludes all other functions otherwise
available on the same pin.
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3. Pin function select register values
The PINSEL registers control the functions of device pins as shown below. Pairs of bits in
these registers correspond to specific device pins.
Table 127. Pin function select register bits
PINSEL0 to
Function
Value after Reset
PINSEL9 Values
00
01
10
11
Primary (default) function, typically GPIO port
First alternate function
00
Second alternate function
Third alternate function
The direction control bit in the GPIO registers is effective only when the GPIO function is
selected for a pin. For other functions, direction is controlled automatically. Each
derivative typically has a different pinout and therefore a different set of functions possible
for each pin. Details for a specific derivative may be found in the appropriate data sheet.
4. Pin mode select register values
The PINMODE registers control the on-chip pull-up/pull-down resistor feature for all GPIO
ports. Two bits are used to control a port pin. PINMODEn register bits are reserved for not
available pins, e.g. pins P2[15:14] are not available on LPC2458 and are reserved in
PINSEL5 and PINMODE5.
Table 128. Pin Mode Select register bits
PINMODE0 to
PINMODE9
Values
Function
Value after Reset
00
01
10
11
Pin has an on-chip pull-up resistor enabled.
Reserved. This value should not be used.
00
Pin has neither pull-up nor pull-down resistor enabled.
Pin has an on-chip pull-down resistor enabled.
5. Register description
Remark: The LCD pins in the PINSEL registers are available on the LPC247x only.
Table 129. Summary of pin connect block registers
Name
Description
PINSEL0
PINSEL1
PINSEL2
PINSEL3
PINSEL4
PINSEL5
Pin function select register 0
Pin function select register 1
Pin function select register 2
Pin function select register 3
Pin function select register 4
Pin function select register 5
R/W
R/W
R/W
R/W
R/W
R/W
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0xE002 C000
0xE002 C004
0xE002 C008
0xE002 C00C
0xE002 C010
0xE002 C014
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Table 129. Summary of pin connect block registers
Name
Description
Access Reset Value[1] Address
PINSEL6
PINSEL7
PINSEL8
PINSEL9
PINSEL10
PINSEL 11
Pin function select register 6
Pin function select register 7
Pin function select register 8
Pin function select register 9
Pin function select register 10
R/W
R/W
R/W
R/W
R/W
R/W
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0xE002 C018
0xE002 C01C
0xE002 C020
0xE002 C024
0xE002 C028
0xE002 C02C
Pin function select register 11
(LPC247x only)
PINMODE0
PINMODE1
PINMODE2
PINMODE3
PINMODE4
PINMODE5
PINMODE6
PINMODE7
PINMODE8
PINMODE9
Pin mode select register 0
Pin mode select register 1
Pin mode select register 2
Pin mode select register 3
Pin mode select register 4
Pin mode select register 5
Pin mode select register 6
Pin mode select register 7
Pin mode select register 8
Pin mode select register 9
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0xE002 C040
0xE002 C044
0xE002 C048
0xE002 C04C
0xE002 C050
0xE002 C054
0xE002 C058
0xE002 C05C
0xE002 C060
0xE002 C064
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
Pin control module register reset values
On power-on reset and BOD reset, all registers in this module are reset to '0'.
On external reset and watchdog reset:
• The corresponding bits for P0[31:0], P1[31:0], P2[13:0] are always reset to '0'.
• For all the other bits:
status flags”), they retain their values for external memory interface
– else if the EMC_Reset_Disable = 0, they are reset to '0'.
5.1 Pin Function Select register 0 (PINSEL0 - 0xE002 C000)
The PINSEL0 register controls the functions of the pins according to the settings listed in
enhanced GPIO function is selected for port 0) is effective only when the GPIO function is
selected for a pin. For other functions, direction is controlled automatically.
Table 130. Pin function select register 0 (PINSEL0 - address 0xE002 C000) bit description
PINSEL0 Pin
Function when Function when 01 Function
Function
when 11
Reset
value
name 00
when 10
1:0
3:2
5:4
P0[0]
GPIO Port 0.0
GPIO Port 0.1
GPIO Port 0.2
RD1
TD1
TXD3
SDA1
00
00
00
P0[1]
P0[2]
RXD3
SCL1
TXD0
Reserved
Reserved
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Table 130. Pin function select register 0 (PINSEL0 - address 0xE002 C000) bit description
PINSEL0 Pin
Function when Function when 01 Function
Function
when 11
Reset
value
name 00
when 10
Reserved
RD2
7:6
9:8
P0[3]
GPIO Port 0.3
GPIO Port 0.4
RXD0
Reserved
CAP2[0]
00
00
P0[4]
P0[5]
P0[6]
P0[7]
P0[8]
P0[9]
I2SRX_CLK/
LCDVD[0]
11:10
13:12
15:14
17:16
19:18
GPIO Port 0.5
GPIO Port 0.6
GPIO Port 0.7
GPIO Port 0.8
GPIO Port 0.9
I2SRX_WS/
LCDVD[1]
TD2
CAP2[1]
MAT2[0]
MAT2[1]
MAT2[2]
MAT2[3]
00
00
00
00
00
I2SRX_SDA/
LCDVD[8]
SSEL1
SCK1
MISO1
MOSI1
I2STX_CLK/
LCDVD[9]
I2STX_WS/
LCDVD[16]
I2STX_SDA/
LCDVD[17]
21:20
23:22
25:24
27:26
29:28
P0[10] GPIO Port 0.10 TXD2
SDA2
SCL2
MAT3[0]
MAT3[1]
AD0[6]
00
00
00
00
00
P0[11] GPIO Port 0.11 RXD2
P0[12] GPIO Port 0.12 USB_PPWR2
P0[13] GPIO Port 0.13 USB_UP_LED2
P0[14] GPIO Port 0.14 USB_HSTEN2
MISO1
MOSI1
AD0[7]
USB_CONN SSEL1
ECT2
31:30
P0[15] GPIO Port 0.15 TXD1
SCK0
SCK
00
5.2 Pin Function Select Register 1 (PINSEL1 - 0xE002 C004)
The PINSEL1 register controls the functions of the pins as per the settings listed in
enhanced GPIO function is selected for port 0) register is effective only when the GPIO
function is selected for a pin. For other functions direction is controlled automatically.
Table 131. Pin function select register 1 (PINSEL1 - address 0xE002 C004) bit description
PINSEL1 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
1:0
P0[16]
P0[17]
P0[18]
P0[19]
P0[20]
P0[21]
P0[22]
P0[23]
P0[24]
P0[25]
P0[26]
GPIO Port 0.16 RXD1
GPIO Port 0.17 CTS1
GPIO Port 0.18 DCD1
GPIO Port 0.19 DSR1
GPIO Port 0.20 DTR1
GPIO Port 0.21 RI1
SSEL0
SSEL
MISO
MOSI
SDA1
SCL1
RD1
00
00
00
00
00
00
00
00
00
00
00
00
00
3:2
MISO0
5:4
MOSI0
7:6
MCICLK
MCICMD
MCIPWR
MCIDAT0
I2SRX_CLK
I2SRX_WS
9:8
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
GPIO Port 0.22 RTS1
GPIO Port 0.23 AD0[0]
GPIO Port 0.24 AD0[1]
GPIO Port 0.25 AD0[2]
GPIO Port 0.26 AD0[3]
TD1
CAP3[0]
CAP3[1]
I2SRX_SDA TXD3
AOUT
RXD3
Reserved
Reserved
Reserved
Reserved
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Table 131. Pin function select register 1 (PINSEL1 - address 0xE002 C004) bit description
PINSEL1 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
27:26
29:28
31:30
P0[29]
P0[30]
P0[31]
GPIO Port 0.29 USB_D+1
GPIO Port 0.30 USB_D−1
GPIO Port 0.31 USB_D+2
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
00
00
00
[1] Pins P027] and P0[28] are open-drain for I2C0 and GPIO functionality for I2C-bus compliance.
5.3 Pin Function Select register 2 (PINSEL2 - 0xE002 C008)
The PINSEL2 register controls the functions of the pins as per the settings listed in
enhanced GPIO function is selected for port 1) is effective only when the GPIO function is
selected for a pin. For other functions, direction is controlled automatically.
Table 132. Pin function select register 2 (PINSEL2 - address 0xE002 C008) bit description
PINSEL2 Pin
name
Function when Function when Function
Function
when 11
Reset
value
00
01
when 10
Reserved
Reserved
MCICLK
MCICMD
Reserved
MCIPWR
1:0
P1[0]
P1[1]
P1[2]
P1[3]
P1[4]
P1[5]
P1[6]
P1[7]
P1[8]
GPIO Port 1.0
GPIO Port 1.1
GPIO Port 1.2
GPIO Port 1.3
GPIO Port 1.4
GPIO Port 1.5
GPIO Port 1.6
GPIO Port 1.7
GPIO Port 1.8
ENET_TXD0
ENET_TXD1
ENET_TXD2
ENET_TXD3
ENET_TX_EN
ENET_TX_ER
Reserved
Reserved
PWM0[1]
PWM0[2]
Reserved
PWM0[3]
PWM0[4]
PWM0[5]
Reserved
00
00
00
00
00
00
00
00
00
3:2
5:4
7:6
9:8
11:10
13:12
15:14
17:16
ENET_TX_CLK MCIDAT0
ENET_COL MCIDAT1
ENET_CRS_DV/ Reserved
ENET_CRS
19:18
21:20
23:22
25:24
27:26
29:28
31:30
P1[9]
GPIO Port 1.9
ENET_RXD0
Reserved
Reserved
MCIDAT2
MACIDAT3
Reserved
Reserved
Reserved
Reserved
PWM0[6]
PCAP0[0]
Reserved
Reserved
Reserved
00
00
00
P1[10]
P1[11]
P1[12]
P1[13]
P1[14]
P1[15]
GPIO Port 1.10 ENET_RXD1
GPIO Port 1.11 ENET_RXD2
GPIO Port 1.12 ENET_RXD3
GPIO Port 1.13 ENET_RX_DV
GPIO Port 1.14 ENET_RX_ER
00
00
00
GPIO Port 1.15 ENET_REF_CLK Reserved
/ENET_RX_CLK
5.4 Pin Function Select Register 3 (PINSEL3 - 0xE002 C00C)
The PINSEL3 register controls the functions of the pins as per the settings listed in
enhanced GPIO function is selected for port 1) is effective only when the GPIO function is
selected for a pin. For other functions, direction is controlled automatically.
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Table 133. Pin function select register 3 (PINSEL3 - address 0xE002 C00C) bit description
PINSEL3 Pin
name
Function when Function when Function
Function
when 11
Reset
value
00
01
when 10
Reserved
Reserved
1:0
3:2
5:4
7:6
9:8
P1[16] GPIO Port 1.16 ENET_MDC
P1[17] GPIO Port 1.17 ENET_MDIO
Reserved
Reserved
CAP1[0]
CAP1[1]
SCK0
00
00
00
00
00
P1[18] GPIO Port 1.18 USB_UP_LED1 PWM1[1]
P1[19] GPIO Port 1.19 USB_TX_E1
USB_PPWR1
P1[20] GPIO Port 1.20 USB_TX_DP1/ PWM1[2]
LCDVD[6]/
LCDVD[10]
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
27:26
P1[21] GPIO Port 1.21 USB_TX_DM1/ PWM1[3]
SSEL0
MAT1[0]
MISO0
MOSI0
00
00
00
00
00
00
00
00
00
LCDVD[7]/
LCDVD[11]
P1[22] GPIO Port 1.22 USB_RCV1/
USB_PW1
LCDVD[8]/
LCDVD[12]
P1[23] GPIO Port 1.23 USB_RX_DP1/ PWM1[4]
LCDVD[9]/
LCDVD[13]
P1[24] GPIO Port 1.24 USB_RX_DM1/ PWM1[5]
LCDVD[10]/
LCDVD[14]
P1[25] GPIO Port 1.25 USB_LS1/
LCDVD[11]/
USB_HSTEN1 MAT1[1]
LCDVD[15]
P1[26] GPIO Port 1.26 USB_SSPND1/ PWM1[6]
CAP0[0]
LCDVD[12]/
LCDVD[20]
P1[27] GPIO Port 1.27 USB_INT1/
LCDVD[13]/
USB_OVRCR1 CAP0[1]
LCDVD[21]
P1[28] GPIO Port 1.28 USB_SCL1/
LCDVD[14]/
PCAP1[0]
PCAP1[1]
VBUS
MAT0[0]
MAT0[1]
LCDVD[22]
P1[29] GPIO Port 1.29 USB_SDA1/
LCDVD[15]/
LCDVD[23]
29:28
31:30
P1[30] GPIO Port 1.30 USB_PWRD2
AD0[4]
AD0[5]
00
00
P1[31] GPIO Port 1.31 USB_OVRCR2 SCK1
5.5 Pin Function Select Register 4 (PINSEL4 - 0xE002 C010)
The PINSEL4 register controls the functions of the pins as per the settings listed in
GPIO function is selected for a pin. For other functions, direction is controlled
automatically.
The bit functions in this register depend on the number of pins of each LPC2400 part. For
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Table 134. LPC2458 pin function select register 4 (PINSEL4 - address 0xE002 C010) bit
description
PINSEL4 Pin
name
Function when Function
Function
when 10
Function when Reset
00
when 01
PWM1[1]
PWM1[2]
PWM1[3]
PWM1[4]
PWM1[5]
PWM1[6]
PCAP1[0]
RD2
11
value
1:0
P2[0]
P2[1]
P2[2]
P2[3]
P2[4]
P2[5]
P2[6]
P2[7]
P2[8]
P2[9]
GPIO Port 2.0
GPIO Port 2.1
GPIO Port 2.2
GPIO Port 2.3
GPIO Port 2.4
GPIO Port 2.5
GPIO Port 2.6
GPIO Port 2.7
GPIO Port 2.8
GPIO Port 2.9
TXD1
RXD1
CTS1
DCD1
DSR1
DTR1
RI1
TRACECLK[1]
PIPESTAT0[1]
PIPESTAT1[1]
PIPESTAT2[1]
00
3:2
00
5:4
00
7:6
00
9:8
11:10
13:12
15:14
17:16
19:18
TRACEPKT0[1]
TRACEPKT1[1]
TRACEPKT2[1]
TRACEPKT3[1]
EXTIN0[1]
00
00
00
00
00
RTS1
TXD2
TD2
USB_CONN RXD2
ECT1
21:20
23:22
P2[10]
P2[11]
GPIO Port 2.10 EINT0
GPIO Port 2.11 EINT1/
Reserved
MCIDAT1
Reserved
00
00
I2STX_CLK
LCDCLKIN
GPIO Port 2.12 EINT2/
LCDVD[4]/
25:24
P2[12]
MCIDAT2
MCIDAT3
I2STX_WS
00
LCDVD[3]/
LCDVD[8]/
LCDVD[18]
27:26
P2[13]
GPIO Port 2.13 EINT3/
I2STX_SDA
00
LCDVD[5]/
LCDVD[9]/
LCDVD[19]
29:28
31:30
P2[14]
P2[15]
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
-
-
[1] See Section 9–5.11 “Pin Function Select Register 10 (PINSEL10 - 0xE002 C028)”for details on using the
ETM functionality.
Table 135. LPC2420/60/68/70/78 pin function select register 4 (PINSEL4 - address
0xE002 C010) bit description
PINSEL4 Pin
name
Function when Function
Function
when 10
Function when Reset
00
when 01
11
value
1:0
3:2
5:4
7:6
9:8
P2[0]
P2[1]
P2[2]
P2[3]
P2[4]
GPIO Port 2.0
PWM1[1]
TXD1
RXD1
CTS1
DCD1
DSR1
LCDPWR
LCDLE
LCDDCLK
LCDFP
00
GPIO Port 2.1
GPIO Port 2.2
GPIO Port 2.3
GPIO Port 2.4
PWM1[2]
PWM1[3]
PWM1[4]
PWM1[5]
00
00
00
LCDENAB/
LCDM
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Table 135. LPC2420/60/68/70/78 pin function select register 4 (PINSEL4 - address
0xE002 C010) bit description
PINSEL4 Pin Function when Function
name
Function
when 10
Function when Reset
11 value
00
when 01
11:10
P2[5]
GPIO Port 2.5
PWM1[6]
DTR1
LCDLP
13:12
P2[6]
GPIO Port 2.6
GPIO Port 2.7
GPIO Port 2.8
GPIO Port 2.9
PCAP1[0]
RD2
RI1
LCDVD[0]/
LCDVD[4]
LCDVD[1]/
LCDVD[5]
LCDVD[2]/
LCDVD[6]
15:14
17:16
19:18
P2[7]
P2[8]
P2[9]
RTS1
TXD2
TD2
USB_CONN RXD2
ECT1
LCDVD[3]/
LCDVD[7]
00
21:20
23:22
P2[10]
P2[11]
GPIO Port 2.10 EINT0
GPIO Port 2.11 EINT1/
Reserved
MCIDAT1
Reserved
00
00
I2STX_CLK
LCDCLKIN
GPIO Port 2.12 EINT2/
LCDVD[4]/
25:24
P2[12]
MCIDAT2
I2STX_WS
I2STX_SDA
00
LCDVD[3]/
LCDVD[8]/
LCDVD[18]
27:26
P2[13]
GPIO Port 2.13 EINT3/
MCIDAT3
00
LCDVD[5]/
LCDVD[9]/
LCDVD[19]
29:28
31:30
P2[14]
P2[15]
GPIO Port 2.14 CS2
GPIO Port 2.15 CS3
CAP2[0]
CAP2[1]
SDA1
SCL1
00
00
[1] See Section 9–5.11 “Pin Function Select Register 10 (PINSEL10 - 0xE002 C028)”for details on using the
ETM functionality.
5.6 Pin Function Select Register 5 (PINSEL5 - 0xE002 C014)
The PINSEL5 register controls the functions of the pins as per the settings listed in
GPIO function is selected for a pin. For other functions, direction is controlled
automatically.
The bit functions in this register depend on the number of pins of each LPC2400 part. For
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Chapter 9: LPC24XX Pin connect
Table 136. LPC2458 pin function select register 5 (PINSEL5 - address 0xE002 C014) bit
description
PINSEL5 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
1:0
P2[16]
P2[17]
P2[18]
P2[19]
P2[20]
P2[21]
P2[22]
P2[23]
P2[24]
P2[25]
P2[26]
P2[27]
P2[28]
P2[29]
P2[30]
P2[31]
GPIO Port 2.16 CAS
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
3:2
GPIO Port 2.17 RAS
5:4
GPIO Port 2.18 CLKOUT0
GPIO Port 2.19 CLKOUT1
GPIO Port 2.20 DYCS0
GPIO Port 2.21 DYCS1
7:6
9:8
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
27:26
29:28
31:30
Reserved
Reserved
Reserved
Reserved
GPIO Port 2.24 CKEOUT0
GPIO Port 2.25 CKEOUT1
Reserved
Reserved
Reserved
Reserved
GPIO Port 2.28 DQMOUT0
GPIO Port 2.29 DQMOUT1
Reserved
Reserved
Reserved
Reserved
Table 137. LPC2420/60/68/70/78 pin function select register 5 (PINSEL5 - address
0xE002 C014) bit description
PINSEL5 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
1:0
P2[16]
P2[17]
P2[18]
P2[19]
P2[20]
P2[21]
P2[22]
P2[23]
P2[24]
P2[25]
P2[26]
P2[27]
P2[28]
P2[29]
P2[30]
P2[31]
GPIO Port 2.16 CAS
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
CAP3[0]
CAP3[1]
Reserved
Reserved
MAT3[0]
MAT3[1]
Reserved
Reserved
MAT3[2]
MAT3[3]
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
SCK0
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
3:2
GPIO Port 2.17 RAS
5:4
GPIO Port 2.18 CLKOUT0
GPIO Port 2.19 CLKOUT1
GPIO Port 2.20 DYCS0
GPIO Port 2.21 DYCS1
GPIO Port 2.22 DYSC2
GPIO Port 2.23 DYSC3
GPIO Port 2.24 CKEOUT0
GPIO Port 2.25 CKEOUT1
GPIO Port 2.26 CKEOUT2
GPIO Port 2.27 CKEOUT3
GPIO Port 2.28 DQMOUT0
GPIO Port 2.29 DQMOUT1
GPIO Port 2.30 DQMOUT2
GPIO Port 2.31 DQMOUT3
7:6
9:8
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
27:26
29:28
31:30
SSEL0
Reserved
Reserved
MISO0
MOSI0
Reserved
Reserved
SDA2
SCL2
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5.7 Pin Function Select Register 6 (PINSEL6 - 0xE002 C018)
The PINSEL6 register controls the functions of the pins as per the settings listed in
GPIO function is selected for a pin. For other functions, direction is controlled
automatically.
Table 138. Pin function select register 6 (PINSEL6 - address 0xE002 C018) bit description
PINSEL6 Pin
name
Function when Function
Function
when 10
Function
when 11
Reset
value
00
when 01
1:0
P3[0]
P3[1]
P3[2]
P3[3]
P3[4]
P3[5]
P3[6]
P3[7]
P3[8]
P3[9]
P3[10]
P3[11]
P3[12]
P3[13]
GPIO Port 3.0
GPIO Port 3.1
GPIO Port 3.2
GPIO Port 3.3
GPIO Port 3.4
GPIO Port 3.5
GPIO Port 3.6
GPIO Port 3.7
GPIO Port 3.8
GPIO Port 3.9
D0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
3:2
D1
5:4
D2
7:6
D3
9:8
D4
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
27:26
29:28
31:30
D5
D6
D7
D8
D9
GPIO Port 3.10 D10
GPIO Port 3.11 D11
GPIO Port 3.12 D12
GPIO Port 3.13 D13
5.8 Pin Function Select Register 7 (PINSEL7 - 0xE002 C01C)
The PINSEL7 register controls the functions of the pins as per the settings listed in
GPIO function is selected for a pin. For other functions, direction is controlled
automatically.
The bit functions in this register depend on the number of pins of each LPC2400 part. For
Table 139. LPC2458 pin function select register 7 (PINSEL7 - address 0xE002 C01C) bit
description
PINSEL7 Pin
name
Function when Function
Function
when 10
Function
when 11
Reset
value
00
when 01
Reserved
Reserved
Reserved
Reserved
1:0
3:2
5:4
7:6
P3[16]
P3[17]
P3[18]
P3[19]
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
00
00
00
00
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Table 139. LPC2458 pin function select register 7 (PINSEL7 - address 0xE002 C01C) bit
description
PINSEL7 Pin
name
Function when Function
Function
when 10
Function
when 11
Reset
value
00
when 01
Reserved
Reserved
Reserved
9:8
P3[20]
P3[21]
P3[22]
P3[23]
P3[24]
P3[25]
P3[26]
P3[27]
P3[28]
P3[29]
P3[30]
P3[31]
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
CAP0[0]
CAP0[1]
MAT0[0]
Reserved
Reserved
Reserved
PCAP1[0]
PWM1[1]
PWM1[2]
PWM1[3]
Reserved
Reserved
Reserved
Reserved
Reserved
00
00
00
00
00
00
00
00
00
00
00
00
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
27:26
29:28
31:30
GPIO Port 3.23 Reserved
GPIO Port 3.24 Reserved
GPIO Port 3.25 Reserved
GPIO Port 3.26 Reserved
MAT0[1]
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Table 140. LPC24520/60/68/70/78 pin function select register 7 (PINSEL7 - address
0xE002 C01C) bit description
PINSEL7 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
1:0
P3[16]
P3[17]
P3[18]
P3[19]
P3[20]
P3[21]
P3[22]
P3[23]
P3[24]
P3[25]
P3[26]
P3[27]
P3[28]
P3[29]
P3[30]
P3[31]
GPIO Port 3.16 D16
GPIO Port 3.17 D17
GPIO Port 3.18 D18
GPIO Port 3.19 D19
GPIO Port 3.20 D20
GPIO Port 3.21 D21
GPIO Port 3.22 D22
GPIO Port 3.23 D23
GPIO Port 3.24 D24
GPIO Port 3.25 D25
GPIO Port 3.26 D26
GPIO Port 3.27 D27
GPIO Port 3.28 D28
GPIO Port 3.29 D29
GPIO Port 3.30 D30
GPIO Port 3.31 D31
PWM0[1]
PWM0[2]
PWM0[3]
PWM0[4]
PWM0[5]
PWM0[6]
PCAP0[0]
CAP0[0]
CAP0[1]
MAT0[0]
MAT0[1]
CAP1[0]
CAP1[1]
MAT1[0]
MAT1[1]
MAT1[2]
TXD1
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
3:2
RXD1
5:4
CTS1
7:6
DCD1
9:8
DSR1
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
27:26
29:28
31:30
DR1
RI1
PCAP1[0]
PWM1[1]
PWM1[2]
PWM1[3]
PWM1[4]
PWM1[5]
PWM1[6]
RTS1
Reserved
5.9 Pin Function Select Register 8 (PINSEL8 - 0xE002 C020)
The PINSEL8 register controls the functions of the pins as per the settings listed in
GPIO function is selected for a pin. For other functions, direction is controlled
automatically.
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Table 141. Pin function select register 8 (PINSEL8 - address 0xE002 C020) bit description
PINSEL8 Pin
name
Function
when 00
Function
when 01
Function
when 10
Function
when 11
Reset
value
1:0
P4[0]
P4[1]
P4[2]
P4[3]
P4[4]
P4[5]
P4[6]
P4[7]
P4[8]
P4[9]
P4[10]
P4[11]
P4[12]
P4[13]
P4[14]
P4[15]
GPIO Port 4.0 A0
GPIO Port 4.1 A1
GPIO Port 4.2 A2
GPIO Port 4.3 A3
GPIO Port 4.4 A4
GPIO Port 4.5 A5
GPIO Port 4.6 A6
GPIO Port 4.7 A7
GPIO Port 4.8 A8
GPIO Port 4.9 A9
GPIO Port 4.10 A10
GPIO Port 4.11 A11
GPIO Port 4.12 A12
GPIO Port 4.13 A13
GPIO Port 4.14 A14
GPIO Port 4.15 A15
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
3:2
5:4
7:6
9:8
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
27:26
29:28
31:30
5.10 Pin Function Select Register 9 (PINSEL9 - 0xE002 C024)
The PINSEL9 register controls the functions of the pins as per the settings listed in
GPIO function is selected for a pin. For other functions, direction is controlled
automatically.
The bit functions in this register depend on the number of pins of each LPC2400 part. For
Table 142. LPC2458 pin function select register 9 (PINSEL9 - address 0xE002 C024) bit
description
PINSEL9 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
1:0
P4[16]
P4[17]
P4[18]
P4[19]
P4[20]
P4[21]
P4[22]
P4[23]
P4[24]
P4[25]
GPIO Port 4.16 A16
GPIO Port 4.17 A17
GPIO Port 4.18 A18
GPIO Port 4.19 A19
GPIO Port 4.20 A20
Reserved
Reserved
Reserved
Reserved
SDA2
Reserved
Reserved
Reserved
Reserved
SCK1
00
00
00
00
00
00
00
00
00
00
3:2
5:4
7:6
9:8
11:10
13:12
15:14
17:16
19:18
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
GPIO Port 4.24 OE
GPIO Port 4.25 WE
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Table 142. LPC2458 pin function select register 9 (PINSEL9 - address 0xE002 C024) bit
description
PINSEL9 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
21:20
23:22
25:24
27:26
29:28
31:30
P4[26]
P4[27]
P4[28]
P4[29]
P4[30]
P4[31]
GPIO Port 4.26 BLS0
GPIO Port 4.27 BLS1
GPIO Port 4.28 Reserved
GPIO Port 4.29 Reserved
GPIO Port 4.30 CS0
GPIO Port 4.31 CS1
Reserved
Reserved
MAT2[0]
Reserved
Reserved
TXD3
00
00
00
00
00
00
MAT2[1]
RXD3
Reserved
Reserved
Reserved
Reserved
Table 143. LPC2420/60/68/70/78 pin function select register 9 (PINSEL9 - address
0xE002 C024) bit description
PINSEL9 Pin
name
Function when Function
00 when 01
Function
when 10
Function
when 11
Reset
value
1:0
P4[16]
P4[17]
P4[18]
P4[19]
P4[20]
P4[21]
P4[22]
P4[23]
P4[24]
P4[25]
P4[26]
P4[27]
P4[28]
GPIO Port 4.16 A16
GPIO Port 4.17 A17
GPIO Port 4.18 A18
GPIO Port 4.19 A19
GPIO Port 4.20 A20
GPIO Port 4.21 A21
GPIO Port 4.22 A22
GPIO Port 4.23 A23
GPIO Port 4.24 OE
GPIO Port 4.25 WE
GPIO Port 4.26 BLS0
GPIO Port 4.27 BLS1
GPIO Port 4.28 BLS2
Reserved
Reserved
Reserved
Reserved
SDA2
Reserved
Reserved
Reserved
Reserved
SCK1
00
00
00
00
00
00
00
00
00
00
00
00
00
3:2
5:4
7:6
9:8
11:10
13:12
15:14
17:16
19:18
21:20
23:22
25:24
SCL2
SSEL1
TXD2
MISO1
RXD2
MOSI1
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
TXD3
MAT2[0]/
LCDVD[6]/
LCDVD[10]/
LCDVD[2]
27:26
P4[29]
GPIO Port 4.29 BLS3
MAT2[1]/
RXD3
00
LCDVD[7]/
LCDVD[11]/
LCDVD[3]
29:28
31:30
P4[30]
P4[31]
GPIO Port 4.30 CS0
GPIO Port 4.31 CS1
Reserved
Reserved
Reserved
Reserved
00
00
5.11 Pin Function Select Register 10 (PINSEL10 - 0xE002 C028)
Only bit 3 of this register is used to control the ETM interface pins.
The value of the RTCK I/O pin is sampled when the external reset is asserted. When
RTCK pin is low during external reset, bit 3 in PINSEL10 is set to enable the ETM
interface pins. When RTCK pin is high during external reset, bit 3 in PINSEL10 is cleared
to disable the ETM interface pins.
The ETM interface control pin can also be modified by the software.
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Table 144. Pin function select register 10 (PINSEL10 - address 0xE002 C028) bit description
Bit
Symbol
Value Description
Reset
value
2:0
3
-
-
Reserved. Software should not write 1 to these bits. NA
GPIO/TRACE
ETM interface pins control.
ETM interface is disabled.
RTCK, see
the text
above
0
1
ETM interface is enabled. ETM signals are available
on the pins hosting them regardless of the PINSEL4
content.
31:4
-
-
Reserved. Software should not write 1 to these bits. NA
5.12 Pin Function Select Register 11 (PINSEL11 - 0xE002 C02C)
This register is used to select the LCD function and the LCD mode on the LPC247x.
Table 145. Pin function select register 11 (PINSEL11 - address 0xE002 C02C) bit description
Bit
Symbol
Value Description
Reset
value
0
LCDPE
LCD Port Enable
0
0
1
LCD port is disabled.
LCD port is enabled.
LCD Mode
3:1
LCDM[2:0]
000
000
001
4-bit mono STN single panel.
8-bit mono STN single panel or color STN single
panel.
010
011
100
101
110
111
-
4-bit mono STN dual panel.
Color STN dual panel or 8-bit mono STN dual panel.
TFT 12-bit (4:4:4 mode)
TFT 16-bit (5:6:5 mode)
TFT 16-bit (1:5:5:5 mode)
TFT 24-bit.
31:4
-
Reserved. Software should not write 1 to these bits. NA
5.13 Pin Mode select register 0 (PINMODE0 - 0xE002 C040)
This register controls pull-up/pull-down resistor configuration for PORT0 pins 0 to 15.
Table 146. Pin Mode select register 0 (PINMODE0 - address 0xE002 C040) bit description
PINMODE0 Symbol
Value Description
Reset
value
1:0
P0.00MODE
PORT0 pin 0 on-chip pull-up/down resistor control. 00
00
01
10
11
P0.00 pin has a pull-up resistor enabled.
Reserved. This value should not be used.
P0.00 pin has neither pull-up nor pull-down.
P0.00 has a pull-down resistor enabled.
...
31:30
P0.15MODE
PORT0 pin 15 on-chip pull-up/down resistor control. 00
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5.14 Pin Mode select register 1 (PINMODE1 - 0xE002 C044)
This register controls pull-up/pull-down resistor configuration for PORT0 pins 16 to 26. For
Table 147. Pin Mode select register 1 (PINMODE1 - address 0xE002 C044) bit description
PINMODE1 Symbol
Description
Reset
value
1:0
P0.16MODE PORT0 pin 16 on-chip pull-up/down resistor control.
00
...
21:20
31:21
P0.26MODE PORT0 pin 26 on-chip pull-up/down resistor control.
00
-
Reserved
Remark: Pins P0.27 and P0.28 are dedicated I2C open drain pins without pull-up/down.
Pins P0.29, P0.30, P0.31 are USB specific pins without configurable pull-up or pull-down
resistors.
5.15 Pin Mode select register 2 (PINMODE2 - 0xE002 C048)
This register controls pull-up/pull-down resistor configuration for PORT1 pins 0 to 15. For
Table 148. Pin Mode select register 2 (PINMODE2 - address 0xE002 C048) bit description
PINMODE2 Symbol
Description
Reset
value
1:0
P1.00MODE PORT1 pin 0 on-chip pull-up/down resistor control.
P1.15MODE PORT1 pin 15 on-chip pull-up/down resistor control.
00
...
31:30
00
5.16 Pin Mode select register 3 (PINMODE3 - 0xE002 C04C)
This register controls pull-up/pull-down resistor configuration for PORT1 pins 16 to 31. For
Table 149. Pin Mode select register 3 (PINMODE3 - address 0xE002 C04C) bit description
PINMODE3 Symbol
Description
Reset
value
1:0
P1.16MODE PORT1 pin 16 on-chip pull-up/down resistor control.
P1.31MODE PORT1 pin 31 on-chip pull-up/down resistor control.
00
...
31:30
00
5.17 Pin Mode select register 4 (PINMODE4 - 0xE002 C050)
This register controls pull-up/pull-down resistor configuration for PORT2 pins 0 to 15. For
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Table 150. Pin Mode select register 4 (PINMODE4 - address 0xE002 C050) bit description
PINMODE4 Symbol
Description
Reset
value
1:0
P2.00MODE PORT2 pin 0 on-chip pull-up/down resistor control.
P2.15MODE PORT2 pin 15 on-chip pull-up/down resistor control.
00
...
31:30
00
5.18 Pin Mode select register 5 (PINMODE5 - 0xE002 C054)
This register controls pull-up/pull-down resistor configuration for PORT2 pins 16 to 31. For
Table 151. Pin Mode select register 5 (PINMODE5 - address 0xE002 C054) bit description
PINMODE5 Symbol
Description
Reset
value
1:0
P2.16MODE PORT2 pin 16 on-chip pull-up/down resistor control.
P2.31MODE PORT2 pin 31 on-chip pull-up/down resistor control.
00
...
31:30
00
5.19 Pin Mode select register 6 (PINMODE6 - 0xE002 C058)
This register controls pull-up/pull-down resistor configuration for PORT3 pins 0 to 15. For
Table 152. Pin Mode select register 6 (PINMODE6 - address 0xE002 C058) bit description
PINMODE6 Symbol
Description
Reset
value
1:0
P3.00MODE
PORT3 pin 0 on-chip pull-up/down resistor control.
00
...
31:30
P3.15MODE
PORT3 pin 15 on-chip pull-up/down resistor control.
00
5.20 Pin Mode select register 7 (PINMODE7 - 0xE002 C05C)
This register controls pull-up/pull-down resistor configuration for PORT3 pins 16 to 31. For
Table 153. Pin Mode select register 7 (PINMODE7 - address 0xE002 C05C) bit description
PINMODE7 Symbol
Description
Reset
value
1:0
P3.16MODE PORT3 pin 16 on-chip pull-up/down resistor control.
P3.31MODE PORT3 pin 31 on-chip pull-up/down resistor control.
00
...
31:30
00
5.21 Pin Mode select register 8 (PINMODE8 - 0xE002 C060)
This register controls pull-up/pull-down resistor configuration for PORT4 pins 0 to 15. For
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Table 154. Pin Mode select register 8 (PINMODE8 - address 0xE002 C060) bit description
PINMODE8 Symbol
Description
Reset
value
1:0
P4.00MODE
PORT4 pin 0 on-chip pull-up/down resistor control.
00
...
31:30
P4.15MODE
PORT4 pin 15 on-chip pull-up/down resistor control.
00
5.22 Pin Mode select register 9 (PINMODE9 - 0xE002 C064)
This register controls pull-up/pull-down resistor configuration for PORT4 pins 16 to 31. For
Table 155. Pin Mode select register 9 (PINMODE9 - address 0xE002 C064) bit description
PINMODE9 Symbol
Description
Reset
value
1:0
P4.16MODE PORT4 pin 16 on-chip pull-up/down resistor control.
P4.31MODE PORT4 pin 31 on-chip pull-up/down resistor control.
00
...
31:30
00
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User manual
1. How to read this chapter
The number of GPIO pins on each port is different for LPC2458 and LPC2460/68/70/78
unavailable pins are reserved in all GPIO related registers.
Table 156. LPC2400 available port pins
Port0
Port1
Port2
Port3
Port4
Features
LPC2458
Fast/Legacy Fast/Legacy Fast only
Fast only
Fast only
selectable
selectable
P1[31:0]
Interrupt
enabled
Interrupt
enabled
P0[31:0]
P2[13:0]
P2[21:16]
P2[25:24]
P2[29:28]
P2[31:0]
P3[15:0]
P4[19:0]
P3[26:23]
P4[31:24]
LPC2420/60/68/70/78
P0[31:0]
P1[31:0]
P3[31:0]
P4[31:0]
2. Basic configuration
GPIOs are configured using the following registers:
1. Power: always enabled.
3. Pins: Select GPIO pins and their modes in PINSEL0 to PINSEL10 and PINMODE0 to
wakeup if needed.
3. Features
3.1 Digital I/O ports
• GPIO PORT0 and PORT1 are ports accessible via either the group of registers
providing enhanced features and accelerated port access or the legacy group of
registers. PORT2/3/4 are accessed as fast ports only.
• Accelerated GPIO functions:
– GPIO registers are relocated to the ARM local bus so that the fastest possible I/O
timing can be achieved.
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– Mask registers allow treating sets of port bits as a group, leaving other bits
unchanged.
– All GPIO registers are byte and half-word addressable.
– Entire port value can be written in one instruction.
• Bit-level set and clear registers allow a single instruction set or clear of any number of
bits in one port.
• Direction control of individual bits.
• All I/O default to inputs after reset.
• Backward compatibility with other earlier devices is maintained with legacy registers
appearing at the original addresses on the APB bus.
3.2 Interrupt generating digital ports
• PORT0 and PORT2 provide an interrupt for each port pin.
• Each port pin can be programmed to generate an interrupt on a rising edge, a falling
edge, or both.
• Edge detection is asynchronous, so it may operate when clocks are not present, such
as during Power-down mode. With this feature, level triggered interrupts are not
needed.
• Each enabled interrupt contributes to a Wakeup signal that can be used to bring the
part out of Power Down mode.
• Registers provide a software view of pending rising edge interrupts, pending falling
edge interrupts, and overall pending GPIO interrupts.
• GPIO0 and GPIO2 interrupts share the same VIC slot with the External Interrupt 3
event.
4. Applications
• General purpose I/O
• Driving LEDs or other indicators
• Controlling off-chip devices
• Sensing digital inputs, detecting edges
• Bringing the part out of Power Down mode
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Chapter 10: LPC24XX General Purpose Input/Output (GPIO)
5. Pin description
Table 157. GPIO pin description
Pin Name
Type
Description
P0[31:0]
P1[31:0]
P2[31:0]
P3[31:0]
P4[31:0]
Input/
Output
General purpose input/output. These are typically shared with other
peripherals functions and will therefore not all be available in an
application. Packaging options may affect the number of GPIOs
available in a particular device.
Some pins may be limited by requirements of the alternate functions of
the pin. For example, the pins containing the I2C0 functions are
open-drain for any function selected on that pin. Details may be found
6. Register description
LPC2400 has up to five 32-bit General Purpose I/O ports. PORT0 and PORT1 are
from them, LPC2400 can have three additional 32-bit ports, PORT2, PORT3 and PORT4.
Details on a specific GPIO port usage can be found in the chapters "Pin Configuration"
and "Pin Connect Block".
devices, using existing code. The functions and relative timing of older GPIO
implementations is preserved. Only PORT0 and PORT1 can be controlled via the legacy
port registers.
the LPC2400’s GPIO ports. These registers are located directly on the local bus of the
CPU for the fastest possible read and write timing. They can be accessed as byte or
half-word long data, too. A mask register allows access to a group of bits in a single GPIO
port independently from other bits in the same port.
When PORT0 and PORT1 are used, user must select whether these ports will be
accessed via registers that provide enhanced features or a legacy set of registers (see
Section 3–3.3 “Other system controls and status flags” on page 35). While both of a port’s
fast and legacy GPIO registers are controlling the same physical pins, these two port
control branches are mutually exclusive and operate independently. For example,
changing a pin’s output via a fast register will not be observable via the corresponding
legacy register.
The following text will refer to the legacy GPIO as "the slow" GPIO, while GPIO equipped
with the enhanced features will be referred as "the fast" GPIO.
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Table 158. Summary of GPIO registers (legacy APB accessible registers)
Generic Description
Name
Access Reset
PORTn Register
IOPIN
GPIO Port Pin value register. The current state of the GPIO
configured port pins can always be read from this register,
regardless of pin direction. By writing to this register port’s pins will
be set to the desired level instantaneously.
R/W
R/W
R/W
NA
IO0PIN - 0xE002 8000
IO1PIN - 0xE002 8010
IOSET
GPIO Port Output Set register. This register controls the state of
output pins in conjunction with the IOCLR register. Writing ones
produces highs at the corresponding port pins. Writing zeroes has
no effect.
0x0
IO0SET - 0xE002 8004
IO1SET - 0xE002 8014
IODIR
GPIO Port Direction control register. This register individually
controls the direction of each port pin.
0x0
0x0
IO0DIR - 0xE002 8008
IO1DIR - 0xE002 8018
IOCLR
GPIO Port Output Clear register. This register controls the state of WO
output pins. Writing ones produces lows at the corresponding port
pins and clears the corresponding bits in the IOSET register.
Writing zeroes has no effect.
IO0CLR - 0xE002 800C
IO1CLR - 0xE002 801C
[1] Reset value reflects the data stored in used bits only. It does not include reserved bits content.
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Table 159. Summary of GPIO registers (local bus accessible registers - enhanced GPIO features)
Generic
Name
Description
Access Reset
PORTn Register
FIODIR
Fast GPIO Port Direction control register. This register
individually controls the direction of each port pin.
R/W
0x0
0x0
0x0
FIO0DIR - 0x3FFF C000
FIO1DIR - 0x3FFF C020
FIO2DIR - 0x3FFF C040
FIO2DIR - 0x3FFF C060
FIO2DIR - 0x3FFF C080
FIOMASK Fast Mask register for port. Writes, sets, clears, and reads to R/W
port (done via writes to FIOPIN, FIOSET, and FIOCLR, and
reads of FIOPIN) alter or return only the bits enabled by zeros
in this register.
FIO0MASK - 0x3FFF C010
FIO1MASK - 0x3FFF C030
FIO2MASK - 0x3FFF C050
FIO3MASK - 0x3FFF C070
FIO4MASK - 0x3FFF C090
FIOPIN
Fast Port Pin value register using FIOMASK. The current state R/W
of digital port pins can be read from this register, regardless of
pin direction or alternate function selection (as long as pins are
not configured as an input to ADC). The value read is masked
by ANDing with inverted FIOMASK. Writing to this register
places corresponding values in all bits enabled by zeros in
FIOMASK.
FIO0PIN - 0x3FFF C014
FIO1PIN - 0x3FFF C034
FIO2PIN - 0x3FFF C054
FIO3PIN - 0x3FFF C074
FIO4PIN - 0x3FFF C094
Important: if a FIOPIN register is read, its bit(s) masked with 1
in the FIOMASK register will be set to 0 regardless of the
physical pin state.
FIOSET
FIOCLR
Fast Port Output Set register using FIOMASK. This register
controls the state of output pins. Writing 1s produces highs at
the corresponding port pins. Writing 0s has no effect. Reading
this register returns the current contents of the port output
register. Only bits enabled by 0 in FIOMASK can be altered.
R/W
0x0
0x0
FIO0SET - 0x3FFF C018
FIO1SET - 0x3FFF C038
FIO2SET - 0x3FFF C058
FIO3SET - 0x3FFF C078
FIO4SET - 0x3FFF C098
Fast Port Output Clear register using FIOMASK0. This register WO
controls the state of output pins. Writing 1s produces lows at
the corresponding port pins. Writing 0s has no effect. Only bits
enabled by 0 in FIOMASK0 can be altered.
FIO0CLR - 0x3FFF C01C
FIO1CLR - 0x3FFF C03C
FIO2CLR - 0x3FFF C05C
FIO3CLR - 0x3FFF C07C
FIO4CLR - 0x3FFF C09C
[1] Reset value reflects the data stored in used bits only. It does not include reserved bits content.
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Table 160. GPIO interrupt register map
Generic
Name
Description
Access Reset
PORTn Register
IntEnR
IntEnF
IntStatR
IntStatF
IntClr
GPIO Interrupt Enable for Rising edge.
GPIO Interrupt Enable for Falling edge.
GPIO Interrupt Status for Rising edge.
GPIO Interrupt Status for Falling edge.
GPIO Interrupt Clear.
R/W
R/W
RO
0x0
0x0
0x0
0x0
0x0
0x00
IO0IntEnR - 0xE002 8090
IO2IntEnR - 0xE002 80B0
IO0IntEnR - 0xE002 8094
IO2IntEnR - 0xE002 80B4
IO0IntStatR - 0xE002 8084
IO2IntStatR - 0xE002 80A4
RO
IO0IntStatF - 0xE002 8088
IO2IntStatF - 0xE002 80A8
WO
RO
IO0IntClr - 0xE002 808C
IO2IntClr - 0xE002 80AC
IntStatus
GPIO overall Interrupt Status.
IOIntStatus - 0xE002 8080
[1] Reset value reflects the data stored in used bits only. It does not include reserved bits content.
6.1 GPIO port Direction register IODIR and FIODIR(IO[0/1]DIR -
0xE002 80[0/1]8 and FIO[0/1/2/3/4]DIR - 0x3FFF C0[0/2/4/6/8]0)
This word accessible register is used to control the direction of the pins when they are
configured as GPIO port pins. Direction bit for any pin must be set according to the pin
functionality.
Remark: GPIO pins P0.29 and P0.30 are shared with the USB D+/− pins and must have
the same direction. If either P0DIR bits 29 or 30 are configured LOW in the IO0DIR or
FIO0DIR registers, both, P0.29 and P0.30, are inputs. If both, P0DIR bit 29 and bit 30 are
HIGH, both, P0.29 and P0.30, are outputs.
Legacy registers are the IO0DIR and IO1DIR while the enhanced GPIO functions are
supported via the FIO0DIR, FIO1DIR, FIO2DIR, FIO3DIR and FIO4DIR registers.
Table 161. GPIO port Direction register (IO0DIR - address 0xE002 8008 and IO1DIR - address
0xE002 8018) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xDIR
or
Slow GPIO Direction PORTx control bits. Bit 0 in IOxDIR
controls pin Px.0, bit 31 IOxDIR controls pin Px.31.
0x0
P1xDIR
0
1
Controlled pin is an input pin.
Controlled pin is an output pin.
Table 162. Fast GPIO port Direction register (FIO[0/1/2/3/4]DIR - address
0x3FFF C0[0/2/4/6/8]0) bit description
Bit
Symbol Value Description
Reset
value
31:0 FP0xDIR
FP1xDIR
Fast GPIO Direction PORTx control bits. Bit 0 in FIOxDIR
controls pin Px.0, bit 31 in FIOxDIR controls pin Px.31.
0x0
FP2xDIR
FP3xDIR
FP4xDIR
0
1
Controlled pin is input.
Controlled pin is output.
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Aside from the 32-bit long and word only accessible FIODIR register, every fast GPIO port
can also be controlled via several byte and half-word accessible registers listed in
additional registers allow easier and faster access to the physical port pins.
Table 163. Fast GPIO port Direction control byte and half-word accessible register
description
Generic
Register
name
Description
Register
length (bits) value
& access
Reset PORTn Register
Address & Name
FIOxDIR0 Fast GPIO Port x Direction
control register 0. Bit 0 in
8 (byte)
R/W
0x00
0x00
0x00
0x00
FIO0DIR0 - 0x3FFF C000
FIO1DIR0 - 0x3FFF C020
FIO2DIR0 - 0x3FFF C040
FIO3DIR0 - 0x3FFF C060
FIO4DIR0 - 0x3FFF C080
FIOxDIR0 register corresponds
to pin Px.0 ... bit 7 to pin Px.7.
FIOxDIR1 Fast GPIO Port x Direction
control register 1. Bit 0 in
8 (byte)
R/W
FIO0DIR1 - 0x3FFF C001
FIO1DIR1 - 0x3FFF C021
FIO2DIR1 - 0x3FFF C041
FIO3DIR1 - 0x3FFF C061
FIO4DIR1 - 0x3FFF C081
FIOxDIR1 register corresponds
to pin Px.8 ... bit 7 to pin Px.15.
FIO0DIR2 Fast GPIO Port x Direction
control register 2. Bit 0 in
FIOxDIR2 register corresponds
to pin Px.16 ... bit 7 to pin
Px.23.
8 (byte)
R/W
FIO0DIR2 - 0x3FFF C002
FIO1DIR2 - 0x3FFF C022
FIO2DIR2 - 0x3FFF C042
FIO3DIR2 - 0x3FFF C062
FIO4DIR2 - 0x3FFF C082
FIOxDIR3 Fast GPIO Port x Direction
control register 3. Bit 0 in
FIOxDIR3 register corresponds
to pin Px.24 ... bit 7 to pin
Px.31.
8 (byte)
R/W
FIO0DIR3 - 0x3FFF C003
FIO1DIR3 - 0x3FFF C023
FIO2DIR3 - 0x3FFF C043
FIO3DIR3 - 0x3FFF C063
FIO4DIR3 - 0x3FFF C083
FIOxDIRL Fast GPIO Port x Direction
control Lower half-word
16 (half-word) 0x0000 FIO0DIRL - 0x3FFF C000
R/W
FIO1DIRL - 0x3FFF C020
FIO2DIRL - 0x3FFF C040
FIO3DIRL - 0x3FFF C060
FIO4DIRL - 0x3FFF C080
register. Bit 0 in FIOxDIRL
register corresponds to pin
Px.0 ... bit 15 to pin Px.15.
FIOxDIRU Fast GPIO Port x Direction
control Upper half-word
16 (half-word) 0x0000 FIO0DIRU - 0x3FFF C002
R/W
FIO1DIRU - 0x3FFF C022
FIO2DIRU - 0x3FFF C042
FIO3DIRU - 0x3FFF C062
FIO4DIRU - 0x3FFF C082
register. Bit 0 in FIOxDIRU
register corresponds to Px.16
... bit 15 to Px.31.
6.2 GPIO port output Set register IOSET and FIOSET(IO[0/1]SET -
0xE002 80[0/1]4 and FIO[0/1/2/3/4]SET - 0x3FFF C0[1/3/5/7/9]8)
This register is used to produce a HIGH level output at the port pins configured as GPIO in
an OUTPUT mode. Writing 1 produces a HIGH level at the corresponding port pins.
Writing 0 has no effect. If any pin is configured as an input or a secondary function, writing
1 to the corresponding bit in the IOSET has no effect.
Reading the IOSET register returns the value of this register, as determined by previous
writes to IOSET and IOCLR (or IOPIN as noted above). This value does not reflect the
effect of any outside world influence on the I/O pins.
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Legacy registers are the IO0SET and IO1SET while the enhanced GPIOs are supported
via the FIO0SET, FIO1SET, FIO2SET, FIO3SET, and FIO4SET registers. Access to a port
pin via the FIOSET register is conditioned by the corresponding bit of the FIOMASK
register (see Section 10–6.5 “Fast GPIO port Mask register
Table 164. GPIO port output Set register (IO0SET - address 0xE002 8004 and IO1SET -
address 0xE002 8014) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xSET
or
Slow GPIO output value Set bits. Bit 0 in IOxSET controls pin
Px.0, bit 31 in IOxSET controls pin Px.31.
0x0
P1xSET
0
1
Controlled pin output is unchanged.
Controlled pin output is set to HIGH.
Table 165. Fast GPIO port output Set register (FIO[0/1/2/3/4]SET - address
0x3FFF C0[1/3/5/7/9]8) bit description
Bit
Symbol Value Description
Reset
value
31:0 FP0xSET
FP1xSET
Fast GPIO output value Set bits. Bit 0 in FIOxSET controls pin
Px.0, bit 31 in FIOxSET controls pin Px.31.
0x0
FP2xSET
FP3xSET
FP4xSET
0
1
Controlled pin output is unchanged.
Controlled pin output is set to HIGH.
Aside from the 32-bit long and word only accessible FIOSET register, every fast GPIO
port can also be controlled via several byte and half-word accessible registers listed in
additional registers allow easier and faster access to the physical port pins.
Table 166. Fast GPIO port output Set byte and half-word accessible register description
Generic
Register
name
Description
Register
length (bits) value
& access
Reset PORTn Register
Address & Name
FIOxSET0 Fast GPIO Port x output Set 8 (byte)
register 0. Bit 0 in FIOxSET0 R/W
register corresponds to pin
0x00
0x00
0x00
FIO0SET0 - 0x3FFF C018
FIO1SET0 - 0x3FFF C038
FIO2SET0 - 0x3FFF C058
FIO3SET0 - 0x3FFF C078
FIO4SET0 - 0x3FFF C098
Px.0 ... bit 7 to pin Px.7.
FIOxSET1 Fast GPIO Port x output Set 8 (byte)
register 1. Bit 0 in FIOxSET1 R/W
register corresponds to pin
FIO0SET1 - 0x3FFF C019
FIO1SET1 - 0x3FFF C039
FIO2SET1 - 0x3FFF C059
FIO3SET1 - 0x3FFF C079
FIO4SET1 - 0x3FFF C099
Px.8 ... bit 7 to pin Px.15.
FIOxSET2 Fast GPIO Port x output Set 8 (byte)
register 2. Bit 0 in FIOxSET2 R/W
register corresponds to pin
FIO0SET2 - 0x3FFF C01A
FIO1SET2 - 0x3FFF C03A
FIO2SET2 - 0x3FFF C05A
FIO3SET2 - 0x3FFF C07A
FIO4SET2 - 0x3FFF C09A
Px.16 ... bit 7 to pin Px.23.
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Table 166. Fast GPIO port output Set byte and half-word accessible register description
Generic
Register
name
Description
Register
length (bits) value
& access
Reset PORTn Register
Address & Name
FIOxSET3 Fast GPIO Port x output Set 8 (byte)
register 3. Bit 0 in FIOxSET3 R/W
register corresponds to pin
0x00
FIO0SET3 - 0x3FFF C01B
FIO1SET3 - 0x3FFF C03B
FIO2SET3 - 0x3FFF C05B
FIO3SET3 - 0x3FFF C07B
FIO4SET3 - 0x3FFF C09B
Px.24 ... bit 7 to pin Px.31.
FIOxSETL Fast GPIO Port x output Set 16 (half-word) 0x0000 FIO0SETL - 0x3FFF C018
Lower half-word register. Bit 0 R/W
in FIOxSETL register
corresponds to pin Px.0 ... bit
15 to pin Px.15.
FIO1SETL - 0x3FFF C038
FIO2SETL - 0x3FFF C058
FIO3SETL - 0x3FFF C078
FIO4SETL - 0x3FFF C098
FIOxSETU Fast GPIO Port x output Set 16 (half-word) 0x0000 FIO0SETU - 0x3FFF C01A
Upper half-word register. Bit 0 R/W
in FIOxSETU register
corresponds to Px.16 ... bit
15 to Px.31.
FIO1SETU - 0x3FFF C03A
FIO2SETU - 0x3FFF C05A
FIO3SETU - 0x3FFF C07A
FIO4SETU - 0x3FFF C09A
6.3 GPIO port output Clear register IOCLR and FIOCLR (IO[0/1]CLR -
0xE002 80[0/1]C and FIO[0/1/2/3/4]CLR - 0x3FFF C0[1/3/5/7/9]C)
This register is used to produce a LOW level output at port pins configured as GPIO in an
OUTPUT mode. Writing 1 produces a LOW level at the corresponding port pin and clears
the corresponding bit in the IOSET register. Writing 0 has no effect. If any pin is configured
as an input or a secondary function, writing to IOCLR has no effect.
Legacy registers are the IO0CLR and IO1CLR while the enhanced GPIOs are supported
via the FIO0CLR, FIO1CLR, FIO2CLR, FIO3CLR, and FIO4CLR registers. Access to a
port pin via the FIOCLR register is conditioned by the corresponding bit of the FIOMASK
register (see Section 10–6.5 “Fast GPIO port Mask register
Table 167. GPIO port output Clear register (IO0CLR - address 0xE002 800C and IO1CLR -
address 0xE002 801C) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xCLR
or
Slow GPIO output value Clear bits. Bit 0 in IOxCLR controls pin 0x0
Px.0, bit 31 in IOxCLR controls pin Px.31.
Controlled pin output is unchanged.
Controlled pin output is set to LOW.
P1xCLR
0
1
Table 168. Fast GPIO port output Clear register (FIO[0/1/2/3/4]CLR - address
0x3FFF C0[1/3/5/7/9]C) bit description
Bit
Symbol Value Description
Reset
value
31:0 FP0xCLR
FP1xCLR
Fast GPIO output value Clear bits. Bit 0 in FIOxCLR controls pin 0x0
Px.0, bit 31 controls pin Px.31.
FP2xCLR
FP3xCLR
FP4xCLR
0
1
Controlled pin output is unchanged.
Controlled pin output is set to LOW.
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Aside from the 32-bit long and word only accessible FIOCLR register, every fast GPIO
port can also be controlled via several byte and half-word accessible registers listed in
additional registers allow easier and faster access to the physical port pins.
Table 169. Fast GPIO port output Clear byte and half-word accessible register description
Generic
Register
name
Description
Register
length (bits)
& access
Reset PORTn Register
value
Address & Name
FIOxCLR0 Fast GPIO Port x output
Clear register 0. Bit 0 in
FIOxCLR0 register
8 (byte)
WO
0x00
FIO0CLR0 - 0x3FFF C01C
FIO1CLR0 - 0x3FFF C03C
FIO2CLR0 - 0x3FFF C05C
FIO3CLR0 - 0x3FFF C07C
FIO4CLR0 - 0x3FFF C09C
corresponds to pin Px.0 ... bit
7 to pin Px.7.
FIOxCLR1 Fast GPIO Port x output
Clear register 1. Bit 0 in
FIOxCLR1 register
8 (byte)
WO
0x00
0x00
0x00
FIO0CLR1 - 0x3FFF C01D
FIO1CLR1 - 0x3FFF C03D
FIO2CLR1 - 0x3FFF C05D
FIO3CLR1 - 0x3FFF C07D
FIO4CLR1 - 0x3FFF C09D
corresponds to pin Px.8 ... bit
7 to pin Px.15.
FIOxCLR2 Fast GPIO Port x output
Clear register 2. Bit 0 in
FIOxCLR2 register
8 (byte)
WO
FIO0CLR2 - 0x3FFF C01E
FIO1CLR2 - 0x3FFF C03E
FIO2CLR2 - 0x3FFF C05E
FIO3CLR2 - 0x3FFF C07E
FIO4CLR2 - 0x3FFF C09E
corresponds to pin Px.16 ...
bit 7 to pin Px.23.
FIOxCLR3 Fast GPIO Port x output
Clear register 3. Bit 0 in
FIOxCLR3 register
8 (byte)
WO
FIO0CLR3 - 0x3FFF C01F
FIO1CLR3 - 0x3FFF C03F
FIO2CLR3 - 0x3FFF C05F
FIO3CLR3 - 0x3FFF C07F
FIO4CLR3 - 0x3FFF C09F
corresponds to pin Px.24 ...
bit 7 to pin Px.31.
FIOxCLRL Fast GPIO Port x output
Clear Lower half-word
16 (half-word) 0x0000 FIO0CLRL - 0x3FFF C01C
WO
FIO1CLRL - 0x3FFF C03C
FIO2CLRL - 0x3FFF C05C
FIO3CLRL - 0x3FFF C07C
FIO4CLRL - 0x3FFF C09C
register. Bit 0 in FIOxCLRL
register corresponds to pin
Px.0 ... bit 15 to pin Px.15.
FIOxCLRU Fast GPIO Port x output
Clear Upper half-word
16 (half-word) 0x0000 FIO0CLRU - 0x3FFF C01E
WO
FIO1CLRU - 0x3FFF C03E
FIO2CLRU - 0x3FFF C05E
FIO3CLRU - 0x3FFF C07E
FIO4CLRU - 0x3FFF C09E
register. Bit 0 in FIOxCLRU
register corresponds to pin
Px.16 ... bit 15 to Px.31.
6.4 GPIO port Pin value register IOPIN and FIOPIN (IO[0/1]PIN -
0xE002 80[0/1]0 and FIO[0/1/2/3/4]PIN - 0x3FFF C0[1/3/5/7/9]4)
This register provides the value of port pins that are configured to perform only digital
functions. The register will give the logic value of the pin regardless of whether the pin is
configured for input or output, or as GPIO or an alternate digital function. As an example,
a particular port pin may have GPIO input, GPIO output, UART receive, and PWM output
as selectable functions. Any configuration of that pin will allow its current logic state to be
read from the corresponding IOPIN register.
If a pin has an analog function as one of its options, the pin state cannot be read if the
analog configuration is selected. Selecting the pin as an A/D input disconnects the digital
features of the pin. In that case, the pin value read in the IOPIN register is not valid.
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Writing to the IOPIN register stores the value in the port output register, bypassing the
need to use both the IOSET and IOCLR registers to obtain the entire written value. This
feature should be used carefully in an application since it affects the entire port.
Legacy registers are the IO0PIN and IO1PIN while the enhanced GPIOs are supported
via the FIO0PIN, FIO1PIN, FIO2PIN, FIO3PIN and FIO4PIN registers. Access to a port
pin via the FIOPIN register is conditioned by the corresponding bit of the FIOMASK
register (see Section 10–6.5 “Fast GPIO port Mask register
Only pins masked with zeros in the Mask register (see Section 10–6.5 “Fast GPIO port
correlated to the current content of the Fast GPIO port pin value register.
Table 170. GPIO port Pin value register (IO0PIN - address 0xE002 8000 and IO1PIN - address
0xE002 8010) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xVAL
or
Slow GPIO pin value bits. Bit 0 in IOxPIN corresponds to pin
Px.0, bit 31 in IOxPIN corresponds to pin Px.31.
0x0
P1xVAL
0
1
Controlled pin output is set to LOW.
Controlled pin output is set to HIGH.
Table 171. Fast GPIO port Pin value register (FIO[0/1/2/3/4]PIN - address
0x3FFF C0[1/3/5/7/9]4) bit description
Bit
Symbol Value Description
Reset
value
31:0 FP0xVAL
FP1xVAL
Fast GPIO output value Set bits. Bit 0 in FIOxCLR corresponds 0x0
to pin Px.0, bit 31 in FIOxCLR corresponds to pin Px.31.
FP2xVAL
FP3xVAL
FP4xVAL
0
1
Controlled pin output is set to LOW.
Controlled pin output is set to HIGH.
Aside from the 32-bit long and word only accessible FIOPIN register, every fast GPIO port
can also be controlled via several byte and half-word accessible registers listed in
additional registers allow easier and faster access to the physical port pins.
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Table 172. Fast GPIO port Pin value byte and half-word accessible register description
Generic
Register
name
Description
Register
length (bits) value
& access
Reset PORTn Register
Address & Name
FIOxPIN0 Fast GPIO Port x Pin value
register 0. Bit 0 in FIOxPIN0
register corresponds to pin
8 (byte)
R/W
0x00
0x00
0x00
0x00
FIO0PIN0 - 0x3FFF C014
FIO1PIN0 - 0x3FFF C034
FIO2PIN0 - 0x3FFF C054
FIO3PIN0 - 0x3FFF C074
FIO4PIN0 - 0x3FFF C094
Px.0 ... bit 7 to pin Px.7.
FIOxPIN1 Fast GPIO Port x Pin value
register 1. Bit 0 in FIOxPIN1
register corresponds to pin
8 (byte)
R/W
FIO0PIN1 - 0x3FFF C015
FIO1PIN1 - 0x3FFF C035
FIO2PIN1 - 0x3FFF C055
FIO3PIN1 - 0x3FFF C075
FIO4PIN1 - 0x3FFF C095
Px.8 ... bit 7 to pin Px.15.
FIOxPIN2 Fast GPIO Port x Pin value
register 2. Bit 0 in FIOxPIN2
register corresponds to pin
8 (byte)
R/W
FIO0PIN2 - 0x3FFF C016
FIO1PIN2 - 0x3FFF C036
FIO2PIN2 - 0x3FFF C056
FIO3PIN2 - 0x3FFF C076
FIO4PIN2 - 0x3FFF C096
Px.16 ... bit 7 to pin Px.23.
FIOxPIN3 Fast GPIO Port x Pin value
register 3. Bit 0 in FIOxPIN3
register corresponds to pin
8 (byte)
R/W
FIO0PIN3 - 0x3FFF C017
FIO1PIN3 - 0x3FFF C037
FIO2PIN3 - 0x3FFF C057
FIO3PIN3 - 0x3FFF C077
FIO4PIN3 - 0x3FFF C097
Px.24 ... bit 7 to pin Px.31.
FIOxPINL Fast GPIO Port x Pin value
16 (half-word) 0x0000 FIO0PINL - 0x3FFF C014
Lower half-word register. Bit 0 R/W
in FIOxPINL register
corresponds to pin Px.0 ... bit
15 to pin Px.15.
FIO1PINL - 0x3FFF C034
FIO2PINL - 0x3FFF C054
FIO3PINL - 0x3FFF C074
FIO4PINL - 0x3FFF C094
FIOxPINU Fast GPIO Port x Pin value
16 (half-word) 0x0000 FIO0PINU - 0x3FFF C016
Upper half-word register. Bit 0 R/W
FIO1PINU - 0x3FFF C036
FIO2PINU - 0x3FFF C056
FIO3PINU - 0x3FFF C076
FIO4PINU - 0x3FFF C096
in FIOxPINU register
corresponds to pin Px.16 ... bit
15 to Px.31.
6.5 Fast GPIO port Mask register FIOMASK(FIO[0/1/2/3/4]MASK -
0x3FFF C0[1/3/5/7/9]0)
This register is available in the enhanced group of registers only. It is used to select port
pins that will and will not be affected by write accesses to the FIOPIN, FIOSET or FIOCLR
register. Mask register also filters out port’s content when the FIOPIN register is read.
A zero in this register’s bit enables an access to the corresponding physical pin via a read
or write access. If a bit in this register is one, corresponding pin will not be changed with
write access and if read, will not be reflected in the updated FIOPIN register. For software
examples, see Section 10–7 “GPIO usage notes” on page 208
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Table 173. Fast GPIO port Mask register (FIO[0/1/2/3/4]MASK - address
0x3FFF C0[1/3/5/7/9]0) bit description
Bit Symbol Value Description
Reset
value
31:0 FP0xMASK,
FP1xMASK,
FP2xMASK,
FP3xMASK
Fast GPIO physical pin access control.
0x0
0
1
Controlled pin is affected by writes to the port’s FIOSET,
FIOCLR, and FIOPIN register(s). Current state of the pin can
be read from the FIOPIN register.
FP4xMASK
Controlled pin is not affected by writes into the port’s
FIOSET, FIOCLR and FIOPIN register(s). When the FIOPIN
register is read, this bit will not be updated with the state of
the physical pin.
Aside from the 32-bit long and word only accessible FIOMASK register, every fast GPIO
port can also be controlled via several byte and half-word accessible registers listed in
additional registers allow easier and faster access to the physical port pins.
Table 174. Fast GPIO port Mask byte and half-word accessible register description
Generic
Register
name
Description
Register
Reset PORTn Register
length (bits) value Address & Name
& access
FIOxMASK0 Fast GPIO Port x Mask
register 0. Bit 0 in
8 (byte)
R/W
0x0
0x0
0x0
0x0
0x0
0x0
FIO0MASK0 - 0x3FFF C010
FIO1MASK0 - 0x3FFF C030
FIO2MASK0 - 0x3FFF C050
FIO3MASK0 - 0x3FFF C070
FIO4MASK0 - 0x3FFF C090
FIOxMASK0 register
corresponds to pin Px.0 ...
bit 7 to pin Px.7.
FIOxMASK1 Fast GPIO Port x Mask
register 1. Bit 0 in
8 (byte)
R/W
FIO0MASK1 - 0x3FFF C011
FIO1MASK1 - 0x3FFF C031
FIO2MASK1 - 0x3FFF C051
FIO3MASK1 - 0x3FFF C071
FIO4MASK1 - 0x3FFF C091
FIOxMASK1 register
corresponds to pin Px.8 ...
bit 7 to pin Px.15.
FIOxMASK2 Fast GPIO Port x Mask
register 2. Bit 0 in
8 (byte)
R/W
FIO0MASK2 - 0x3FFF C012
FIO1MASK2 - 0x3FFF C032
FIO2MASK2 - 0x3FFF C052
FIO3MASK2 - 0x3FFF C072
FIO4MASK2 - 0x3FFF C092
FIOxMASK2 register
corresponds to pin Px.16 ...
bit 7 to pin Px.23.
FIOxMASK3 Fast GPIO Port x Mask
register 3. Bit 0 in
8 (byte)
R/W
FIO0MASK3 - 0x3FFF C013
FIO1MASK3 - 0x3FFF C033
FIO2MASK3 - 0x3FFF C053
FIO3MASK3 - 0x3FFF C073
FIO4MASK3 - 0x3FFF C093
FIOxMASK3 register
corresponds to pin Px.24 ...
bit 7 to pin Px.31.
FIOxMASKL Fast GPIO Port x Mask
Lower half-word register.
16
FIO0MASKL - 0x3FFF C010
FIO1MASKL - 0x3FFF C030
FIO2MASKL - 0x3FFF C050
FIO3MASKL - 0x3FFF C070
FIO4MASKL - 0x3FFF C090
(half-word)
R/W
Bit 0 in FIOxMASKL
register corresponds to pin
Px.0 ... bit 15 to pin Px.15.
FIOxMASKU Fast GPIO Port x Mask
Upper half-word register.
Bit 0 in FIOxMASKU
16
FIO0MASKU - 0x3FFF C012
FIO1MASKU - 0x3FFF C032
FIO2MASKU - 0x3FFF C053
FIO3MASKU - 0x3FFF C072
FIO4MASKU - 0x3FFF C092
(half-word)
R/W
register corresponds to pin
Px.16 ... bit 15 to Px.31.
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6.6 GPIO interrupt registers
The following registers configure the pins of port 0 and port 2 to generate interrupts.
6.6.1 GPIO overall Interrupt Status register (IOIntStatus - 0xE002 8080)
This read-only register indicates the presence of interrupt pending on all of the GPIO ports
that support GPIO interrupts. Only one bit per port is used.
Table 175. GPIO overall Interrupt Status register (IOIntStatus - address 0xE002 8080) bit
description
Bit
Symbol Value Description
Reset
value
0
P0Int
PORT0 GPIO interrupt pending.
0
0
1
-
There are no pending interrupts on PORT0.
There is at least one pending interrupt on PORT0.
Reserved. The value read from a reserved bit is not defined.
PORT2 GPIO interrupt pending.
1
2
-
NA
0
P2Int
0
1
-
There are no pending interrupts on PORT2.
There is at least one pending interrupt on PORT2.
Reserved. The value read from a reserved bit is not defined.
31:2
-
NA
6.6.2 GPIO Interrupt Enable for Rising edge register (IO0IntEnR - 0xE002 8090
and IO2IntEnR - 0xE002 80B0)
Each bit in these read-write registers enables the rising edge interrupt for the
corresponding GPIO port pin.
Table 176. GPIO Interrupt Enable for Rising edge register (IO0IntEnR - address 0xE002 8090
and IO2IntEnR - address 0xE002 80B0) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xER
and
Enable Rising edge. Bit 0 in IOxIntEnR corresponds to pin Px.0,
bit 31 in IOxIntEnR corresponds to pin Px.31.
0
P2xER
0
1
Rising edge interrupt is disabled on the controlled pin.
Rising edge interrupt is enabled on the controlled pin.
6.6.3 GPIO Interrupt Enable for Falling edge register (IO0IntEnF - 0xE002 8094
and IO2IntEnF - 0xE002 80B4)
Each bit in these read-write registers enables the falling edge interrupt for the
corresponding GPIO port pin.
Table 177. GPIO Interrupt Enable for Falling edge register (IO0IntEnF - address 0xE002 8094
and IO2IntEnF - address 0xE002 80B4) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xEF
and
Enable Falling edge. Bit 0 in IOxIntEnF corresponds to pin Px.0,
bit 31 in IOxIntEnF corresponds to pin Px.31.
0
P2xEF
0
1
Falling edge interrupt is disabled on the controlled pin.
Falling edge interrupt is enabled on the controlled pin.
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6.6.4 GPIO Interrupt Status for Rising edge register (IO0IntStatR - 0xE002 8084
and IO2IntStatR - 0xE002 80A4)
Each bit in these read-only registers indicates the rising edge interrupt status for the
corresponding port.
Table 178. GPIO Status for Rising edge register (IO0IntStatR - address 0xE002 8084 and
IO2IntStatR - address 0xE002 80A4) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xREI
and
Rising Edge Interrupt status. Bit 0 in IOxIntStatR corresponds to
pin Px.0, bit 31 in IOxIntStatR corresponds to pin Px.31.
0
P2xREI
0
1
Rising edge has not been detected on the corresponding pin.
An interrupt is generated due to a rising edge on the
corresponding pin.
6.6.5 GPIO Interrupt Status for Falling edge register (IO0IntStatF - 0xE002 8088
and IO2IntStatF - 0xE002 80A8)
Each bit in these read-only registers indicates the rising edge interrupt status for the
corresponding port.
Table 179. GPIO Status for Falling edge register (IO0IntStatF - address 0xE002 8088 and
IO2IntStatF - address 0xE002 80A8) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xFEI
and
Falling Edge Interrupt status. Bit 0 in IOxIntStatF corresponds to
pin Px.0, bit 31 in IOxIntStatF corresponds to pin Px.31.
0
P2xFEI
0
1
Falling edge has not been detected on the corresponding pin.
An interrupt is generated due to a falling edge on the
corresponding pin.
6.6.6 GPIO Interrupt Clear register (IO0IntClr - 0xE002 808C and IO2IntClr -
0xE002 80AC)
Writing a 1 into each bit in these write-only registers clears any interrupts for the
corresponding GPIO port pin.
Table 180. GPIO Status for Falling edge register (IO0IntClr - address 0xE002 808C and
IO2IntClr - address 0xE002 80AC) bit description
Bit
Symbol Value Description
Reset
value
31:0 P0xCI
and
Clear GPIO port Interrupt. Bit 0 in IOxIntClr corresponds to pin
Px.0, bit 31 in IOxIntClr corresponds to pin Px.31.
0
P2xCI
0
1
Corresponding bit in IOxIntStatR and/or IOxIntStatF is
unchanged.
Corresponding bit in IOxIntStatR and IOxStatF is cleared to 0.
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Chapter 10: LPC24XX General Purpose Input/Output (GPIO)
7. GPIO usage notes
7.1 Example 1: sequential accesses to IOSET and IOCLR affecting the
same GPIO pin/bit
State of the output configured GPIO pin is determined by writes into the pin’s port IOSET
and IOCLR registers. Last of these accesses to the IOSET/IOCLR register will determine
the final output of a pin.
In the example code:
IO0DIR = 0x0000 0080 ;pin P0.7 configured as output
IO0CLR = 0x0000 0080 ;P0.7 goes LOW
IO0SET = 0x0000 0080 ;P0.7 goes HIGH
IO0CLR = 0x0000 0080 ;P0.7 goes LOW
pin P0.7 is configured as an output (write to IO0DIR register). After this, P0.7 output is set
to low (first write to IO0CLR register). Short high pulse follows on P0.7 (write access to
IO0SET), and the final write to IO0CLR register sets pin P0.7 back to low level.
7.2 Example 2: an instantaneous output of 0s and 1s on a GPIO port
Write access to port’s IOSET followed by write to the IOCLR register results with pins
outputting 0s being slightly later then pins outputting 1s. There are systems that can
tolerate this delay of a valid output, but for some applications simultaneous output of a
binary content (mixed 0s and 1s) within a group of pins on a single GPIO port is required.
This can be accomplished by writing to the port’s IOPIN register.
Following code will preserve existing output on PORT0 pins P0.[31:16] and P0.[7:0] and
at the same time set P0.[15:8] to 0xA5, regardless of the previous value of pins P0.[15:8]:
IO0PIN = (IO0PIN && 0xFFFF00FF) || 0x0000A500
The same outcome can be obtained using the fast port access.
Solution 1: using 32-bit (word) accessible fast GPIO registers
FIO0MASK = 0xFFFF00FF;
FIO0PIN = 0x0000A500;
Solution 2: using 16-bit (half-word) accessible fast GPIO registers
FIO0MASKL = 0x00FF;
FIO0PINL = 0xA500;
Solution 3: using 8-bit (byte) accessible fast GPIO registers
FIO0PIN1 = 0xA5;
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Chapter 10: LPC24XX General Purpose Input/Output (GPIO)
7.3 Writing to IOSET/IOCLR vs. IOPIN
Write to the IOSET/IOCLR register allows easy change of the port’s selected output pin(s)
to high/low level at a time. Only pin/bit(s) in the IOSET/IOCLR written with 1 will be set to
high/low level, while those written as 0 will remain unaffected. However, by just writing to
either IOSET or IOCLR register it is not possible to instantaneously output arbitrary binary
data containing a mixture of 0s and 1s on a GPIO port.
Write to the IOPIN register enables instantaneous output of a desired content on the
parallel GPIO. Binary data written into the IOPIN register will affect all output configured
pins of that parallel port: 0s in the IOPIN will produce low level pin outputs and 1s in IOPIN
will produce high level pin outputs. In order to change output of only a group of port’s pins,
application must logically AND readout from the IOPIN with mask containing 0s in bits
corresponding to pins that will be changed, and 1s for all others. Finally, this result has to
be logically ORred with the desired content and stored back into the IOPIN register.
Example 2 from above illustrates output of 0xA5 on PORT0 pins 15 to 8 while preserving
all other PORT0 output pins as they were before.
7.4 Output signal frequency considerations when using the legacy and
enhanced GPIO registers
The enhanced features of the fast GPIO ports available on this microcontroller make
GPIO pins more responsive to the code that has task of controlling them. In particular,
software access to a GPIO pin is 3.5 times faster via the fast GPIO registers than it is
when the legacy set of registers is used. As a result of the access speed increase, the
maximum output frequency of the digital pin is increased 3.5 times, too. This tremendous
increase of the output frequency is not always that visible when a plain C code is used,
and a portion of an application handling the fast port output might have to be written in
assembly code and executed in the ARM mode.
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1. How to read this chapter
The Ethernet controller is avialable in parts LPC2458 and LPC2460/68/70/78.
2. Basic configuration
The Ethernet controller is configured using the following registers:
Remark: On reset, the Ethernet block is disabled (PCENET = 0).
3. Pins: Select Ethernet pins and their modes in PINSEL2/3 and PINMODE2/3
Ethernet port to wake up the microcontroller from Power-down mode.
5. Interrupts: Interrupts are enabled in the VIC using the VICIntEnable register
3. Introduction
The Ethernet block contains a full featured 10 Mbps or 100 Mbps Ethernet MAC (Media
Access Controller) designed to provide optimized performance through the use of DMA
hardware acceleration. Features include a generous suite of control registers, half or full
duplex operation, flow control, control frames, hardware acceleration for transmit retry,
receive packet filtering and wake-up on LAN activity. Automatic frame transmission and
reception with Scatter-Gather DMA off-loads many operations from the CPU.
The Ethernet block and the CPU share a dedicated AHB subsystem (AHB2) that is used
to access the Ethernet SRAM for Ethernet data, control, and status information. All other
AHB traffic in the LPC2400 takes place on a different AHB subsystem, effectively
separating Ethernet activity from the rest of the system. The Ethernet DMA can also
access off-chip memory via the External Memory Controller, as well as the SRAM located
on AHB1, if is not being used by the USB block. However, using memory other than the
Ethernet SRAM, especially off-chip memory, will slow Ethernet access to memory and
increase the loading of AHB1.
The Ethernet block interfaces between an off-chip Ethernet PHY using the MII (Media
Independent Interface) or RMII (reduced MII) protocol. and the on-chip MIIM (Media
Independent Interface Management) serial bus.
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Chapter 11: LPC24XX Ethernet
Table 181. Ethernet acronyms, abbreviations, and definitions
Acronym or
Definition
Abbreviation
AHB
Advanced High-performance bus
Cyclic Redundancy Check
Direct Memory Access
CRC
DMA
Double-word
FCS
64 bit entity
Frame Check Sequence (CRC)
Fragment
A (part of an) Ethernet frame; one or multiple fragments can add up to a single
Ethernet frame.
Frame
An Ethernet frame consists of destination address, source address, length
type field, payload and frame check sequence.
Half-word
LAN
16 bit entity
Local Area Network
MAC
Media Access Control sublayer
Media Independent Interface
MII management
MII
MIIM
Octet
Packet
An 8 bit data entity, used in lieu of "byte" by IEEE 802.3
A frame that is transported across Ethernet; a packet consists of a preamble,
a start of frame delimiter and an Ethernet frame.
PHY
RMII
Rx
Ethernet Physical Layer
Reduced MII
Receive
TCP/IP
Transmission Control Protocol / Internet Protocol. The most common
high-level protocol used with Ethernet.
Tx
Transmit
VLAN
WoL
Word
Virtual LAN
Wake-up on LAN
32 bit entity
4. Features
• Ethernet standards support:
– Supports 10 or 100 Mbps PHY devices including 10 Base-T, 100 Base-TX,
100 Base-FX, and 100 Base-T4.
– Fully compliant with IEEE standard 802.3.
– Fully compliant with 802.3x Full Duplex Flow Control and Half Duplex back
pressure.
– Flexible transmit and receive frame options.
– VLAN frame support.
• Memory management:
– Independent transmit and receive buffers memory mapped to shared SRAM.
– DMA managers with scatter/gather DMA and arrays of frame descriptors.
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Chapter 11: LPC24XX Ethernet
– Memory traffic optimized by buffering and pre-fetching.
• Enhanced Ethernet features:
– Receive filtering.
– Multicast and broadcast frame support for both transmit and receive.
– Optional automatic FCS insertion (CRC) for transmit.
– Selectable automatic transmit frame padding.
– Over-length frame support for both transmit and receive allows any length frames.
– Promiscuous receive mode.
– Automatic collision backoff and frame retransmission.
– Includes power management by clock switching.
– Wake-on-LAN power management support allows system wake-up: using the
receive filters or a magic frame detection filter.
• Physical interface:
– Attachment of external PHY chip through standard Media Independent Interface
(MII) or standard Reduced MII (RMII) interface, software selectable.
– PHY register access is available via the Media Independent Interface Management
(MIIM) interface.
5. Ethernet architecture
Figure 11–26 shows the internal architecture of the Ethernet block.
TRANSMIT
HOST
FLOW
REGISTERS
CONTROL
register
interface (AHB
slave)
RMII
TRANSMIT
DMA
TRANSMIT
RETRY
MII or
RMII
MII
DMA interface
(AHB master)
RECEIVE
DMA
RECEIVE
BUFFER
MIIM
RECEIVE
FILTER
ETHERNET
BLOCK
Fig 26. Ethernet block diagram
The block diagram for the Ethernet block consists of:
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Chapter 11: LPC24XX Ethernet
• The host registers module containing the registers in the software view and handling
AHB accesses to the Ethernet block. The host registers connect to the transmit and
receive datapath as well as the MAC.
• The DMA to AHB interface. This provides an AHB master connection that allows the
Ethernet block to access the Ethernet SRAM for reading of descriptors, writing of
status, and reading and writing data buffers.
• The Ethernet MAC and attached RMII adapter. The MAC interfaces to the off-chip
PHY.
• The transmit datapath, including:
– The transmit DMA manager which reads descriptors and data from memory and
writes status to memory.
– The transmit retry module handling Ethernet retry and abort situations.
– The transmit flow control module which can insert Ethernet pause frames.
• The receive datapath, including:
– The receive DMA manager which reads descriptors from memory and writes data
and status to memory.
– The Ethernet MAC which detects frame types by parsing part of the frame header.
– The receive filter which can filter out certain Ethernet frames by applying different
filtering schemes.
– The receive buffer implementing a delay for receive frames to allow the filter to
filter out certain frames before storing them to memory.
5.1 Partitioning
The Ethernet block and associated device driver software offer the functionality of the
Media Access Control (MAC) sublayer of the data link layer in the OSI reference model
(see IEEE std 802.3). The MAC sublayer offers the service of transmitting and receiving
frames to the next higher protocol level, the MAC client layer, typically the Logical Link
Control sublayer. The device driver software implements the interface to the MAC client
layer. It sets up registers in the Ethernet block, maintains descriptor arrays pointing to
frames in memory and receives results back from the Ethernet block through interrupts.
When a frame is transmitted, the software partially sets up the Ethernet frames by
providing pointers to the destination address field, source address field, the length/type
field, the MAC client data field and optionally the CRC in the frame check sequence field.
Preferably concatenation of frame fields should be done by using the scatter/gather
functionality of the Ethernet core to avoid unnecessary copying of data. The hardware
adds the preamble and start frame delimiter fields and can optionally add the CRC, if
requested by software. When a packet is received the hardware strips the preamble and
start frame delimiter and passes the rest of the packet - the Ethernet frame - to the device
driver, including destination address, source address, length/type field, MAC client data
and frame check sequence (FCS).
Apart from the MAC, the Ethernet block contains receive and transmit DMA managers that
control receive and transmit data streams between the MAC and the AHB interface.
Frames are passed via descriptor arrays located in host memory, so that the hardware
can process many frames without software/CPU support. Frames can consist of multiple
fragments that are accessed with scatter/gather DMA. The DMA managers optimize
memory bandwidth using prefetching and buffering.
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Chapter 11: LPC24XX Ethernet
A receive filter block is used to identify received frames that are not addressed to this
Ethernet station, so that they can be discarded. The Rx filters include a perfect address
filter and a hash filter.
Wake-on-LAN power management support makes it possible to wake the system up from
a power-down state -a state in which some of the clocks are switched off -when wake-up
frames are received over the LAN. Wake-up frames are recognized by the receive filtering
modules or by a Magic Frame detection technology. System wake-up occurs by triggering
an interrupt.
An interrupt logic block raises and masks interrupts and keeps track of the cause of
interrupts. The interrupt block sends an interrupt request signal to the host system.
Interrupts can be enabled, cleared and set by software.
Support for IEEE 802.3/clause 31 flow control is implemented in the flow control block.
Receive flow control frames are automatically handled by the MAC. Transmit flow control
frames can be initiated by software. In half duplex mode, the flow control module will
generate back pressure by sending out continuous preamble only, interrupted by pauses
to prevent the jabber limit from being exceeded.
The Ethernet block has both a standard IEEE 802.3/clause 22 Media Independent
Interface (MII) bus and a Reduced Media Independent Interface (RMII) to connect to an
external Ethernet PHY chip. MII or RMII mode can be selected by the RMII bit in the
Command register. The standard nibble-wide MII interface allows a low speed data
connection to the PHY chip: 2.5 MHz at 10 Mbps or 25 MHz at 100 Mbps. The RMII
interface allows a low pin count double clock data connection to the PHY. Registers in the
PHY chip are accessed via the AHB interface through the serial management connection
of the MII bus (MIIM) operating at 2.5 MHz.
5.2 Example PHY Devices
Table 182. Example PHY Devices
Manufacturer
Broadcom
ICS
Part Number(s)
BCM5221
ICS1893
Intel
LXT971A
LSI Logic
Micrel
L80223, L80225, L80227
KS8721
National
SMSC
DP83847, DP83846, DP83843
LAN83C185
5.3 DMA engine functions
The Ethernet block is designed to provide optimized performance via DMA hardware
acceleration. Independent scatter/gather DMA engines connected to the AHB bus off-load
many data transfers from the ARM7 CPU.
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Chapter 11: LPC24XX Ethernet
Descriptors, which are stored in memory, contain information about fragments of incoming
or outgoing Ethernet frames. A fragment may be an entire frame or a much smaller
amount of data. Each descriptor contains a pointer to a memory buffer that holds data
associated with a fragment, the size of the fragment buffer, and details of how the
fragment will be transmitted or received.
Descriptors are stored in arrays in memory, which are located by pointer registers in the
Ethernet block. Other registers determine the size of the arrays, point to the next
descriptor in each array that will be used by the DMA engine, and point to the next
descriptor in each array that will be used by the Ethernet device driver.
5.4 Overview of DMA operation
The DMA engine makes use of a Receive descriptor array and a Transmit descriptor array
in memory. All or part of an Ethernet frame may be contained in a memory buffer
associated with a descriptor. When transmitting, the transmit DMA engine uses as many
descriptors as needed (one or more) to obtain (gather) all of the parts of a frame, and
sends them out in sequence. When receiving, the receive DMA engine also uses as many
descriptors as needed (one or more) to find places to store (scatter) all of the data in the
received frame.
The base address registers for the descriptor array, registers indicating the number of
descriptor array entries, and descriptor array input/output pointers are contained in the
Ethernet block. The descriptor entries and all transmit and receive packet data are stored
in memory which is not a part of the Ethernet block. The descriptor entries tell where
related frame data is stored in memory, certain aspects of how the data is handled, and
the result status of each Ethernet transaction.
Hardware in the DMA engine controls how data incoming from the Ethernet MAC is saved
to memory, causes fragment related status to be saved, and advances the hardware
receive pointer for incoming data. Driver software must handle the disposition of received
data, changing of descriptor data addresses (to avoid unnecessary data movement), and
advancing the software receive pointer. The two pointers create a circular queue in the
descriptor array and allow both the DMA hardware and the driver software to know which
descriptors (if any) are available for their use, including whether the descriptor array is
empty or full.
Similarly, driver software must set up pointers to data that will be transmitted by the
Ethernet MAC, giving instructions for each fragment of data, and advancing the software
transmit pointer for outgoing data. Hardware in the DMA engine reads this information and
sends the data to the Ethernet MAC interface when possible, updating the status and
advancing the hardware transmit pointer.
5.5 Ethernet Packet
Figure 11–27 illustrates the different fields in an Ethernet packet.
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Chapter 11: LPC24XX Ethernet
ethernet packet
ETHERNET FRAME
PREAMBLE
7 bytes
start-of-frame
delimiter
1 byte
DESTINATION
ADDRESS
SOURCE
ADDRESS
OPTIONAL LEN
PAYLOAD
FCS
VLAN
TYPE
DesA
oct6
DesA
oct5
DesA
oct4
DesA
oct3
DesA
oct2
DesA
oct1
SrcA
oct6
SrcA
oct5
SrcA
oct4
SrcA
oct3
SrcA
oct2
SrcA
oct1
LSB
MSB
oct(0) oct(1) oct(2) oct(3) oct(4) oct(5)
oct(6) oct(7)
time
Fig 27. Ethernet packet fields
A packet consists of a preamble, a start-of-frame delimiter and an Ethernet frame.
The Ethernet frame consists of the destination address, the source address, an optional
VLAN field, the length/type field, the payload and the frame check sequence.
Each address consists of 6 bytes where each byte consists of 8 bits. Bits are transferred
starting with the least significant bit.
6. Pin description
Independent Interface (RMII) to the external PHY.
Table 183. Ethernet MII pin descriptions
Pin Name
Type
Pin Description
Transmit data enable.
Transmit data, 4 bits.
Transmit error.
ENET_TX_EN
ENET_TXD[3:0]
ENET_TX_ER
ENET_TX_CLK
Output
Output
Output
Input
Transmit clock.
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Chapter 11: LPC24XX Ethernet
Table 183. Ethernet MII pin descriptions
Pin Name
Type
Input
Input
Input
Input
Input
Input
Pin Description
Receive data valid.
Receive data.
ENET_RX_DV
ENET_RXD[3:0]
ENET_RX_ER
ENET_RX_CLK
ENET_COL
Receive error.
Receive clock
Collision detect.
Carrier sense.
ENET_CRS
Table 184. Ethernet RMII pin descriptions
Pin Name
Type
Pin Description
ENET_TX_EN
ENET_TXD[1:0]
ENET_RXD[1:0]
ENET_RX_ER
ENET_CRS
Output
Output
Input
Transmit data enable
Transmit data, 2 bits
Receive data, 2 bits.
Receive error.
Input
Input
Carrier sense/data valid.
Reference clock
ENET_REF_CLK/ Input
ENET_RX_CLK
(MIIM) of the external PHY.
Table 185. Ethernet MIIM pin descriptions
Pin Name
Type
Pin Description
MIIM clock.
ENET_MDC
ENET_MDIO
Output
Input/Output
MI data input and output
7. Register description
The software interface of the Ethernet block consists of a register view and the format
definitions for the transmit and receive descriptors. These two aspects are addressed in
the next two subsections.
AHB address space required is 4 kilobytes.
After a hard reset or a soft reset via the RegReset bit of the Command register all bits in
all registers are reset to 0 unless stated otherwise in the following register descriptions.
Some registers will have unused bits which will return a 0 on a read via the AHB interface.
Writing to unused register bits of an otherwise writable register will not have side effects.
The register map consists of registers in the Ethernet MAC and registers around the core
for controlling DMA transfers, flow control and filtering.
Reading from reserved addresses or reserved bits leads to unpredictable data. Writing to
reserved addresses or reserved bits has no effect.
Reading of write-only registers will return a read error on the AHB interface. Writing of
read-only registers will return a write error on the AHB interface.
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Chapter 11: LPC24XX Ethernet
Table 186. Summary of Ethernet registers
Symbol
Address
R/W Description
MAC registers
MAC1
MAC2
IPGT
0xFFE0 0000
0xFFE0 0004
0xFFE0 0008
0xFFE0 000C
0xFFE0 0010
0xFFE0 0014
0xFFE0 0018
0xFFE0 001C
0xFFE0 0020
0xFFE0 0024
0xFFE0 0028
0xFFE0 002C
0xFFE0 0030
0xFFE0 0034
R/W MAC configuration register 1.
R/W MAC configuration register 2.
R/W Back-to-Back Inter-Packet-Gap register.
R/W Non Back-to-Back Inter-Packet-Gap register.
R/W Collision window / Retry register.
R/W Maximum Frame register.
IPGR
CLRT
MAXF
SUPP
TEST
R/W PHY Support register.
R/W Test register.
MCFG
MCMD
MADR
MWTD
MRDD
MIND
R/W MII Mgmt Configuration register.
R/W MII Mgmt Command register.
R/W MII Mgmt Address register.
WO MII Mgmt Write Data register.
RO MII Mgmt Read Data register.
RO MII Mgmt Indicators register.
-
0xFFE0 0038 to
0xFFE0 003F
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
SA0
SA1
SA2
-
0xFFE0 0040
0xFFE0 0044
0xFFE0 0048
R/W Station Address 0 register.
R/W Station Address 1 register.
R/W Station Address 2 register.
0xFFE0 004C to -
0xFFE0 00FC
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
Control registers
Command
Status
0xFFE0 0100
0xFFE0 0104
0xFFE0 0108
0xFFE0 010C
R/W Command register.
RO Status register.
RxDescriptor
RxStatus
R/W Receive descriptor base address register.
R/W Receive status base address register.
R/W Receive number of descriptors register.
RO Receive produce index register.
R/W Receive consume index register.
R/W Transmit descriptor base address register.
R/W Transmit status base address register.
R/W Transmit number of descriptors register.
R/W Transmit produce index register.
RO Transmit consume index register.
RxDescriptorNumber 0xFFE0 0110
RxProduceIndex
RxConsumeIndex
TxDescriptor
TxStatus
0xFFE0 0114
0xFFE0 0118
0xFFE0 011C
0xFFE0 0120
TxDescriptorNumber 0xFFE0 0124
TxProduceIndex
0xFFE0 0128
0xFFE0 012C
TxConsumeIndex
-
0xFFE0 0130 to
0xFFE0 0154
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
TSV0
TSV1
0xFFE0 0158
0xFFE0 015C
RO Transmit status vector 0 register.
RO Transmit status vector 1 register.
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Chapter 11: LPC24XX Ethernet
Table 186. Summary of Ethernet registers
Symbol
Address
R/W Description
RO Receive status vector register.
RSV
-
0xFFE0 0160
0xFFE0 0164 to
0xFFE0 016C
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
FlowControlCounter 0xFFE0 0170
R/W Flow control counter register.
RO Flow control status register.
FlowControlStatus
-
0xFFE0 0174
0xFFE0 0178 to
0xFFE0 01FC
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
Rx filter registers
RxFliterCtrl
0xFFE0 0200
0xFFE0 0204
0xFFE0 0208
0xFFE0 020C
Receive filter control register.
Receive filter WoL status register.
Receive filter WoL clear register.
RxFilterWoLStatus
RxFilterWoLClear
-
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
HashFilterL
HashFilterH
-
0xFFE0 0210
0xFFE0 0214
Hash filter table LSBs register.
Hash filter table MSBs register.
0xFFE0 0218 to
0xFFE0 0FDC
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
Module control registers
IntStatus
IntEnable
IntClear
IntSet
0xFFE0 0FE0
RO Interrupt status register.
R/W Interrupt enable register.
WO Interrupt clear register.
WO Interrupt set register.
0xFFE0 0FE4
0xFFE0 0FE8
0xFFE0 0FEC
0xFFE0 0FF0
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
PowerDown
-
0xFFE0 0FF4
0xFFE0 0FF8
R/W Power-down register.
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit
is not defined.
The third column in the table lists the accessibility of the register: read-only, write-only,
read/write.
All AHB register write transactions except for accesses to the interrupt registers are
posted i.e. the AHB transaction will complete before write data is actually committed to the
register. Accesses to the interrupt registers will only be completed by accepting the write
data when the data has been committed to the register.
7.1 Ethernet MAC register definitions
This section defines the bits in the individual registers of the Ethernet block register map.
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7.1.1 MAC Configuration Register 1 (MAC1 - 0xFFE0 0000)
The MAC configuration register 1 (MAC1) has an address of 0xFFE0 0000. Its bit
Table 187. MAC Configuration register 1 (MAC1 - address 0xFFE0 0000) bit description
Bit
Symbol
Function
Reset
value
0
RECEIVE ENABLE
Set this to allow receive frames to be received. Internally the MAC synchronizes
this control bit to the incoming receive stream.
0
0
0
0
0
1
PASS ALL RECEIVE When enabled (set to ’1’), the MAC will pass all frames regardless of type (normal
FRAMES vs. Control). When disabled, the MAC does not pass valid Control frames.
2
RX FLOW CONTROL When enabled (set to ’1’), the MAC acts upon received PAUSE Flow Control
frames. When disabled, received PAUSE Flow Control frames are ignored.
3
TX FLOW CONTROL When enabled (set to ’1’), PAUSE Flow Control frames are allowed to be
transmitted. When disabled, Flow Control frames are blocked.
4
LOOPBACK
Setting this bit will cause the MAC Transmit interface to be looped back to the MAC
Receive interface. Clearing this bit results in normal operation.
7:5
8
-
Unused
0x0
0
RESET TX
Setting this bit will put the Transmit Function logic in reset.
9
RESET MCS / TX
Setting this bit resets the MAC Control Sublayer / Transmit logic. The MCS logic
implements flow control.
0
10
11
RESET RX
Setting this bit will put the Ethernet receive logic in reset.
0
RESET MCS / RX
Setting this bit resets the MAC Control Sublayer / Receive logic. The MCS logic
implements flow control.
0x0
13:12
14
-
Reserved. User software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
0x0
0
SIMULATION RESET Setting this bit will cause a reset to the random number generator within the
Transmit Function.
15
SOFT RESET
Setting this bit will put all modules within the MAC in reset except the Host
Interface.
1
31:16
-
Reserved. User software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
0x0
7.1.2 MAC Configuration Register 2 (MAC2 - 0xFFE0 0004)
The MAC configuration register 2 (MAC2) has an address of 0xFFE0 0004. Its bit
Table 188. MAC Configuration register 2 (MAC2 - address 0xFFE0 0004) bit description
Bit
Symbol
Function
Reset
value
0
FULL-DUPLEX
When enabled (set to ’1’), the MAC operates in Full-Duplex mode. When disabled,
the MAC operates in Half-Duplex mode.
0
1
FRAME LENGTH
CHECKING
When enabled (set to ’1’), both transmit and receive frame lengths are compared to
the Length/Type field. If the Length/Type field represents a length then the check is
performed. Mismatches are reported in the StatusInfo word for each received frame.
0
2
HUGE FRAME
ENABLE
When enabled (set to ’1’), frames of any length are transmitted and received.
0
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Table 188. MAC Configuration register 2 (MAC2 - address 0xFFE0 0004) bit description
Bit
Symbol
Function
Reset
value
3
DELAYED CRC
This bit determines the number of bytes, if any, of proprietary header information
that exist on the front of IEEE 802.3 frames. When 1, four bytes of header (ignored
by the CRC function) are added. When 0, there is no proprietary header.
0
0
0
4
5
CRC ENABLE
Set this bit to append a CRC to every frame whether padding was required or not.
Must be set if PAD/CRC ENABLE is set. Clear this bit if frames presented to the
MAC contain a CRC.
PAD / CRC ENABLE Set this bit to have the MAC pad all short frames. Clear this bit if frames presented
to the MAC have a valid length. This bit is used in conjunction with AUTO PAD
the pad function.
6
7
VLAN PAD ENABLE Set this bit to cause the MAC to pad all short frames to 64 bytes and append a valid
padding features.
0
0
Note: This bit is ignored if PAD / CRC ENABLE is cleared.
AUTO DETECT PAD Set this bit to cause the MAC to automatically detect the type of frame, either tagged
ENABLE
or un-tagged, by comparing the two octets following the source address with
provides a description of the pad function based on the configuration of this register.
Note: This bit is ignored if PAD / CRC ENABLE is cleared.
8
9
PURE PREAMBLE
ENFORCEMENT
When enabled (set to ’1’), the MAC will verify the content of the preamble to ensure
it contains 0x55 and is error-free. A packet with an incorrect preamble is discarded.
When disabled, no preamble checking is performed.
0
0
LONG PREAMBLE
ENFORCEMENT
When enabled (set to ’1’), the MAC only allows receive packets which contain
preamble fields less than 12 bytes in length. When disabled, the MAC allows any
length preamble as per the Standard.
11:10
12
-
Reserved. User software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
0x0
0
NO BACKOFF
When enabled (set to ’1’), the MAC will immediately retransmit following a collision
rather than using the Binary Exponential Backoff algorithm as specified in the
Standard.
13
BACK PRESSURE / When enabled (set to ’1’), after the MAC incidentally causes a collision during back
0
NO BACKOFF
pressure, it will immediately retransmit without backoff, reducing the chance of
further collisions and ensuring transmit packets get sent.
14
EXCESS DEFER
When enabled (set to ’1’) the MAC will defer to carrier indefinitely as per the
Standard. When disabled, the MAC will abort when the excessive deferral limit is
reached.
0
31:15
-
Reserved. User software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
0x0
Table 189. Pad operation
Type Auto detect VLAN pad
pad enable enable
Pad/CRC
enable
Action
MAC2 [7]
MAC2 [6]
MAC2 [5]
Any
Any
Any
Any
x
0
x
1
x
0
1
0
0
1
1
1
No pad or CRC check
Pad to 60 bytes, append CRC
Pad to 64 bytes, append CRC
If untagged, pad to 60 bytes and append CRC. If VLAN tagged: pad to
64 bytes and append CRC.
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7.1.3 Back-to-Back Inter-Packet-Gap Register (IPGT - 0xFFE0 0008)
The Back-to-Back Inter-Packet-Gap register (IPGT) has an address of 0xFFE0 0008. Its
Table 190. Back-to-back Inter-packet-gap register (IPGT - address 0xFFE0 0008) bit description
Bit
Symbol
Function
Reset
value
6:0
BACK-TO-BACK
INTER-PACKET-GAP
This is a programmable field representing the nibble time offset of the minimum 0x0
possible period between the end of any transmitted packet to the beginning of the
next. In Full-Duplex mode, the register value should be the desired period in
nibble times minus 3. In Half-Duplex mode, the register value should be the
desired period in nibble times minus 6. In Full-Duplex the recommended setting is
0x15 (21d), which represents the minimum IPG of 960 ns (in 100 Mbps mode) or
9.6 µs (in 10 Mbps mode). In Half-Duplex the recommended setting is 0x12 (18d),
which also represents the minimum IPG of 960 ns (in 100 Mbps mode) or 9.6 µs
(in 10 Mbps mode).
31:7
-
Reserved. User software should not write ones to reserved bits. The value read 0x0
from a reserved bit is not defined.
7.1.4 Non Back-to-Back Inter-Packet-Gap Register (IPGR - 0xFFE0 000C)
The Non Back-to-Back Inter-Packet-Gap register (IPGR) has an address of
Table 191. Non Back-to-back Inter-packet-gap register (IPGR - address 0xFFE0 000C) bit description
Bit
Symbol
Function
Reset
value
6:0
NON-BACK-TO-BACK
INTER-PACKET-GAP PART2
This is a programmable field representing the Non-Back-to-Back
Inter-Packet-Gap. The recommended value is 0x12 (18d), which
represents the minimum IPG of 960 ns (in 100 Mbps mode) or 9.6 µs (in
10 Mbps mode).
0x0
7
-
Reserved. User software should not write ones to reserved bits. The value 0x0
read from a reserved bit is not defined.
14:8 NON-BACK-TO-BACK
INTER-PACKET-GAP PART1
This is a programmable field representing the optional carrierSense
window referenced in IEEE 802.3/4.2.3.2.1 'Carrier Deference'. If carrier is
detected during the timing of IPGR1, the MAC defers to carrier. If,
however, carrier becomes active after IPGR1, the MAC continues timing
IPGR2 and transmits, knowingly causing a collision, thus ensuring fair
access to medium. Its range of values is 0x0 to IPGR2. The recommended
value is 0xC (12d)
0x0
31:15 -
Reserved. User software should not write ones to reserved bits. The value 0x0
read from a reserved bit is not defined.
7.1.5 Collision Window / Retry Register (CLRT - 0xFFE0 0010)
The Collision window / Retry register (CLRT) has an address of 0xFFE0 0010. Its bit
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Table 192. Collision Window / Retry register (CLRT - address 0xFFE0 0010) bit description
Bit
Symbol
Function
Reset
value
3:0
RETRANSMISSION This is a programmable field specifying the number of retransmission attempts
0xF
MAXIMUM
-
following a collision before aborting the packet due to excessive collisions. The
Standard specifies the attemptLimit to be 0xF (15d). See IEEE 802.3/4.2.3.2.5.
7:4
Reserved. User software should not write ones to reserved bits. The value read from 0x0
a reserved bit is not defined.
13:8
COLLISION
WINDOW
This is a programmable field representing the slot time or collision window during
which collisions occur in properly configured networks. The default value of 0x37
(55d) represents a 56 byte window following the preamble and SFD.
0x37
31:14
-
Reserved, user software should not write ones to reserved bits. The value read from NA
a reserved bit is not defined.
7.1.6 Maximum Frame Register (MAXF - 0xFFE0 0014)
The Maximum Frame register (MAXF) has an address of 0xFFE0 0014. Its bit definition is
Table 193. Maximum Frame register (MAXF - address 0xFFE0 0014) bit description
Bit
Symbol
Function
Reset
value
15:0
MAXIMUM FRAME This field resets to the value 0x0600, which represents a maximum receive frame of 0x0600
LENGTH
1536 octets. An untagged maximum size Ethernet frame is 1518 octets. A tagged
frame adds four octets for a total of 1522 octets. If a shorter maximum length
restriction is desired, program this 16 bit field.
31:16
-
Unused
0x0
7.1.7 PHY Support Register (SUPP - 0xFFE0 0018)
The PHY Support register (SUPP) has an address of 0xFFE0 0018. The SUPP register
provides additional control over the RMII interface. The bit definition of this register is
Table 194. PHY Support register (SUPP - address 0xFFE0 0018) bit description
Bit
Symbol
Function
Reset
value
7:0
8
-
Unused
0x0
0
SPEED
This bit configures the Reduced MII logic for the current operating speed. When set,
100 Mbps mode is selected. When cleared, 10 Mbps mode is selected.
31:9
-
Unused
0x0
Unused bits in the PHY support register should be left as zeroes.
7.1.8 Test Register (TEST - 0xFFE0 001C)
The Test register (TEST) has an address of 0xFFE0 001C. The bit definition of this
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Table 195. Test register (TEST - address 0xFFE0 ) bit description
Bit
Symbol
Function
Reset
value
0
SHORTCUT PAUSE This bit reduces the effective PAUSE quanta from 64 byte-times to 1 byte-time.
QUANTA
0
0
0
1
TEST PAUSE
This bit causes the MAC Control sublayer to inhibit transmissions, just as if a
PAUSE Receive Control frame with a nonzero pause time parameter was received.
2
TEST
BACKPRESSURE
Setting this bit will cause the MAC to assert backpressure on the link. Backpressure
causes preamble to be transmitted, raising carrier sense. A transmit packet from the
system will be sent during backpressure.
31:3
-
Unused
0x0
7.1.9 MII Mgmt Configuration Register (MCFG - 0xFFE0 0020)
The MII Mgmt Configuration register (MCFG) has an address of 0xFFE0 0020. The bit
Table 196. MII Mgmt Configuration register (MCFG - address 0xFFE0 0020) bit description
Bit
Symbol
Function
Reset
value
0
SCAN INCREMENT Set this bit to cause the MII Management hardware to perform read cycles across a
range of PHYs. When set, the MII Management hardware will perform read cycles
from address 1 through the value set in PHY ADDRESS[4:0]. Clear this bit to allow
continuous reads of the same PHY.
0
1
SUPPRESS
PREAMBLE
Set this bit to cause the MII Management hardware to perform read/write cycles
without the 32 bit preamble field. Clear this bit to cause normal cycles to be
performed. Some PHYs support suppressed preamble.
0
0
4:2
CLOCK SELECT
This field is used by the clock divide logic in creating the MII Management Clock
(MDC) which IEEE 802.3u defines to be no faster than 2.5 MHz. Some PHYs
definition of values for this field.
14:5
15
-
Unused
0x0
0
RESET MII MGMT
-
This bit resets the MII Management hardware.
Unused
31:16
0x0
Table 197. Clock select encoding
Clock Select
Bit 4
Bit 3
Bit 2
Host Clock divided by 4
Host Clock divided by 6
Host Clock divided by 8
Host Clock divided by 10
Host Clock divided by 14
Host Clock divided by 20
Host Clock divided by 28
0
0
0
1
1
1
1
0
1
1
0
0
1
1
x
0
1
0
1
0
1
7.1.10 MII Mgmt Command Register (MCMD - 0xFFE0 0024)
The MII Mgmt Command register (MCMD) has an address of 0xFFE0 0024. The bit
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Table 198. MII Mgmt Command register (MCMD - address 0xFFE0 0024) bit description
Bit
Symbol Function
Reset
value
0
READ
SCAN
-
This bit causes the MII Management hardware to perform a single Read cycle. The Read data is
returned in Register MRDD (MII Mgmt Read Data).
0
1
This bit causes the MII Management hardware to perform Read cycles continuously. This is
useful for monitoring Link Fail for example.
0
31:2
Unused
0x0
7.1.11 MII Mgmt Address Register (MADR - 0xFFE0 0028)
The MII Mgmt Address register (MADR) has an address of 0xFFE0 0028. The bit
Table 199. MII Mgmt Address register (MADR - address 0xFFE0 0028) bit description
Bit
Symbol
Function
Reset
value
4:0
REGISTER
ADDRESS
This field represents the 5 bit Register Address field of Mgmt 0x0
cycles. Up to 32 registers can be accessed.
7:5
-
Unused
0x0
0x0
12:8
PHY ADDRESS This field represents the 5 bit PHY Address field of Mgmt
cycles. Up to 31 PHYs can be addressed (0 is reserved).
31:13
-
Unused
0x0
7.1.12 MII Mgmt Write Data Register (MWTD - 0xFFE0 002C)
The MII Mgmt Write Data register (MWTD) is a Write Only register with an address of
Table 200. MII Mgmt Write Data register (MWTD - address 0xFFE0 002C) bit description
Bit
Symbol
Function
Reset
value
15:0
WRITE
DATA
When written, an MII Mgmt write cycle is performed using the 16 bit 0x0
data and the pre-configured PHY and Register addresses from the
MII Mgmt Address register (MADR).
31:16
-
Unused
0x0
7.1.13 MII Mgmt Read Data Register (MRDD - 0xFFE0 0030)
The MII Mgmt Read Data register (MRDD) is a Read Only register with an address of
Table 201. MII Mgmt Read Data register (MRDD - address 0xFFE0 0030) bit description
Bit
Symbol Function
Reset
value
15:0
31:16
READ
DATA
Following an MII Mgmt Read Cycle, the 16 bit data can be read from
this location.
0x0
-
Unused
0x0
7.1.14 MII Mgmt Indicators Register (MIND - 0xFFE0 0034)
The MII Mgmt Indicators register (MIND) is a Read Only register with an address of
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Table 202. MII Mgmt Indicators register (MIND - address 0xFFE0 0034) bit description
Bit
Symbol
Function
Reset
value
0
BUSY
When ’1’ is returned - indicates MII Mgmt is currently performing an
MII Mgmt Read or Write cycle.
0
1
SCANNING When ’1’ is returned - indicates a scan operation (continuous MII
Mgmt Read cycles) is in progress.
0
2
NOT VALID When ’1’ is returned - indicates MII Mgmt Read cycle has not
completed and the Read Data is not yet valid.
0
3
MII Link Fail When ’1’ is returned - indicates that an MII Mgmt link fail has
occurred.
0
31:4
-
Unused
0x0
Here are two examples to access PHY via the MII Management Controller.
For PHY Write if scan is not used:
1. Write 0 to MCMD
2. Write PHY address and register address to MADR
3. Write data to MWTD
4. Wait for busy bit to be cleared in MIND
For PHY Read if scan is not used:
1. Write 1 to MCMD
2. Write PHY address and register address to MADR
3. Wait for busy bit to be cleared in MIND
4. Write 0 to MCMD
5. Read data from MRDD
7.1.15 Station Address 0 Register (SA0 - 0xFFE0 0040)
The Station Address 0 register (SA0) has an address of 0xFFE0 0040. The bit definition of
Table 203. Station Address register (SA0 - address 0xFFE0 0040) bit description
Bit
Symbol
Function
Reset
value
7:0
STATION ADDRESS, This field holds the second octet of the station address.
2nd octet
0x0
0x0
0x0
15:8
31:16
STATION ADDRESS, This field holds the first octet of the station address.
1st octet
-
Unused
The station address is used for perfect address filtering and for sending pause control
7.1.16 Station Address 1 Register (SA1 - 0xFFE0 0044)
The Station Address 1 register (SA1) has an address of 0xFFE0 0044. The bit definition of
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Table 204. Station Address register (SA1 - address 0xFFE0 0044) bit description
Bit
Symbol
Function
Reset
value
7:0
STATION ADDRESS, This field holds the fourth octet of the station address.
4th octet
0x0
0x0
0x0
15:8
31:16
STATION ADDRESS, This field holds the third octet of the station address.
3rd octet
-
Unused
The station address is used for perfect address filtering and for sending pause control
7.1.17 Station Address 2 Register (SA2 - 0xFFE0 0048)
The Station Address 2 register (SA2) has an address of 0xFFE0 0048. The bit definition of
Table 205. Station Address register (SA2 - address 0xFFE0 0048) bit description
Bit
Symbol
Function
Reset
value
7:0
STATION ADDRESS, This field holds the sixth octet of the station address.
6th octet
0x0
0x0
0x0
15:8
31:16
STATION ADDRESS, This field holds the fifth octet of the station address.
5th octet
-
Unused
The station address is used for perfect address filtering and for sending pause control
7.2 Control register definitions
7.2.1 Command Register (Command - 0xFFE0 0100)
The Command register (Command) register has an address of 0xFFE0 0100. Its bit
Table 206. Command register (Command - address 0xFFE0 0100) bit description
Bit
Symbol
Function
Reset
value
0
1
2
3
RxEnable
TxEnable
-
Enable receive.
Enable transmit.
Unused
0
0
0x0
0
RegReset
When a ’1’ is written, all datapaths and the host registers are
reset. The MAC needs to be reset separately.
4
5
6
TxReset
RxReset
When a ’1’ is written, the transmit datapath is reset.
When a ’1’ is written, the receive datapath is reset.
0
0
0
PassRuntFrame When set to ’1’, passes runt frames smaller than 64 bytes to
memory unless they have a CRC error. If ’0’ runt frames are
filtered out.
7
PassRxFilter
When set to ’1’, disables receive filtering i.e. all frames
received are written to memory.
0
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Table 206. Command register (Command - address 0xFFE0 0100) bit description
Bit
Symbol
Function
Reset
value
8
TxFlowControl
RMII
Enable IEEE 802.3 / clause 31 flow control sending pause
frames in full duplex and continuous preamble in half duplex.
0
9
When set to ’1’, RMII mode is selected; if ’0’, MII mode is
selected.
0
10
FullDuplex
-
When set to ’1’, indicates full duplex operation.
Unused
0
31:11
0x0
All bits can be written and read. The Tx/RxReset bits are write only, reading will return a 0.
7.2.2 Status Register (Status - 0xFFE0 0104)
The Status register (Status) is a Read Only register with an address of 0xFFE0 0104. Its
Table 207. Status register (Status - address 0xFFE0 0104) bit description
Bit
Symbol Function
Reset
value
0
RxStatus If 1, the receive channel is active. If 0, the receive channel is inactive.
0
1
TxStatus If 1, the transmit channel is active. If 0, the transmit channel is inactive. 0
Unused 0x0
31:2
-
The values represent the status of the two channels/datapaths. When the status is 1, the
channel is active, meaning:
• It is enabled and the Rx/TxEnable bit is set in the Command register or it just got
disabled while still transmitting or receiving a frame.
• Also, for the transmit channel, the transmit queue is not empty
i.e. ProduceIndex != ConsumeIndex.
• Also, for the receive channel, the receive queue is not full
i.e. ProduceIndex != ConsumeIndex - 1.
The status transitions from active to inactive if the channel is disabled by a software reset
of the Rx/TxEnable bit in the Command register and the channel has committed the status
and data of the current frame to memory. The status also transitions to inactive if the
transmit queue is empty or if the receive queue is full and status and data have been
committed to memory.
7.2.3 Receive Descriptor Base Address Register (RxDescriptor - 0xFFE0 0108)
The Receive Descriptor base address register (RxDescriptor) has an address of
Table 208. Receive Descriptor Base Address register (RxDescriptor - address 0xFFE0 0108)
bit description
Bit
Symbol
Function
Reset
value
1:0
-
Fixed to ’00’
-
31:2 RxDescriptor
MSBs of receive descriptor base address.
0x0
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The receive descriptor base address is a byte address aligned to a word boundary i.e.
LSB 1:0 are fixed to ’00’. The register contains the lowest address in the array of
descriptors.
7.2.4 Receive Status Base Address Register (RxStatus - 0xFFE0 010C)
The receive descriptor base address is a byte address aligned to a word boundary i.e.
LSB 1:0 are fixed to ’00’. The register contains the lowest address in the array of
descriptors.
Table 209. receive Status Base Address register (RxStatus - address 0xFFE0 010C) bit
description
Bit
Symbol
Function
Reset
value
2:0
-
Fixed to ’000’
-
31:3 RxStatus
MSBs of receive status base address.
0x0
The receive status base address is a byte address aligned to a double word boundary i.e.
LSB 2:0 are fixed to ’000’.
7.2.5 Receive Number of Descriptors Register (RxDescriptor - 0xFFE0 0110)
The Receive Number of Descriptors register (RxDescriptorNumber) has an address of
Table 210. Receive Number of Descriptors register (RxDescriptor - address 0xFFE0 0110) bit
description
Bit
Symbol
Function
Reset
value
15:0
RxDescriptorNumber
Number of descriptors in the descriptor array for which 0x0
RxDescriptor is the base address. The number of
descriptors is minus one encoded.
31:16
-
Unused
0x0
The receive number of descriptors register defines the number of descriptors in the
descriptor array for which RxDescriptor is the base address. The number of descriptors
should match the number of statuses. The register uses minus one encoding i.e. if the
array has 8 elements, the value in the register should be 7.
7.2.6 Receive Produce Index Register (RxProduceIndex - 0xFFE0 0114)
The Receive Produce Index register (RxProduceIndex) is a Read Only register with an
Table 211. Receive Produce Index register (RxProduceIndex - address 0xFFE0 0114) bit
description
Bit
Symbol
Function
Reset
value
15:0
31:16
RxProduceIndex Index of the descriptor that is going to be filled next by the
receive datapath.
0x0
-
Unused
0x0
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The receive produce index register defines the descriptor that is going to be filled next by
the hardware receive process. After a frame has been received, hardware increments the
index. The value is wrapped to 0 once the value of RxDescriptorNumber has been
reached. If the RxProduceIndex equals RxConsumeIndex - 1, the array is full and any
further frames being received will cause a buffer overrun error.
7.2.7 Receive Consume Index Register (RxConsumeIndex - 0xFFE0 0118)
The Receive consume index register (RxConsumeIndex) has an address of
Table 212. Receive Consume Index register (RXConsumeIndex - address 0xFFE0 0118) bit
description
Bit
Symbol
Function
Reset
value
15:0
31:16
RxConsumeIndex Index of the descriptor that is going to be processed next by
the receive
-
Unused
0x0
The receive consume register defines the descriptor that is going to be processed next by
the software receive driver. The receive array is empty as long as RxProduceIndex equals
RxConsumeIndex. As soon as the array is not empty, software can process the frame
pointed to by RxConsumeIndex. After a frame has been processed by software, software
should increment the RxConsumeIndex. The value must be wrapped to 0 once the value
of RxDescriptorNumber has been reached. If the RxProduceIndex equals
RxConsumeIndex - 1, the array is full and any further frames being received will cause a
buffer overrun error.
7.2.8 Transmit Descriptor Base Address Register (TxDescriptor - 0xFFE0 011C)
The Transmit Descriptor base address register (TxDescriptor) has an address of
Table 213. Transmit Descriptor Base Address register (TxDescriptor - address 0xFFE0 011C)
bit description
Bit
Symbol
Function
Reset
value
1:0
-
Fixed to ’00’
-
31:2 TxDescriptor
MSBs of transmit descriptor base address.
0x0
The transmit descriptor base address is a byte address aligned to a word boundary i.e.
LSB 1:0 are fixed to ’00’. The register contains the lowest address in the array of
descriptors.
7.2.9 Transmit Status Base Address Register (TxStatus - 0xFFE0 0120)
The Transmit Status base address register (TxStatus) has an address of 0xFFE0 0120. Its
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Table 214. Transmit Status Base Address register (TxStatus - address 0xFFE0 0120) bit
description
Bit
Symbol
Function
Reset
value
1:0
-
Fixed to ’00’
-
31:2
TxStatus
MSBs of transmit status base address.
0x0
The transmit status base address is a byte address aligned to a word boundary i.e. LSB
1:0 are fixed to ’00’. The register contains the lowest address in the array of statuses.
7.2.10 Transmit Number of Descriptors Register (TxDescriptorNumber -
0xFFE0 0124)
The Transmit Number of Descriptors register (TxDescriptorNumber) has an address of
Table 215. Transmit Number of Descriptors register (TxDescriptorNumber - address
0xFFE0 0124) bit description
Bit
Symbol
Function
Reset
value
15:0
TxDescriptorNumber Number of descriptors in the descriptor array for which
TxDescriptor is the base address. The register is minus
one encoded.
31:16
-
Unused
0x0
The transmit number of descriptors register defines the number of descriptors in the
descriptor array for which TxDescriptor is the base address. The number of descriptors
should match the number of statuses. The register uses minus one encoding i.e. if the
array has 8 elements, the value in the register should be 7.
7.2.11 Transmit Produce Index Register (TxProduceIndex - 0xFFE0 0128)
The Transmit Produce Index register (TxProduceIndex) has an address of 0xFFE0 0128.
Table 216. Transmit Produce Index register (TxProduceIndex - address 0xFFE0 0128) bit
description
Bit
Symbol
Function
Reset
value
15:0
31:16
TxProduceIndex Index of the descriptor that is going to be filled next by the
transmit software driver.
0x0
-
Unused
0x0
The transmit produce index register defines the descriptor that is going to be filled next by
the software transmit driver. The transmit descriptor array is empty as long as
TxProduceIndex equals TxConsumeIndex. If the transmit hardware is enabled, it will start
transmitting frames as soon as the descriptor array is not empty. After a frame has been
processed by software, it should increment the TxProduceIndex. The value must be
wrapped to 0 once the value of TxDescriptorNumber has been reached. If the
TxProduceIndex equals TxConsumeIndex - 1 the descriptor array is full and software
should stop producing new descriptors until hardware has transmitted some frames and
updated the TxConsumeIndex.
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7.2.12 Transmit Consume Index Register (TxConsumeIndex - 0xFFE0 012C)
The Transmit Consume Index register (TxConsumeIndex) is a Read Only register with an
Table 217. Transmit Consume Index register (TxConsumeIndex - address 0xFFE0 012C) bit
description
Bit
Symbol
Function
Reset
value
15:0
31:16
TxConsumeIndex Index of the descriptor that is going to be transmitted next by 0x0
the transmit datapath.
-
Unused
0x0
The transmit consume index register defines the descriptor that is going to be transmitted
next by the hardware transmit process. After a frame has been transmitted hardware
increments the index, wrapping the value to 0 once the value of TxDescriptorNumber has
been reached. If the TxConsumeIndex equals TxProduceIndex the descriptor array is
empty and the transmit channel will stop transmitting until software produces new
descriptors.
7.2.13 Transmit Status Vector 0 Register (TSV0 - 0xFFE0 0158)
The Transmit Status Vector 0 register (TSV0) is a Read Only register with an address of
0xFFE0 0158. The transmit status vector registers store the most recent transmit status
returned by the MAC. Since the status vector consists of more than 4 bytes, status is
distributed over two registers TSV0 and TSV1. These registers are provided for debug
purposes, because the communication between driver software and the Ethernet block
takes place primarily through the frame descriptors. The status register contents are valid
as long as the internal status of the MAC is valid and should typically only be read when
the transmit and receive processes are halted.
Table 218. Transmit Status Vector 0 register (TSV0 - address 0xFFE0 0158) bit description
Bit
Symbol
Function
Reset
value
0
CRC error
The attached CRC in the packet did not match the
internally generated CRC.
0
0
0
1
Length check error
Indicates the frame length field does not match the actual
number of data items and is not a type field.
2
1500 bytes.
3
4
5
6
Done
Transmission of packet was completed.
0
0
0
0
Multicast
Broadcast
Packet Defer
Packet’s destination was a multicast address.
Packet’s destination was a broadcast address.
Packet was deferred for at least one attempt, but less than
an excessive defer.
7
8
9
Excessive Defer
Excessive Collision
Late Collision
Packet was deferred in excess of 6071 nibble times in
100 Mbps or 24287 bit times in 10 Mbps mode.
0
0
0
Packet was aborted due to exceeding of maximum allowed
number of collisions.
Collision occurred beyond collision window, 512 bit times.
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Table 218. Transmit Status Vector 0 register (TSV0 - address 0xFFE0 0158) bit description
Bit
10
11
Symbol
Function
Reset
value
Giant
Byte count in frame was greater than can be represented
in the transmit byte count field in TSV1.
0
Underrun
Host side caused buffer underrun.
0
27:12 Total bytes
The total number of bytes transferred including collided
attempts.
0x0
28
29
Control frame
Pause
The frame was a control frame.
0
0
The frame was a control frame with a valid PAUSE
opcode.
30
31
Backpressure
VLAN
Carrier-sense method backpressure was previously
applied.
0
0
Frame’s length/type field contained 0x8100 which is the
VLAN protocol identifier.
[1] The EMAC doesn't distinguish the frame type and frame length, so, e.g. when the IP(0x8000) or
ARP(0x0806) packets are received, it compares the frame type with the max length and gives the "Length
out of range" error. In fact, this bit is not an error indication, but simply a statement by the chip regarding the
status of the received frame.
7.2.14 Transmit Status Vector 1 Register (TSV1 - 0xFFE0 015C)
The Transmit Status Vector 1 register (TSV1) is a Read Only register with an address of
0xFFE0 015C. The transmit status vector registers store the most recent transmit status
returned by the MAC. Since the status vector consists of more than 4 bytes, status is
distributed over two registers TSV0 and TSV1. These registers are provided for debug
purposes, because the communication between driver software and the Ethernet block
takes place primarily through the frame descriptors. The status register contents are valid
as long as the internal status of the MAC is valid and should typically only be read when
TSV1 register.
Table 219. Transmit Status Vector 1 register (TSV1 - address 0xFFE0 015C) bit description
Bit
Symbol
Function
Reset
value
15:0
Transmit byte count
The total number of bytes in the frame, not counting the
collided bytes.
0x0
19:16 Transmit collision
count
Number of collisions the current packet incurred during
transmission attempts. The maximum number of collisions
(16) cannot be represented.
0x0
31:20
-
Unused
0x0
7.2.15 Receive Status Vector Register (RSV - 0xFFE0 0160)
The Receive status vector register (RSV) is a Read Only register with an address of
0xFFE0 0160. The receive status vector register stores the most recent receive status
returned by the MAC. This register is provided for debug purposes, because the
communication between driver software and the Ethernet block takes place primarily
through the frame descriptors. The status register contents are valid as long as the
internal status of the MAC is valid and should typically only be read when the transmit and
receive processes are halted.
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Table 220. Receive Status Vector register (RSV - address 0xFFE0 0160) bit description
Bit
Symbol
Function
Reset
value
15:0
16
Received byte count Indicates length of received frame.
0x0
0
Packet previously
ignored
Indicates that a packet was dropped.
17
18
19
20
21
22
RXDV event
previously seen
Indicates that the last receive event seen was not long
enough to be a valid packet.
0
0
0
0
0
0
Carrier event
previously seen
Indicates that at some time since the last receive statistics,
a carrier event was detected.
Receive code
violation
Indicates that MII data does not represent a valid receive
code.
CRC error
The attached CRC in the packet did not match the
internally generated CRC.
Length check error
Indicates the frame length field does not match the actual
number of data items and is not a type field.
1518 bytes.
23
24
25
26
Receive OK
Multicast
The packet had valid CRC and no symbol errors.
The packet destination was a multicast address.
The packet destination was a broadcast address.
0
0
0
0
Broadcast
Dribble Nibble
Indicates that after the end of packet another 1-7 bits were
received. A single nibble, called dribble nibble, is formed
but not sent out.
27
28
Control frame
PAUSE
The frame was a control frame.
0
0
The frame was a control frame with a valid PAUSE
opcode.
29
30
31
Unsupported Opcode The current frame was recognized as a Control Frame but
contains an unknown opcode.
0
VLAN
Frame’s length/type field contained 0x8100 which is the
VLAN protocol identifier.
0
-
Unused
0x0
[1] The EMAC doesn't distinguish the frame type and frame length, so, e.g. when the IP(0x8000) or
ARP(0x0806) packets are received, it compares the frame type with the max length and gives the "Length
out of range" error. In fact, this bit is not an error indication, but simply a statement by the chip regarding the
status of the received frame.
7.2.16 Flow Control Counter Register (FlowControlCounter - 0xFFE0 0170)
The Flow Control Counter register (FlowControlCounter) has an address of 0xFFE0 0170.
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Table 221. Flow Control Counter register (FlowControlCounter - address 0xFFE0 0170) bit
description
Bit
Symbol
Function
Reset
value
15:0
MirrorCounter
In full duplex mode the MirrorCounter specifies the number 0x0
of cycles before re-issuing the Pause control frame.
31:16 PauseTimer
In full-duplex mode the PauseTimer specifies the value
that is inserted into the pause timer field of a pause flow
control frame. In half duplex mode the PauseTimer
specifies the number of backpressure cycles.
0x0
7.2.17 Flow Control Status Register (FlowControlStatus - 0xFFE0 0174)
The Flow Control Status register (FlowControlStatus) is a Read Only register with an
Table 222. Flow Control Status register (FlowControlStatus - address 0xFFE0 8174) bit
description
Bit
Symbol
Function
Reset
value
15:0
MirrorCounterCurrent In full duplex mode this register represents the current
value of the datapath’s mirror counter which counts up to
the value specified by the MirrorCounter field in the
FlowControlCounter register. In half duplex mode the
register counts until it reaches the value of the PauseTimer
bits in the FlowControlCounter register.
0x0
0x0
31:16
-
Unused
7.3 Receive filter register definitions
7.3.1 Receive Filter Control Register (RxFilterCtrl - 0xFFE0 0200)
The Receive Filter Control register (RxFilterCtrl) has an address of 0xFFE0 0200.
Table 223. Receive Filter Control register (RxFilterCtrl - address 0xFFE0 0200) bit
description
Bit
Symbol
Function
Reset
value
0
1
2
3
AcceptUnicastEn
When set to ’1’, all unicast frames are accepted.
When set to ’1’, all broadcast frames are accepted.
When set to ’1’, all multicast frames are accepted.
0
0
0
0
AcceptBroadcastEn
AcceptMulticastEn
AcceptUnicastHashEn
When set to ’1’, unicast frames that pass the imperfect
hash filter are accepted.
4
5
AcceptMulticastHashEn
AcceptPerfectEn
When set to ’1’, multicast frames that pass the
imperfect hash filter are accepted.
0
0
When set to ’1’, the frames with a destination address
identical to the
station address are accepted.
11:6
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
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Table 223. Receive Filter Control register (RxFilterCtrl - address 0xFFE0 0200) bit
description
Bit
12
13
Symbol
Function
Reset
value
MagicPacketEnWoL
RxFilterEnWoL
When set to ’1’, the result of the magic packet filter will
generate a WoL interrupt when there is a match.
0
When set to ’1’, the result of the perfect address
matching filter and the imperfect hash filter will
generate a WoL interrupt when there is a match.
0
31:14 -
Unused
0x0
7.3.2 Receive Filter WoL Status Register (RxFilterWoLStatus - 0xFFE0 0204)
The Receive Filter Wake-up on LAN Status register (RxFilterWoLStatus) is a Read Only
register with an address of 0xFFE0 0204.
Table 224. Receive Filter WoL Status register (RxFilterWoLStatus - address 0xFFE0 0204) bit
description
Bit Symbol
Function
Reset
value
0
1
2
3
AcceptUnicastWoL
When the value is ’1’, a unicast frames caused WoL.
When the value is ’1’, a broadcast frame caused WoL.
When the value is ’1’, a multicast frame caused WoL.
0
0
0
0
AcceptBroadcastWoL
AcceptMulticastWoL
AcceptUnicastHashWoL When the value is ’1’, a unicast frame that passes the
imperfect hash filter caused WoL.
4
5
AcceptMulticastHashWoL When the value is ’1’, a multicast frame that passes the
imperfect hash filter caused WoL.
0
0
AcceptPerfectWoL
When the value is ’1’, the perfect address matching filter
caused WoL.
6
7
8
-
Unused
0x0
0
RxFilterWoL
When the value is ’1’, the receive filter caused WoL.
MagicPacketWoL
When the value is ’1’, the magic packet filter caused
WoL.
0
31:9 -
Unused
0x0
The bits in this register record the cause for a WoL. Bits in RxFilterWoLStatus can be
cleared by writing the RxFilterWoLClear register.
7.3.3 Receive Filter WoL Clear Register (RxFilterWoLClear - 0xFFE0 0208)
The Receive Filter Wake-up on LAN Clear register (RxFilterWoLClear) is a Write Only
register with an address of 0xFFE0 0208.
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Table 225. Receive Filter WoL Clear register (RxFilterWoLClear - address 0xFFE0 0208) bit
description
Bit Symbol
Function
Reset
value
0
1
2
3
4
5
6
7
8
AcceptUnicastWoLClr
When a ’1’ is written to one of these bits (0 to 5), the
corresponding status bit in the RxFilterWoLStatus
register is cleared.
0
AcceptBroadcastWoLClr
AcceptMulticastWoLClr
AcceptUnicastHashWoLClr
AcceptMulticastHashWoLClr
AcceptPerfectWoLClr
-
0
0
0
0
0
Unused
0x0
0
RxFilterWoLClr
When a ’1’ is written to one of these bits (7 and/or 8),
the corresponding status bit in the RxFilterWoLStatus
register is cleared.
MagicPacketWoLClr
0
31:9 -
Unused
0x0
The bits in this register are write-only; writing resets the corresponding bits in the
RxFilterWoLStatus register.
7.3.4 Hash Filter Table LSBs Register (HashFilterL - 0xFFE0 0210)
The Hash Filter table LSBs register (HashFilterL) has an address of 0xFFE0 0210.
Table 226. Hash Filter Table LSBs register (HashFilterL - address 0xFFE0 0210) bit
description
Bit
Symbol
Function
Reset
value
31:0
HashFilterL
Bit 31:0 of the imperfect filter hash table for receive
filtering.
0x0
7.3.5 Hash Filter Table MSBs Register (HashFilterH - 0xFFE0 0214)
The Hash Filter table MSBs register (HashFilterH) has an address of 0xFFE0 0214.
Table 227. Hash Filter MSBs register (HashFilterH - address 0xFFE0 0214) bit description
Bit
Symbol
Function
Reset
value
31:0
HashFilterH
Bit 63:32 of the imperfect filter hash table for receive
filtering.
0x0
7.4 Module control register definitions
7.4.1 Interrupt Status Register (IntStatus - 0xFFE0 0FE0)
The Interrupt Status register (IntStatus) is a Read Only register with an address of
that all bits are flip-flops with an asynchronous set in order to be able to generate
interrupts if there are wake-up events while clocks are disabled.
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Table 228. Interrupt Status register (IntStatus - address 0xFFE0 0FE0) bit description
Bit
Symbol
Function
Reset
value
0
RxOverrunInt Interrupt set on a fatal overrun error in the receive queue. The
fatal interrupt should be resolved by a Rx soft-reset. The bit is not
set when there is a nonfatal overrun error.
0
1
2
RxErrorInt
Interrupt trigger on receive errors: AlignmentError, RangeError,
LengthError, SymbolError, CRCError or NoDescriptor or Overrun.
0
0
RxFinishedInt Interrupt triggered when all receive descriptors have been
processed i.e. on the transition to the situation where
ProduceIndex == ConsumeIndex.
3
4
RxDoneInt
Interrupt triggered when a receive descriptor has been processed
while the Interrupt bit in the Control field of the descriptor was set.
0
0
TxUnderrunInt Interrupt set on a fatal underrun error in the transmit queue. The
fatal interrupt should be resolved by a Tx soft-reset. The bit is not
set when there is a nonfatal underrun error.
5
6
7
TxErrorInt
Interrupt trigger on transmit errors: LateCollision,
ExcessiveCollision and ExcessiveDefer, NoDescriptor or
Underrun.
0
0
0
TxFinishedInt Interrupt triggered when all transmit descriptors have been
processed i.e. on the transition to the situation where
ProduceIndex == ConsumeIndex.
TxDoneInt
Interrupt triggered when a descriptor has been transmitted while
the Interrupt bit in the Control field of the descriptor was set.
11:8
12
-
Unused
0x0
0
SoftInt
Interrupt triggered by software writing a 1 to the SoftintSet bit in
the IntSet register.
13
WakeupInt
-
Interrupt triggered by a Wakeup event detected by the receive
filter.
0
31:14
Unused
0x0
The interrupt status register is read-only. Setting can be done via the IntSet register. Reset
can be accomplished via the IntClear register.
7.4.2 Interrupt Enable Register (IntEnable - 0xFFE0 0FE4)
The Interrupt Enable register (IntEnable) has an address of 0xFFE0 0FE4. The interrupt
Table 229. Interrupt Enable register (intEnable - address 0xFFE0 0FE4) bit description
Bit
Symbol
Function
Reset
value
0
RxOverrunIntEn Enable for interrupt trigger on receive buffer overrun or
descriptor underrun situations.
0
1
2
RxErrorIntEn
Enable for interrupt trigger on receive errors.
0
0
RxFinishedIntEn Enable for interrupt triggered when all receive descriptors have
been processed i.e. on the transition to the situation where
ProduceIndex == ConsumeIndex.
3
RxDoneIntEn
Enable for interrupt triggered when a receive descriptor has
been processed while the Interrupt bit in the Control field of the
descriptor was set.
0
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Table 229. Interrupt Enable register (intEnable - address 0xFFE0 0FE4) bit description
Bit
Symbol
Function
Reset
value
4
TxUnderrunIntEn Enable for interrupt trigger on transmit buffer or descriptor
underrun situations.
0
5
6
TxErrorIntEn
Enable for interrupt trigger on transmit errors.
0
0
TxFinishedIntEn Enable for interrupt triggered when all transmit descriptors
have been processed i.e. on the transition to the situation
where ProduceIndex == ConsumeIndex.
7
TxDoneIntEn
Enable for interrupt triggered when a descriptor has been
transmitted while the Interrupt bit in the Control field of the
descriptor was set.
0
11:8
12
-
Unused
0x0
0
SoftIntEn
Enable for interrupt triggered by the SoftInt bit in the IntStatus
register, caused by software writing a 1 to the SoftIntSet bit in
the IntSet register.
13
WakeupIntEn
-
Enable for interrupt triggered by a Wakeup event detected by
the receive filter.
0
31:14
Unused
0x0
7.4.3 Interrupt Clear Register (IntClear - 0xFFE0 0FE8)
The Interrupt Clear register (IntClear) is a Write Only register with an address of
Table 230. Interrupt Clear register (IntClear - address 0xFFE0 0FE8) bit description
Bit
Symbol
Function
Reset
value
0
RxOverrunIntClr
RxErrorIntClr
RxFinishedIntClr
RxDoneIntClr
TxUnderrunIntClr
TxErrorIntClr
TxFinishedIntClr
TxDoneIntClr
-
Writing a ’1’ to one of these bits clears (0 to 7) the
corresponding status bit in interrupt status register
IntStatus.
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
11:8
12
13
Unused
0x0
0
SoftIntClr
Writing a ’1’ to one of these bits (12 and/or 13) clears the
corresponding status bit in interrupt status register
IntStatus.
WakeupIntClr
0
31:14
-
Unused
0x0
The interrupt clear register is write-only. Writing a 1 to a bit of the IntClear register clears
the corresponding bit in the status register. Writing a 0 will not affect the interrupt status.
7.4.4 Interrupt Set Register (IntSet - 0xFFE0 0FEC)
The Interrupt Set register (IntSet) is a Write Only register with an address of
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Table 231. Interrupt Set register (IntSet - address 0xFFE0 0FEC) bit description
Bit
Symbol
Function
Reset
value
0
RxOverrunIntSet
RxErrorIntSet
RxFinishedIntSet
RxDoneIntSet
TxUnderrunIntSet
TxErrorIntSet
TxFinishedIntSet
TxDoneIntSet
-
Writing a ’1’ to one of these bits (0 to 7) sets the
corresponding status bit in interrupt status register
IntStatus.
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
11:8
12
13
Unused
0x0
0
SoftIntSet
Writing a ’1’ to one of these bits (12 and/or 13) sets the
corresponding status bit in interrupt status register
IntStatus.
WakeupIntSet
0
31:14
-
Unused
0x0
The interrupt set register is write-only. Writing a 1 to a bit of the IntSet register sets the
corresponding bit in the status register. Writing a 0 will not affect the interrupt status.
7.4.5 Power Down Register (PowerDown - 0xFFE0 0FF4)
The Power-Down register (PowerDown) is used to block all AHB accesses except
accesses to the PowerDown register. The register has an address of 0xFFE0 0FF4. The
Table 232. Power Down register (PowerDown - address 0xFFE0 0FF4) bit description
Bit
Symbol
Function
Reset
value
30:0
31
-
Unused
0x0
0
PowerDownMACAHB If true, all AHB accesses will return a read/write error,
except accesses to the PowerDown register.
Setting the bit will return an error on all read and write accesses on the MACAHB interface
except for accesses to the PowerDown register.
8. Descriptor and status formats
This section defines the descriptor format for the transmit and receive scatter/gather DMA
engines. Each Ethernet frame can consist of one or more fragments. Each fragment
corresponds to a single descriptor. The DMA managers in the Ethernet block scatter (for
receive) and gather (for transmit) multiple fragments for a single Ethernet frame.
8.1 Receive descriptors and statuses
Figure 11–28 depicts the layout of the receive descriptors in memory.
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RxDescriptor
RxStatus
PACKET
StatusInfo
DATA BUFFER
DATA BUFFER
1
2
3
4
5
CONTROL
PACKET
StatusHashCRC
StatusInfo
CONTROL
PACKET
StatusHashCRC
StatusInfo
DATA BUFFER
DATA BUFFER
CONTROL
PACKET
StatusHashCRC
StatusInfo
CONTROL
PACKET
StatusHashCRC
StatusInfo
DATA BUFFER
CONTROL
StatusHashCRC
PACKET
DATA BUFFER
StatusInfo
RxDescriptorNumber
CONTROL
StatusHashCRC
Fig 28. Receive descriptor memory layout
Receive descriptors are stored in an array in memory. The base address of the array is
stored in the RxDescriptor register, and should be aligned on a 4 byte address boundary.
The number of descriptors in the array is stored in the RxDescriptorNumber register using
a minus one encoding style e.g. if the array has 8 elements the register value should be 7.
Parallel to the descriptors there is an array of statuses. For each element of the descriptor
array there is an associated status field in the status array. The base address of the status
array is stored in the RxStatus register, and must be aligned on an 8 byte address
boundary. During operation (when the receive datapath is enabled) the RxDescriptor,
RxStatus and RxDescriptorNumber registers should not be modified.
Two registers, RxConsumeIndex and RxProduceIndex, define the descriptor locations
that will be used next by hardware and software. Both registers act as counters starting at
0 and wrapping when they reach the value of RxDescriptorNumber. The RxProduceIndex
contains the index of the descriptor that is going to be filled with the next frame being
received. The RxConsumeIndex is programmed by software and is the index of the next
descriptor that the software receive driver is going to process. When RxProduceIndex ==
RxConsumeIndex, the receive buffer is empty. When RxProduceIndex ==
RxConsumeIndex -1 (taking wraparound into account), the receive buffer is full and newly
received data would generate an overflow unless the software driver frees up one or more
descriptors.
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Each receive descriptor takes two word locations (8 bytes) in memory. Likewise each
status field takes two words (8 bytes) in memory. Each receive descriptor consists of a
pointer to the data buffer for storing receive data (Packet) and a control word (Control).
The Packet field has a zero address offset, the control field has a 4 byte address offset
Table 233. Receive Descriptor Fields
Symbol
Address Bytes Description
offset
Packet
Control
0x0
0x4
4
4
Base address of the data buffer for storing receive data.
The data buffer pointer (Packet) is a 32 bits byte aligned address value containing the
base address of the data buffer. The definition of the control word bits is listed in
Table 234. Receive Descriptor Control Word
Bit
Symbol
Description
10:0 Size
Size in bytes of the data buffer. This is the size of the buffer reserved by the
device driver for a frame or frame fragment i.e. the byte size of the buffer
pointed to by the Packet field. The size is -1 encoded e.g. if the buffer is 8
bytes the size field should be equal to 7.
30:11
31
-
Unused
Interrupt
If true generate an RxDone interrupt when the data in this frame or frame
fragment and the associated status information has been committed to
memory.
Table 235. Receive Status Fields
Symbol
Address Bytes Description
offset
StatusInfo
0x0
4
4
StatusHashCRC 0x4
The concatenation of the destination address hash CRC and
the source address hash CRC.
Each receive status consists of two words. The StatusHashCRC word contains a
concatenation of the two 9 bit hash CRCs calculated from the destination and source
addresses contained in the received frame. After detecting the destination and source
addresses, StatusHashCRC is calculated once, then held for every fragment of the same
frame.
Table 236. Receive Status HashCRC Word
Bit
Symbol
SAHashCRC Hash CRC calculated from the source address.
Unused
Description
8:0
15:9
-
24:16 DAHashCRC Hash CRC calculated from the destination address.
31:25 -
Unused
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The StatusInfo word contains flags returned by the MAC and flags generated by the
in the StatusInfo word.
Table 237. Receive status information word
Bit
Symbol
Description
10:0 RxSize
The size in bytes of the actual data transferred into one fragment buffer. In
other words, this is the size of the frame or fragment as actually written by
the DMA manager for one descriptor. This may be different from the Size
bits of the Control field in the descriptor that indicate the size of the buffer
allocated by the device driver. Size is -1 encoded e.g. if the buffer has
8 bytes the RxSize value will be 7.
17:11 -
Unused
18
ControlFrame Indicates this is a control frame for flow control, either a pause frame or a
frame with an unsupported opcode.
19
20
VLAN
Indicates a VLAN frame.
FailFilter
Indicates this frame has failed the Rx filter. These frames will not normally
pass to memory. But due to the limitation of the size of the buffer, part of
this frame may already be passed to memory. Once the frame is found to
have failed the Rx filter, the remainder of the frame will be discarded
without being passed to the memory. However, if the PassRxFilter bit in
the Command register is set, the whole frame will be passed to memory.
21
22
23
24
25
Multicast
Set when a multicast frame is received.
Broadcast
CRCError
SymbolError
LengthError
Set when a broadcast frame is received.
The received frame had a CRC error.
The PHY reports a bit error over the MII during reception.
The frame length field value in the frame specifies a valid length, but does
not match the actual data length.
26
27
AlignmentError An alignment error is flagged when dribble bits are detected and also a
CRC error is detected. This is in accordance with IEEE std. 802.3/clause
4.3.2.
28
29
Overrun
Receive overrun. The adapter can not accept the data stream.
NoDescriptor
No new Rx descriptor is available and the frame is too long for the buffer
size in the current receive descriptor.
30
31
LastFlag
Error
When set to 1, indicates this descriptor is for the last fragment of a frame.
If the frame consists of a single fragment, this bit is also set to 1.
An error occurred during reception of this frame. This is a logical OR of
AlignmentError, RangeError, LengthError, SymbolError, CRCError, and
Overrun.
[1] The EMAC doesn't distinguish the frame type and frame length, so, e.g. when the IP(0x8000) or
ARP(0x0806) packets are received, it compares the frame type with the max length and gives the "Range"
error. In fact, this bit is not an error indication, but simply a statement by the chip regarding the status of the
received frame.
For multi-fragment frames, the value of the AlignmentError, RangeError, LengthError,
SymbolError and CRCError bits in all but the last fragment in the frame will be 0; likewise
the value of the FailFilter, Multicast, Broadcast, VLAN and ControlFrame bits is undefined.
The status of the last fragment in the frame will copy the value for these bits from the
MAC. All fragment statuses will have valid LastFrag, RxSize, Error, Overrun and
NoDescriptor bits.
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8.2 Transmit descriptors and statuses
Figure 11–29 depicts the layout of the transmit descriptors in memory.
TxDescriptor
TxStatus
PACKET
DATA BUFFER
DATA BUFFER
1
2
3
4
5
StatusInfo
StatusInfo
StatusInfo
StatusInfo
StatusInfo
CONTROL
PACKET
CONTROL
PACKET
DATA BUFFER
DATA BUFFER
CONTROL
PACKET
CONTROL
PACKET
DATA BUFFER
CONTROL
PACKET
DATA BUFFER
TxDescriptorNumber
StatusInfo
CONTROL
Fig 29. Transmit descriptor memory layout
Transmit descriptors are stored in an array in memory. The lowest address of the transmit
descriptor array is stored in the TxDescriptor register, and must be aligned on a 4 byte
address boundary. The number of descriptors in the array is stored in the
TxDescriptorNumber register using a minus one encoding style i.e. if the array has 8
elements the register value should be 7. Parallel to the descriptors there is an array of
statuses. For each element of the descriptor array there is an associated status field in the
status array. The base address of the status array is stored in the TxStatus register, and
must be aligned on a 4 byte address boundary. During operation (when the transmit
datapath is enabled) the TxDescriptor, TxStatus, and TxDescriptorNumber registers
should not be modified.
Two registers, TxConsumeIndex and TxProduceIndex, define the descriptor locations that
will be used next by hardware and software. Both register act as counters starting at 0 and
wrapping when they reach the value of TxDescriptorNumber. The TxProduceIndex
contains the index of the next descriptor that is going to be filled by the software driver.
The TxConsumeIndex contains the index of the next descriptor going to be transmitted by
the hardware. When TxProduceIndex == TxConsumeIndex, the transmit buffer is empty.
When TxProduceIndex == TxConsumeIndex -1 (taking wraparound into account), the
transmit buffer is full and the software driver cannot add new descriptors until the
hardware has transmitted one or more frames to free up descriptors.
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Each transmit descriptor takes two word locations (8 bytes) in memory. Likewise each
status field takes one word (4 bytes) in memory. Each transmit descriptor consists of a
pointer to the data buffer containing transmit data (Packet) and a control word (Control).
The Packet field has a zero address offset, whereas the control field has a 4 byte address
Table 238. Transmit descriptor fields
Symbol Address offset
Bytes Description
Packet
Control
0x0
0x4
4
4
Base address of the data buffer containing transmit data.
The data buffer pointer (Packet) is a 32 bit, byte aligned address value containing the
base address of the data buffer. The definition of the control word bits is listed in
Table 239. Transmit descriptor control word
Bit
Symbol
Description
10:0 Size
Size in bytes of the data buffer. This is the size of the frame or fragment as it
needs to be fetched by the DMA manager. In most cases it will be equal to the
byte size of the data buffer pointed to by the Packet field of the descriptor. Size
is -1 encoded e.g. a buffer of 8 bytes is encoded as the Size value 7.
25:11
26
-
Unused
Override
Per frame override. If true, bits 30:27 will override the defaults from the MAC
internal registers. If false, bits 30:27 will be ignored and the default values
from the MAC will be used.
27
Huge
If true, enables huge frame, allowing unlimited frame sizes. When false,
prevents transmission of more than the maximum frame length (MAXF[15:0]).
28
29
30
Pad
CRC
Last
If true, pad short frames to 64 bytes.
If true, append a hardware CRC to the frame.
If true, indicates that this is the descriptor for the last fragment in the transmit
frame. If false, the fragment from the next descriptor should be appended.
31
Interrupt
If true, a TxDone interrupt will be generated when the data in this frame or
frame fragment has been sent and the associated status information has been
committed to memory.
Table 240. Transmit status fields
Symbol
Address
offset
Bytes
Description
StatusInfo
0x0
4
The transmit status consists of one word which is the StatusInfo word. It contains flags
returned by the MAC and flags generated by the transmit datapath reflecting the status of
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Table 241. Transmit status information word
Bit
Symbol
Description
20:0
-
Unused
24:21 CollisionCount
The number of collisions this packet incurred, up to the
Retransmission Maximum.
25
26
27
Defer
This packet incurred deferral, because the medium was occupied.
This is not an error unless excessive deferral occurs.
ExcessiveDefer
This packet incurred deferral beyond the maximum deferral limit and
was aborted.
ExcessiveCollision Indicates this packet exceeded the maximum collision limit and was
aborted.
28
29
LateCollision
Underrun
An Out of window Collision was seen, causing packet abort.
A Tx underrun occurred due to the adapter not producing transmit
data.
30
31
NoDescriptor
Error
The transmit stream was interrupted because a descriptor was not
available.
An error occurred during transmission. This is a logical OR of
Underrun, LateCollision, ExcessiveCollision, and ExcessiveDefer.
For multi-fragment frames, the value of the LateCollision, ExcessiveCollision,
ExcessiveDefer, Defer and CollissionCount bits in all but the last fragment in the frame will
be 0. The status of the last fragment in the frame will copy the value for these bits from the
MAC. All fragment statuses will have valid Error, NoDescriptor and Underrun bits.
9. Ethernet block functional description
This section defines the functions of the DMA capable 10/100 Ethernet MAC. After
introducing the DMA concepts of the Ethernet block, and a description of the basic
transmit and receive functions, this section elaborates on advanced features such as flow
control, receive filtering, etc.
9.1 Overview
The Ethernet block can transmit and receive Ethernet packets from an off-chip Ethernet
PHY connected through the MII or RMII interface. MII or RMII mode can be selected from
software.
Typically during system start-up, the Ethernet block will be initialized. Software
initialization of the Ethernet block should include initialization of the descriptor and status
arrays as well as the receiver fragment buffers.
To transmit a packet the software driver has to set up the appropriate Control registers
and a descriptor to point to the packet data buffer before transferring the packet to
hardware by incrementing the TxProduceIndex register. After transmission, hardware will
increment TxConsumeIndex and optionally generate an interrupt.
The hardware will receive packets from the PHY and apply filtering as configured by the
software driver. While receiving a packet the hardware will read a descriptor from memory
to find the location of the associated receiver data buffer. Receive data is written in the
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data buffer and receive status is returned in the receive descriptor status word. Optionally
an interrupt can be generated to notify software that a packet has been received. Note
that the DMA manager will prefetch and buffer up to three descriptors.
9.2 AHB interface
The registers of the Ethernet block connect to an AHB slave interface to allow access to
the registers from the CPU.
The AHB interface has a 32 bit data path, which supports only word accesses and has an
All AHB write accesses to registers are posted except for accesses to the IntSet, IntClear
and IntEnable registers. AHB write operations are executed in order.
If the PowerDown bit of the PowerDown register is set, all AHB read and write accesses
will return a read or write error except for accesses to the PowerDown register.
Bus Errors
The Ethernet block generates errors for several conditions:
• The AHB interface will return a read error when there is an AHB read access to a
write-only register; likewise a write error is returned when there is an AHB write
access to the read-only register. An AHB read or write error will be returned on AHB
read or write accesses to reserved registers. These errors are propagated back to the
• If the PowerDown bit is set all accesses to AHB registers will result in an error
response except for accesses to the PowerDown register.
9.3 Interrupts
The Ethernet block has a single interrupt request output to the CPU (via the Vectored
Interrupt Controller).
The interrupt service routine must read the IntStatus register to determine the origin of the
interrupt. All interrupt statuses can be set by software writing to the IntSet register;
statuses can be cleared by software writing to the IntClear register.
The transmit and receive datapaths can only set interrupt statuses, they cannot clear
statuses. The SoftInt interrupt cannot be set by hardware and can be used by software for
test purposes.
9.4 Direct Memory Access (DMA)
Descriptor arrays
The Ethernet block includes two DMA managers. The DMA managers make it possible to
transfer frames directly to and from memory with little support from the processor and
without the need to trigger an interrupt for each frame.
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The DMA managers work with arrays of frame descriptors and statuses that are stored in
memory. The descriptors and statuses act as an interface between the Ethernet hardware
and the device driver software. There is one descriptor array for receive frames and one
descriptor array for transmit frames. Using buffering for frame descriptors, the memory
traffic and memory bandwidth utilization of descriptors can be kept small.
Each frame descriptor contains two 32 bit fields: the first field is a pointer to a data buffer
containing a frame or a fragment, whereas the second field is a control word related to
that frame or fragment.
The software driver must write the base addresses of the descriptor and status arrays in
the TxDescriptor/RxDescriptor and TxStatus/RxStatus registers. The number of
descriptors/statuses in each array must be written in the
TxDescriptorNumber/RxDescriptorNumber registers. The number of descriptors in an
array corresponds to the number of statuses in the associated status array.
Transmit descriptor arrays, receive descriptor arrays and transmit status arrays must be
aligned on a 4 byte (32bit)address boundary, while the receive status array must be
aligned on a 8 byte (64bit) address boundary.
Ownership of descriptors
Both device driver software and Ethernet hardware can read and write the descriptor
arrays at the same time in order to produce and consume descriptors. Arbitration on the
AHB bus gives priority to the DMA hardware in the case of simultaneous requests. A
descriptor is "owned" either by the device driver or by the Ethernet hardware. Only the
owner of a descriptor reads or writes its value. Typically, the sequence of use and
ownership of descriptors and statuses is as follows: a descriptor is owned and set up by
the device driver; ownership of the descriptor/status is passed by the device driver to the
Ethernet block, which reads the descriptor and writes information to the status field; the
Ethernet block passes ownership of the descriptor back to the device driver, which uses
the status information and then recycles the descriptor to be used for another frame.
Software must pre-allocate the memory used to hold the descriptor arrays.
Software can hand over ownership of descriptors and statuses to the hardware by
incrementing (and wrapping if on the array boundary) the
TxProduceIndex/RxConsumeIndex registers. Hardware hands over descriptors and
status to software by updating the TxConsumeIndex/ RxProduceIndex registers.
After handing over a descriptor to the receive and transmit DMA hardware, device driver
software should not modify the descriptor or reclaim the descriptor by decrementing the
TxProduceIndex/ RxConsumeIndex registers because descriptors may have been
prefetched by the hardware. In this case the device driver software will have to wait until
the frame has been transmitted or the device driver has to soft-reset the transmit and/or
receive datapaths which will also reset the descriptor arrays.
Sequential order with wrap-around
When descriptors are read from and statuses are written to the arrays, this is done in
sequential order with wrap-around. Sequential order means that when the Ethernet block
has finished reading/writing a descriptor/status, the next descriptor/status it reads/writes is
the one at the next higher, adjacent memory address. Wrap around means that when the
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Ethernet block has finished reading/writing the last descriptor/status of the array (with the
highest memory address), the next descriptor/status it reads/writes is the first
descriptor/status of the array at the base address of the array.
Full and Empty state of descriptor arrays
The descriptor arrays can be empty, partially full or full. A descriptor array is empty when
all descriptors are owned by the producer. A descriptor array is partially full if both
producer and consumer own part of the descriptors and both are busy processing those
descriptors. A descriptor array is full when all descriptors (except one) are owned by the
consumer, so that the producer has no more room to process frames. Ownership of
descriptors is indicated with the use of a consume index and a produce index. The
produce index is the first element of the array owned by the producer. It is also the index
of the array element that is next going to be used by the producer of frames (it may
already be busy using it and subsequent elements). The consume index is the first
element of the array that is owned by the consumer. It is also the number of the array
element next to be consumed by the consumer of frames (it and subsequent elements
may already be in the process of being consumed). If the consume index and the produce
index are equal, the descriptor array is empty and all array elements are owned by the
producer. If the consume index equals the produce index plus one, then the array is full
and all array elements (except the one at the produce index) are owned by the consumer.
With a full descriptor array, still one array element is kept empty, to be able to easily
distinguish the full or empty state by looking at the value of the produce index and
consume index. An array must have at least 2 elements to be able to indicate a full
descriptor array with a produce index of value 0 and a consume index of value 1. The
wrap around of the arrays is taken into account when determining if a descriptor array is
full, so a produce index that indicates the last element in the array and a consume index
that indicates the first element in the array, also means the descriptor array is full. When
the produce index and the consume index are unequal and the consume index is not the
produce index plus one (with wrap around taken into account), then the descriptor array is
partially full and both the consumer and producer own enough descriptors to be able to
operate actively on the descriptor array.
Interrupt bit
The descriptors have an Interrupt bit, which is programmed by software. When the
Ethernet block is processing a descriptor and finds this bit set, it will allow triggering an
interrupt (after committing status to memory) by passing the RxDoneInt or TxDoneInt bits
in the IntStatus register to the interrupt output pin. If the Interrupt bit is not set in the
descriptor, then the RxDoneInt or TxDoneInt are not set and no interrupt is triggered (note
that the corresponding bits in IntEnable must also be set to trigger interrupts). This offers
flexible ways of managing the descriptor arrays. For instance, the device driver could add
10 frames to the Tx descriptor array, and set the Interrupt bit in descriptor number 5 in the
descriptor array. This would invoke the interrupt service routine before the transmit
descriptor array is completely exhausted. The device driver could add another batch of
frames to the descriptor array, without interrupting continuous transmission of frames.
Frame fragments
For maximum flexibility in frame storage, frames can be split up into multiple frame
fragments with fragments located in different places in memory. In this case one
descriptor is used for each frame fragment. So, a descriptor can point to a single frame or
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to a fragment of a frame. By using fragments, scatter/gather DMA can be done: transmit
frames are gathered from multiple fragments in memory and receive frames can be
scattered to multiple fragments in memory.
By stringing together fragments it is possible to create large frames from small memory
areas. Another use of fragments is to be able to locate a frame header and frame payload
in different places and to concatenate them without copy operations in the device driver.
For transmissions, the Last bit in the descriptor Control field indicates if the fragment is the
last in a frame; for receive frames, the LastFrag bit in the StatusInfo field of the status
words indicates if the fragment is the last in the frame. If the Last(Frag) bit is 0 the next
descriptor belongs to the same Ethernet frame, If the Last(Frag) bit is 1 the next descriptor
is a new Ethernet frame.
9.5 Initialization
After reset, the Ethernet software driver needs to initialize the Ethernet block. During
initialization the software needs to:
• Remove the soft reset condition from the MAC
• Configure the PHY via the MIIM interface of the MAC
• Select RMII or MII mode
• Configure the transmit and receive DMA engines, including the descriptor arrays
• Configure the host registers (MAC1,MAC2 etc.) in the MAC
• Enable the receive and transmit datapaths
Depending on the PHY, the software needs to initialize registers in the PHY via the MII
Management interface. The software can read and write PHY registers by programming
the MCFG, MCMD, MADR registers of the MAC. Write data should be written to the
MWTD register; read data and status information can be read from the MRDD and MIND
registers.
The Ethernet block supports RMII and MII PHYs. During initialization software must select
MII or RMII mode by programming the Command register. After initialization, the RMII or
MII mode should not be modified.
Before switching to RMII mode the default soft reset (MAC1 register bit 15) has to be
deasserted when the Ethernet block is in MII mode . The phy_tx_clk and phy_rx_clk are
necessary during this operation. In case an RMII PHY is used (which does not provide
these clock signals), phy_tx_clk and phy_rx_clk can be connected to the phy_ref_clk.
Transmit and receive DMA engines should be initialized by the device driver by allocating
the descriptor and status arrays in memory. Transmit and receive functions have their own
dedicated descriptor and status arrays. The base addresses of these arrays need to be
programmed in the TxDescriptor/TxStatus and RxDescriptor/RxStatus registers. The
number of descriptors in an array matches the number of statuses in an array.
Please note that the transmit descriptors, receive descriptors and receive statuses are 8
bytes each while the transmit statuses are 4 bytes each. All descriptor arrays and transmit
statuses need to be aligned on 4 byte boundaries; receive status arrays need to be
aligned on 8 byte boundaries. The number of descriptors in the descriptor arrays needs to
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be written to the TxDescriptorNumber/RxDescriptorNumber registers using a -1 encoding
i.e. the value in the registers is the number of descriptors minus one e.g. if the descriptor
array has 4 descriptors the value of the number of descriptors register should be 3.
After setting up the descriptor arrays, frame buffers need to be allocated for the receive
descriptors before enabling the receive datapath. The Packet field of the receive
descriptors needs to be filled with the base address of the frame buffer of that descriptor.
Amongst others the Control field in the receive descriptor needs to contain the size of the
data buffer using -1 encoding.
The receive datapath has a configurable filtering function for discarding/ignoring specific
Ethernet frames. The filtering function should also be configured during initialization.
After an assertion of the hardware reset, the soft reset bit in the MAC will be asserted. The
soft reset condition must be removed before the Ethernet block can be enabled.
Enabling of the receive function is located in two places. The receive DMA manager
needs to be enabled and the receive datapath of the MAC needs to be enabled. To
prevent overflow in the receive DMA engine the receive DMA engine should be enabled
by setting the RxEnable bit in the Command register before enabling the receive datapath
in the MAC by setting the RECEIVE ENABLE bit in the MAC1 register.
The transmit DMA engine can be enabled at any time by setting the TxEnable bit in the
Command register.
Before enabling the datapaths, several options can be programmed in the MAC, such as
automatic flow control, transmit to receive loop-back for verification, full/half duplex
modes, etc.
Base addresses of descriptor arrays and descriptor array sizes cannot be modified
without a (soft) reset of the receive and transmit datapaths.
9.6 Transmit process
Overview
This section outlines the transmission process.
Device driver sets up descriptors and data
If the descriptor array is full the device driver should wait for the descriptor arrays to
become not full before writing to a descriptor in the descriptor array. If the descriptor array
is not full, the device driver should use the descriptor numbered TxProduceIndex of the
array pointed to by TxDescriptor.
The Packet pointer in the descriptor is set to point to a data frame or frame fragment to be
transmitted. The Size field in the Command field of the descriptor should be set to the
number of bytes in the fragment buffer, -1 encoded. Additional control information can be
indicated in the Control field in the descriptor (bits Interrupt, Last, CRC, Pad).
After writing the descriptor the descriptor needs to be handed over to the hardware by
incrementing (and possibly wrapping) the TxProduceIndex register.
If the transmit datapath is disabled, the device driver should not forget to enable the
transmit datapath by setting the TxEnable bit in the Command register.
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When there is a multi-fragment transmission for fragments other than the last, the Last bit
in the descriptor must be set to 0; for the last fragment the Last bit must be set to 1. To
trigger an interrupt when the frame has been transmitted and transmission status has
been committed to memory, set the Interrupt bit in the descriptor Control field to 1. To have
the hardware add a CRC in the frame sequence control field of this Ethernet frame, set
the CRC bit in the descriptor. This should be done if the CRC has not already been added
by software. To enable automatic padding of small frames to the minimum required frame
size, set the Pad bit in the Control field of the descriptor to 1. In typical applications bits
CRC and Pad are both set to 1.
The device driver can set up interrupts using the IntEnable register to wait for a signal of
completion from the hardware or can periodically inspect (poll) the progress of
transmission. It can also add new frames at the end of the descriptor array, while
hardware consumes descriptors at the start of the array.
The device driver can stop the transmit process by resetting the TxEnable bit in the
Command register to 0. The transmission will not stop immediately; frames already being
transmitted will be transmitted completely and the status will be committed to memory
before deactivating the datapath. The status of the transmit datapath can be monitored by
the device driver reading the TxStatus bit in the Status register.
As soon as the transmit datapath is enabled and the corresponding TxConsumeIndex and
TxProduceIndex are not equal i.e. the hardware still needs to process frames from the
descriptor array, the TxStatus bit in the Status register will return to 1 (active).
Tx DMA manager reads the Tx descriptor array
When the TxEnable bit is set, the Tx DMA manager reads the descriptors from memory at
the address determined by TxDescriptor and TxConsumeIndex. The number of
descriptors requested is determined by the total number of descriptors owned by the
hardware: TxProduceIndex - TxConsumeIndex. Block transferring descriptors minimizes
memory loading. Read data returned from memory is buffered and consumed as needed.
Tx DMA manager transmits data
After reading the descriptor the transmit DMA engine reads the associated frame data
from memory and transmits the frame. After transfer completion, the Tx DMA manager
writes status information back to the StatusInfo and StatusHashCRC words of the status
field. The value of the TxConsumeIndex is only updated after status information has been
committed to memory, which is checked by an internal tag protocol in the memory
interface. The Tx DMA manager continues to transmit frames until the descriptor array is
empty. If the transmit descriptor array is empty the TxStatus bit in the Status register will
return to 0 (inactive). If the descriptor array is empty the Ethernet hardware will set the
TxFinishedInt bit of the IntStatus register. The transmit datapath will still be enabled.
The Tx DMA manager inspects the Last bit of the descriptor Control field when loading the
descriptor. If the Last bit is 0, this indicates that the frame consists of multiple fragments.
The Tx DMA manager gathers all the fragments from the host memory, visiting a string of
frame descriptors, and sends them out as one Ethernet frame on the Ethernet connection.
When the Tx DMA manager finds a descriptor with the Last bit in the Control field set to 1,
this indicates the last fragment of the frame and thus the end of the frame is found.
Update ConsumeIndex
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Each time the Tx DMA manager commits a status word to memory it completes the
transmission of a descriptor and it increments the TxConsumeIndex (taking wrap around
into account) to hand the descriptor back to the device driver software. Software can
re-use the descriptor for new transmissions after hardware has handed it back.
The device driver software can keep track of the progress of the DMA manager by reading
the TxConsumeIndex register to see how far along the transmit process is. When the Tx
descriptor array is emptied completely, the TxConsumeIndex register retains its last value.
Write transmission status
After the frame has been transmitted over the (R)MII bus, the StatusInfo word of the frame
descriptor is updated by the DMA manager.
If the descriptor is for the last fragment of a frame (or for the whole frame if there are no
fragments), then depending on the success or failure of the frame transmission, error
flags (Error, LateCollision, ExcessiveCollision, Underrun, ExcessiveDefer, Defer) are set
in the status. The CollisionCount field is set to the number of collisions the frame incurred,
up to the Retransmission Maximum programmed in the Collision window/retry register of
the MAC.
Statuses for all but the last fragment in the frame will be written as soon as the data in the
frame has been accepted by the Tx DMA manager. Even if the descriptor is for a frame
fragment other than the last fragment, the error flags are returned via the AHB interface. If
the Ethernet block detects a transmission error during transmission of a (multi-fragment)
frame, all remaining fragments of the frame are still read via the AHB interface. After an
error, the remaining transmit data is discarded by the Ethernet block. If there are errors
during transmission of a multi-fragment frame the error statuses will be repeated until the
last fragment of the frame. Statuses for all but the last fragment in the frame will be written
as soon as the data in the frame has been accepted by the Tx DMA manager. These may
include error information if the error is detected early enough. The status for the last
fragment in the frame will only be written after the transmission has completed on the
Ethernet connection. Thus, the status for the last fragment will always reflect any error
that occurred anywhere in the frame.
The status of the last frame transmission can also be inspected by reading the TSV0 and
TSV1 registers. These registers do not report statuses on a fragment basis and do not
store information of previously sent frames. They are provided primarily for debug
purposes, because the communication between driver software and the Ethernet block
takes place through the frame descriptors. The status registers are valid as long as the
internal status of the MAC is valid and should typically only be read when the transmit and
receive processes are halted.
Transmission error handling
If an error occurs during the transmit process, the Tx DMA manager will report the error
via the transmission StatusInfo word written in the Status array and the IntStatus interrupt
status register.
The transmission can generate several types of errors: LateCollision, ExcessiveCollision,
ExcessiveDefer, Underrun, and NoDescriptor. All have corresponding bits in the
transmission StatusInfo word. In addition to the separate bits in the StatusInfo word,
LateCollision, ExcessiveCollision, and ExcessiveDefer are ORed together into the Error
bit of the Status. Errors are also propagated to the IntStatus register; the TxError bit in the
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IntStatus register is set in the case of a LateCollision, ExcessiveCollision, ExcessiveDefer,
or NoDescriptor error; Underrun errors are reported in the TxUnderrun bit of the IntStatus
register.
Underrun errors can have three causes:
• The next fragment in a multi-fragment transmission is not available. This is a nonfatal
error. A NoDescriptor status will be returned on the previous fragment and the TxError
bit in IntStatus will be set.
• The transmission fragment data is not available when the Ethernet block has already
started sending the frame. This is a nonfatal error. An Underrun status will be returned
on transfer and the TxError bit in IntStatus will be set.
• The flow of transmission statuses stalls and a new status has to be written while a
previous status still waits to be transferred across the memory interface. This is a fatal
error which can only be resolved by a soft reset of the hardware.
The first and second situations are nonfatal and the device driver has to resend the frame
or have upper software layers resend the frame. In the third case the hardware is in an
undefined state and needs to be soft reset by setting the TxReset bit in the Command
register.
After reporting a LateCollision, ExcessiveCollision, ExcessiveDefer or Underrun error, the
transmission of the erroneous frame will be aborted, remaining transmission data and
frame fragments will be discarded and transmission will continue with the next frame in
the descriptor array.
Device drivers should catch the transmission errors and take action.
Transmit triggers interrupts
The transmit datapath can generate four different interrupt types:
• If the Interrupt bit in the descriptor Control field is set, the Tx DMA will set the
TxDoneInt bit in the IntStatus register after sending the fragment and committing the
associated transmission status to memory. Even if a descriptor (fragment) is not the
last in a multi-fragment frame the Interrupt bit in the descriptor can be used to
generate an interrupt.
• If the descriptor array is empty while the Ethernet hardware is enabled the hardware
will set the TxFinishedInt bit of the IntStatus register.
• If the AHB interface does not consume the transmission statuses at a sufficiently high
bandwidth the transmission may underrun in which case the TxUnderrun bit will be set
in the IntStatus register. This is a fatal error which requires a soft reset of the
transmission queue.
• In the case of a transmission error (LateCollision, ExcessiveCollision, or
ExcessiveDefer) or a multi-fragment frame where the device driver did provide the
initial fragments but did not provide the rest of the fragments (NoDescriptor) or in the
case of a nonfatal overrun, the hardware will set the TxErrorInt bit of the IntStatus
register.
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All of the above interrupts can be enabled and disabled by setting or resetting the
corresponding bits in the IntEnable register. Enabling or disabling does not affect the
IntStatus register contents, only the propagation of the interrupt status to the CPU (via the
Vectored Interrupt Controller).
The interrupts, either of individual frames or of the whole list, are a good means of
communication between the DMA manager and the device driver, triggering the device
driver to inspect the status words of descriptors that have been processed.
Transmit example
Figure 11–30 illustrates the transmit process in an example transmitting uses a frame
header of 8 bytes and a frame payload of 12 bytes.
TxDescriptor
0x7FE010EC
TxStatus
0x7FE011F8
PACKET 0 HEADER(8 bytes)
0x7FE011F8
0x7FE010EC
Packet
0x7FE01314
StatusInfo
0x7FE010F0
0x7FE010F4
0x7FE010F8
0x7FE011FC
CONTROL
0 0
7
StatusInfo
StatusInfo
StatusInfo
PACKET 0 PAYLOAD(12 bytes)
Packet
0x7FE01411
0x7FE01200
0x7FE01204
0 0 CONTROL 7
Packet
0x7FE01419
0x7FE010FC
0x7FE0100
0x7FE0104
0x7FE01108
1 1 CONTROL 3
TxProduceIndex
TxConsumeIndex
PACKET 1 HEADER (8 bytes)
Packet
0x7FE01324
TxDescriptorNumber
= 3
CONTROL 7
0 0
descriptor array
fragment buffers
status array
Fig 30. Transmit example memory and registers
After reset the values of the DMA registers will be zero. During initialization the device
driver will allocate the descriptor and status array in memory. In this example, an array of
four descriptors is allocated; the array is 4x2x4 bytes and aligned on a 4 byte address
boundary. Since the number of descriptors matches the number of statuses the status
array consists of four elements; the array is 4x1x4 bytes and aligned on a 4 byte address
boundary. The device driver writes the base address of the descriptor array
(0x7FE0 10EC) to the TxDescriptor register and the base address of the status array
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(0x7FE0 11F8) to the TxStatus register. The device driver writes the number of descriptors
and statuses minus 1(3) to the TxDescriptorNumber register. The descriptors and
statuses in the arrays need not be initialized, yet.
At this point, the transmit datapath may be enabled by setting the TxEnable bit in the
Command register. If the transmit datapath is enabled while there are no further frames to
send the TxFinishedInt interrupt flag will be set. To reduce the processor interrupt load
only the desired interrupts can be enabled by setting the relevant bits in the IntEnable
register.
Now suppose application software wants to transmit a frame of 12 bytes using a TCP/IP
protocol (in real applications frames will be larger than 12 bytes). The TCP/IP stack will
add a header to the frame. The frame header need not be immediately in front of the
payload data in memory. The device driver can program the Tx DMA to collect header and
payload data. To do so, the device driver will program the first descriptor to point at the
frame header; the Last flag in the descriptor will be set to false/0 to indicate a
multi-fragment transmission. The device driver will program the next descriptor to point at
the actual payload data. The maximum size of a payload buffer is 2 kB so a single
descriptor suffices to describe the payload buffer. For the sake of the example though the
payload is distributed across two descriptors. After the first descriptor in the array
describing the header, the second descriptor in the array describes the initial 8 bytes of
the payload; the third descriptor in the array describes the remaining 4 bytes of the frame.
In the third descriptor the Last bit in the Control word is set to true/1 to indicate it is the last
descriptor in the frame. In this example the Interrupt bit in the descriptor Control field is set
in the last fragment of the frame in order to trigger an interrupt after the transmission
completed. The Size field in the descriptor’s Control word is set to the number of bytes in
the fragment buffer, -1 encoded.
Note that in real device drivers, the payload will typically only be split across multiple
descriptors if it is more than 2 kB. Also note that transmission payload data is forwarded to
the hardware without the device driver copying it (zero copy device driver).
After setting up the descriptors for the transaction the device driver increments the
TxProduceIndex register by 3 since three descriptors have been programmed. If the
transmit datapath was not enabled during initialization the device driver needs to enable
the datapath now.
If the transmit datapath is enabled the Ethernet block will start transmitting the frame as
soon as it detects the TxProduceIndex is not equal to TxConsumeIndex - both were zero
after reset. The Tx DMA will start reading the descriptors from memory. The memory
system will return the descriptors and the Ethernet block will accept them one by one
while reading the transmit data fragments.
As soon as transmission read data is returned from memory, the Ethernet block will try to
start transmission on the Ethernet connection via the (R)MII interface.
After transmitting each fragment of the frame the Tx DMA will write the status of the
fragment’s transmission. Statuses for all but the last fragment in the frame will be written
as soon as the data in the frame has been accepted by the Tx DMA manager. The status
for the last fragment in the frame will only be written after the transmission has completed
on the Ethernet connection.
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Since the Interrupt bit in the descriptor of the last fragment is set, after committing the
status of the last fragment to memory the Ethernet block will trigger a TxDoneInt interrupt,
which triggers the device driver to inspect the status information.
In this example the device driver cannot add new descriptors as long as the Ethernet
block has not incremented the TxConsumeIndex because the descriptor array is full (even
though one descriptor is not programmed yet). Only after the hardware commits the status
for the first fragment to memory and the TxConsumeIndex is set to 1 by the DMA manager
can the device driver program the next (the fourth) descriptor. The fourth descriptor can
already be programmed before completely transmitting the first frame.
In this example the hardware adds the CRC to the frame. If the device driver software
adds the CRC, the CRC trailer can be considered another frame fragment which can be
added by doing another gather DMA.
Each data byte is transmitted across the MII interface as two nibbles. On the MII interface
the Ethernet block adds the preamble, frame delimiter leader, and the CRC trailer if
hardware CRC is enabled. Once transmission on the MII interface commences the
transmission cannot be interrupted without generating an underrun error, which is why
descriptors and data read commands are issued as soon as possible and pipelined.
For an RMII PHY, the data communication between the Ethernet block and the PHY is
communicated at half the data-width (2 bits) and twice the clock frequency (50 MHz). In
10 Mbps mode data will only be transmitted once every 10 clock cycles.
9.7 Receive process
This section outlines the receive process including the activities in the device driver
software.
Device driver sets up descriptors
After initializing the receive descriptor and status arrays to receive frames from the
Ethernet connection, the receive datapath should be enabled in the MAC1 register and
the Control register.
During initialization, each Packet pointer in the descriptors is set to point to a data
fragment buffer. The size of the buffer is stored in the Size bits of the Control field of the
descriptor. Additionally, the Control field in the descriptor has an Interrupt bit. The Interrupt
bit allows generation of an interrupt after a fragment buffer has been filled and its status
has been committed to memory.
After the initialization and enabling of the receive datapath, all descriptors are owned by
the receive hardware and should not be modified by the software unless hardware hands
over the descriptor by incrementing the RxProduceIndex, indicating that a frame has been
received. The device driver is allowed to modify the descriptors after a (soft) reset of the
receive datapath.
Rx DMA manager reads Rx descriptor arrays
When the RxEnable bit in the Command register is set, the Rx DMA manager reads the
descriptors from memory at the address determined by RxDescriptor and
RxProduceIndex. The Ethernet block will start reading descriptors even before actual
receive data arrives on the (R)MII interface (descriptor prefetching). The block size of the
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descriptors to be read is determined by the total number of descriptors owned by the
hardware: RxConsumeIndex - RxProduceIndex - 1. Block transferring of descriptors
minimizes memory load. Read data returned from memory is buffered and consumed as
needed.
RX DMA manager receives data
After reading the descriptor, the receive DMA engine waits for the MAC to return receive
data from the (R)MII interface that passes the receive filter. Receive frames that do not
match the filtering criteria are not passed to memory. Once a frame passes the receive
filter, the data is written in the fragment buffer associated with the descriptor. The Rx DMA
does not write beyond the size of the buffer. When a frame is received that is larger than a
descriptor’s fragment buffer, the frame will be written to multiple fragment buffers of
consecutive descriptors. In the case of a multi-fragment reception, all but the last fragment
in the frame will return a status where the LastFrag bit is set to 0. Only on the last
fragment of a frame the LastFrag bit in the status will be set to 1. If a fragment buffer is the
last of a frame, the buffer may not be filled completely. The first receive data of the next
frame will be written to the fragment buffer of the next descriptor.
After receiving a fragment, the Rx DMA manager writes status information back to the
StatusInfo and StatusHashCRC words of the status. The Ethernet block writes the size in
bytes of a descriptor’s fragment buffer in the RxSize field of the Status word. The value of
the RxProduceIndex is only updated after the fragment data and the fragment status
information has been committed to memory, which is checked by an internal tag protocol
in the memory interface. The Rx DMA manager continues to receive frames until the
descriptor array is full. If the descriptor array is full, the Ethernet hardware will set the
RxFinishedInt bit of the IntStatus register. The receive datapath will still be enabled. If the
receive descriptor array is full any new receive data will generate an overflow error and
interrupt.
Update ProduceIndex
Each time the Rx DMA manager commits a data fragment and the associated status word
to memory, it completes the reception of a descriptor and increments the RxProduceIndex
(taking wrap around into account) in order to hand the descriptor back to the device driver
software. Software can re-use the descriptor for new receptions by handing it back to
hardware when the receive data has been processed.
The device driver software can keep track of the progress of the DMA manager by reading
the RxProduceIndex register to see how far along the receive process is. When the Rx
descriptor array is emptied completely, the RxProduceIndex retains its last value.
Write reception status
After the frame has been received from the (R)MII bus, the StatusInfo and
StatusHashCRC words of the frame descriptor are
updated by the DMA manager.
If the descriptor is for the last fragment of a frame (or for the whole frame if there are no
fragments), then depending on the success or failure of the frame reception, error flags
(Error, NoDescriptor, Overrun, AlignmentError, RangeError, LengthError, SymbolError, or
CRCError) are set in StatusInfo. The RxSize field is set to the number of bytes actually
written to the fragment buffer, -1 encoded. For fragments not being the last in the frame
the RxSize will match the size of the buffer. The hash CRCs of the destination and source
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addresses of a packet are calculated once for all the fragments belonging to the same
packet and then stored in every StatusHashCRC word of the statuses associated with the
corresponding fragments. If the reception reports an error, any remaining data in the
receive frame is discarded and the LastFrag bit will be set in the receive status field, so
the error flags in all but the last fragment of a frame will always be 0.
The status of the last received frame can also be inspected by reading the RSV register.
The register does not report statuses on a fragment basis and does not store information
of previously received frames. RSV is provided primarily for debug purposes, because the
communication between driver software and the Ethernet block takes place through the
frame descriptors.
Reception error handling
When an error occurs during the receive process, the Rx DMA manager will report the
error via the receive StatusInfo written in the Status array and the IntStatus interrupt status
register.
The receive process can generate several types of errors: AlignmentError, RangeError,
LengthError, SymbolError, CRCError, Overrun, and NoDescriptor. All have corresponding
bits in the receive StatusInfo. In addition to the separate bits in the StatusInfo,
AlignmentError, RangeError, LengthError, SymbolError, and CRCError are ORed together
into the Error bit of the StatusInfo. Errors are also propagated to the IntStatus register; the
RxError bit in the IntStatus register is set if there is an AlignmentError, RangeError,
LengthError, SymbolError, CRCError, or NoDescriptor error; nonfatal overrun errors are
reported in the RxError bit of the IntStatus register; fatal Overrun errors are report in the
RxOverrun bit of the IntStatus register. On fatal overrun errors, the Rx datapath needs to
be soft reset by setting the RxReset bit in the Command register.
Overrun errors can have three causes:
• In the case of a multi-fragment reception, the next descriptor may be missing. In this
case the NoDescriptor field is set in the status word of the previous descriptor and the
RxError in the IntStatus register is set. This error is nonfatal.
• The data flow on the receiver data interface stalls, corrupting the packet. In this case
the overrun bit in the status word is set and the RxError bit in the IntStatus register is
set. This error is nonfatal.
• The flow of reception statuses stalls and a new status has to be written while a
previous status still waits to be transferred across the memory interface. This error will
corrupt the hardware state and requires the hardware to be soft reset. The error is
detected and sets the Overrun bit in the IntStatus register.
The first overrun situation will result in an incomplete frame with a NoDescriptor status
and the RxError bit in IntStatus set. Software should discard the partially received frame.
In the second overrun situation the frame data will be corrupt which results in the Overrun
status bit being set in the Status word while the IntError interrupt bit is set. In the third case
receive errors cannot be reported in the receiver Status arrays which corrupts the
hardware state; the errors will still be reported in the IntStatus register’s Overrun bit. The
RxReset bit in the Command register should be used to soft reset the hardware.
Device drivers should catch the above receive errors and take action.
Receive triggers interrupts
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The receive datapath can generate four different interrupt types:
• If the Interrupt bit in the descriptor Control field is set, the Rx DMA will set the
RxDoneInt bit in the IntStatus register after receiving a fragment and committing the
associated data and status to memory. Even if a descriptor (fragment) is not the last in
a multi-fragment frame, the Interrupt bit in the descriptor can be used to generate an
interrupt.
• If the descriptor array is full while the Ethernet hardware is enabled, the hardware will
set the RxFinishedInt bit of the IntStatus register.
• If the AHB interface does not consume receive statuses at a sufficiently high
bandwidth, the receive status process may overrun, in which case the RxOverrun bit
will be set in the IntStatus register.
• If there is a receive error (AlignmentError, RangeError, LengthError, SymbolError, or
CRCError), or a multi-fragment frame where the device driver did provide descriptors
for the initial fragments but did not provide the descriptors for the rest of the
fragments, or if a nonfatal data Overrun occurred, the hardware will set the RxErrorInt
bit of the IntStatus register.
All of the above interrupts can be enabled and disabled by setting or resetting the
corresponding bits in the IntEnable register. Enabling or disabling does not affect the
IntStatus register contents, only the propagation of the interrupt status to the CPU (via the
Vectored Interrupt Controller).
The interrupts, either of individual frames or of the whole list, are a good means of
communication between the DMA manager and the device driver, triggering the device
driver to inspect the status words of descriptors that have been processed.
Device driver processes receive data
As a response to status (e.g. RxDoneInt) interrupts or polling of the RxProduceIndex, the
device driver can read the descriptors that have been handed over to it by the hardware
(RxProduceIndex - RxConsumeIndex). The device driver should inspect the status words
in the status array to check for multi-fragment receptions and receive errors.
The device driver can forward receive data and status to upper software layers. After
processing of data and status, the descriptors, statuses and data buffers may be recycled
and handed back to hardware by incrementing the RxConsumeIndex.
Receive example
Figure 11–31 illustrates the receive process in an example receiving a frame of 19 bytes.
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RxDescriptor
0x7FE010EC
RxStatus
0x7FE011F8
FRAGMENT 0 BUFFER(8 bytes)
0x7FE011F8
0x7FE01200
StatusInfo
StatusHashCRC
StatusInfo
StatusHashCRC
StatusInfo
StatusHashCRC
StatusInfo
StatusHashCRC
7
0x7FE010EC
PACKET
0x7FE01409
7
0x7FE010F0
1 CONTROL
7
FRAGMENT 1 BUFFER(8 bytes)
FRAGMENT 2 BUFFER(3 bytes)
FRAGMENT 3 BUFFER(8 bytes)
0x7FE010F4
0x7FE010F8
2
PACKET
0x7FE01411
0x7FE01208
0x7FE01210
7
1
1
1
CONTROL
7
PACKET
0x7FE01419
0x7FE010FC
0x7FE01100
0x7FE01104
0x7FE01108
CONTROL
7
PACKET
0x7FE01325
RxProduceIndex
RxConsumeIndex
CONTROL
7
RxDescriptorNumber= 3
descriptor array
fragment buffers
status array
Fig 31. Receive Example Memory and Registers
After reset, the values of the DMA registers will be zero. During initialization, the device
driver will allocate the descriptor and status array in memory. In this example, an array of
four descriptors is allocated; the array is 4x2x4 bytes and aligned on a 4 byte address
boundary. Since the number of descriptors matches the number of statuses, the status
array consists of four elements; the array is 4x2x4 bytes and aligned on a 8 byte address
boundary. The device driver writes the base address of the descriptor array
(0xFEED B0EC) in the RxDescriptor register, and the base address of the status array
(0xFEED B1F8) in the RxStatus register. The device driver writes the number of
descriptors and statuses minus 1 (3) in the RxDescriptorNumber register. The descriptors
and statuses in the arrays need not be initialized yet.
After allocating the descriptors, a fragment buffer needs to be allocated for each of the
descriptors. Each fragment buffer can be between 1 byte and 2 k bytes. The base
address of the fragment buffer is stored in the Packet field of the descriptors. The number
of bytes in the fragment buffer is stored in the Size field of the descriptor Control word.
The Interrupt field in the Control word of the descriptor can be set to generate an interrupt
as soon as the descriptor has been filled by the receive process. In this example the
fragment buffers are 8 bytes, so the value of the Size field in the Control word of the
descriptor is set to 7. Note that in this example, the fragment buffers are actually a
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continuous memory space; even when a frame is distributed over multiple fragments it will
typically be in a linear, continuous memory space; when the descriptors wrap at the end of
the descriptor array the frame will not be in a continuous memory space.
The device driver should enable the receive process by writing a 1 to the RxEnable bit of
the Command register, after which the MAC needs to be enabled by writing a 1 to the
‘RECEIVE ENABLE’ bit of the MAC1 configuration register. The Ethernet block will now
start receiving Ethernet frames. To reduce the processor interrupt load, some interrupts
can be disabled by setting the relevant bits in the IntEnable register.
After the Rx DMA manager is enabled, it will start issuing descriptor read commands. In
this example the number of descriptors is 4. Initially the RxProduceIndex and
RxConsumeIndex are 0. Since the descriptor array is considered full if RxProduceIndex
== RxConsumeIndex - 1, the Rx DMA manager can only read (RxConsumeIndex -
RxProduceIndex - 1 =) 3 descriptors; note the wrapping.
After enabling the receive function in the MAC, data reception will begin starting at the
next frame i.e. if the receive function is enabled while the (R)MII interface is halfway
through receiving a frame, the frame will be discarded and reception will start at the next
frame. The Ethernet block will strip the preamble and start of frame delimiter from the
frame. If the frame passes the receive filtering, the Rx DMA manager will start writing the
frame to the first fragment buffer.
Suppose the frame is 19 bytes long. Due to the buffer sizes specified in this example, the
frame will be distributed over three fragment buffers. After writing the initial 8 bytes in the
first fragment buffer, the status for the first fragment buffer will be written and the Rx DMA
will continue filling the second fragment buffer. Since this is a multi-fragment receive, the
status of the first fragment will have a 0 for the LastFrag bit in the StatusInfo word; the
RxSize field will be set to 7 (8, -1 encoded). After writing the 8 bytes in the second
fragment the Rx DMA will continue writing the third fragment. The status of the second
fragment will be like the status of the first fragment: LastFrag = 0, RxSize = 7. After writing
the three bytes in the third fragment buffer, the end of the frame has been reached and the
status of the third fragment is written. The third fragment’s status will have the LastFrag bit
set to 1 and the RxSize equal to 2 (3, -1 encoded).
The next frame received from the (R)MII interface will be written to the fourth fragment
buffer i.e. five bytes of the third buffer will be unused.
The Rx DMA manager uses an internal tag protocol in the memory interface to check that
the receive data and status have been committed to memory. After the status of the
fragments are committed to memory, an RxDoneInt interrupt will be triggered, which
activates the device driver to inspect the status information. In this example, all
descriptors have the Interrupt bit set in the Control word i.e. all descriptors will generate
an interrupt after committing data and status to memory.
In this example the receive function cannot read new descriptors as long as the device
driver does not increment the RxConsumeIndex, because the descriptor array is full (even
though one descriptor is not programmed yet). Only after the device driver has forwarded
the receive data to application software, and after the device driver has updated the
RxConsumeIndex by incrementing it, will the Ethernet block can continue reading
descriptors and receive data. The device driver will probably increment the
RxConsumeIndex by 3, since the driver will forward the complete frame consisting of
three fragments to the application, and hence free up three descriptors at the same time.
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Each pair of nibbles transferred on the MII interface (or four pairs of bits for RMII) is
transferred as a byte on the data write interface after being delayed by 128 or 136 cycles
for filtering by the receive filter and buffer modules. The Ethernet block removes
preamble, frame start delimiter, and CRC from the data and checks the CRC. To limit the
buffer NoDescriptor error probability, three descriptors are buffered. The value of the
RxProduceIndex is only updated after status information has been committed to memory,
which is checked by an internal tag protocol in the memory interface. The software device
driver will process the receive data, after which the device driver will update the
RxConsumeIndex.
For an RMII PHY the data between the Ethernet block and the PHY is communicated at
half the data-width and twice the clock frequency (50 MHz).
9.8 Transmission retry
If a collision on the Ethernet occurs, it usually takes place during the collision window
spanning the first 64 bytes of a frame. If collision is detected, the Ethernet block will retry
the transmission. For this purpose, the first 64 bytes of a frame are buffered, so that this
data can be used during the retry. A transmission retry within the first 64 bytes in a frame
is fully transparent to the application and device driver software.
When a collision occurs outside of the 64 byte collision window, a LateCollision error is
triggered, and the transmission is aborted. After a LateCollision error, the remaining data
in the transmit frame will be discarded. The Ethernet block will set the Error and
LateCollision bits in the frame’s status fields. The TxError bit in the IntStatus register will
be set. If the corresponding bit in the IntEnable register is set, the TxError bit in the
IntStatus register will be propagated to the CPU (via the Vectored Interrupt Controller).
The device driver software should catch the interrupt and take appropriate actions.
The ‘RETRANSMISSION MAXIMUM’ field of the CLRT register can be used to configure
the maximum number of retries before aborting the transmission.
9.9 Status hash CRC calculations
For each received frame, the Ethernet block is able to detect the destination address and
source address and from them calculate the corresponding hash CRCs. To perform the
computation, the Ethernet block features two internal blocks: one is a controller
synchronized with the beginning and the end of each frame, the second block is the CRC
calculator.
When a new frame is detected, internal signaling notifies the controller.The controller
starts counting the incoming bytes of the frame, which correspond to the destination
address bytes. When the sixth (and last) byte is counted, the controller notifies the
calculator to store the corresponding 32 bit CRC into a first inner register. Then the
controller repeats counting the next incoming bytes, in order to get synchronized with the
source address. When the last byte of the source address is encountered, the controller
again notifies the CRC calculator, which freezes until the next new frame. When the
calculator receives this second notification, it stores the present 32 bit CRC into a second
inner register. Then the CRCs remain frozen in their own registers until new notifications
arise.
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The destination address and source address hash CRCs being written in the
StatusHashCRC word are the nine most significant bits of the 32 bit CRCs as calculated
by the CRC calculator.
9.10 Duplex modes
The Ethernet block can operate in full duplex and half duplex mode. Half or full duplex
mode needs to be configured by the device driver software during initialization.
For a full duplex connection the FullDuplex bit of the Command register needs to be set to
1 and the FULL-DUPLEX bit of the MAC2 configuration register needs to be set to 1; for
half duplex the same bits need to be set to 0.
9.11 IEE 802.3/Clause 31 flow control
Overview
For full duplex connections, the Ethernet block supports IEEE 802.3/clause 31 flow control
using pause frames. This type of flow control may be used in full-duplex point-to-point
connections. Flow control allows a receiver to stall a transmitter e.g. when the receive
buffers are (almost) full. For this purpose, the receiving side sends a pause frame to the
transmitting side.
Pause frames use units of 512 bit times corresponding to 128 rx_clk/tx_clk cycles.
Receive flow control
In full-duplex mode, the Ethernet block will suspend its transmissions when the it receives
a pause frame. Rx flow control is initiated by the receiving side of the transmission. It is
enabled by setting the ‘RX FLOW CONTROL’ bit in the MAC1 configuration register. If the
RX FLOW CONTROL’ bit is zero, then the Ethernet block ignores received pause control
frames. When a pause frame is received on the Rx side of the Ethernet block,
transmission on the Tx side will be interrupted after the currently transmitting frame has
completed, for an amount of time as indicated in the received pause frame. The transmit
datapath will stop transmitting data for the number of 512 bit slot times encoded in the
pause-timer field of the received pause control frame.
By default the received pause control frames are not forwarded to the device driver. To
forward the receive flow control frames to the device driver, set the ‘PASS ALL RECEIVE
FRAMES’ bit in the MAC1 configuration register.
Transmit flow control
If case device drivers need to stall the receive data e.g. because software buffers are full,
the Ethernet block can transmit pause control frames. Transmit flow control needs to be
initiated by the device driver software; there is no IEEE 802.3/31 flow control initiated by
hardware, such as the DMA managers.
With software flow control, the device driver can detect a situation in which the process of
receiving frames needs to be interrupted by sending out Tx pause frames. Note that due
to Ethernet delays, a few frames can still be received before the flow control takes effect
and the receive stream stops.
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Transmit flow control is activated by writing 1 to the TxFlowControl bit of the Command
register. When the Ethernet block operates in full duplex mode, this will result in
transmission of IEEE 802.3/31 pause frames. The flow control continues until a 0 is
written to TxFlowControl bit of the Command register.
If the MAC is operating in full-duplex mode, then setting the TxFlowControl bit of the
Command register will start a pause frame transmission. The value inserted into the
pause-timer value field of transmitted pause frames is programmed via the
PauseTimer[15:0] bits in the FlowControlCounter register. When the TxFlowControl bit is
deasserted, another pause frame having a pause-timer value of 0x0000 is automatically
sent to abort flow control and resume transmission.
When flow control be in force for an extended time, a sequence of pause frames must be
transmitted. This is supported with a mirror counter mechanism. To enable mirror
counting, a nonzero value is written to the MirrorCounter[15:0] bits in the
FlowControlCounter register. When the TxFlowControl bit is asserted, a pause frame is
transmitted. After sending the pause frame, an internal mirror counter is initialized to zero.
The internal mirror counter starts incrementing one every 512 bit-slot times. When the
internal mirror counter reaches the MirrorCounter value, another pause frame is
transmitted with pause-timer value equal to the PauseTimer field from the
FlowControlCounter register, the internal mirror counter is reset to zero and restarts
counting. The register MirrorCounter[15:0] is usually set to a smaller value than register
PauseTimer[15:0] to ensure an early expiration of the mirror counter, allowing time to send
a new pause frame before the transmission on the other side can resume. By continuing
to send pause frames before the transmitting side finishes counting the pause timer, the
pause can be extended as long as TxFlowControl is asserted. This continues until
TxFlowControl is deasserted when a final pause frame having a pause-timer value of
0x0000 is automatically sent to abort flow control and resume transmission. To disable the
mirror counter mechanism, write the value 0 to MirrorCounter field in the
FlowControlCounter register. When using the mirror counter mechanism, account for
time-of-flight delays, frame transmission time, queuing delays, crystal frequency
tolerances, and response time delays by programming the MirrorCounter conservatively,
typically about 80% of the PauseTimer value.
If the software device driver sets the MirrorCounter field of the FlowControlCounter
register to zero, the Ethernet block will only send one pause control frame. After sending
the pause frame an internal pause counter is initialized at zero; the internal pause counter
is incremented by one every 512 bit-slot times. Once the internal pause counter reaches
the value of the PauseTimer register, the TxFlowControl bit in the Command register will
be reset. The software device driver can poll the TxFlowControl bit to detect when the
pause completes.
The value of the internal counter in the flow control module can be read out via the
FlowControlStatus register. If the MirrorCounter is nonzero, the FlowControlStatus register
will return the value of the internal mirror counter; if the MirrorCounter is zero the
FlowControlStatus register will return the value of the internal pause counter value.
The device driver is allowed to dynamically modify the MirrorCounter register value and
switch between zero MirrorCounter and nonzero MirrorCounter modes.
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Transmit flow control is enabled via the ‘TX FLOW CONTROL’ bit in the MAC1
configuration register. If the ‘TX FLOW CONTROL’ bit is zero, then the MAC will not
transmit pause control frames, software must not initiate pause frame transmissions, and
the TxFlowControl bit in the Command register should be zero.
Transmit flow control example
Figure 11–32 illustrates the transmit flow control.
device driver
register
PauseTimer
MirrorCounter
TxFlowCtl
clear
TxFlowCtl
writes
pause control
frame
transmission
pause control
frame
transmission
pause control
frame
transmission
(R)MII
transmit transmission
normal
normal transimisson
MirrorCounter
(1/515 bit
slots)
(R)MII
receive
pause in effect
normal receive
normal receive
0
50
100
150
200
250
300
350
400
450
500
Fig 32. Transmit Flow Control
In this example, a frame is received while transmitting another frame (full duplex.) The
device driver detects that some buffer might overrun and enables the transmit flow control
by programming the PauseTimer and MirrorCounter fields of the FlowControlCounter
register, after which it enables the transmit flow control by setting the TxFlowControl bit in
the Command register.
As a response to the enabling of the flow control a pause control frame will be sent after
the currently transmitting frame has been transmitted. When the pause frame
transmission completes the internal mirror counter will start counting bit slots; as soon as
the counter reaches the value in the MirrorCounter field another pause frame is
transmitted. While counting the transmit datapath will continue normal transmissions.
As soon as software disables transmit flow control a zero pause control frame is
transmitted to resume the receive process.
9.12 Half-Duplex mode backpressure
When in half-duplex mode, backpressure can be generated to stall receive packets by
sending continuous preamble that basically jams any other transmissions on the Ethernet
medium. When the Ethernet block operates in half duplex mode, asserting
the TxFlowControl bit in the Command register will result in applying continuous preamble
on the Ethernet wire, effectively blocking traffic from any other Ethernet station on the
same segment.
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In half duplex mode, when the TxFlowControl bit goes high, continuous preamble is sent
until TxFlowControl is deasserted. If the medium is idle, the Ethernet block begins
transmitting preamble, which raises carrier sense causing all other stations to defer. In the
event the transmitting of preamble causes a collision, the backpressure ‘rides through’ the
collision. The colliding station backs off and then defers to the backpressure. If during
backpressure, the user wishes to send a frame, the backpressure is interrupted, the frame
sent and then the backpressure resumed. If TxFlowControl is asserted for longer than
3.3 ms in 10 Mbps mode or 0.33 ms in 100 Mbps mode, backpressure will cease sending
preamble for several byte times to avoid the jabber limit.
9.13 Receive filtering
Features of receive filtering
The Ethernet MAC has several receive packet filtering functions that can be configured
from the software driver:
• Perfect address filter: allows packets with a perfectly matching station address to be
identified and passed to the software driver.
• Hash table filter: allows imperfect filtering of packets based on the station address.
• Unicast/multicast/broadcast filtering: allows passing of all unicast, multicast, and/or
broadcast packets.
• Magic packet filter: detection of magic packets to generate a Wake-on-LAN interrupt.
The filtering functions can be logically combined to create complex filtering functions.
Furthermore, the Ethernet block can pass or reject runt packets smaller than 64 bytes; a
promiscuous mode allows all packets to be passed to software.
Overview
The Ethernet block has the capability to filter out receive frames by analyzing the Ethernet
destination address in the frame. This capability greatly reduces the load on the host
system, because Ethernet frames that are addressed to other stations would otherwise
need to be inspected and rejected by the device driver software, using up bandwidth,
memory space, and host CPU time. Address filtering can be implemented using the
perfect address filter or the (imperfect) hash filter. The latter produces a 6 bits hash code
which can be used as an index into a 64 entry programmable hash table. Figure 11–33
depicts a functional view of the receive filter.
At the top of the diagram the Ethernet receive frame enters the filters. Each filter is
controlled by signals from control registers; each filter produces a ‘Ready’ output and a
‘Match’ output. If ‘Ready’ is 0 then the Match value is ‘don’t care’; if a filter finishes filtering
then it will assert its Ready output; if the filter finds a matching frame it will assert the
Match output along with the Ready output. The results of the filters are combined by logic
functions into a single RxAbort output. If the RxAbort output is asserted, the frame does
not need to be received.
In order to reduce memory traffic, the receive datapath has a buffer of 68 bytes. The
Ethernet MAC will only start writing a frame to memory after 68 byte delays. If the RxAbort
signal is asserted during the initial 68 bytes of the frame, the frame can be discarded and
removed from the buffer and not stored to memory at all, not using up receive descriptors,
etc. If the RxAbort signal is asserted after the initial 68 bytes in a frame (probably due to
reception of a Magic Packet), part of the frame is already written to memory and the
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Ethernet MAC will stop writing further data in the frame to memory; the FailFilter bit in the
status word of the frame will be set to indicate that the software device driver can discard
the frame immediately.
packet
AcceptUnicastEn
AcceptMulticastEn
AcceptMulticastHashEn
AcceptUnicastHashEn
HashFilter
StationAddress
AcceptPerfectEn
IMPERFECT
HASH
FILTER
PERFECT
ADDRESS
FILTER
CRC
OK?
FMatch
RxFilterWoL
RxAbort
RxFilterEnWoL
FReady
Fig 33. Receive filter block diagram
Unicast, broadcast and multicast
Generic filtering based on the type of frame (unicast, multicast or broadcast) can be
programmed using the AcceptUnicastEn, AcceptMulticastEn, or AcceptBroadcastEn bits
of the RxFilterCtrl register. Setting the AcceptUnicast, AcceptMulticast, and
AcceptBroadcast bits causes all frames of types unicast, multicast and broadcast,
respectively, to be accepted, ignoring the Ethernet destination address in the frame. To
program promiscuous mode, i.e. to accept all frames, set all 3 bits to 1.
Perfect address match
When a frame with a unicast destination address is received, a perfect filter compares the
destination address with the 6 byte station address programmed in the station address
registers SA0, SA1, SA2. If the AcceptPerfectEn bit in the RxFilterCtrl register is set to 1,
and the address matches, the frame is accepted.
Imperfect hash filtering
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An imperfect filter is available, based on a hash mechanism. This filter applies a hash
function to the destination address and uses the hash to access a table that indicates if
the frame should be accepted. The advantage of this type of filter is that a small table can
cover any possible address. The disadvantage is that the filtering is imperfect, i.e.
sometimes frames are accepted that should have been discarded.
• Hash function:
– The standard Ethernet cyclic redundancy check (CRC) function is calculated from
the 6 byte destination address in the Ethernet frame (this CRC is calculated
anyway as part of calculating the CRC of the whole frame), then bits [28:23] out of
the 32 bits CRC result are taken to form the hash. The 6 bit hash is used to access
the hash table: it is used as an index in the 64 bit HashFilter register that has been
programmed with accept values. If the selected accept value is 1, the frame is
accepted.
– The device driver can initialize the hash filter table by writing to the registers
HashFilterL and HashfilterH. HashFilterL contains bits 0 through 31 of the table
and HashFilterH contains bit 32 through 63 of the table. So, hash value 0
corresponds to bit 0 of the HashfilterL register and hash value 63 corresponds to
bit 31 of the HashFilterH register.
• Multicast and unicast
– The imperfect hash filter can be applied to multicast addresses, by setting the
AcceptMulticastHashEn bit in the RxFilter register to 1.
– The same imperfect hash filter that is available for multicast addresses can also be
used for unicast addresses. This is useful to be able to respond to a multitude of
unicast addresses without enabling all unicast addresses. The hash filter can be
applied to unicast addresses by setting the AcceptUnicastHashEn bit in the
RxFilter register to 1.
Enabling and disabling filtering
The filters as defined in the sections above can be bypassed by setting the PassRxFilter
bit in the Command register. When the PassRxFilter bit is set, all receive frames will be
passed to memory. In this case the device driver software has to implement all filtering
functionality in software. Setting the PassRxFilter bit does not affect the runt frame filtering
as defined in the next section.
Runt frames
A frame with less than 64 bytes (or 68 bytes for VLAN frames) is shorter than the
minimum Ethernet frame size and therefore considered erroneous; they might be collision
fragments. The receive datapath automatically filters and discards these runt frames
without writing them to memory and using a receive descriptor.
When a runt frame has a correct CRC there is a possibility that it is intended to be useful.
The device driver can receive the runt frames with correct CRC by setting the
PassRuntFrame bit of the Command register to 1.
9.14 Power management
The Ethernet block supports power management by means of clock switching. All clocks
in the Ethernet core can be switched off. If Wake-up on LAN is needed, the rx_clk should
not be switched off.
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9.15 Wake-up on LAN
Overview
The Ethernet block supports power management with remote wake-up over LAN. The
host system can be powered down, even including part of the Ethernet block itself, while
the Ethernet block continues to listen to packets on the LAN. Appropriately formed
packets can be received and recognized by the Ethernet block and used to trigger the
host system to wake up from its power-down state.
Wake-up of the system takes effect through an interrupt. When a wake-up event is
detected, the WakeupInt bit in the IntStatus register is set. The interrupt status will trigger
an interrupt if the corresponding WakeupIntEn bit in the IntEnable register is set. This
interrupt should be used by system power management logic to wake up the system.
While in a power-down state the packet that generates a Wake-up on LAN event is lost.
There are two ways in which Ethernet packets can trigger wake-up events: generic
Wake-up on LAN and Magic Packet. Magic Packet filtering uses an additional filter for
Magic Packet detection. In both cases a Wake-up on LAN event is only triggered if the
signal.
The RxFilterWoLStatus register can be read by the software to inspect the reason for a
Wake-up event. Before going to power-down the power management software should
clear the register by writing the RxFilterWolClear register.
NOTE: when entering in power-down mode, a receive frame might be not entirely stored
into the Rx buffer. In this situation, after turning exiting power-down mode, the next
receive frame is corrupted due to the data of the previous frame being added in front of
the last received frame. Software drivers have to reset the receive datapath just after
exiting power-down mode.
The following subsections describe the two Wake-up on LAN mechanisms.
Filtering for WoL
The receive filter functionality can be used to generate Wake-up on LAN events. If the
RxFilterEnWoL bit of the RxFilterCtrl register is set, the receive filter will set the WakeupInt
bit of the IntStatus register if a frame is received that passes the filter. The interrupt will
only be generated if the CRC of the frame is correct.
Magic Packet WoL
The Ethernet block supports wake-up using Magic Packet technology (see ‘Magic Packet
technology’, Advanced Micro Devices). A Magic Packet is a specially formed packet solely
intended for wake-up purposes. This packet can be received, analyzed and recognized by
the Ethernet block and used to trigger a wake-up event.
A Magic Packet is a packet that contains in its data portion the station address repeated
16 times with no breaks or interruptions, preceded by 6 Magic Packet synchronization
bytes with the value 0xFF. Other data may be surrounding the Magic Packet pattern in the
data portion of the packet. The whole packet must be a well-formed Ethernet frame.
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The magic packet detection unit analyzes the Ethernet packets, extracts the packet
address and checks the payload for the Magic Packet pattern. The address from the
packet is used for matching the pattern (not the address in the SA0/1/2 registers.) A magic
packet only sets the wake-up interrupt status bit if the packet passes the receive filter as
filter result to produce the result.
Magic Packet filtering is enabled by setting the MagicPacketEnWoL bit of the RxFilterCtrl
register. Note that when doing Magic Packet WoL, the RxFilterEnWoL bit in the
RxFilterCtrl register should be 0. Setting the RxFilterEnWoL bit to 1 would accept all
packets for a matching address, not just the Magic Packets i.e. WoL using Magic Packets
is more strict.
When a magic packet is detected, apart from the WakeupInt bit in the IntStatus register,
the MagicPacketWoL bit is set in the RxFilterWoLStatus register. Software can reset the
bit writing a 1 to the corresponding bit of the RxFilterWoLClear register.
Example: An example of a Magic Packet with station address 0x11 0x22 0x33 0x44 0x55
0x66 is the following (MISC indicates miscellaneous additional data bytes in the packet):
<DESTINATION> <SOURCE> <MISC>
FF FF FF FF FF FF
11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66
<MISC> <CRC>
9.16 Enabling and disabling receive and transmit
Enabling and disabling reception
After reset, the receive function of the Ethernet block is disabled. The receive function can
be enabled by the device driver setting the RxEnable bit in the Command register and the
“RECEIVE ENABLE’ bit in the MAC1 configuration register (in that order).
The status of the receive datapath can be monitored by the device driver by reading the
generation of the RxStatus bit.
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ACTIVE
RxStatus = 1
xxxxxxxxxxxxxxxxxx
RxEnable = 0 and not busy receiving
OR
RxEnable = 1
RxProduceIndex = RxConsumeIndex - 1
INACTIVE
RxStatus = 0
reset
Fig 34. Receive Active/Inactive state machine
After a reset, the state machine is in the INACTIVE state. As soon as the RxEnable bit is
set in the Command register, the state machine transitions to the ACTIVE state. As soon
as the RxEnable bit is cleared, the state machine returns to the INACTIVE state. If the
receive datapath is busy receiving a packet while the receive datapath gets disabled, the
packet will be received completely, stored to memory along with its status before returning
to the INACTIVE state. Also if the Receive descriptor array is full, the state machine will
return to the INACTIVE state.
after a soft reset the receive datapath is inactive until the datapath is re-enabled.
Enabling and disabling transmission
After reset, the transmit function of the Ethernet block is disabled. The Tx transmit
datapath can be enabled by the device driver setting the TxEnable bit in the Command
register to 1.
The status of the transmit datapaths can be monitored by the device driver reading the
generation of the TxStatus bit.
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ACTIVE
TxStatus = 1
xxxxxxxxxxxxxxxxxxxxxx
TxEnable = 1
TxEnable = 0 and not busy transmitting
AND
OR
TxProduceIndex <> TxConsumeIndex
TxProduceIndex = TxConsumeIndex
INACTIVE
TxStatus = 0
reset
Fig 35. Transmit Active/Inactive state machine
After reset, the state machine is in the INACTIVE state. As soon as the TxEnable bit is set
in the Command register and the Produce and Consume indices are not equal, the state
machine transitions to the ACTIVE state. As soon as the TxEnable bit is cleared and the
transmit datapath has completed all pending transmissions, including committing the
transmission status to memory, the state machine returns to the INACTIVE state. The
state machine will also return to the INACTIVE state if the Produce and Consume indices
are equal again i.e. all frames have been transmitted.
after a soft reset the transmit datapath is inactive until the datapath is re-enabled.
9.17 Transmission padding and CRC
In the case of a frame of less than 60 bytes (or 64 bytes for VLAN frames), the Ethernet
block can pad the frame to 64 or 68 bytes including a 4 bytes CRC Frame Check
Sequence (FCS). Padding is affected by the value of the ‘AUTO DETECT PAD ENABLE’
(ADPEN), ‘VLAN PAD ENABLE’ (VLPEN) and ‘PAD/CRC ENABLE’ (PADEN) bits of the
MAC2 configuration register, as well as the Override and Pad bits from the transmit
descriptor Control word. CRC generation is affected by the ‘CRC ENABLE’ (CRCE) and
‘DELAYED CRC’ (DCRC) bits of the MAC2 configuration register, and the Override and
CRC bits from the transmit descriptor Control word.
The effective pad enable (EPADEN) is equal to the ‘PAD/CRC ENABLE’ bit from the
MAC2 register if the Override bit in the descriptor is 0. If the Override bit is 1, then
EPADEN will be taken from the descriptor Pad bit. Likewise the effective CRC enable
(ECRCE) equals CRCE if the Override bit is 0, otherwise it equal the CRC bit from the
descriptor.
If padding is required and enabled, a CRC will always be appended to the padded frames.
A CRC will only be appended to the non-padded frames if ECRCE is set.
If EPADEN is 0, the frame will not be padded and no CRC will be added unless ECRCE is
set.
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If EPADEN is 1, then small frames will be padded and a CRC will always be added to the
padded frames. In this case if ADPEN and VLPEN are both 0, then the frames will be
padded to 60 bytes and a CRC will be added creating 64 bytes frames; if VLPEN is 1, the
frames will be padded to 64 bytes and a CRC will be added creating 68 bytes frames; if
ADPEN is 1, while VLPEN is 0 VLAN frames will be padded to 64 bytes, non VLAN
frames will be padded to 60 bytes, and a CRC will be added to padded frames, creating
64 or 68 bytes padded frames.
If CRC generation is enabled, CRC generation can be delayed by four bytes by setting the
DELAYED CRC bit in the MAC2 register, in order to skip proprietary header information.
9.18 Huge frames and frame length checking
The ‘HUGE FRAME ENABLE’ bit in the MAC2 configuration register can be set to 1 to
enable transmission and reception of frames of any length. Huge frame transmission can
be enabled on a per frame basis by setting the Override and Huge bits in the transmit
descriptor Control word.
When enabling huge frames, the Ethernet block will not check frame lengths and report
frame length errors (RangeError and LengthError). If huge frames are enabled, the
received byte count in the RSV register may be invalid because the frame may exceed the
maximum size; the RxSize fields from the receive status arrays will be valid.
Frame lengths are checked by comparing the length/type field of the frame to the actual
number of bytes in the frame. A LengthError is reported by setting the corresponding bit in
the receive StatusInfo word.
The MAXF register allows the device driver to specify the maximum number of bytes in a
frame. The Ethernet block will compare the actual receive frame to the MAXF value and
report a RangeError in the receive StatusInfo word if the frame is larger.
9.19 Statistics counters
Generally, Ethernet applications maintain many counters that track Ethernet traffic
statistics. There are a number of standards specifying such counters, such as IEEE std
802.3 / clause 30. Other standards are RFC 2665 and RFC 2233.
The approach taken here is that by default all counters are implemented in software. With
the help of the StatusInfo field in frame statuses, many of the important statistics events
listed in the standards can be counted by software.
9.20 MAC status vectors
Transmit and receive status information as detected by the MAC are available in registers
TSV0, TSV1 and RSV so that software can poll them. These registers are normally of
limited use because the communication between driver software and the Ethernet block
takes place primarily through frame descriptors. Statistical events can be counted by
software in the device driver. However, for debug purposes the transmit and receive status
vectors are made visible. They are valid as long as the internal status of the MAC is valid
and should typically only be read when the transmit and receive processes are halted.
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9.21 Reset
Chapter 11: LPC24XX Ethernet
The Ethernet block has a hard reset input which is connected to the chip reset, as well as
several soft resets which can be activated by setting the appropriate bit(s) in registers. All
registers in the Ethernet block have a value of 0 after a hard reset, unless otherwise
specified.
Hard reset
After a hard reset, all registers will be set to their default value.
Soft reset
Parts of the Ethernet block can be soft reset by setting bits in the Command register and
the MAC1 configuration register.The MAC1 register has six different reset bits:
• SOFT RESET: Setting this bit will put all modules in the MAC in reset, except for the
MAC registers (at addresses 0x000 to 0x0FC). The value of the soft reset after a
hardware reset assertion is 1, i.e. the soft reset needs to be cleared after a hardware
reset.
• SIMULATION RESET: Resets the random number generator in the Transmit Function.
The value after a hardware reset assertion is 0.
• RESET MCS/Rx: Setting this bit will reset the MAC Control Sublayer (pause frame
logic) and the receive function in the MAC. The value after a hardware reset assertion
is 0.
• RESET Rx: Setting this bit will reset the receive function in the MAC. The value after a
hardware reset assertion is 0.
• RESET MCS/Tx: Setting this bit will reset the MAC Control Sublayer (pause frame
logic) and the transmit function in the MAC. The value after a hardware reset
assertion is 0.
• RESET Tx: Setting this bit will reset the transmit function of the MAC. The value after
a hardware reset assertion is 0.
The above reset bits must be cleared by software.
The Command register has three different reset bits:
• TxReset: Writing a ‘1’ to the TxReset bit will reset the transmit datapath, excluding the
MAC portions, including all (read-only) registers in the transmit datapath, as well as
the TxProduceIndex register in the host registers module. A soft reset of the transmit
datapath will abort all AHB transactions of the transmit datapath. The reset bit will be
cleared autonomously by the Ethernet block. A soft reset of the Tx datapath will clear
the TxStatus bit in the Status register.
• RxReset: Writing a ‘1’ to the RxReset bit will reset the receive datapath, excluding the
MAC portions, including all (read-only) registers in the receive datapath, as well as the
RxConsumeIndex register in the host registers module. A soft reset of the receive
datapath will abort all AHB transactions of the receive datapath. The reset bit will be
cleared autonomously by the Ethernet block. A soft reset of the Rx datapath will clear
the RxStatus bit in the Status register.
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• RegReset: Resets all of the datapaths and registers in the host registers module,
excluding the registers in the MAC. A soft reset of the registers will also abort all AHB
transactions of the transmit and receive datapath. The reset bit will be cleared
autonomously by the Ethernet block.
To do a full soft reset of the Ethernet block, device driver software must:
• Set the ‘SOFT RESET’ bit in the MAC1 register to 1.
• Set the RegReset bit in the Command register, this bit clears automatically.
• Reinitialize the MAC registers (0x000 to 0x0FC).
• Reset the ‘SOFT RESET’ bit in the MAC1 register to 0.
To reset just the transmit datapath, the device driver software has to:
• Set the ‘RESET MCS/Tx’ bit in the MAC1 register to 1.
• Disable the Tx DMA managers by setting the TxEnable bits in the Command register
to 0.
• Set the TxReset bit in the Command register, this bit clears automatically.
• Reset the ‘RESET MCS/Tx’ bit in the MAC1 register to 0.
To reset just the receive datapath, the device driver software has to:
• Disable the receive function by resetting the ‘RECEIVE ENABLE’ bit in the MAC1
configuration register and resetting of the RxEnable bit of the Command register.
• Set the ‘RESET MCS/Rx’ bit in the MAC1 register to 1.
• Set the RxReset bit in the Command register, this bit clears automatically.
• Reset the ‘RESET MCS/Rx’ bit in the MAC1 register to 0.
9.22 Ethernet errors
The Ethernet block generates errors for the following conditions:
• A reception can cause an error: AlignmentError, RangeError, LengthError,
SymbolError, CRCError, NoDescriptor, or Overrun. These are reported back in the
receive StatusInfo and in the interrupt status register (IntStatus).
• A transmission can cause an error: LateCollision, ExcessiveCollision,
ExcessiveDefer, NoDescriptor, or Underrun. These are reported back in the
transmission StatusInfo and in the interrupt status register (IntStatus).
9.23 AHB bandwidth
The Ethernet block is connected to an AHB bus which must carry all of the data and
control information associated with all Ethernet traffic in addition to the CPU accesses
required to operate the Ethernet block and deal with message contents.
9.23.1 DMA access
Assumptions
By making some assumptions, the bandwidth needed for each type of AHB transfer can
be calculated and added in order to find the overall bandwidth requirement.
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The flexibility of the descriptors used in the Ethernet block allows the possibility of defining
memory buffers in a range of sizes. In order to analyze bus bandwidth requirements,
some assumptions must be made about these buffers. The "worst case" is not addressed
since that would involve all descriptors pointing to single byte buffers, with most of the
memory occupied in holding descriptors and very little data. It can easily be shown that
the AHB cannot handle the huge amount of bus traffic that would be caused by such a
degenerate (and illogical) case.
For this analysis, an Ethernet packet is assumed to consist of a 64 byte frame.
Continuous traffic is assumed on both the transmit and receive channels.
This analysis does not reflect the flow of Ethernet traffic over time, which would include
inter-packet gaps in both the transmit and receive channels that reduce the bandwidth
requirements over a larger time frame.
Types of DMA access and their bandwidth requirements
The interface to an external Ethernet PHY is via either MII or RMII. An MII operates at
25 MHz, transferring a byte in 2 clock cycles. An RMII operates at 50 MHz , transferring a
byte in 4 clock cycles. The data transfer rate is the same in both cases: 12.5 Mbps.
The Ethernet block initiates DMA accesses for the following cases:
• Tx descriptor read:
– Transmit descriptors occupy 2 words (8 bytes) of memory and are read once for
each use of a descriptor.
– Two word read happens once every 64 bytes (16 words) of transmitted data.
– This gives 1/8th of the data rate, which = 1.5625 Mbps.
• Rx descriptor read:
– Receive descriptors occupy 2 words (8 bytes) of memory and are read once for
each use of a descriptor.
– Two word read happens once every 64 bytes (16 words) of received data.
– This gives 1/8th of the data rate, which = 1.5625 Mbps.
• Tx status write:
– Transmit status occupies 1 word (4 bytes) of memory and is written once for each
use of a descriptor.
– One word write happens once every 64 bytes (16 words) of transmitted data.
– This gives 1/16th of the data rate, which = 0.7813 Mbps.
• Rx status write:
– Receive status occupies 2 words (8 bytes) of memory and is written once for each
use of a descriptor.
– Two word write happens once every 64 bytes (16 words) of received data.
– This gives 1/8 of the data rate, which = 1.5625 Mbps.
• Tx data read:
– Data transmitted in an Ethernet frame, the size is variable.
– Basic Ethernet rate = 12.5 Mbps.
• Rx data write:
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Chapter 11: LPC24XX Ethernet
– Data to be received in an Ethernet frame, the size is variable.
– Basic Ethernet rate = 12.5 Mbps.
This gives a total rate of 30.5 Mbps for the traffic generated by the Ethernet DMA function.
9.23.2 Types of CPU access
• Accesses that mirror each of the DMA access types:
– All or part of status values must be read, and all or part of descriptors need to be
written after each use, transmitted data must be stored in the memory by the CPU,
and eventually received data must be retrieved from the memory by the CPU.
– This gives roughly the same or slightly lower rate as the combined DMA functions,
which = 30.5 Mbps.
• Access to registers in the Ethernet block:
– The CPU must read the RxProduceIndex, TxConsumeIndex, and IntStatus
registers, and both read and write the RxConsumeIndex and TxProduceIndex
registers.
– 7 word read/writes once every 64 bytes (16 words) of transmitted and received
data.
– This gives 7/16 of the data rate, which = 5.4688 Mbps.
This gives a total rate of 36 Mbps for the traffic generated by the Ethernet DMA function.
9.23.3 Overall bandwidth
Overall traffic on the AHB is the sum of DMA access rates and CPU access rates, which
comes to approximately 66.5 MB/s.
The peak bandwidth requirement can be somewhat higher due to the use of small
memory buffers, in order to hold often used addresses (e.g. the station address) for
example. Driver software can determine how to build frames in an efficient manner that
does not overutilize the AHB.
The bandwidth available on the AHB bus depends on the system clock frequency. As an
example, assume that the system clock is set at 60 MHz. All or nearly all of bus accesses
related to the Ethernet will be word transfers. The raw AHB bandwidth can be
approximated as 4 bytes per two system clocks, which equals 2 times the system clock
rate. With a 60 MHz system clock, the bandwidth is 120 MB/s, giving about 55% utilization
for Ethernet traffic during simultaneous transmit and receive operations.
9.24 CRC calculation
The calculation is used for several purposes:
• Generation the FCS at the end of the Ethernet frame.
• Generation of the hash table index for the hash table filtering.
• Generation of the destination and source address hash CRCs.
The C pseudocode function below calculates the CRC on a frame taking the frame
(without FCS) and the number of bytes in the frame as arguments. The function returns
the CRC as a 32 bit integer.
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Chapter 11: LPC24XX Ethernet
int crc_calc(char frame_no_fcs[], int frame_len) {
int
int
i;
j;
// iterator
// another iterator
char byte; // current byte
int crc; // CRC result
int q0, q1, q2, q3;
crc = 0xFFFFFFFF;
// temporary variables
for (i = 0; i < frame_len; i++) {
byte = *frame_no_fcs++;
for (j = 0; j < 2; j++) {
if (((crc >> 28) ^ (byte >> 3)) & 0x00000001) {
q3 = 0x04C11DB7;
} else {
q3 = 0x00000000;
}
if (((crc >> 29) ^ (byte >> 2)) & 0x00000001) {
q2 = 0x09823B6E;
} else {
q2 = 0x00000000;
}
if (((crc >> 30) ^ (byte >> 1)) & 0x00000001) {
q1 = 0x130476DC;
} else {
q1 = 0x00000000;
}
if (((crc >> 31) ^ (byte >> 0)) & 0x00000001) {
q0 = 0x2608EDB8;
} else {
q0 = 0x00000000;
}
crc = (crc << 4) ^ q3 ^ q2 ^ q1 ^ q0;
byte >>= 4;
}
}
return crc;
}
For FCS calculation, this function is passed a pointer to the first byte of the frame and the
length of the frame without the FCS.
For hash filtering, this function is passed a pointer to the destination address part of the
frame and the CRC is only calculated on the 6 address bytes. The hash filter uses bits
[28:23] for indexing the 64 bits { HashFilterH, HashFilterL } vector. If the corresponding bit
is set the packet is passed, otherwise it is rejected by the hash filter.
For obtaining the destination and source address hash CRCs, this function calculates first
both the 32 bit CRCs, then the nine most significant bits from each 32 bit CRC are
extracted, concatenated, and written in every StatusHashCRC word of every fragment
status.
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Chapter 12: LPC24XX LCD controller
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User manual
1. How to read this chapter
The LCD controller is available on parts LPC2470 and LPC2478 only.
2. Basic configuration
The LCD controller is configured using the following registers:
Remark: The LCD is disabled on reset (PCLCD = 0).
3. Introduction
The LCD controller provides all of the necessary control signals to interface directly to a
variety of color and monochrome LCD panels.
4. Features
• AHB bus master interface to access frame buffer.
• Setup and control via a separate AHB slave interface.
• Dual 16-deep programmable 64-bit wide FIFOs for buffering incoming display data.
• Supports single and dual-panel monochrome Super Twisted Nematic (STN) displays
with 4 or 8-bit interfaces.
• Supports single and dual-panel color STN displays.
• Supports Thin Film Transistor (TFT) color displays.
• Programmable display resolution including, but not limited to: 320x200, 320x240,
640x200, 640x240, 640x480, 800x600, and 1024x768.
• Hardware cursor support for single-panel displays.
• 15 gray-level monochrome, 3375 color STN, and 32K color palettized TFT support.
• 1, 2, or 4 bits-per-pixel (bpp) palettized displays for monochrome STN.
• 1, 2, 4, or 8 bpp palettized color displays for color STN and TFT.
• 16 bpp true-color non-palettized, for color STN and TFT.
• 24 bpp true-color non-palettized, for color TFT.
• Programmable timing for different display panels.
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Chapter 12: LPC24XX LCD controller
• 256 entry, 16-bit palette RAM, arranged as a 128x32-bit RAM.
• Frame, line, and pixel clock signals.
• AC bias signal for STN, data enable signal for TFT panels.
• Supports little and big-endian, and Windows CE data formats.
• LCD panel clock may be generated from the peripheral clock, or from a clock input
pin.
4.1 Programmable parameters
The following key display and controller parameters can be programmed:
• Horizontal front and back porch
• Horizontal synchronization pulse width
• Number of pixels per line
• Vertical front and back porch
• Vertical synchronization pulse width
• Number of lines per panel
• Number of pixel clocks per line
• Hardware cursor control.
• Signal polarity, active HIGH or LOW
• AC panel bias
• Panel clock frequency
• Bits-per-pixel
• Display type: STN monochrome, STN color, or TFT
• STN 4 or 8-bit interface mode
• STN dual or single panel mode
• Little-endian, big-endian, or Windows CE mode
• Interrupt generation event
4.2 Hardware cursor support
The hardware cursor feature reduces software overhead associated with maintaining a
cursor image in the LCD frame buffer.
Without this feature, software needed to:
• Save an image of the area under the next cursor position.
• Update the area with the cursor image.
• Repair the last cursor position with a previously saved image.
In addition, the LCD driver had to check whether the graphics operation had overwritten
the cursor, and correct it. With a cursor size of 64x64 and 24-bit color, each cursor move
involved reading and writing approximately 75KB of data.
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The hardware cursor removes the requirement for this management by providing a
completely separate image buffer for the cursor, and superimposing the cursor image on
the LCD output stream at the current cursor (X,Y) coordinate.
To move the hardware cursor, the software driver supplies a new cursor coordinate. The
frame buffer requires no modification. This significantly reduces software overhead.
The cursor image is held in the LCD controller in an internal 256x32-bit buffer memory.
4.3 Types of LCD panels supported
The LCD controller supports the following types of LCD panel:
• Active matrix TFT panels with up to 24-bit bus interface.
• Single-panel monochrome STN panels (4-bit and 8-bit bus interface).
• Dual-panel monochrome STN panels (4-bit and 8-bit bus interface per panel).
• Single-panel color STN panels, 8-bit bus interface.
• Dual-panel color STN panels, 8-bit bus interface per panel.
4.4 TFT panels
TFT panels support one or more of the following color modes:
• 1 bpp, palettized, 2 colors selected from available colors.
• 2 bpp, palettized, 4 colors selected from available colors.
• 4 bpp, palettized, 16 colors selected from available colors.
• 8 bpp, palettized, 256 colors selected from available colors.
• 12 bpp, direct 4:4:4 RGB.
• 16 bpp, direct 5:5:5 RGB, with 1 bpp not normally used. This pixel is still output, and
can be used as a brightness bit to connect to the Least Significant Bit (LSB) of RGB
components of a 6:6:6 TFT panel.
• 16 bpp, direct 5:6:5 RGB.
• 24 bpp, direct 8:8:8 RGB, providing over 16 million colors.
Each 16-bit palette entry is composed of 5 bpp (RGB), plus a common intensity bit. This
provides better memory utilization and performance compared with a full 6 bpp structure.
The total number of colors supported can be doubled from 32K to 64K if the intensity bit is
used and applied to all three color components simultaneously.
Alternatively, the 16 signals can be used to drive a 5:6:5 panel with the extra bit only
applied to the green channel.
4.5 Color STN panels
Color STN panels support one or more of the following color modes:
• 1 bpp, palettized, 2 colors selected from 3375.
• 2 bpp, palettized, 4 colors selected from 3375.
• 4 bpp, palettized, 16 colors selected from 3375.
• 8 bpp, palettized, 256 colors selected from 3375.
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Chapter 12: LPC24XX LCD controller
• 16 bpp, direct 4:4:4 RGB, with 4 bpp not being used.
4.6 Monochrome STN panels
Monochrome STN panels support one or more of the following modes:
• 1 bpp, palettized, 2 gray scales selected from 15.
• 2 bpp, palettized, 4 gray scales selected from 15.
• 4 bpp, palettized, 16 gray scales selected from 15.
More than 4 bpp for monochrome panels can be programmed, but using these modes has
no benefit because the maximum number of gray scales supported on the display is 15.
5. Pin description
The largest configuration for the LCD controller uses 31 pins. There are many variants
using as few as 10 pins for a monochrome STN panel. Pins are allocated in groups based
on the selected configuration. All LCD functions are shared with other chip functions. In
Table 242. LCD controller pins
Pin name
LCDPWR
LCDDCLK
Type
Function
output LCD panel power enable.
output LCD panel clock.
LCDENA/LCDM output STN AC bias drive or TFT data enable output.
LCDFP
LCDLE
LCDLP
output Frame pulse (STN). Vertical synchronization pulse (TFT)
output Line end signal
output Line synchronization pulse (STN). Horizontal synchronization pulse
(TFT)
LCDVD[23:0]
LCDCLKIN
output LCD panel data. Bits used depend on the panel configuration.
input
Optional clock input.
5.1 Signal usage
The signals that are used for various display types are identified in the following sections.
5.1.1 Signals used for single panel STN displays
upper panel data.
Table 243. Pins used for single panel STN displays
Pin name
4-bit Monochrome
(10 pins)
8-bit Monochrome
(14 pins)
Color
(14 pins)
LCDPWR
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
LCDDCLK
LCDENAB/ LCDM
LCDFP
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Chapter 12: LPC24XX LCD controller
Table 243. Pins used for single panel STN displays
Pin name
4-bit Monochrome
(10 pins)
8-bit Monochrome
(14 pins)
Color
(14 pins)
LCDLE
Y
Y
Y
LCDLP
Y
Y
Y
LCDVD[3:0]
LCDVD[7:4]
LCDVD[23:8]
UD[3:0]
UD[3:0]
UD[7:4]
-
UD[3:0]
UD[7:4]
-
-
-
5.1.2 Signals used for dual panel STN displays
upper panel data, and LD refers to lower panel data.
Table 244. Pins used for dual panel STN displays
Pin name
4-bit Monochrome
(14 pins)
8-bit Monochrome
(22 pins)
Color
(22 pins)
LCDPWR
Y
Y
Y
LCDDCLK
LCDENAB/ LCDM
LCDFP
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
LCDLE
Y
LCDLP
Y
Y
Y
LCDVD[3:0]
LCDVD[7:4]
LCDVD[11:8]
LCDVD[15:12]
LCDVD[23:16]
UD[3:0]
UD[3:0]
UD[7:4]
LD[3:0]
LD[7:4]
-
UD[3:0]
UD[7:4]
LD[3:0]
LD[7:4]
-
-
LD[3:0]
-
-
5.1.3 Signals used for TFT displays
Table 245. Pins used for TFT displays
Pin name
12-bit, 4:4:4
mode
16-bit, 5:6:5
mode
16-bit, 1:5:5:5
mode
24-bit
(30 pins)
(18 pins)
(22 pins)
(24 pins)
LCDPWR
LCDDCLK
LCDENAB/ LCDM
LCDFP
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
LCDLE
Y
Y
Y
Y
Y
LCDLP
Y
Y
Y
LCDVD[1:0]
LCDVD[2]
LCDVD[3]
LCDVD[7:4]
-
-
-
RED[1:0]
RED[2]
RED[3]
RED[7:4]
-
-
Intensity
RED[0]
RED[4:1]
-
RED[0]
RED[4:1]
RED[3:0]
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Table 245. Pins used for TFT displays
Pin name
12-bit, 4:4:4
mode
16-bit, 5:6:5
mode
16-bit, 1:5:5:5
mode
24-bit
(30 pins)
(18 pins)
(22 pins)
-
(24 pins)
-
LCDVD[9:8]
LCDVD[10]
-
GREEN[1:0]
GREEN[2]
GREEN[3]
GREEN[7:4]
BLUE[1:0]
BLUE[2]
-
GREEN[0]
GREEN[1]
GREEN[5:2]
-
Intensity
GREEN[0]
GREEN[4:1]
-
LCDVD[11]
-
LCDVD[15:12]
LCDVD[17:16]
LCDVD[18]
GREEN[3:0]
-
-
-
Intensity
BLUE[0]
BLUE[4:1]
LCDVD[19]
-
BLUE[0]
BLUE[4:1]
BLUE[3]
LCDVD[23:20]
BLUE[3:0]
BLUE[7:4]
6. LCD controller functional description
The LCD controller performs translation of pixel-coded data into the required formats and
timings to drive a variety of single or dual panel monochrome and color LCDs.
Packets of pixel coded data are fed using the AHB interface, to two independent,
programmable, 32-bit wide, DMA FIFOs that act as input data flow buffers.
The buffered pixel coded data is then unpacked using a pixel serializer.
Depending on the LCD type and mode, the unpacked data can represent:
• An actual true display gray or color value.
• An address to a 256x16 bit wide palette RAM gray or color value.
In the case of STN displays, either a value obtained from the addressed palette location,
or the true value is passed to the gray scaling generators. The hardware-coded gray scale
algorithm logic sequences the activity of the addressed pixels over a programmed number
of frames to provide the effective display appearance.
For TFT displays, either an addressed palette value or true color value is passed directly
to the output display drivers, bypassing the gray scaling algorithmic logic.
In addition to data formatting, the LCD controller provides a set of programmable display
control signals, including:
• LCD panel power enable.
• Pixel clock.
• Horizontal and vertical synchronization pulses.
• Display bias.
The LCD controller generates individual interrupts for:
• Upper or lower panel DMA FIFO underflow.
• Base address update signification.
• Vertical compare.
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• Bus error.
There is also a single combined interrupt that is asserted when any of the individual
interrupts become active.
Figure 12–36 shows a simplified block diagram of the LCD controller.
LCD control
signals
AHB
slave
interface
Timing
controller
LCD panel
clock
Panel clock
generator
Upper
panel
DMA
FIFO
LCDCLKIN
Upper
STN
Upper
AHB
master
interface
Input
FIFO
control
RAM
palette
(128x32)
Upper
panel
formatter
Pixel
serializer
panel
output
FIFO
Gray
scaler
Lower
panel
DMA
FIFO
Lower
STN
Lower
panel
output
FIFO
Lower
panel
formatter
Hardware
Cursor
LCD panel
data
STN/TFT
data
select
FIFO underflow
AHB error
Interrupt
Interrupt
generation
Fig 36. LCD controller block diagram
6.1 AHB interfaces
The LCD controller includes two separate AHB interfaces. The first, an AHB slave
interface, is used primarily by the CPU to access control and data registers within the LCD
controller. The second, an AHB master interface, is used by the LCD controller for DMA
access to display data stored in memory elsewhere in the system. The LCD DMA
controller can only access the 10 kB SRAM on AHB1 and the external memory.
6.1.1 AMBA AHB slave interface
The AHB slave interface connects the LCD controller to the AHB bus and provides CPU
accesses to the registers and palette RAM.
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6.1.2 AMBA AHB master interface
The AHB master interface transfers display data from a selected slave (memory) to the
LCD controller DMA FIFOs. It can be configured to obtain data from the 16 kB, on-chip
SRAM on AHB1, various types of off-chip static memory, or off-chip SDRAM.
In dual panel mode, the DMA FIFOs are filled up in an alternating fashion via a single
DMA request. In single panel mode, the DMA FIFOs are filled up in a sequential fashion
from a single DMA request.
The inherent AHB master interface state machine performs the following functions:
• Loads the upper panel base address into the AHB address incrementer on
recognition of a new frame.
• Monitors both the upper and lower DMA FIFO levels and asserts a DMA request to
request display data from memory, filling them to above the programmed watermark.
the DMA request is reasserted when there are at least four locations available in
either FIFO (dual panel mode).
• Checks for 1KB boundaries during fixed-length bursts, appropriately adjusting the
address in such occurrences.
• Generates the address sequences for fixed-length and undefined bursts.
• Controls the handshaking between the memory and DMA FIFOs. It inserts busy
cycles if the FIFOs have not completed their synchronization and updating sequence.
• Fills up the DMA FIFOs, in dual panel mode, in an alternating fashion from a single
DMA request.
• Asserts the a bus error interrupt if an error occurs during an active burst.
• Responds to retry commands by restarting the failed access. This introduces some
busy cycles while it re-synchronizes.
6.2 Dual DMA FIFOs and associated control logic
The pixel data accessed from memory is buffered by two DMA FIFOs that can be
independently controlled to cover single and dual-panel LCD types. Each FIFO is 16
words deep by 64 bits wide and can be cascaded to form an effective 32-Dword deep
FIFO in single panel mode.
Synchronization logic transfers the pixel data from the AHB clock domain to the LCD
controller clock domain. The water level marks in each FIFO are set such that each FIFO
requests data when at least four locations become available.
An interrupt signal is asserted if an attempt is made to read either of the two DMA FIFOs
when they are empty (an underflow condition has occurred).
6.3 Pixel serializer
This block reads the 32-bit wide LCD data from the output port of the DMA FIFO and
extracts 24, 16, 8, 4, 2, or 1 bpp data, depending on the current mode of operation. The
LCD controller supports big-endian, little-endian, and Windows CE data formats.
Depending on the mode of operation, the extracted data can be used to point to a color or
gray scale value in the palette RAM or can actually be a true color value that can be
directly applied to an LCD panel input.
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word corresponding to the endianness and bpp combinations. For each of the three
supported data formats, the required data for each panel display pixel must be extracted
from the data word.
Table 246. FIFO bits for Little-endian Byte, Little-endian Pixel order
FIFO bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
1 bpp
p31
p30
p29
p28
p27
p26
p25
p24
p23
p22
p21
p20
p19
p18
p17
p16
p15
p14
p13
p12
p11
p10
p9
2 bpp
4 bpp
8 bpp
16 bpp
24 bpp
p15
p7
p14
p13
p12
p11
p10
p9
p3
p6
p5
p4
p3
p2
p1
p0
p1
p2
p1
p0
p8
p7
p6
p0
p5
p4
8
p8
p0
7
p7
p3
6
p6
5
p5
p2
4
p4
3
p3
p1
2
p2
1
p1
p0
0
p0
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Table 247. FIFO bits for Big-endian Byte, Big-endian Pixel order
FIFO bit
1 bpp
p0
2 bpp
4 bpp
8 bpp
16 bpp
24 bpp
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
p0
p1
p0
p2
p1
p2
p3
p0
p4
p5
p1
p2
p3
p4
p5
p6
p7
p6
p3
p7
p0
p8
p4
p9
p10
p11
p12
p13
p14
p15
p16
p17
p18
p19
p20
p21
p22
p23
p24
p25
p26
p27
p28
p29
p30
p31
p5
p1
p2
p3
p6
p7
p8
p9
p0
p10
p11
p12
p13
p14
p15
8
p1
7
6
5
4
3
2
1
0
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Table 248. FIFO bits for Little-endian Byte, Big-endian Pixel order
FIFO bit
1 bpp
p24
p25
p26
p27
p28
p29
p30
p31
p16
p17
p18
p19
p20
p21
p22
p23
p8
2 bpp
4 bpp
8 bpp
16 bpp
24 bpp
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
p12
p6
p13
p14
p15
p8
p3
p7
p4
p5
p2
p3
p0
p1
p1
p9
p2
p1
p0
p10
p11
p4
p9
p10
p11
p12
p13
p14
p15
p0
p5
p0
p6
p7
8
p0
7
p0
6
p1
5
p2
p1
4
p3
3
p4
p2
2
p5
1
p6
p3
0
p7
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Table 249. RGB mode data formats
FIFO data 24-bit RGB 16-bit (1:5:5:5 RGB) 16-bit (5:6:5 RGB) 16-bit (4:4:4 RGB)
31
-
p1 intensity bit
p1, Blue 4
p1, Blue 3
p1, Blue 2
p1, Blue 1
p1, Blue 0
p1, Green 4
p1, Green 3
p1, Green 2
p1, Green 1
p1, Green 0
p1, Red 4
p1, Blue 4
p1, Blue 3
p1, Blue 2
p1, Blue 1
p1, Blue 0
p1, Green 5
p1, Green 4
p1, Green 3
p1, Green 2
p1, Green 1
p1, Green 0
p1, Red 4
p1, Red 3
p1, Red 2
p1, Red 1
p1, Red 0
p0, Blue 4
p0, Blue 3
p0, Blue 2
p0, Blue 1
p0, Blue 0
p0, Green 5
p0, Green 4
p0, Green 3
p0, Green 2
p0, Green 1
p0, Green 0
p0, Red 4
p0, Red 3
p0, Red 2
p0, Red 1
p0, Red 0
-
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
-
-
-
-
-
-
-
p1, Blue 3
p1, Blue 2
p1, Blue 1
p1, Blue 0
p1, Green 3
p1, Green 2
p1, Green 1
p1, Green 0
p1, Red 3
p1, Red 2
p1, Red 1
p1, Red 0
-
-
-
-
p0, Blue 7
p0, Blue 6
p0, Blue 5
p0, Blue 4
p0, Blue 3
p0, Blue 2
p0, Blue 1
p0, Blue 0
p0, Green 7
p0, Green 6
p0, Green 5
p0, Green 4
p0, Green 3
p0, Green 2
p0, Green 1
p0, Green 0
p0, Red 7
p0, Red 6
p0, Red 5
p0, Red 4
p0, Red 3
p0, Red 2
p0, Red 1
p0, Red 0
p1, Red 3
p1, Red 2
p1, Red 1
p1, Red 0
p0 intensity bit
p0, Blue 4
p0, Blue 3
p0, Blue 2
p0, Blue 1
p0, Blue 0
p0, Green 4
p0, Green 3
p0, Green 2
p0, Green 1
p0, Green 0
p0, Red 4
-
-
-
p0, Blue 3
p0, Blue 2
p0, Blue 1
p0, Blue 0
p0, Green 3
p0, Green 2
p0, Green 1
p0, Green 0
p0, Red 3
p0, Red 2
p0, Red 1
p0, Red 0
8
7
6
5
4
3
p0, Red 3
2
p0, Red 2
1
p0, Red 1
0
p0, Red 0
6.4 RAM palette
The RAM-based palette is a 256 x 16 bit dual-port RAM physically structured as 128 x 32
bits. Two entries can be written into the palette from a single word write access. The Least
Significant Bit (LSB) of the serialized pixel data selects between upper and lower halves of
the palette RAM. The half that is selected depends on the byte ordering mode. In
little-endian mode, setting the LSB selects the upper half, but in big-endian mode, the
lower half of the palette is selected.
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Pixel data values can be written and verified through the AHB slave interface. For
information on the supported colors, refer to the section on the related panel type earlier in
this chapter.
The palette RAM is a dual port RAM with independent controls and addresses for each
port. Port1 is used as a read/write port and is connected to the AHB slave interface. The
palette entries can be written and verified through this port. Port2 is used as a read-only
port and is connected to the unpacker and gray scaler. For color modes of less than 16
bpp, the palette enables each pixel value to be mapped to a 16-bit color:
• For TFT displays, the 16-bit value is passed directly to the pixel serializer.
• For STN displays, the 16-bit value is first converted by the gray scaler.
uses the TFT 1:5:5:5 data format. In 16 and 24 bpp TFT mode, the palette is bypassed
and the output of the pixel serializer is used as the TFT panel data.
Table 250. Palette data storage for TFT modes.
Bit(s)
Name
(RGB format)
I
Description
Name
(BGR format)
I
Description
(RGB format)
(BGR format)
31
Intensity / unused
Blue palette data
Green palette data
Red palette data
Intensity / unused
Blue palette data
Green palette data
Red palette data
Intensity / unused
Red palette data
Green palette data
Blue palette data
Intensity / unused
Red palette data
Green palette data
Blue palette data
30:26
25:21
20:16
15
B[4:0]
G[4:0]
R[4:0]
I
R[4:0]
G[4:0]
B[4:0]
I
14:10
9:5
B[4:0]
G[4:0]
R[4:0]
R[4:0]
G[4:0]
B[4:0]
4:0
The red and blue pixel data can be swapped to support BGR data format using a control
register bit (bit 8 = BGR). See the LCD_CTRL register description for more information.
Table 251. Palette data storage for STN color modes.
Bit(s)
Name
Description
(RGB format)
Unused
Name
Description
(BGR format)
Unused
(RGB format)
(BGR format)
31
-
-
30:27
26
B[3:0]
Blue palette data
Unused
R[3:0]
Red palette data
Unused
-
-
25:22
21
G[3:0]
Green palette data
Unused
G[3:0]
-
Green palette data
Unused
-
20:17
16
R[3:0]
-
Red palette data
Unused
B[3:0]
-
Blue palette data
Unused
15
I
Unused
I
Unused
14:11
10
B[4:1]
B[0]
G[4:1]
Blue palette data
Unused
R[4:1]
R[0]
G[4:1]
Red palette data
Unused
9:6
Green palette data
Green palette data
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Table 251. Palette data storage for STN color modes.
Bit(s)
Name
Description
(RGB format)
Unused
Name
Description
(BGR format)
Unused
(RGB format)
G[0]
(BGR format)
G[0]
5
4:1
0
R[4:1]
Red palette data
Unused
B[4:1]
Blue palette data
Unused
R[0]
B[0]
For monochrome STN mode, only the red palette field bits [4:1] are used. However, in
STN color mode the green and blue [4:1] are also used. Only 4 bits per color are used,
because the gray scaler only supports 16 different shades per color.
mode.
Table 252. Palette data storage for STN monochrome mode.
Bit(s)
31
Name
Description
Unused
-
30:27
26
-
Unused
-
Unused
25:22
21
-
Unused
-
Unused
20:17
16
Y[3:0]
Intensity data
Unused
-
15
-
Unused
14:11
10
-
Unused
-
Unused
9:6
-
Unused
5
-
Unused
4:1
Y[3:0]
-
Intensity data
Unused
0
6.5 Hardware cursor
The hardware cursor is an integral part of the LCD controller. It uses the LCD timing
module to provide an indication of the current scan position coordinate, and intercepts the
pixel stream between the palette logic and the gray scale/output multiplexer.
All cursor programming registers are accessed through the LCD slave interface. This also
provides a read/write port to the cursor image RAM.
6.5.1 Cursor operation
The hardware cursor is contained in a dual port RAM. It is programmed by software
through the AHB slave interface. The AHB slave interface also provides access to the
hardware cursor control registers. These registers enable you to modify the cursor
position and perform various other functions.
When enabled, the hardware cursor uses the horizontal and vertical synchronization
signals, along with a pixel clock enable and various display parameters to calculate the
current scan coordinate.
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When the display point is inside the bounds of the cursor image, the cursor replaces
frame buffer pixels with cursor pixels.
When the last cursor pixel is displayed, an interrupt is generated that software can use as
an indication that it is safe to modify the cursor image. This enables software controlled
animations to be performed without flickering for frame synchronized cursors.
6.5.2 Cursor sizes
Table 253. Palette data storage for STN monochrome mode.
X Pixels
32
Y Pixels
32
Bits per pixel
Words per line
Words in cursor image
2
2
2
4
64
64
64
256
6.5.3 Cursor movement
The following descriptions assume that both the screen and cursor origins are at the top
how each pixel coordinate is assumed to be the top left corner of the pixel.
(0,0)
CRSR_XY(X)
Fig 37. Cursor movement
6.5.4 Cursor XY positioning
The CRSR_XY register controls the cursor position on the cursor overlay (see Cursor XY
Position register). This provides separate fields for X and Y ordinates.
The CRSR_CFG register (see Cursor Configuration register) provides a FrameSync bit
controlling the visible behavior of the cursor.
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With FrameSync inactive, the cursor responds immediately to any change in the
programmed CRSR_XY value. Some transient smearing effects may be visible if the
cursor is moved across the LCD scan line.
With FrameSync active, the cursor only updates its position after a vertical
synchronization has occurred. This provides clean cursor movement, but the cursor
position only updates once a frame.
6.5.5 Cursor clipping
The CRSR_XY register (see Cursor XY Position register) is programmed with positive
binary values that enable the cursor image to be located anywhere on the visible screen
image. The cursor image is clipped automatically at the screen limits when it extends
pattern shows the visible portion of the cursor.
Because the CRSR_XY register values are positive integers, to emulate cursor clipping
on the left and top of screen, a Clip Position register, CRSR_CLIP, is provided. This
controls which point of the cursor image is positioned at the CRSR_CLIP coordinate. For
clipping functions on the Y axis, CRSR_XY(X) is zero, and Clip(X) is programmed to
provide the offset into the cursor image (X2 and X3). The equivalent function is provided
to clip on the X axis at the top of the display (Y2).
For cursors that are not clipped at the X=0 or Y=0 lines, program the Clip Position register
X and Y fields with zero to display the cursor correctly. See Clip(X4,Y4) for the effect of
incorrect programming.
Clip(X2)
Cursor(X5)
Clip(X3)
Clip(X4)
Cursor(X1)
Fig 38. Cursor clipping
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6.5.6 Cursor image format
The LCD frame buffer supports three packing formats, but the hardware cursor image
requirement has been simplified to support only LBBP. This is little-endian byte,
big-endian pixel for Windows CE mode.
The Image RAM start address is offset by 0x800 from the LCD base address, as shown in
the register description in this chapter.
The displayed cursor coordinate system is expressed in terms of (X,Y). 64 x 64 is an
TOP
(0, 0)
(0, 1)
(0, 2)
(1, 0)
(1, 1)
(1, 2)
(2, 0)
(2, 1)
(2, 2)
(29, 0)
(29, 1)
(29, 2)
(30, 0)
(30, 1)
(30, 2)
(31, 0)
(31, 1)
(31, 2)
LEFT
RIGHT
(0, 29)
(0, 30)
(0, 31)
(1, 29)
(1, 30)
(1, 31)
(2, 29)
(2, 30)
(2, 31)
(29, 29) (30, 29) (31, 29)
(29, 30) (30, 30) (31, 30)
(29, 31) (30, 31) (31, 31)
BOTTOM
Fig 39. Cursor image format
32 by 32 pixel format
base addresses for the four cursors.
Table 254. Addresses for 32 x 32 cursors
Address
Description
0xFFE1 0800
0xFFE1 0900
0xFFE1 0A00
0xFFE1 0B00
Cursor 0 start address.
Cursor 1 start address.
Cursor 2 start address.
Cursor 3 start address.
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Table 255. Buffer to pixel mapping for 32 x 32 pixel cursor format
Offset into cursor memory
Data bits
31:30
29:28
27:26
25:24
23:22
21:20
19:18
17:16
15:14
13:12
11:10
9:8
0
4
(8 * y)
(12, y)
(13, y)
(14, y)
(15, y)
(8, y)
(9, y)
(10, y)
(11, y)
(4, y)
(5, y)
(6, y)
(7, y)
(0, y)
(1, y)
(2, y)
(3, y)
(8 * y) +4
(28, y)
(29, y)
(30, y)
(31, y)
(24, y)
(25, y)
(26, y)
(27, y)
(20, y)
(21, y)
(22, y)
(23, y)
(16, y)
(17, y)
(18, y)
(19, y)
F8
FC
(12, 0)
(13, 0)
(14, 0)
(15, 0)
(8, 0)
(9, 0)
(10, 0)
(11, 0)
(4, 0)
(5, 0)
(6, 0)
(7, 0)
(0, 0)
(1, 0)
(2, 0)
(3, 0)
(28, 0)
(29, 0)
(30, 0)
(31, 0)
(24, 0)
(25, 0)
(26, 0)
(27, 0)
(20, 0)
(21, 0)
(22, 0)
(23, 0)
(16, 0)
(17, 0)
(18, 0)
(19, 0)
(12, 31)
(13, 31)
(14, 31)
(15, 31)
(8, 31)
(9, 31)
(10, 31)
(11, 31)
(4, 31)
(5, 31)
(6, 31)
(7, 31)
(0, 31)
(1, 31)
(2, 31)
(3, 31)
(28,31)
(29, 31)
(30, 31)
(31, 31)
(24, 31)
(25, 31)
(26, 31)
(27, 31)
(20, 31)
(21, 31)
(22, 31)
(23, 31)
(16, 31)
(17, 31)
(18, 31)
(19, 31)
7:6
5:4
3:2
1:0
64 by 64 pixel format
64 cursor format.
Table 256. Buffer to pixel mapping for 64 x 64 pixel cursor format
Offset into cursor memory
Data bits
31:30
29:28
27:26
25:24
23:22
21:20
19:18
17:16
15:14
13:12
11:10
9:8
0
4
8
12
(16 * y)
(12, y)
(13, y)
(14, y)
(15, y)
(8, y)
(16 * y) +4 (16 * y) + 8 (16 * y) + 12
FC
(12, 0)
(13, 0)
(14, 0)
(15, 0)
(8, 0)
(9, 0)
(10, 0)
(11, 0)
(4, 0)
(5, 0)
(6, 0)
(7, 0)
(0, 0)
(28, 0)
(29, 0)
(30, 0)
(31, 0)
(24, 0)
(25, 0)
(26, 0)
(27, 0)
(20, 0)
(21, 0)
(22, 0)
(23, 0)
(16, 0)
(44, 0)
(45, 0)
(46, 0)
(47, 0)
(40, 0)
(41, 0)
(42, 0)
(43, 0)
(36, 0)
(37, 0)
(38, 0)
(39, 0)
(32, 0)
(60, 0)
(61, 0)
(62, 0)
(63, 0)
(56, 0)
(57, 0)
(58, 0)
(59, 0)
(52, 0)
(53, 0)
(54, 0)
(55, 0)
(48, 0)
(28, y)
(29, y)
(30, y)
(31, y)
(24, y)
(25, y)
(26, y)
(27, y)
(20, y)
(21, y)
(22, y)
(23, y)
(16, y)
(44, y)
(45, y)
(46, y)
(47, y)
(40, y)
(41, y)
(42, y)
(43, y)
(36, y)
(37, y)
(38, y)
(39, y)
(32, y)
(60, y)
(61, y)
(62, y)
(63, y)
(56, y)
(57, y)
(58, y)
(59, y)
(52, y)
(53, y)
(54, y)
(55, y)
(48, y)
(60, 63)
(61, 63)
(62, 63)
(63, 63)
(56, 63)
(57, 63)
(58, 63)
(59, 63)
(52, 63)
(53, 63)
(54, 63)
(55, 63)
(48, 63)
(9, y)
(10, y)
(11, y)
(4, y)
(5, y)
(6, y)
(7, y)
7:6
(0, y)
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Table 256. Buffer to pixel mapping for 64 x 64 pixel cursor format
Offset into cursor memory
(16 * y) (16 * y) +4 (16 * y) + 8 (16 * y) + 12
(1, y)
Data bits
5:4
0
4
8
12
FC
(1, 0)
(2, 0)
(3, 0)
(17, 0)
(18, 0)
(19, 0)
(33, 0)
(34, 0)
(35, 0)
(49, 0)
(50, 0)
(51, 0)
(17, y)
(18, y)
(19, y)
(33, y)
(34, y)
(35, y)
(49, y)
(50, y)
(51, y)
(49, 63)
(50, 63)
(51, 63)
3:2
(2, y)
(3, y)
1:0
Cursor pixel encoding
Each pixel of the cursor requires two bits of information. These are interpreted as Color0,
Color1, Transparent, and Transparent inverted.
In the coding scheme, bit 1 selects between color and transparent (AND mask) and bit 0
selects variant (XOR mask).
Table 257. Pixel encoding
Value
Description
00
Color0.
The cursor color is displayed according to the Red-Green-Blue (RGB) value
programmed into the CRSR_PAL0 register.
01
10
11
Color1.
The cursor color is displayed according to the RGB value programmed into the
CRSR_PAL1 register.
Transparent.
The cursor pixel is transparent, so is displayed unchanged. This enables the visible
cursor to assume shapes that are not square.
Transparent inverted.
The cursor pixel assumes the complementary color of the frame pixel that is displayed.
This can be used to ensure that the cursor is visible regardless of the color of the
frame buffer image.
6.6 Gray scaler
A patented gray scale algorithm drives monochrome and color STN panels. This provides
15 gray scales for monochrome displays. For STN color displays, the three color
components (RGB) are gray scaled simultaneously. This results in 3375 (15x15x15)
colors being available. The gray scaler transforms each 4-bit gray value into a sequence
of activity-per-pixel over several frames, relying to some degree on the display
characteristics, to give the representation of gray scales and color.
6.7 Upper and lower panel formatters
Formatters are used in STN mode to convert the gray scaler output to a parallel format as
required by the display. For monochrome displays, this is either 4 or 8 bits wide, and for
worth of data in a repeating sequence.
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Table 258. Color display driven with 2 2/3 pixel data
Byte
CLD[7]
CLD[6]
CLD[5]
CLD[4]
CLD[3]
CLD[2]
CLD[1]
CLD[0]
0
1
2
P2[Green]
P5[Red]
P7[Blue]
P2[Red]
P4q[Blue]
P7[Green]
P1[Blue]
P4[Green]
P7[Red]
P1[Green]
P4[Red]
P6[Blue]
P1[Red]
P3[Blue]
P6[Green]
P0[Blue]
P3[Green]
P6[Red]
P0[Green]
P3[Red]
P5[Blue]
P0[Red]
P2[Blue]
P5[Green]
Each formatter consists of three 3-bit (RGB) shift left registers. RGB pixel data bit values
from the gray scaler are concurrently shifted into the respective registers. When enough
data is available, a byte is constructed by multiplexing the registered data to the correct bit
position to satisfy the RGB data pattern of LCD panel. The byte is transferred to the 3-byte
FIFO, which has enough space to store eight color pixels.
6.8 Panel clock generator
The output of the panel clock generator block is the panel clock, pin LCDDCLK. The panel
clock can be based on either the peripheral clock for the LCD block or the external clock
input for the LCD, pin LCDCLKIN. Whichever source is selected can be divided down in
order to produce the internal LCD clock, LCDCLK.
The panel clock generator can be programmed to output the LCD panel clock in the range
of LCDCLK/2 to LCDCLK/1025 to match the bpp data rate of the LCD panel being used.
The CLKSEL bit in the LCD_POL register determines whether the base clock used is
CCLK or the LCDCLKIN pin.
6.9 Timing controller
The primary function of the timing controller block is to generate the horizontal and vertical
timing panel signals. It also provides the panel bias and enable signals. These timings are
all register-programmable.
6.10 STN and TFT data select
Support is provided for passive Super Twisted Nematic (STN) and active Thin Film
Transistor (TFT) LCD display types:
6.10.1 STN displays
STN display panels require algorithmic pixel pattern generation to provide pseudo gray
scaling on monochrome displays, or color creation on color displays.
6.10.2 TFT displays
TFT display panels require the digital color value of each pixel to be applied to the display
data inputs.
6.11 Interrupt generation
Four interrupts are generated by the LCD controller, and a single combined interrupt. The
four interrupts are:
• Master bus error interrupt.
• Vertical compare interrupt.
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• Next base address update interrupt.
• FIFO underflow interrupt.
Each of the four individual maskable interrupts is enabled or disabled by changing the
mask bits in the LCD_INT_MSK register. These interrupts are also combined into a single
overall interrupt, which is asserted if any of the individual interrupts are both asserted and
unmasked. Provision of individual outputs in addition to a combined interrupt output
enables use of either a global interrupt service routine, or modular device drivers to
handle interrupts.
The status of the individual interrupt sources can be read from the LCD_INTRAW register.
6.11.1 Master bus error interrupt
The master bus error interrupt is asserted when an ERROR response is received by the
master interface during a transaction with a slave. When such an error is encountered, the
master interface enters an error state and remains in this state until clearance of the error
has been signaled to it. When the respective interrupt service routine is complete, the
master bus error interrupt may be cleared by writing a 1 to the BERIC bit in the
LCD_INTCLR register. This action releases the master interface from its ERROR state to
the start of FRAME state, and enables fresh frame of data display to be initiated.
6.11.2 Vertical compare interrupt
The vertical compare interrupt asserts when one of four vertical display regions, selected
using the LCD_CTRL register, is reached. The interrupt can be made to occur at the start
of:
• Vertical synchronization.
• Back porch.
• Active video.
• Front porch.
The interrupt may be cleared by writing a 1 to the VcompIC bit in the LCD_INTCLR
register.
6.11.2.1 Next base address update interrupt
The LCD next base address update interrupt asserts when either the LCDUPBASE or
LCDLPBASE values have been transferred to the LCDUPCURR or LCDLPCURR
incrementers respectively. This signals to the system that it is safe to update the
LCDUPBASE or the LCDLPBASE registers with new frame base addresses if required.
The interrupt can be cleared by writing a 1 to the LNBUIC bit in the LCD_INTCLR register
6.11.2.2 FIFO underflow interrupt
The FIFO underflow interrupt asserts when internal data is requested from an empty DMA
FIFO. Internally, upper and lower panel DMA FIFO underflow interrupt signals are
generated.
The interrupt can be cleared by writing a 1 to the FUFIC bit in the LCD_INTCLR register.
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6.12 LCD power up and power down sequence
The LCD controller requires the following power-up sequence to be performed:
1. When power is applied, the following signals are held LOW:
• LCDLP
• LCDDCLK
• LCDFP
• LCDENAB/ LCDM
• LCDVD[23:0]
• LCDLE
2. When LCD power is stabilized, a 1 is written to the LcdEn bit in the LCD_CTRL register.
This enables the following signals into their active states:
• LCDLP
• LCDDCLK
• LCDFP
• LCDENAB/ LCDM
• LCDLE
The LCDV[23:0] signals remain in an inactive state.
3. When the signals in step 2 have stabilized, the contrast voltage (not controlled or
supplied by the LCD controller) is applied to the LCD panel.
4. If required, a software or hardware timer can be used to provide the minimum display
specific delay time between application of the control signals and power to the panel
display. On completion of the time interval, power is applied to the panel by writing a 1 to
the LcdPwr bit within the LCD_CTRL register that, in turn, sets the LCDPWR signal high
and enables the LCDV[23:0] signals into their active states. The LCDPWR signal is
intended to be used to gate the power to the LCD panel.
The power-down sequence is the reverse of the above four steps and must be strictly
followed, this time, writing the respective register bits with 0.
Figure 12–40 shows the power-up and power-down sequences.
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LCD on sequence
Minimum 0 ms
LCD off sequence
Minimum 0 ms
LCD Power
Minimum 0 ms
Minimum 0 ms
LCDLP, LCDCP,
LCDFP, LCDAC,
LCDLE
Contrast Voltage
LCDPWR,
LCD[23:0]
Display specific delay
Display specific delay
Fig 40. Power up and power down sequences
7. Register description
their functions. Following the table are details for each register.
Table 259. Summary of LCD controller registers
Address
Name
Description
Reset Access
value
0xE01F C1B8
0xFFE1 0000
0xFFE1 0004
0xFFE1 0008
0xFFE1 000C
0xFFE1 0010
0xFFE1 0014
0xFFE1 0018
0xFFE1 001C
0xFFE1 0020
0xFFE1 0024
0xFFE1 0028
0xFFE1 002C
0xFFE1 0030
LCD_CFG
LCD Configuration and clocking control
Horizontal Timing Control register
Vertical Timing Control register
Clock and Signal Polarity Control register
Line End Control register
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
LCD_TIMH
LCD_TIMV
LCD_POL
LCD_LE
LCD_UPBASE
LCD_LPBASE
LCD_CTRL
Upper Panel Frame Base Address register
Lower Panel Frame Base Address register
LCD Control register
LCD_INTMSK
LCD_INTRAW
LCD_INTSTAT
LCD_INTCLR
LCD_UPCURR
LCD_LPCURR
Interrupt Mask register
Raw Interrupt Status register
Masked Interrupt Status register
Interrupt Clear register
RO
WO
RO
Upper Panel Current Address Value register
Lower Panel Current Address Value register
256x16-bit Color Palette registers
Cursor Image registers
RO
0xFFE1 0200 - 0xFFE1 03FC LCD_PAL
0xFFE1 0800 - 0xFFE1 0BFC CRSR_IMG
R/W
R/W
R/W
0xFFE1 0C00
CRSR_CTRL
Cursor Control register
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Chapter 12: LPC24XX LCD controller
Table 259. Summary of LCD controller registers …continued
Address
Name
Description
Reset Access
value
[1]
0xFFE1 0C04
0xFFE1 0C08
0xFFE1 0C0C
0xFFE1 0C10
0xFFE1 0C14
0xFFE1 0C20
0xFFE1 0C24
0xFFE1 0C28
0xFFE1 0C2C
CRSR_CFG
Cursor Configuration register
Cursor Palette register 0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
R/W
R/W
R/W
R/W
R/W
R/W
WO
RO
CRSR_PAL0
CRSR_PAL1
CRSR_XY
Cursor Palette register 1
Cursor XY Position register
Cursor Clip Position register
Cursor Interrupt Mask register
Cursor Interrupt Clear register
Cursor Raw Interrupt Status register
Cursor Masked Interrupt Status register
CRSR_CLIP
CRSR_INTMSK
CRSR_INTCLR
CRSR_INTRAW
CRSR_INTSTAT
RO
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
7.1 LCD Configuration register (LCD_CFG, RW - 0xE01F C1B8)
The LCD_CFG register controls the prescaling of the clock used for LCD data generation.
Table 260. LCD Configuration register (LCD_CFG, RW - 0xE01F C1B8)
Bits
31:5
4:0
Function
reserved
CLKDIV
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
LCD panel clock prescaler selection.
0x0
The value in the this register plus 1 is used to divide the selected
input clock (see the CLKSEL bit in the LCD_POL register), to
produce the panel clock.
7.2 Horizontal Timing register (LCD_TIMH, RW - 0xFFE1 0000)
The LCD_TIMH register controls the Horizontal Synchronization pulse Width (HSW), the
Horizontal Front Porch (HFP) period, the Horizontal Back Porch (HBP) period, and the
Pixels-Per-Line (PPL).
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Table 261. Horizontal Timing register (LCD_TIMH, RW - 0xFFE1 0000)
Bits
Function
Description
Reset
value
31:24 HBP
Horizontal back porch.
0x0
0x0
The 8-bit HBP field is used to specify the number of pixel clock
periods inserted at the beginning of each line or row of pixels.
After the line clock for the previous line has been deasserted, the
value in HBP counts the number of pixel clocks to wait before
starting the next display line. HBP can generate a delay of 1-256
pixel clock cycles. Program with desired value minus 1.
23:16 HFP
Horizontal front porch.
The 8-bit HFP field sets the number of pixel clock intervals at the
end of each line or row of pixels, before the LCD line clock is
pulsed. When a complete line of pixels is transmitted to the LCD
driver, the value in HFP counts the number of pixel clocks to wait
before asserting the line clock. HFP can generate a period of
1-256 pixel clock cycles. Program with desired value minus 1.
15:8
7:2
HSW
PPL
Horizontal synchronization pulse width.
0x0
0x0
The 8-bit HSW field specifies the pulse width of the line clock in
passive mode, or the horizontal synchronization pulse in active
mode. Program with desired value minus 1.
Pixels-per-line.
The PPL bit field specifies the number of pixels in each line or
row of the screen. PPL is a 6-bit value that represents between
16 and 1024 pixels per line. PPL counts the number of pixel
clocks that occur before the HFP is applied.
Program the value required divided by 16, minus 1. Actual
pixels-per-line = 16 * (PPL + 1). For example, to obtain 320
pixels per line, program PPL as (320/16) -1 = 19.
1:0
reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
7.2.1 Horizontal timing restrictions
DMA requests new data at the start of a horizontal display line. Some time must be
allowed for the DMA transfer and for data to propagate down the FIFO path in the LCD
interface. The data path latency forces some restrictions on the usable minimum values
for horizontal porch width in STN mode. The minimum values are HSW = 2 and HBP = 2.
Single panel mode:
• HSW = 3 pixel clock cycles ???
• HBP = 5 pixel clock cycles
• HFP = 5 pixel clock cycles
• Panel Clock Divisor (PCD) = 1 (LCDCLK / 3)
Dual panel mode:
• HSW = 3 pixel clock cycles ???
• HBP = 5 pixel clock cycles
• HFP = 5 pixel clock cycles
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• PCD = 5 (LCDCLK / 7)
If enough time is given at the start of the line, for example, setting HSW = 6, HBP = 10,
data does not corrupt for PCD = 4, the minimum value.
7.3 Vertical Timing register (LCD_TIMV, RW - 0xFFE1 0004)
The LCD_TIMV register controls the Vertical Synchronization pulse Width (VSW), the
Vertical Front Porch (VFP) period, the Vertical Back Porch (VBP) period, and the
Lines-Per-Panel (LPP).
Table 262. Vertical Timing register (LCD_TIMV, RW - 0xFFE1 0004)
Bits
Function
Description
Reset
value
31:24 VBP
Vertical back porch.
0x0
This is the number of inactive lines at the start of a frame, after
the vertical synchronization period. The 8-bit VBP field specifies
the number of line clocks inserted at the beginning of each
frame. The VBP count starts immediately after the vertical
synchronization signal for the previous frame has been negated
for active mode, or the extra line clocks have been inserted as
specified by the VSW bit field in passive mode. After this has
occurred, the count value in VBP sets the number of line clock
periods inserted before the next frame. VBP generates 0–255
extra line clock cycles. Program to zero on passive displays for
improved contrast.
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Table 262. Vertical Timing register (LCD_TIMV, RW - 0xFFE1 0004)
Bits
Function
Description
Reset
value
23:16 VFP
Vertical front porch.
0x0
This is the number of inactive lines at the end of a frame, before
the vertical synchronization period. The 8-bit VFP field specifies
the number of line clocks to insert at the end of each frame.
When a complete frame of pixels is transmitted to the LCD
display, the value in VFP is used to count the number of line
clock periods to wait.
After the count has elapsed, the vertical synchronization signal,
LCDFP, is asserted in active mode, or extra line clocks are
inserted as specified by the VSW bit-field in passive mode. VFP
generates 0–255 line clock cycles. Program to zero on passive
displays for improved contrast.
15:10 VSW
Vertical synchronization pulse width.
0x0
This is the number of horizontal synchronization lines. The 6-bit
VSW field specifies the pulse width of the vertical
synchronization pulse. Program the register with the number of
lines required, minus one.
The number of horizontal synchronization lines must be small
(for example, program to zero) for passive STN LCDs. The
higher the value the worse the contrast on STN LCDs.
9:0
LPP
Lines per panel.
0x0
This is the number of active lines per screen. The LPP field
specifies the total number of lines or rows on the LCD panel
being controlled. LPP is a 10-bit value allowing between 1 and
1024 lines. Program the register with the number of lines per
LCD panel, minus 1. For dual panel displays, program the
register with the number of lines on each of the upper and lower
panels.
7.4 Clock and Signal Polarity register (LCD_POL, RW - 0xFFE1 0008)
The LCD_POL register controls various details of clock timing and signal polarity.
Table 263. Clock and Signal Polarity register (LCD_POL, RW - 0xFFE1 0008)
Bits
Function
Description
Reset
value
31:27 PCD_HI
Upper five bits of panel clock divisor.
See description for PCD_LO, in bits [4:0] of this register.
Bypass pixel clock divider.
0x0
26
BCD
0x0
Setting this to 1 bypasses the pixel clock divider logic. This is
mainly used for TFT displays.
25:16 CPL
Clocks per line.
0x0
This field specifies the number of actual LCDDCLK clocks to the
LCD panel on each line. This is the number of PPL divided by
either 1 (for TFT), 4 or 8 (for monochrome passive), 2 2/3 (for
color passive), minus one. This must be correctly programmed in
addition to the PPL bit in the LCD_TIMH register for the LCD
display to work correctly.
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Table 263. Clock and Signal Polarity register (LCD_POL, RW - 0xFFE1 0008)
Bits
Function
reserved
IOE
Description
Reset
value
15
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
14
Invert output enable.
0x0
This bit selects the active polarity of the output enable signal in
TFT mode. In this mode, the LCDENAB pin is used as an enable
that indicates to the LCD panel when valid display data is
available. In active display mode, data is driven onto the LCD
data lines at the programmed edge of LCDDCLK when
LCDENAB is in its active state.
0 = LCDENAB output pin is active HIGH in TFT mode.
1 = LCDENAB output pin is active LOW in TFT mode.
Invert panel clock.
13
IPC
0x0
The IPC bit selects the edge of the panel clock on which pixel
data is driven out onto the LCD data lines.
0 = Data is driven on the LCD data lines on the rising edge of
LCDDCLK.
1 = Data is driven on the LCD data lines on the falling edge of
LCDDCLK.
12
11
IHS
IVS
Invert horizontal synchronization.
0x0
0x0
The IHS bit inverts the polarity of the LCDLP signal.
0 = LCDLP pin is active HIGH and inactive LOW.
1 = LCDLP pin is active LOW and inactive HIGH.
Invert vertical synchronization.
The IVS bit inverts the polarity of the LCDFP signal.
0 = LCDFP pin is active HIGH and inactive LOW.
1 = LCDFP pin is active LOW and inactive HIGH.
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Table 263. Clock and Signal Polarity register (LCD_POL, RW - 0xFFE1 0008)
Bits
Function
Description
Reset
value
10:6
ACB
AC bias pin frequency.
0x0
The AC bias pin frequency is only applicable to STN displays.
These require the pixel voltage polarity to periodically reverse to
prevent damage caused by DC charge accumulation. Program
this field with the required value minus one to apply the number
of line clocks between each toggle of the AC bias pin,
LCDENAB. This field has no effect if the LCD is operating in TFT
mode, when the LCDENAB pin is used as a data enable signal.
5
CLKSEL
PCD_LO
Clock Select.
0x0
0x0
This bit controls the selection of the source for LCDCLK.
0 = the clock source for the LCD block is CCLK.
1 = the clock source for the LCD block is LCDDCLK.
Lower five bits of panel clock divisor.
4:0
The ten-bit PCD field, comprising PCD_HI (bits 31:27 of this
register) and PCD_LO, is used to derive the LCD panel clock
frequency LCDDCLK from the input clock, LCDDCLK =
LCDCLK/(PCD+2).
For monochrome STN displays with a 4 or 8-bit interface, the
panel clock is a factor of four and eight down from the actual
individual pixel clock rate. For color STN displays, 22/3 pixels
are output per LCDDCLK cycle, so the panel clock is 0.375 times
the pixel rate.
For TFT displays, the pixel clock divider can be bypassed by
setting the BCD bit in this register.
Note: data path latency forces some restrictions on the usable
minimum values for the panel clock divider in STN modes:
Single panel color mode, PCD = 1 (LCDDCLK = LCDCLK/3).
Dual panel color mode, PCD = 4 (LCDDCLK = LCDCLK/6).
Single panel monochrome 4-bit interface mode, PCD =
2(LCDDCLK = LCDCLK/4).
Dual panel monochrome 4-bit interface mode and single panel
monochrome 8-bit interface mode, PCD = 6(LCDDCLK =
LCDCLK/8).
Dual panel monochrome 8-bit interface mode, PCD =
14(LCDDCLK = LCDCLK/16).
7.5 Line End Control register (LCD_LE, RW - 0xFFE1 000C)
The LCD_LE register controls the enabling of line-end signal LCDLE. When enabled, a
positive pulse, four LCDCLK periods wide, is output on LCDLE after a programmable
delay, LED, from the last pixel of each display line. If the line-end signal is disabled it is
held permanently LOW.
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Table 264. Line End Control register (LCD_LE, RW - 0xFFE1 000C)
Bits
Function
Description
Reset
value
31:17 reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
16
LEE
LCD Line end enable.
0x0
0 = LCDLE disabled (held LOW).
1 = LCDLE signal active.
15:7
6:0
reserved
LED
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Line-end delay.
0x0
Controls Line-end signal delay from the rising-edge of the last
panel clock, LCDDCLK. Program with number of LCDCLK clock
periods minus 1.
7.6 Upper Panel Frame Base Address register (LCD_UPBASE, RW -
0xFFE1 0010)
The LCD_UPBASE register is the color LCD upper panel DMA base address register, and
is used to program the base address of the frame buffer for the upper panel. LCDUPBase
(and LCDLPBase for dual panels) must be initialized before enabling the LCD controller.
The base address must be doubleword aligned.
Optionally, the value may be changed mid-frame to create double-buffered video displays.
These registers are copied to the corresponding current registers at each LCD vertical
synchronization. This event causes the LNBU bit and an optional interrupt to be
generated. The interrupt can be used to reprogram the base address when generating
double-buffered video.
Table 265. Upper Panel Frame Base register (LCD_UPBASE, RW - 0xFFE1 0010)
Bits
Function
Description
Reset
value
31:3
LCDUPBASE LCD upper panel base address.
This is the start address of the upper panel frame data in
0x0
memory and is doubleword aligned.
2:0
reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
7.7 Lower Panel Frame Base Address register (LCD_LPBASE, RW -
0xFFE1 0014)
The LCD_LPBASE register is the color LCD lower panel DMA base address register, and
is used to program the base address of the frame buffer for the lower panel. LCDLPBase
must be initialized before enabling the LCD controller. The base address must be
doubleword aligned.
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Optionally, the value may be changed mid-frame to create double-buffered video displays.
These registers are copied to the corresponding current registers at each LCD vertical
synchronization. This event causes the LNBU bit and an optional interrupt to be
generated. The interrupt can be used to reprogram the base address when generating
double-buffered video.
Table 266. Lower Panel Frame Base register (LCD_LPBASE, RW - 0xFFE1 0014)
Bits
Function
Description
Reset
value
31:3
LCDLPBASE LCD lower panel base address.
This is the start address of the lower panel frame data in memory
0x0
and is doubleword aligned.
2:0
reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
7.8 LCD Control register (LCD_CTRL, RW - 0xFFE1 0018)
The LCD_CTRL register controls the LCD operating mode and the panel pixel
parameters.
Table 267. LCD Control register (LCD_CTRL, RW - 0xFFE1 0018)
Bits
Function
Description
Reset
value
31:17 reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
16
WATERMARK LCD DMA FIFO watermark level.
0x0
Controls when DMA requests are generated:
0 = An LCD DMA request is generated when either of the DMA
FIFOs have four or more empty locations.
1 = An LCD DMA request is generated when either of the DMA
FIFOs have eight or more empty locations.
15:14 reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
13:12 LcdVComp
LCD Vertical Compare Interrupt.
Generate VComp interrupt at:
00 = start of vertical synchronization.
01 = start of back porch.
0x0
10 = start of active video.
11 = start of front porch.
11
LcdPwr
LCD power enable.
0x0
0 = power not gated through to LCD panel and LCDV[23:0]
signals disabled, (held LOW).
1 = power gated through to LCD panel and LCDV[23:0] signals
enabled, (active).
See LCD power up and power down sequence for details on
LCD power sequencing.
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Table 267. LCD Control register (LCD_CTRL, RW - 0xFFE1 0018)
Bits
Function
Description
Reset
value
10
BEPO
Big-Endian Pixel Ordering.
0x0
Controls pixel ordering within a byte:
0 = little-endian ordering within a byte.
1 = big-endian pixel ordering within a byte.
The BEPO bit selects between little and big-endian pixel packing
for 1, 2, and 4 bpp display modes, it has no effect on 8 or 16 bpp
pixel formats.
See Pixel serializer for more information on the data format.
Big-endian Byte Order.
9
BEBO
0x0
Controls byte ordering in memory:
0 = little-endian byte order.
1 = big-endian byte order.
8
7
BGR
Color format selection.
0x0
0x0
0 = RGB: normal output.
1 = BGR: red and blue swapped.
Single or Dual LCD panel selection.
STN LCD interface is:
LcdDual
0 = single-panel.
1 = dual-panel.
6
5
LcdMono8
Monochrome LCD interface width.
0x0
0x0
This bit controls whether a monochrome STN LCD uses a 4 or
8-bit parallel interface. It has no meaning in other modes and
must be programmed to zero.
0 = monochrome LCD uses a 4-bit interface.
1 = monochrome LCD uses a 8-bit interface.
LCD panel TFT type selection.
LcdTFT
0 = LCD is an STN display. Use gray scaler.
1 = LCD is a TFT display. Do not use gray scaler.
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Table 267. LCD Control register (LCD_CTRL, RW - 0xFFE1 0018)
Bits
Function
Description
Reset
value
4
LcdBW
STN LCD monochrome/color selection.
0 = STN LCD is color.
1 = STN LCD is monochrome.
This bit has no meaning in TFT mode.
LCD bits per pixel:
0x0
0x0
3:1
LcdBpp
Selects the number of bits per LCD pixel:
000 = 1 bpp.
001 = 2 bpp.
010 = 4 bpp.
011 = 8 bpp.
100 = 16 bpp.
101 = 24 bpp (TFT panel only).
110 = 16 bpp, 5:6:5 mode.
111 = 12 bpp, 4:4:4 mode.
LCD enable control bit.
0
LcdEn
0x0
0 = LCD disabled. Signals LCDLP, LCDDCLK, LCDFP,
LCDENAB, and LCDLE are low.
1 = LCD enabled. Signals LCDLP, LCDDCLK, LCDFP,
LCDENAB, and LCDLE are high.
See LCD power up and power down sequence for details on
LCD power sequencing.
7.9 Interrupt Mask register (LCD_INTMSK, RW - 0xFFE1 001C)
The LCD_INTMSK register controls whether various LCD interrupts occur.Setting bits in
this register enables the corresponding raw interrupt LCD_INTRAW status bit values to be
passed to the LCD_INTSTAT register for processing as interrupts.
Table 268. Interrupt Mask register (LCD_INTMSK, RW - 0xFFE1 001C)
Bits
31:5
4
Function
reserved
BERIM
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
AHB master error interrupt enable.
0x0
0: The AHB Master error interrupt is disabled.
1: Interrupt will be generated when an AHB Master error occurs.
Vertical compare interrupt enable.
3
VCompIM
0x0
0: The vertical compare time interrupt is disabled.
1: Interrupt will be generated when the vertical compare time (as
defined by LcdVComp field in the LCD_CTRL register) is
reached.
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Table 268. Interrupt Mask register (LCD_INTMSK, RW - 0xFFE1 001C)
Bits
Function
Description
Reset
value
2
LNBUIM
LCD next base address update interrupt enable.
0: The base address update interrupt is disabled.
0x0
1: Interrupt will be generated when the LCD base address
registers have been updated from the next address registers.
1
0
FUFIM
FIFO underflow interrupt enable.
0x0
-
0: The FIFO underflow interrupt is disabled.
1: Interrupt will be generated when the FIFO underflows.
reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
7.10 Raw Interrupt Status register (LCD_INTRAW, RW - 0xFFE1 0020)
The LCD_INTRAW register contains status flags for various LCD controller events. These
flags can generate an interrupts if enabled by mask bits in the LCD_INTMSK register.
Table 269. Raw Interrupt Status register (LCD_INTRAW, RW - 0xFFE1 0020)
Bits
31:5
4
Function
reserved
BERRAW
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
AHB master bus error raw interrupt status.
0x0
Set when the AHB master interface receives a bus error
response from a slave.
Generates an interrupt if the BERIM bit in the LCD_INTMSK
register is set.
3
2
VCompRIS
LNBURIS
Vertical compare raw interrupt status.
0x0
0x0
Set when one of the four vertical regions is reached, as selected
by the LcdVComp bits in the LCD_CTRL register.
Generates an interrupt if the VCompIM bit in the LCD_INTMSK
register is set.
LCD next address base update raw interrupt status.
Mode dependent. Set when the current base address registers
have been successfully updated by the next address registers.
Signifies that a new next address can be loaded if double
buffering is in use.
Generates an interrupt if the LNBUIM bit in the LCD_INTMSK
register is set.
1
0
FUFRIS
reserved
FIFO underflow raw interrupt status.
Set when either the upper or lower DMA FIFOs have been read
accessed when empty causing an underflow condition to occur.
Generates an interrupt if the FUFIM bit in the LCD_INTMSK
register is set.
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
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7.11 Masked Interrupt Status register (LCD_INTSTAT, RW - 0xFFE1 0024)
The LCD_INTSTAT register is Read-Only, and contains a bit-by-bit logical AND of the
LCD_INTRAW register and the LCD_INTMASK register. A logical OR of all interrupts is
provided to the system interrupt controller.
Table 270. Masked Interrupt Status register (LCD_INTSTAT, RW - 0xFFE1 0024)
Bits
31:5
4
Function
reserved
BERMIS
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
AHB master bus error masked interrupt status.
0x0
Set when the both the BERRAW bit in the LCD_INTRAW
register and the BERIM bit in the LCD_INTMSK register are set.
3
2
VCompMIS
LNBUMIS
Vertical compare masked interrupt status.
0x0
0x0
Set when the both the VCompRIS bit in the LCD_INTRAW
register and the VCompIM bit in the LCD_INTMSK register are
set.
LCD next address base update masked interrupt status.
Set when the both the LNBURIS bit in the LCD_INTRAW
register and the LNBUIM bit in the LCD_INTMSK register are
set.
1
0
FUFMIS
reserved
FIFO underflow masked interrupt status.
0x0
-
Set when the both the FUFRIS bit in the LCD_INTRAW register
and the FUFIM bit in the LCD_INTMSK register are set.
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
7.12 Interrupt Clear register (LCD_INTCLR, RW - 0xFFE1 0028)
The LCD_INTCLR register is Write-Only. Writing a logic 1 to the relevant bit clears the
corresponding interrupt.
Table 271. Interrupt Clear register (LCD_INTCLR, RW - 0xFFE1 0028)
Bits
31:5
4
Function
reserved
BERIC
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
AHB master error interrupt clear.
0x0
Writing a 1 to this bit clears the AHB master error interrupt.
Vertical compare interrupt clear.
3
VCompIC
0x0
Writing a 1 to this bit clears the vertical compare interrupt.
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Table 271. Interrupt Clear register (LCD_INTCLR, RW - 0xFFE1 0028)
Bits
Function
Description
Reset
value
2
LNBUIC
LCD next address base update interrupt clear.
0x0
Writing a 1 to this bit clears the LCD next address base update
interrupt.
1
0
FUFIC
FIFO underflow interrupt clear.
0x0
-
Writing a 1 to this bit clears the FIFO underflow interrupt.
reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
7.13 Upper Panel Current Address register (LCD_UPCURR, RW - 0xFFE1
002C)
The LCD_UPCURR register is Read-Only, and contains an approximate value of the
upper panel data DMA address when read.
Note: This register can change at any time and therefore can only be used as a rough
indication of display position.
Table 272. Upper Panel Current Address register (LCD_UPCURR, RW - 0xFFE1 002C)
Bits
Function
Description
Reset
value
31:0
LCDUPCURR LCD Upper Panel Current Address.
Contains the current LCD upper panel data DMA address.
0x0
7.14 Lower Panel Current Address register (LCD_LPCURR, RW - 0xFFE1
0030)
The LCD_LPCURR register is Read-Only, and contains an approximate value of the lower
panel data DMA address when read.
Note: This register can change at any time and therefore can only be used as a rough
indication of display position.
Table 273. Lower Panel Current Address register (LCD_LPCURR, RW - 0xFFE1 0030)
Bits
Function
Description
Reset
value
31:0
LCDLPCURR LCD Lower Panel Current Address.
Contains the current LCD lower panel data DMA address.
0x0
7.15 Color Palette registers (LCD_PAL, RW - 0xFFE1 0200 to 0xFFE1 03FC)
The LCD_PAL register contain 256 palette entries organized as 128 locations of two
entries per word.
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Each word location contains two palette entries. This means that 128 word locations are
used for the palette. When configured for little-endian byte ordering, bits [15:0] are the
lower numbered palette entry and [31:16] are the higher numbered palette entry. When
configured for big-endian byte ordering this is reversed, because bits [31:16] are the low
numbered palette entry and [15:0] are the high numbered entry.
Note: Only TFT displays use all of the palette entry bits.
Table 274. Color Palette registers (LCD_PAL, RW - 0xFFE1 0200 to 0xFFE1 03FC)
Bits
Function
Description
Reset
value
31
I
Intensity / unused bit.
0x0
Can be used as the LSB of the R, G, and B inputs to a 6:6:6 TFT
display, doubling the number of colors to 64K, where each color
has two different intensities.
30:26 B[4:0]
25:21 G[4:0]
20:16 R[4:0]
Blue palette data.
Green palette data.
Red palette data.
0x0
0x0
0x0
For STN displays, only the four MSBs, bits [4:1], are used. For
monochrome displays only the red palette data is used. All of the
palette registers have the same bit fields.
15
I
Intensity / unused bit.
0x0
Can be used as the LSB of the R, G, and B inputs to a 6:6:6 TFT
display, doubling the number of colors to 64K, where each color
has two different intensities.
14:10 B[4:0]
Blue palette data.
Green palette data.
Red palette data.
0x0
0x0
0x0
9:5
4:0
G[4:0]
R[4:0]
For STN displays, only the four MSBs, bits [4:1], are used. For
monochrome displays only the red palette data is used. All of the
palette registers have the same bit fields.
7.16 Cursor Image registers (CRSR_IMG, RW - 0xFFE1 0800 to 0xFFE1
0BFC)
The CRSR_IMG register area contains 256-word wide values which are used to define
the image or images overlaid on the display by the hardware cursor mechanism. The
image must always be stored in LBBP mode (little-endian byte, big-endian pixel) mode, as
described in Image format on page 2-19. Two bits are used to encode color and
transparency for each pixel in the cursor.
Depending on the state of bit 0 in the CRSR_CFG register (see Cursor Configuration
register description), the cursor image RAM contains either four 32x32 cursor images, or
a single 64x64 cursor image.
The two colors defined for the cursor are mapped onto values from the CRSR_PAL0 and
CRSR_PAL0 registers (see Cursor Palette register descriptions).
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Table 275. Cursor Image registers (CRSR_IMG, RW - 0xFFE1 0800 to 0xFFE1 0BFC)
Bits
Function
Description
Reset
value
31:0
CRSR_IMG
Cursor Image data.
0x0
The 256 words of the cursor image registers define the
appearance of either one 64x64 cursor, or 4 32x32 cursors.
7.17 Cursor Control register (CRSR_CTRL, RW - 0xFFE1 0C00)
The CRSR_CTRL register provides access to frequently used cursor functions, such as
the display on/off control for the cursor, and the cursor number.
If a 32x32 cursor is selected, one of four 32x32 cursors can be enabled. The images each
occupy one quarter of the image memory, with Cursor0 from location 0, followed by
Cursor1 from address 0x100, Cursor2 from 0x200 and Cursor3 from 0x300. If a 64x64
cursor is selected only one cursor fits in the image buffer, and no selection is possible.
Similar frame synchronization rules apply to the cursor number as apply to the cursor
coordinates. If CrsrFramesync is 1, the displayed cursor image is only changed during the
vertical frame blanking period. If CrsrFrameSync is 0, the cursor image index is changed
immediately, even if the cursor is currently being scanned.
Table 276. Cursor Control register (CRSR_CTRL, RW - 0xFFE1 0C00)
Bits
31:6
5:4
Function
Description
Reset
value
reserved
Reserved, user software should not write ones to reserved bits. 0x0
The value read from a reserved bit is not defined.
CrsrNum[1:0] Cursor image number.
If the selected cursor size is 6x64, this field has no effect. If the
0x0
selected cursor size is 32x32:
00 = Cursor0.
01 = Cursor1.
10 = Cursor2.
11 = Cursor3.
3:1
0
reserved
CrsrOn
Reserved, user software should not write ones to reserved bits. 0x0
The value read from a reserved bit is not defined.
Cursor enable.
0x0
0 = Cursor is not displayed.
1 = Cursor is displayed.
7.18 Cursor Configuration register (CRSR_CFG, RW - 0xFFE1 0C04)
The CRSR_CFG register provides overall configuration information for the hardware
cursor.
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Table 277. Cursor Configuration register (CRSR_CFG, RW - 0xFFE1 0C04)
Bits
31:2
1
Function
Description
Reset
value
reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
FrameSync
Cursor frame synchronization type.
0x0
0 = Cursor coordinates are asynchronous.
1 = Cursor coordinates are synchronized to the frame
synchronization pulse.
0
CrsrSize
Cursor size selection.
0x0
0 = 32x32 pixel cursor. Allows for 4 defined cursors.
1 = 64x64 pixel cursor.
7.19 Cursor Palette register 0 (CRSR_PAL0, RW - 0xFFE1 0C08)
The cursor palette registers provide color palette information for the visible colors of the
cursor. Color0 maps through CRSR_PAL0.
The register provides 24-bit RGB values that are displayed according to the abilities of the
LCD panel in the same way as the frame-buffers palette output is displayed.
In monochrome STN mode, only the upper 4 bits of the Red field are used. In STN color
mode, the upper 4 bits of the Red, Blue, and Green fields are used. In 24 bits per pixel
mode, all 24 bits of the palette registers are significant.
Table 278. Cursor Palette register 0 (CRSR_PAL0, RW - 0xFFE1 0C08)
Bits
Function
Description
Reset
value
31:24 reserved
23:16 Blue
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Blue color component.
Green color component
Red color component
0x0
0x0
0x0
15:8
7:0
Green
Red
7.20 Cursor Palette register 1 (CRSR_PAL1, RW - 0xFFE1 0C0C)
The cursor palette registers provide color palette information for the visible colors of the
cursor. Color1 maps through CRSR_PAL1.
The register provides 24-bit RGB values that are displayed according to the abilities of the
LCD panel in the same way as the frame-buffers palette output is displayed.
In monochrome STN mode, only the upper 4 bits of the Red field are used. In STN color
mode, the upper 4 bits of the Red, Blue, and Green fields are used. In 24 bits per pixel
mode, all 24 bits of the palette registers are significant.
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Table 279. Cursor Palette register 1 (CRSR_PAL1, RW - 0xFFE1 0C0C)
Bits
Function
Description
Reset
value
31:24 reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
23:16 Blue
Blue color component.
Green color component
Red color component
0x0
0x0
0x0
15:8
7:0
Green
Red
7.21 Cursor XY Position register (CRSR_XY, RW - 0xFFE1 0C10)
The CRSR_XY register defines the distance of the top-left edge of the cursor from the
top-left side of the cursor overlay. refer to the section on Cursor Clipping for more details.
If the FrameSync bit in the CRSR_CFG register is 0, the cursor position changes
immediately, even if the cursor is currently being scanned. If Framesync is 1, the cursor
position is only changed during the next vertical frame blanking period.
Table 280. Cursor XY Position register (CRSR_XY, RW - 0xFFE1 0C10)
Bits
Function
Description
Reset
value
31:26 reserved
25:16 CrsrY
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Y ordinate of the cursor origin measured in pixels.
0x0
When 0, the top edge of the cursor is at the top of the display.
15:10 reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
9:0
CrsrX
X ordinate of the cursor origin measured in pixels.
0x0
When 0, the left edge of the cursor is at the left of the display.
7.22 Cursor Clip Position register (CRSR_CLIP, RW - 0xFFE1 0C14)
The CRSR_CLIP register defines the distance from the top-left edge of the cursor image,
to the first displayed pixel in the cursor image.
Different synchronization rules apply to the Cursor Clip registers than apply to the cursor
coordinates. If the FrameSync bit in the CRSR_CFG register is 0, the cursor clip point is
changed immediately, even if the cursor is currently being scanned.
If the Framesync bit in the CRSR_CFG register is 1, the displayed cursor image is only
changed during the vertical frame blanking period, providing that the cursor position has
been updated since the Clip register was programmed. When programming, the Clip
register must be written before the Position register (ClcdCrsrXY) to ensure that in a given
frame, the clip and position information is coherent.
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Table 281. Cursor Clip Position register (CRSR_CLIP, RW - 0xFFE1 0C14)
Bits
Function
Description
Reset
value
31:14 reserved
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
13:8
CrsrClipY
Cursor clip position for Y direction.
0x0
Distance from the top of the cursor image to the first displayed
pixel in the cursor.
When 0, the first displayed pixel is from the top line of the cursor
image.
7:6
5:0
reserved
CrsrClipX
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Cursor clip position for X direction.
0x0
Distance from the left edge of the cursor image to the first
displayed pixel in the cursor.
When 0, the first pixel of the cursor line is displayed.
7.23 Cursor Interrupt Mask register (CRSR_INTMSK, RW - 0xFFE1 0C20)
The CRSR_INTMSK register is used to enable or disable the cursor from interrupting the
processor.
Table 282. Cursor Interrupt Mask register (CRSR_INTMSK, RW - 0xFFE1 0C20)
Bits
31:1
0
Function
reserved
CrsrIM
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Cursor interrupt mask.
0x0
When clear, the cursor never interrupts the processor.
When set, the cursor interrupts the processor immediately after
reading of the last word of cursor image.
7.24 Cursor Interrupt Clear register (CRSR_INTCLR, RW - 0xFFE1 0C24)
The CRSR_INTCLR register is used by software to clear the cursor interrupt status and
the cursor interrupt signal to the processor.
Table 283. Cursor Interrupt Clear register (CRSR_INTCLR, RW - 0xFFE1 0C24)
Bits
31:1
0
Function
reserved
CrsrIC
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Cursor interrupt clear.
0x0
Writing a 0 to this bit has no effect.
Writing a 1 to this bit causes the cursor interrupt status to be
cleared.
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7.25 Cursor Raw Interrupt Status register (CRSR_INTRAW, RW - 0xFFE1
0C28)
The CRSR_INTRAW register is set to indicate a cursor interrupt. When enabled via the
CrsrIM bit in the CRSR_INTMSK register, provides the interrupt to the system interrupt
controller.
Table 284. Cursor Raw Interrupt Status register (CRSR_INTRAW, RW - 0xFFE1 0C28)
Bits
31:1
0
Function
reserved
CrsrRIS
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Cursor raw interrupt status.
0x0
The cursor interrupt status is set immediately after the last data
is read from the cursor image for the current frame.
This bit is cleared by writing to the CrsrIC bit in the
CRSR_INTCLR register.
7.26 Cursor Masked Interrupt Status register (CRSR_INTSTAT, RW -
0xFFE1 0C2C)
The CRSR_INTSTAT register is set to indicate a cursor interrupt providing that the
interrupt is not masked in the CRSR_INTMSK register.
Table 285. Cursor Masked Interrupt Status register (CRSR_INTSTAT, RW - 0xFFE1 0C2C)
Bits
31:1
0
Function
reserved
CrsrMIS
Description
Reset
value
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Cursor masked interrupt status.
0x0
The cursor interrupt status is set immediately after the last data
read from the cursor image for the current frame, providing that
the corresponding bit in the CRSR_INTMSK register is set.
The bit remains clear if the CRSR_INTMSK register is clear.
This bit is cleared by writing to the CRSR_INTCLR register.
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Chapter 12: LPC24XX LCD controller
8. LCD timing diagrams
one horizontal line
pixel clock
(internal)
LCD_TIMH (HSW)
LCDLP
(line synch
pulse)
suppressed
during LCDLP
LCDDCLK
(panel clock)
16 × LCD_TIMH(PPL) + 1
LCD_TIMH (HFP)
LCD_TIMH (HBP)
horizontal back porch
(defined in pixel clocks)
horizontal front porch
(defined in pixel clocks)
LCDVD[15:0]
(panel data)
one horizontal line of LCD data
(1) The active data lines will vary with the type of STN panel (4-bit, 8-bit, color, mono) and with single or dual frames.
(2) The LCD panel clock is selected and scaled by the LCD controller and used to produce LCDCLK.
(3) The duration of the LCDLP signal is controlled by the HSW field in the LCD_TIMH register.
(4) The Polarity of the LCDLP signal is determined by the IHS bit in the LCD_POL register.
Fig 41. Horizontal timing for STN displays
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Chapter 12: LPC24XX LCD controller
one frame
LCDDCLK
(panel clock)
panel data clock active
LCD_TIMV (VSW)
LCDFP
(vertical synch
pulse)
LCD_TIMV (VBP)
LCD_TIMV(LPP)
LCD_TIMV (VFP)
back porch
(defined in line clocks)
all horizontal lines for one frame
front porch
(defined in line clocks)
pixel data
and horizontal
controls for one
frame
see horizontal timing for STN displays
(1) Signal polarities may vary for some displays.
Fig 42. Vertical timing for STN displays
one horizontal line
pixel clock
(internal)
LCD_TIMH (HSW)
LCDLP
(lhorizontal
synch pulse)
LCDDCLK
(panel clock)
LCD_TIMH(PPL)
LCD_TIMH (HFP)
LCD_TIMH (HBP)
horizontal back porch
(defined in pixel clocks)
horizontal front porch
(defined in pixel clocks)
LCDVD[23:0]
(panel data)
one horizontal line of LCD data
(1) The active data lines will vary with the type of TFT panel.
(2) The LCD panel clock is selected and scaled by the LCD controler and used to produce LCDCLK.
(3) The duration of the LCDLP is controlled by the HSW field in the LCD_TIMH register.
(4) The polarity of the LCDLP signal is determined by the IHS bit in the LCD_POL regster.
Fig 43. Horizontol timing for TFT displays
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Chapter 12: LPC24XX LCD controller
one frame
LCDDCLK
(panel clock)
panel data clock active
data enable
LCDENA
(data enable)
LCD_TIMV (VSW)
LCDFP
(vertical synch
pulse)
LCD_TIMV (VBP)
LCD_TIMV(LPP)
LCD_TIMV (VFP)
back porch
(defined in line clocks)
all horizontal lines for one frame
front porch
(defined in line clocks)
pixel data
and horizontal
control signals
for one frame
see horizontal timing for TFT displays
(1) Polarities may vary for some displays.
Fig 44. Vertical timing for TFT displays
9. LCD panel signal usage
Table 286. LCD panel connections for STN single panel mode
External pin
4-bit mono STN single panel
8-bit mono STN single panel
Color STN single panel
LPC2478 pin
used
LCD function LPC2478 pin
LCD function
LPC2478 pin
used
LCD function
used
LCDVD[23]
LCDVD[22]
LCDVD[21]
LCDVD[20]
LCDVD[19]
LCDVD[18]
LCDVD[17]
LCDVD[16]
LCDVD[15]
LCDVD[14]
LCDVD[13]
LCDVD[12]
LCDVD[11]
LCDVD[10]
LCDVD[9]
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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Chapter 12: LPC24XX LCD controller
Table 286. LCD panel connections for STN single panel mode
External pin
4-bit mono STN single panel
8-bit mono STN single panel
Color STN single panel
LPC2478 pin
used
LCD function LPC2478 pin
LCD function
LPC2478 pin
used
LCD function
used
LCDVD[8]
LCDVD[7]
LCDVD[6]
LCDVD[5]
LCDVD[4]
LCDVD[3]
LCDVD[2]
LCDVD[1]
LCDVD[0]
LCDLP
-
-
-
-
-
-
-
-
P4[29][3]
P4[28][3]
P2[13][2]
P2[12][2]
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P2[5][1]
P2[4][1]
UD[7]
UD[6]
UD[5]
UD[4]
UD[3]
UD[2]
UD[1]
UD[0]
LCDLP
P4[29][3]
P4[28][3]
P2[13][2]
P2[12][2]
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P2[5][1]
P2[4][1]
UD[7]
UD[6]
UD[5]
UD[4]
UD[3]
UD[2]
UD[1]
UD[0]
LCDLP
-
-
-
-
-
-
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P2[5][1]
P2[4][1]
UD[3]
UD[2]
UD[1]
UD[0]
LCDLP
LCDENAB/
LCDM
LCDENAB/
LCDM
LCDENAB/
LCDM
LCDENAB/
LCDM
LCDFP
P2[3][1]
P2[2][1]
P2[1][1]
P2[0][1]
P2[11][2]
LCDFP
P2[3][1]
P2[2][1]
P2[1][1]
P2[0][1]
P2[11][2]
LCDFP
P2[3][1]
P2[2][1]
P2[1][1]
P2[0][1]
P2[0][2]
LCDFP
LCDDCLK
LCDLE
LCDDCLK
LCDLE
LCDDCLK
LCDLE
LCDDCLK
LCDLE
LCDPWR
LCDCLKIN
CDPWR
LCDCLKIN
LCDPWR
LCDCLKIN
LCDPWR
LCDPWR
[1] ETM replaced with LCD pins.
[2] External interrupt pins EINT1, EINT2, EINT3 replaced with LCD pins.
[3] Timer pins MAT2[0] and MAT2[1] replaced with LCD pins.
Table 287. LCD panel connections for STN dual panel mode
External pin
4-bit mono STN dual panel
8-bit mono STN dual panel
Color STN dual panel
LPC2478 pin
used
LCD function LPC2478 pin
LCD function
LPC2478 pin
used
LCD function
used
LCDVD[23]
LCDVD[22]
LCDVD[21]
LCDVD[20]
LCDVD[19]
LCDVD[18]
LCDVD[17]
LCDVD[16]
LCDVD[15]
LCDVD[14]
LCDVD[13]
LCDVD[12]
LCDVD[11]
LCDVD[10]
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
P1[29][4]
P1[28][4]
P1[27][4]
P1[26][4]
P1[25][4]
P1[24][4]
LD[7]
LD[6]
LD[5]
LD[4]
LD[3]
LD[2]
P1[29][4]
P1[28][4]
P1[27][4]
P1[26][4]
P1[25][4]
P1[24][4]
LD[7]
LD[6]
LD[5]
LD[4]
LD[3]
LD[2]
-
-
-
P4[29][3]
P4[28][3]
LD[3]
LD[2]
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Chapter 12: LPC24XX LCD controller
Table 287. LCD panel connections for STN dual panel mode
External pin
4-bit mono STN dual panel
8-bit mono STN dual panel
Color STN dual panel
LPC2478 pin
used
LCD function LPC2478 pin LCD function
LPC2478 pin
used
LCD function
used
LCDVD[9]
LCDVD[8]
LCDVD[7]
LCDVD[6]
LCDVD[5]
LCDVD[4]
LCDVD[3]
LCDVD[2]
LCDVD[1]
LCDVD[0]
LCDLP
P2[13][2]
P2[12][2]
-
LD[1]
LD[0]
-
P1[23][4]
P1[22][4]
P1[21][4]
P1[20][4]
P2[13][2]
P2[12][2]
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P2[5][1]
P2[4][1]
LD[1]
LD[0]
UD[7]
UD[6]
UD[5]
UD[4]
UD[3]
UD[2]
UD[1]
UD[0]
LCDLP
P1[23][4]
P1[22][4]
P1[21][4]
P1[20][4]
P2[13][2]
P2[12][2]
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P2[5][1]
P2[4][1]
LD[1]
LD[0]
UD[7]
UD[6]
UD[5]
UD[4]
UD[3]
UD[2]
UD[1]
UD[0]
LCDLP
-
-
-
-
-
-
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P2[5][1]
P2[4][1]
UD[3]
UD[2]
UD[1]
UD[0]
LCDLP
LCDENAB/
LCDM
LCDENAB/
LCDM
LCDENAB/
LCDM
LCDENAB/
LCDM
LCDFP
P2[3][1]
P2[2][1]
P2[1][1]
P2[0][1]
P2[11][2]
LCDFP
P2[3][1]
P2[2][1]
P2[1][1]
P2[0][1]
P2[11][2]
LCDFP
P2[3][1]
P2[2][1]
P2[1][1]
P2[0][1]
P2[11][2]
LCDFP
LCDDCLK
LCDLE
LCDDCLK
LCDLE
LCDDCLK
LCDLE
LCDDCLK
LCDLE
LCDPWR
LCDCLKIN
LCDPWR
LCDCLKIN
LCDPWR
LCDCLKIN
LCDPWR
LCDCLKIN
[1] ETM replaced with LCD pins.
[2] External interrupt pins EINT1, EINT2, EINT3 replaced with LCD pins.
[3] Timer pins MAT2[0] and MAT2[1] replaced with LCD pins.
[4] USB OTG pins replaced by LCD pins.
Table 288. LCD panel connections for TFT panels
External
pin
TFT 12 bit (4:4:4 mode) TFT 16 bit (5:6:5 mode)
TFT 16 bit (1:5:5:5 mode) TFT 24 bit
LPC2478
pin used
LCD
function
LPC2478
pin used
LCD
function
LPC2478pin LCD
LPC2478
pin used
LCD
function
used
function
LCDVD[23] P1[29][4]
LCDVD[22] P1[28][4]
LCDVD[21] P1[27][4]
LCDVD[20] P1[26][4]
LCDVD[19] -
BLUE3
BLUE2
BLUE1
BLUE0
-
P1[29][4]
P1[28][4]
P1[27][4]
P1[26][4]
P2[13][2]
-
BLUE4
BLUE3
BLUE2
BLUE1
BLUE0
-
P1[29][4]
P1[28][4]
P1[27][4]
P1[26][4]
P2[13][2]
P2[12][2]
-
BLUE4
BLUE3
BLUE2
BLUE1
BLUE0
intensity
-
P1[29][4]
P1[28][4]
P1[27][4]
P1[26][4]
P2[13][2]
P2[12][2]
P0[9][5]
BLUE7
BLUE6
BLUE5
BLUE4
BLUE3
BLUE2
BLUE1
BLUE0
GREEN7
GREEN6
GREEN5
GREEN4
LCDVD[18] -
-
LCDVD[17] -
-
-
-
LCDVD[16] -
-
-
-
-
-
P0[8][5]
LCDVD[15] P1[25][4]
LCDVD[14] P1[24][4]
LCDVD[13] P1[23][4]
LCDVD[12] P1[22][4]
GREEN3
GREEN2
GREEN1
GREEN0
P1[25][4]
P1[24][4]
P1[23][4]
P1[22][4]
GREEN5
GREEN4
GREEN3
GREEN2
P1[25][4]
P1[24][4]
P1[23][4]
P1[22][4]
GREEN4
GREEN3
GREEN2
GREEN1
P1[25][4]
P1[24][4]
P1[23][4]
P1[22][4]
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Chapter 12: LPC24XX LCD controller
Table 288. LCD panel connections for TFT panels
External
pin
TFT 12 bit (4:4:4 mode) TFT 16 bit (5:6:5 mode)
TFT 16 bit (1:5:5:5 mode) TFT 24 bit
LPC2478
pin used
LCD
function
LPC2478
pin used
P1[21][4]
LCD
function
LPC2478pin LCD
LPC2478
pin used
LCD
function
used
P1[21][4]
P1[20][4]
-
function
LCDVD[11] -
LCDVD[10] -
-
GREEN1
GREEN0
intensity
-
P1[21][4]
P1[20][4]
P0[7][5]
P0[6][5]
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P4[29][3]
P4[28][3]
P0[5][5]
P0[4][5]
P2[5][1]
GREEN3
GREEN2
GREEN1
GREEN0
RED7
-
P1[20][4]
GREEN0
LCDVD[9]
-
-
-
-
LCDVD[8]
-
-
-
-
-
-
LCDVD[7] P2[9][1]
LCDVD[6] P2[8][1]
LCDVD[5] P2[7][1]
LCDVD[4] P2[6][1]
RED3
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P2[12][2]
-
RED4
RED3
RED2
RED1
RED0
-
P2[9][1]
P2[8][1]
P2[7][1]
P2[6][1]
P4[29][3]
P4[28][3]
-
RED4
RED3
RED2
RED1
RED0
intensity
-
RED2
RED6
RED1
RED5
RED0
RED4
LCDVD[3]
LCDVD[2]
LCDVD[1]
LCDVD[0]
LCDLP
-
-
RED3
-
-
RED2
-
-
-
-
RED1
-
-
-
-
-
-
RED0
P2[5][1]
LCDLP
P2[5][1]
LCDLP
P2[5][1]
LCDLP
LCDLP
LCDENAB/ P2[4][1]
LCDM
LCDENAB/ P2[4][1]
LCDM
LCDENAB/ P2[4][1]
LCDM
LCDENAB/ P2[4][1]
LCDM
LCDENAB/L
CDM
LCDFP
LCDDCLK P2[2][1]
LCDLE
P2[1][1]
LCDPWR P2[0][1]
LCDCLKIN P2[11][2]
P2[3][1]
LCDFP
LCDDCLK P2[2][1]
LCDLE
P2[1][1]
LCDPWR P2[0][1]
LCDCLKIN P2[11][2]
P2[3][1]
LCDFP
P2[3][1]
P2[2][1]
P2[1][1]
P2[0][1]
LCDFP
LCDDCLK P2[2][1]
LCDLE
P2[1][1]
LCDPWR P2[0][1]
LCDCLKIN P2[11][2]
P2[3][1]
LCDFP
LCDDCLK
LCDLE
LCDDCLK
LCDLE
LCDPWR
LCDCLKIN P2[11][2]
LCDPWR
LCDCLKIN
[1] ETM replaced with LCD pins.
[2] External interrupt pins EINT1, EINT2, EINT3 replaced with LCD pins.
[3] Timer pins MAT2[0] and MAT2[1] replaced with LCD pins.
[4] USB OTG pins replaced with LCD pins.
[5] I2S pins replaced with LCD pins.
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Chapter 13: LPC24XX USB device controller
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1. Basic configuration
The USB controller is configured using the following registers:
Remark: On reset, the USB block is disabled (PCUSB = 0).
3. Pins: Select USB pins and their modes in PINSEL0 to PINSEL5 and PINMODE0 to
port to wake up the microcontroller from Power-down mode.
2. Introduction
The Universal Serial Bus (USB) is a four-wire bus that supports communication between a
host and one or more (up to 127) peripherals. The host controller allocates the USB
bandwidth to attached devices through a token-based protocol. The bus supports hot
plugging and dynamic configuration of the devices. All transactions are initiated by the
host controller.
The host schedules transactions in 1 ms frames. Each frame contains a Start-Of-Frame
(SOF) marker and transactions that transfer data to or from device endpoints. Each device
can have a maximum of 16 logical or 32 physical endpoints. There are four types of
transfers defined for the endpoints. Control transfers are used to configure the device.
Interrupt transfers are used for periodic data transfer. Bulk transfers are used when the
rate of transfer is not critical. Isochronous transfers have guaranteed delivery time but no
error correction.
For more information on the Universal Serial Bus, see the USB Implementers Forum
website.
The USB device controller on the LPC2400 enables full-speed (12 Mb/s) data exchange
with a USB host controller.
Table 289. USB related acronyms, abbreviations, and definitions used in this chapter
Acronym/abbreviation Description
AHB
ATLE
ATX
DD
Advanced High-performance bus
Auto Transfer Length Extraction
Analog Transceiver
DMA Descriptor
DDP
DMA
DMA Description Pointer
Direct Memory Access
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Chapter 13: LPC24XX USB device controller
Table 289. USB related acronyms, abbreviations, and definitions used in this chapter
Acronym/abbreviation Description
EOP
EP
End-Of-Packet
Endpoint
EP_RAM
FS
Endpoint RAM
Full Speed
LED
LS
Light Emitting Diode
Low Speed
MPS
NAK
PLL
Maximum Packet Size
Negative Acknowledge
Phase Locked Loop
Random Access Memory
Start-Of-Frame
RAM
SOF
SIE
Serial Interface Engine
Synchronous RAM
USB Device Communication Area
Universal Serial Bus
SRAM
UDCA
USB
3. Features
• Fully compliant with the USB 2.0 specification (full speed).
• Supports 32 physical (16 logical) endpoints.
• Supports Control, Bulk, Interrupt and Isochronous endpoints.
• Scalable realization of endpoints at run time.
• Endpoint maximum packet size selection (up to USB maximum specification) by
software at run time.
• Supports SoftConnect and GoodLink features.
• Supports DMA transfers on all non-control endpoints.
• Allows dynamic switching between CPU controlled and DMA modes.
• Double buffer implementation for Bulk and Isochronous endpoints.
4. Fixed endpoint configuration
configured at run time using the Endpoint realization registers, documented in Section
Table 290. Fixed endpoint configuration
Logical
endpoint
Physical
endpoint
Endpoint type
Direction
Packet size (bytes)
Double buffer
0
0
1
1
0
1
2
3
Control
Control
Interrupt
Interrupt
Out
In
8, 16, 32, 64
8, 16, 32, 64
1 to 64
No
No
No
No
Out
In
1 to 64
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Chapter 13: LPC24XX USB device controller
Table 290. Fixed endpoint configuration
Logical
endpoint
Physical
endpoint
Endpoint type
Direction
Packet size (bytes)
Double buffer
2
4
Bulk
Out
In
8, 16, 32, 64
8, 16, 32, 64
1 to 1023
1 to 1023
1 to 64
Yes
Yes
Yes
Yes
No
2
5
Bulk
3
6
Isochronous
Isochronous
Interrupt
Interrupt
Bulk
Out
In
3
7
4
8
Out
In
4
9
1 to 64
No
5
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Out
In
8, 16, 32, 64
8, 16, 32, 64
1 to 1023
1 to 1023
1 to 64
Yes
Yes
Yes
Yes
No
5
Bulk
6
Isochronous
Isochronous
Interrupt
Interrupt
Bulk
Out
In
6
7
Out
In
7
1 to 64
No
8
Out
In
8, 16, 32, 64
8, 16, 32, 64
1 to 1023
1 to 1023
1 to 64
Yes
Yes
Yes
Yes
No
8
Bulk
9
Isochronous
Isochronous
Interrupt
Interrupt
Bulk
Out
In
9
10
10
11
11
12
12
13
13
14
14
15
15
Out
In
1 to 64
No
Out
In
8, 16, 32, 64
8, 16, 32, 64
1 to 1023
1 to 1023
1 to 64
Yes
Yes
Yes
Yes
No
Bulk
Isochronous
Isochronous
Interrupt
Interrupt
Bulk
Out
In
Out
In
1 to 64
No
Out
In
8, 16, 32, 64
8, 16, 32, 64
8, 16, 32, 64
8, 16, 32, 64
Yes
Yes
Yes
Yes
Bulk
Bulk
Out
In
Bulk
5. Functional description
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Chapter 13: LPC24XX USB device controller
VBUS
BUS
MASTER
INTERFACE
DMA
ENGINE
USB_CONNECT1,
USB_CONNECT2
DMA interface
(AHB master)
USB_D+1,
USB_D+2
EP_RAM
ACCESS
CONTROL
SERIAL
INTERFACE
ENGINE
REGISTER
INTERFACE
USB_D-1,
USB_D-2
USB_UP_LED1,
USB_UP_LED2
register
EP_RAM
(4K)
interface
(AHB slave)
USB DEVICE
BLOCK
Fig 45. USB device controller block diagram
5.1 Analog transceiver
The USB Device Controller has a built-in analog transceiver (ATX). The USB ATX
sends/receives the bi-directional D+ and D- signals of the USB bus.
5.2 Serial Interface Engine (SIE)
The SIE implements the full USB protocol layer. It is completely hardwired for speed and
needs no firmware intervention. It handles transfer of data between the endpoint buffers in
EP_RAM and the USB bus. The functions of this block include: synchronization pattern
recognition, parallel/serial conversion, bit stuffing/de-stuffing, CRC checking/generation,
PID verification/generation, address recognition, and handshake evaluation/generation.
5.3 Endpoint RAM (EP_RAM)
Each endpoint buffer is implemented as an SRAM based FIFO. The SRAM dedicated for
this purpose is called the EP_RAM. Each realized endpoint has a reserved space in the
EP_RAM. The total EP_RAM space required depends on the number of realized
endpoints, the maximum packet size of the endpoint, and whether the endpoint supports
double buffering.
5.4 EP_RAM access control
The EP_RAM Access Control logic handles transfer of data from/to the EP_RAM and the
three sources that can access it: the CPU (via the Register Interface), the SIE, and the
DMA Engine.
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Chapter 13: LPC24XX USB device controller
5.5 DMA engine and bus master interface
When enabled for an endpoint, the DMA Engine transfers data between RAM on the AHB
bus and the endpoint’s buffer in EP_RAM. A single DMA channel is shared between all
endpoints. When transferring data, the DMA Engine functions as a master on the AHB
bus through the bus master interface.
5.6 Register interface
The Register Interface allows the CPU to control the operation of the USB Device
Controller. It also provides a way to write transmit data to the controller and read receive
data from the controller.
5.7 SoftConnect
The connection to the USB is accomplished by bringing D+ (for a full-speed device) HIGH
through a 1.5 kOhm pull-up resistor. The SoftConnect feature can be used to allow
software to finish its initialization sequence before deciding to establish connection to the
USB. Re-initialization of the USB bus connection can also be performed without having to
unplug the cable.
To use the SoftConnect feature, the CONNECT signal should control an external switch
that connects the 1.5 kOhm resistor between D+ and +3.3V. Software can then control the
CONNECT signal by writing to the CON bit using the SIE Set Device Status command.
5.8 GoodLink
Good USB connection indication is provided through GoodLink technology. When the
device is successfully enumerated and configured, the LED indicator will be permanently
ON. During suspend, the LED will be OFF.
This feature provides a user-friendly indicator on the status of the USB device. It is a
useful field diagnostics tool to isolate faulty equipment.
To use the GoodLink feature the UP_LED signal should control an LED. The UP_LED
signal is controlled using the SIE Configure Device command.
6. Operational overview
Transactions on the USB bus transfer data between device endpoints and the host. The
direction of a transaction is defined with respect to the host. OUT transactions transfer
data from the host to the device. IN transactions transfer data from the device to the host.
All transactions are initiated by the host controller.
For an OUT transaction, the USB ATX receives the bi-directional D+ and D- signals of the
USB bus. The Serial Interface Engine (SIE) receives the serial data from the ATX and
converts it into a parallel data stream. The parallel data is written to the corresponding
endpoint buffer in the EP_RAM.
For IN transactions, the SIE reads the parallel data from the endpoint buffer in EP_RAM,
converts it into serial data, and transmits it onto the USB bus using the USB ATX.
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Once data has been received or sent, the endpoint buffer can be read or written. How this
is accomplished depends on the endpoint’s type and operating mode. The two operating
modes for each endpoint are Slave (CPU-controlled) mode, and DMA mode.
In Slave mode, the CPU transfers data between RAM and the endpoint buffer using the
this mode.
In DMA mode, the DMA transfers data between RAM and the endpoint buffer. See
Section 13–14 “DMA operation” for a detailed description of this mode.
7. Pin description
The device controller can access two USB ports indicated by suffixes 1 and 2 in the USB
pin names and referred to as USB port 1 (U1) and USB port 2 (U2) in the following text.
Table 291. USB device pin description
Name
Direction Description
VBUS
I
VBUS status input. When this function is not enabled
via its corresponding PINSEL register, it is driven
HIGH internally.
USB_CONNECT1,
USB_CONNECT2
O
O
SoftConnect control signal.
USB_UP_LED1,
USB_UP_LED2
GoodLink LED control signal.
USB_D+1, USB_D+2
I/O
I/O
Positive differential data.
Negative differential data.
USB_D−1, USB_D−2
7.1 USB device usage note
The USB device interface can be routed to either USB port1 (using USB_CONNECT1,
USB_UP_LED1, USB_D+1, USB_D−1) or USB port2 (using USB_CONNECT2,
USB_UP_LED2, USB_D+2, USB_D−2) to allow for more versatile pin multiplexing (see
To use both ports for USB transfer, port1 has to be configured as host and port2 has to be
configured as device. See Section 15–6.3 “Connecting USB as one port host and one port
device” on page 398 for details.
The USB device/host/OTG controller is disabled after RESET and must be enabled by
8. Clocking and power management
This section describes the clocking and power management features of the USB Device
Controller.
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Chapter 13: LPC24XX USB device controller
8.1 Power requirements
The USB protocol insists on power management by the device. This becomes very critical
if the device draws power from the bus (bus-powered device). The following constraints
should be met by a bus-powered device:
1. A device in the non-configured state should draw a maximum of 100 mA from the bus.
2. A configured device can draw only up to what is specified in the Max Power field of
the configuration descriptor. The maximum value is 500 mA.
3. A suspended device can draw a maximum of 500 μA.
8.2 Clocks
Table 292. USB device controller clock sources
Clock source
AHB master clock
AHB slave clock
usbclk
Description
Clock for the AHB master bus interface and DMA
Clock for the AHB slave interface
48 MHz clock from the USB clock divider, used to recover the
12 MHz clock from the USB bus
8.3 Power management support
To help conserve power, the USB device controller automatically disables the AHB master
clock and usbclk when not in use.
When the USB Device Controller goes into the suspend state (bus is idle for 3 ms), the
usbclk input to the device controller is automatically disabled, helping to conserve power.
However, if software wishes to access the device controller registers, usbclk must be
active. To allow access to the device controller registers while in the suspend state, the
USBClkCtrl and USBClkSt registers are provided.
When software wishes to access the device controller registers, it should first ensure
usbclk is enabled by setting DEV_CLK_EN in the USBClkCtrl register, and then poll the
corresponding DEV_CLK_ON bit in USBClkSt until set. Once set, usbclk will remain
enabled until DEV_CLK_EN is cleared by software.
When a DMA transfer occurs, the device controller automatically turns on the AHB master
clock. Once asserted, it remains active for a minimum of 2 ms (2 frames), to help ensure
that DMA throughput is not affected by turning off the AHB master clock. 2 ms after the
last DMA access, the AHB master clock is automatically disabled to help conserve power.
If desired, software also has the capability of forcing this clock to remain enabled using the
USBClkCtrl register.
Note that the AHB slave clock is always enabled as long as the PCUSB bit of PCONP is
set. When the device controller is not in use, all of the device controller clocks may be
disabled by clearing PCUSB.
The USB_NEED_CLK signal is used to facilitate going into and waking up from chip
Power-down mode. USB_NEED_CLK is asserted if any of the bits of the USBClkSt
register are asserted.
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After entering the suspend state with DEV_CLK_EN and AHB_CLK_EN cleared, the
DEV_CLK_ON and AHB_CLK_ON will be cleared when the corresponding clock turns off.
When both bits are zero, USB_NEED_CLK will be low, indicating that the chip can be put
into Power-down mode by writing to the PCON register. The status of USB_NEED_CLK
can be read from the USBIntSt register.
Any bus activity in the suspend state will cause the USB_NEED_CLK signal to be
asserted. When the USB is configured to be a wakeup source from power-down
(USBWAKE bit set in the INTWAKE register), the assertion of USB_NEED_CLK causes
the chip to wake up from Power-down mode.
8.4 Remote wake-up
The USB device controller supports software initiated remote wake-up. Remote wake-up
involves resume signaling on the USB bus initiated from the device. This is done by
clearing the SUS bit in the SIE Set Device Status register. Before writing into the register,
all the clocks to the device controller have to be enabled using the USBClkCtrl register.
9. Register description
The Serial Interface Engine (SIE) has other registers that are indirectly accessible via the
SIE command registers. See Section 13–11 “Serial interface engine command
description” for more info.
Table 293. Summary of USB device registers
Name
Description
Address
Port select register
USBPortSel[2]
Clock control registers
USBClkCtrl
USB Port Select
R/W
0x0000 0000
0xFFE0 C110
USB Clock Control
USB Clock Status
R/W
RO
0x0000 0000
0x0000 0000
0xFFE0 CFF4
0xFFE0 CFF8
USBClkSt
Device interrupt registers
USBIntSt
USB Interrupt Status
R/W
RO
0x8000 0000
0x0000 0010
0x0000 0000
0x0000 0000
0x0000 0000
0x00
0xE01F C1C0
0xFFE0 C200
0xFFE0 C204
0xFFE0 C208
0xFFE0 C20C
0xFFE0 C22C
USBDevIntSt
USBDevIntEn
USBDevIntClr
USBDevIntSet
USBDevIntPri
USB Device Interrupt Status
USB Device Interrupt Enable
USB Device Interrupt Clear
USB Device Interrupt Set
USB Device Interrupt Priority
R/W
WO
WO
WO
Endpoint interrupt registers
USBEpIntSt
USBEpIntEn
USBEpIntClr
USBEpIntSet
USBEpIntPri
USB Endpoint Interrupt Status
RO
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0xFFE0 C230
0xFFE0 C234
0xFFE0 C238
0xFFE0 C23C
0xFFE0 C240
USB Endpoint Interrupt Enable
USB Endpoint Interrupt Clear
USB Endpoint Interrupt Set
USB Endpoint Priority
R/W
WO
WO
WO[3]
Endpoint realization registers
USBReEp
USB Realize Endpoint
R/W
0x0000 0003
0xFFE0 C244
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Chapter 13: LPC24XX USB device controller
Table 293. Summary of USB device registers …continued
Name
Description
Access Reset value[1]
Address
USBEpInd
USB Endpoint Index
USB MaxPacketSize
WO[3]
0x0000 0000
0x0000 0008
0xFFE0 C248
0xFFE0 C24C
USBMaxPSize
USB transfer registers
USBRxData
R/W
USB Receive Data
RO
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0xFFE0 C218
0xFFE0 C220
0xFFE0 C21C
0xFFE0 C224
0xFFE0 C228
USBRxPLen
USB Receive Packet Length
USB Transmit Data
RO
USBTxData
WO[3]
WO[3]
R/W
USBTxPLen
USB Transmit Packet Length
USB Control
USBCtrl
SIE Command registers
USBCmdCode
USBCmdData
DMA registers
USBDMARSt
USBDMARClr
USBDMARSet
USBUDCAH
USB Command Code
USB Command Data
WO[3]
RO
0x0000 0000
0x0000 0000
0xFFE0 C210
0xFFE0 C214
USB DMA Request Status
RO
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0x0000 0000
0xFFE0 C250
0xFFE0 C254
0xFFE0 C258
0xFFE0 C280
0xFFE0 C284
0xFFE0 C288
0xFFE0 C28C
0xFFE0 C290
0xFFE0 C294
0xFFE0 C2A0
0xFFE0 C2A4
0xFFE0 C2A8
0xFFE0 C2AC
0xFFE0 C2B0
0xFFE0 C2B4
0xFFE0 C2B8
0xFFE0 C2BC
0xFFE0 C2C0
USB DMA Request Clear
WO[3]
WO[3]
R/W
RO
WO[3]
WO[3]
RO
USB DMA Request Set
USB UDCA Head
USBEpDMASt
USBEpDMAEn
USBEpDMADis
USBDMAIntSt
USBDMAIntEn
USBEoTIntSt
USBEoTIntClr
USBEoTIntSet
USBNDDRIntSt
USBNDDRIntClr
USBNDDRIntSet
USBSysErrIntSt
USBSysErrIntClr
USBSysErrIntSet
USB Endpoint DMA Status
USB Endpoint DMA Enable
USB Endpoint DMA Disable
USB DMA Interrupt Status
USB DMA Interrupt Enable
R/W
USB End of Transfer Interrupt Status
USB End of Transfer Interrupt Clear
USB End of Transfer Interrupt Set
USB New DD Request Interrupt Status
USB New DD Request Interrupt Clear
USB New DD Request Interrupt Set
USB System Error Interrupt Status
USB System Error Interrupt Clear
USB System Error Interrupt Set
RO
WO[3]
WO[3]
RO
WO[3]
WO[3]
RO
WO[3]
WO[3]
[1] Reset value reflects the data stored in used bits only. It does not include reserved bits content.
[2] The USBPortSel register is identical to the OTGStCtrl register (see Section 15–7.6). In device-only operations only bits 0 and 1 of this
register are used to control the routing of USB pins to port 1 or port 2.
[3] Reading WO register will return an invalid value.
9.1 Port select register
9.1.1 USB Port Select register (USBPortSel - 0xFFE0 C110)
This register selects the USB port pins the USB device signals are routed to. USBPortSel
is a read/write register.
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Chapter 13: LPC24XX USB device controller
Table 294. USB Port Select register (USBPortSel - address 0xFFE0 C110) bit description
Bit
Symbol
Value Description
Reset value
1:0
PORTSEL 0x0
The USB device controller signals are mapped to
the U1 port: USB_CONNECT1, USB_UP_LED1,
USB_D+1, USB_D−1.
0
0x3
The USB device controller signals are mapped to
the U2 port:USB_CONNECT2, USB_UP_LED2,
USB_D+2, USB_D−2
31:2
-
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
9.2 Clock control registers
9.2.1 USB Clock Control register (USBClkCtrl - 0xFFE0 CFF4)
This register controls the clocking of the USB Device Controller. Whenever software
wants to access the device controller registers, both DEV_CLK_EN and AHB_CLK_EN
must be set. The PORTSEL_CLK_EN bit need only be set when accessing the
USBPortSel register.
The software does not have to repeat this exercise for every register access, provided that
the corresponding USBClkCtrl bits are already set. Note that this register is functional only
when the PCUSB bit of PCONP is set; when PCUSB is cleared, all clocks to the device
controller are disabled irrespective of the contents of this register. USBClkCtrl is a
read/write register.
Table 295. USBClkCtrl register (USBClkCtrl - address 0xFFE0 CFF4) bit description
Bit
Symbol
Description
Reset
value
0
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
1
2
DEV_CLK_EN
-
Device clock enable. Enables the usbclk input to the
device controller
0
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
3
PORTSEL_CLK_EN
Port select register clock enable.
AHB clock enable
NA
0
4
AHB_CLK_EN
-
31:5
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
9.2.2 USB Clock Status register (USBClkSt - 0xFFE0 CFF8)
This register holds the clock availability status. The bits of this register are ORed together
to form the USB_NEED_CLK signal. When enabling a clock via USBClkCtrl, software
should poll the corresponding bit in USBClkSt. If it is set, then software can go ahead with
the register access. Software does not have to repeat this exercise for every access,
provided that the USBClkCtrl bits are not disturbed. USBClkSt is a read only register.
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Chapter 13: LPC24XX USB device controller
Table 296. USB Clock Status register (USBClkSt - 0xFFE0 CFF8) bit description
Bit
Symbol
Description
Reset
value
0
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
1
2
DEV_CLK_ON
-
Device clock on. The usbclk input to the device
controller is active.
0
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
3
PORTSEL_CLK_ON
Port select register clock on.
AHB clock on.
NA
0
4
AHB_CLK_ON
-
31:5
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
9.3 Device interrupt registers
9.3.1 USB Interrupt Status register (USBIntSt - 0xE01F C1C0)
The USB Device Controller has three interrupt lines. This register allows software to
determine their status with a single read operation. All three interrupt lines are ORed
together to a single channel of the vectored interrupt controller. This register also contains
the USB_NEED_CLK status and EN_USB_INTS control bits. USBIntSt is a read/write
register.
Table 297. USB Interrupt Status register (USBIntSt - address 0xE01F C1C0) bit description
Bit
Symbol
Description
Reset
value
0
USB_INT_REQ_LP
USB_INT_REQ_HP
USB_INT_REQ_DMA
-
Low priority interrupt line status. This bit is read only.
High priority interrupt line status. This bit is read only.
DMA interrupt line status. This bit is read only.
0
1
0
2
0
7:3
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
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Chapter 13: LPC24XX USB device controller
Table 297. USB Interrupt Status register (USBIntSt - address 0xE01F C1C0) bit description
Bit
Symbol
Description
Reset
value
8
USB_NEED_CLK
USB need clock indicator. This bit is set to 1 when USB activity or a
change of state on the USB data pins is detected, and it indicates that a
PLL supplied clock of 48 MHz is needed. Once USB_NEED_CLK
becomes one, it it resets to zero 5 ms after the last packet has been
received/sent, or 2 ms after the Suspend Change (SUS_CH) interrupt
has occurred. A change of this bit from 0 to 1 can wake up the
microcontroller if activity on the USB bus is selected to wake up the part
from the Power Down mode (see Section 4–3.4.7 “Interrupt Wakeup
considerations about the PLL and invoking the Power Down mode. This
bit is read only.
0
30:9
31
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
1
EN_USB_INTS
Enable all USB interrupts. When this bit is cleared, the Vectored
Interrupt Controller does not see the ORed output of the USB interrupt
lines.
9.3.2 USB Device Interrupt Status register (USBDevIntSt - 0xFFE0 C200)
The USBDevIntSt register holds the status of each interrupt. A 0 indicates no interrupt and
1 indicates the presence of the interrupt. USBDevIntSt is a read only register.
Table 298. USB Device Interrupt Status register (USBDevIntSt - address 0xFFE0 C200) bit allocation
Reset value: 0x0000 0000
Bit
31
30
-
29
28
-
27
-
26
-
25
-
24
-
Symbol
Bit
-
-
23
22
-
21
20
-
19
-
18
-
17
-
16
-
Symbol
Bit
-
-
15
14
-
13
12
-
11
-
10
-
9
8
Symbol
Bit
-
-
5
ERR_INT EP_RLZED
7
6
4
3
2
1
0
Symbol
TxENDPKT
Rx
CDFULL
CCEMPTY DEV_STAT EP_SLOW
EP_FAST
FRAME
ENDPKT
Table 299. USB Device Interrupt Status register (USBDevIntSt - address 0xFFE0 C200) bit description
Bit
0
Symbol
FRAME
EP_FAST
Description
Reset value
The frame interrupt occurs every 1 ms. This is used in isochronous packet transfers.
0
0
1
Fast endpoint interrupt. If an Endpoint Interrupt Priority register (USBEpIntPri) bit is
set, the corresponding endpoint interrupt will be routed to this bit.
2
3
EP_SLOW Slow endpoints interrupt. If an Endpoint Interrupt Priority Register (USBEpIntPri) bit is
not set, the corresponding endpoint interrupt will be routed to this bit.
0
0
DEV_STAT Set when USB Bus reset, USB suspend change or Connect change event occurs.
4
5
CCEMPTY The command code register (USBCmdCode) is empty (New command can be written). 1
CDFULL
Command data register (USBCmdData) is full (Data can be read now).
0
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Chapter 13: LPC24XX USB device controller
Table 299. USB Device Interrupt Status register (USBDevIntSt - address 0xFFE0 C200) bit description
Bit
6
Symbol
Description
Reset value
RxENDPKT The current packet in the endpoint buffer is transferred to the CPU.
0
0
7
TxENDPKT The number of data bytes transferred to the endpoint buffer equals the number of
bytes programmed in the TxPacket length register (USBTxPLen).
8
EP_RLZED Endpoints realized. Set when Realize Endpoint register (USBReEp) or MaxPacketSize
register (USBMaxPSize) is updated and the corresponding operation is completed.
0
0
9
ERR_INT
Error Interrupt. Any bus error interrupt from the USB device. Refer to Section 13–11.9
31:10
-
Reserved, user software should not write ones to reserved bits. The value read from a NA
reserved bit is not defined.
9.3.3 USB Device Interrupt Enable register (USBDevIntEn - 0xFFE0 C204)
Writing a one to a bit in this register enables the corresponding bit in USBDevIntSt to
generate an interrupt on one of the interrupt lines when set. By default, the interrupt is
routed to the USB_INT_REQ_LP interrupt line. Optionally, either the EP_FAST or FRAME
interrupt may be routed to the USB_INT_REQ_HP interrupt line by changing the value of
USBDevIntPri. USBDevIntEn is a read/write register.
Table 300. USB Device Interrupt Enable register (USBDevIntEn - address 0xFFE0 C204) bit allocation
Reset value: 0x0000 0000
Bit
31
30
-
29
28
-
27
-
26
-
25
-
24
-
Symbol
Bit
-
-
23
22
-
21
20
-
19
-
18
-
17
-
16
-
Symbol
Bit
-
-
15
14
-
13
12
-
11
-
10
-
9
8
Symbol
Bit
-
-
5
ERR_INT EP_RLZED
7
6
4
3
2
1
0
Symbol
TxENDPKT
Rx
CDFULL
CCEMPTY DEV_STAT EP_SLOW
EP_FAST
FRAME
ENDPKT
Table 301. USB Device Interrupt Enable register (USBDevIntEn - address 0xFFE0 C204) bit description
Bit
31:0 See
USBDevIntEn
Symbol
Value
Description
Reset value
0
1
No interrupt is generated.
0
An interrupt will be generated when the corresponding bit in the Device
the interrupt is routed to the USB_INT_REQ_LP interrupt line. Optionally,
either the EP_FAST or FRAME interrupt may be routed to the
bit allocation
table above
USB_INT_REQ_HP interrupt line by changing the value of USBDevIntPri.
9.3.4 USB Device Interrupt Clear register (USBDevIntClr - 0xFFE0 C208)
Writing one to a bit in this register clears the corresponding bit in USBDevIntSt. Writing a
zero has no effect.
Remark: Before clearing the EP_SLOW or EP_FAST interrupt bits, the corresponding
endpoint interrupts in USBEpIntSt should be cleared.
USBDevIntClr is a write only register.
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Chapter 13: LPC24XX USB device controller
Table 302. USB Device Interrupt Clear register (USBDevIntClr - address 0xFFE0 C208) bit allocation
Reset value: 0x0000 0000
Bit
31
30
-
29
28
-
27
-
26
-
25
-
24
-
Symbol
Bit
-
-
23
22
-
21
20
-
19
-
18
-
17
-
16
-
Symbol
Bit
-
-
15
14
-
13
12
-
11
-
10
-
9
8
Symbol
Bit
-
-
5
ERR_INT EP_RLZED
7
6
4
3
2
1
0
Symbol
TxENDPKT
Rx
CDFULL
CCEMPTY DEV_STAT EP_SLOW
EP_FAST
FRAME
ENDPKT
Table 303. USB Device Interrupt Clear register (USBDevIntClr - address 0xFFE0 C208) bit description
Bit
31:0 See
USBDevIntClr
Symbol
Value
Description
Reset value
0
1
No effect.
0
bit allocation
table above
9.3.5 USB Device Interrupt Set register (USBDevIntSet - 0xFFE0 C20C)
Writing one to a bit in this register sets the corresponding bit in the USBDevIntSt. Writing a
zero has no effect
USBDevIntSet is a write only register.
Table 304. USB Device Interrupt Set register (USBDevIntSet - address 0xFFE0 C20C) bit allocation
Reset value: 0x0000 0000
Bit
31
30
-
29
28
-
27
-
26
-
25
-
24
-
Symbol
Bit
-
-
23
22
-
21
20
-
19
-
18
-
17
-
16
-
Symbol
Bit
-
-
15
14
-
13
12
-
11
-
10
-
9
8
Symbol
Bit
-
-
5
ERR_INT EP_RLZED
7
6
4
3
2
1
0
Symbol
TxENDPKT
Rx
CDFULL
CCEMPTY DEV_STAT EP_SLOW
EP_FAST
FRAME
ENDPKT
Table 305. USB Device Interrupt Set register (USBDevIntSet - address 0xFFE0 C20C) bit description
Bit Symbol Value Description
31:0 See
USBDevIntSet
Reset value
0
1
No effect.
0
bit allocation
table above
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Chapter 13: LPC24XX USB device controller
9.3.6 USB Device Interrupt Priority register (USBDevIntPri - 0xFFE0 C22C)
Writing one to a bit in this register causes the corresponding interrupt to be routed to the
USB_INT_REQ_HP interrupt line. Writing zero causes the interrupt to be routed to the
USB_INT_REQ_LP interrupt line. Either the EP_FAST or FRAME interrupt can be routed
to USB_INT_REQ_HP, but not both. If the software attempts to set both bits to one, no
interrupt will be routed to USB_INT_REQ_HP. USBDevIntPri is a write only register.
Table 306. USB Device Interrupt Priority register (USBDevIntPri - address 0xFFE0 C22C) bit description
Bit
Symbol
Value Description
Reset value
0
FRAME
0
1
0
1
-
FRAME interrupt is routed to USB_INT_REQ_LP.
0
FRAME interrupt is routed to USB_INT_REQ_HP.
EP_FAST interrupt is routed to USB_INT_REQ_LP.
EP_FAST interrupt is routed to USB_INT_REQ_HP.
1
EP_FAST
-
0
7:2
Reserved, user software should not write ones to reserved bits. The value NA
read from a reserved bit is not defined.
9.4 Endpoint interrupt registers
The registers in this group facilitate handling of endpoint interrupts. Endpoint interrupts are
used in Slave mode operation.
9.4.1 USB Endpoint Interrupt Status register (USBEpIntSt - 0xFFE0 C230)
Each physical non-isochronous endpoint is represented by a bit in this register to indicate
that it has generated an interrupt. All non-isochronous OUT endpoints generate an
interrupt when they receive a packet without an error. All non-isochronous IN endpoints
generate an interrupt when a packet is successfully transmitted, or when a NAK
handshake is sent on the bus and the interrupt on NAK feature is enabled (see Section
13–11.3 “Set Mode (Command: 0xF3, Data: write 1 byte)” on page 364). A bit set to one in
this register causes either the EP_FAST or EP_SLOW bit of USBDevIntSt to be set
depending on the value of the coreesponding bit of USBEpDevIntPri. USBEpIntSt is a
read only register.
Note that for Isochronous endpoints, handling of packet data is done when the FRAME
interrupt occurs.
Table 307. USB Endpoint Interrupt Status register (USBEpIntSt - address 0xFFE0 C230) bit allocation
Reset value: 0x0000 0000
Bit
31
EP15TX
23
30
EP15RX
22
29
EP14TX
21
28
EP14RX
20
27
EP13TX
19
26
EP13RX
18
25
EP12TX
17
24
EP12RX
16
Symbol
Bit
Symbol
Bit
EP11TX
15
EP11RX
14
EP10TX
13
EP10RX
12
EP9TX
11
EP9RX
10
EP8TX
9
EP8RX
8
Symbol
Bit
EP7TX
7
EP7RX
6
EP6TX
5
EP6RX
4
EP5TX
3
EP5RX
2
EP4TX
1
EP4RX
0
Symbol
EP3TX
EP3RX
EP2TX
EP2RX
EP1TX
EP1RX
EP0TX
EP0RX
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Chapter 13: LPC24XX USB device controller
Table 308. USB Endpoint Interrupt Status register (USBEpIntSt - address 0xFFE0 C230) bit description
Bit
0
Symbol
EP0RX
EP0TX
EP1RX
EP1TX
Description
Reset value
Endpoint 0, Data Received Interrupt bit.
0
1
Endpoint 0, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 1, Data Received Interrupt bit.
0
2
0
3
Endpoint 1, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 2, Data Received Interrupt bit.
0
4
EP2RX
EP2TX
EP3RX
EP3TX
EP4RX
EP4TX
EP5RX
EP5TX
EP6RX
EP6TX
EP7RX
EP7TX
EP8RX
EP8TX
EP9RX
EP9TX
EP10RX
EP10TX
EP11RX
EP11TX
EP12RX
EP12TX
EP13RX
EP13TX
EP14RX
EP14TX
EP15RX
EP15TX
0
5
Endpoint 2, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 3, Isochronous endpoint.
0
6
NA
NA
0
7
Endpoint 3, Isochronous endpoint.
8
Endpoint 4, Data Received Interrupt bit.
9
Endpoint 4, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 5, Data Received Interrupt bit.
0
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0
Endpoint 5, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 6, Isochronous endpoint.
0
NA
NA
0
Endpoint 6, Isochronous endpoint.
Endpoint 7, Data Received Interrupt bit.
Endpoint 7, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 8, Data Received Interrupt bit.
0
0
Endpoint 8, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 9, Isochronous endpoint.
0
NA
NA
0
Endpoint 9, Isochronous endpoint.
Endpoint 10, Data Received Interrupt bit.
Endpoint 10, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 11, Data Received Interrupt bit.
Endpoint 11, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 12, Isochronous endpoint.
0
0
0
NA
NA
0
Endpoint 12, Isochronous endpoint.
Endpoint 13, Data Received Interrupt bit.
Endpoint 13, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 14, Data Received Interrupt bit.
Endpoint 14, Data Transmitted Interrupt bit or sent a NAK.
Endpoint 15, Data Received Interrupt bit.
Endpoint 15, Data Transmitted Interrupt bit or sent a NAK.
0
0
0
0
0
9.4.2 USB Endpoint Interrupt Enable register (USBEpIntEn - 0xFFE0 C234)
Setting a bit to 1 in this register causes the corresponding bit in USBEpIntSt to be set
when an interrupt occurs for the associated endpoint. Setting a bit to 0 causes the
corresponding bit in USBDMARSt to be set when an interrupt occurs for the associated
endpoint. USBEpIntEn is a read/write register.
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Chapter 13: LPC24XX USB device controller
Table 309. USB Endpoint Interrupt Enable register (USBEpIntEn - address 0xFFE0 C234) bit allocation
Reset value: 0x0000 0000
Bit
31
EP15TX
23
30
EP15RX
22
29
EP14TX
21
28
EP14RX
20
27
EP13TX
19
26
EP13RX
18
25
EP12TX
17
24
EP12RX
16
Symbol
Bit
Symbol
Bit
EP11TX
15
EP11RX
14
EP10TX
13
EP10RX
12
EP9TX
11
EP9RX
10
EP8TX
9
EP8RX
8
Symbol
Bit
EP7TX
7
EP7RX
6
EP6TX
5
EP6RX
4
EP5TX
3
EP5RX
2
EP4TX
1
EP4RX
0
Symbol
EP3TX
EP3RX
EP2TX
EP2RX
EP1TX
EP1RX
EP0TX
EP0RX
Table 310. USB Endpoint Interrupt Enable register (USBEpIntEn - address 0xFFE0 C234) bit description
Bit
31:0 See
USBEpIntEn
Symbol
Value Description
Reset value
0
The corresponding bit in USBDMARSt is set when an interrupt occurs for
0
this endpoint.
bit allocation
table above
1
The corresponding bit in USBEpIntSt is set when an interrupt occurs
for this endpoint. Implies Slave mode for this endpoint.
9.4.3 USB Endpoint Interrupt Clear register (USBEpIntClr - 0xFFE0 C238)
Writing a one to this a bit in this register causes the SIE Select Endpoint/Clear Interrupt
zero has no effect. Before executing the Select Endpoint/Clear Interrupt command, the
CDFULL bit in USBDevIntSt is cleared by hardware. On completion of the command, the
CDFULL bit is set, USBCmdData contains the status of the endpoint, and the
corresponding bit in USBEpIntSt is cleared.
Notes:
• When clearing interrupts using USBEpIntClr, software should wait for CDFULL to be
set to ensure the corresponding interrupt has been cleared before proceeding.
• While setting multiple bits in USBEpIntClr simultaneously is possible, it is not
recommended; only the status of the endpoint corresponding to the least significant
interrupt bit cleared will be available at the end of the operation.
• Alternatively, the SIE Select Endpoint/Clear Interrupt command can be directly
invoked using the SIE command registers, but using USBEpIntClr is recommended
because of its ease of use.
Each physical endpoint has its own reserved bit in this register. The bit field definition is
register.
Table 311. USB Endpoint Interrupt Clear register (USBEpIntClr - address 0xFFE0 C238) bit allocation
Reset value: 0x0000 0000
Bit
31
30
29
28
27
EP13TX
19
26
EP13RX
18
25
EP12TX
17
24
EP12RX
16
Symbol
Bit
EP15TX
23
EP15RX
22
EP14TX
21
EP14RX
20
Symbol
EP11TX
EP11RX
EP10TX
EP10RX
EP9TX
EP9RX
EP8TX
EP8RX
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Bit
15
EP7TX
7
14
EP7RX
6
13
EP6TX
5
12
EP6RX
4
11
EP5TX
3
10
EP5RX
2
9
8
Symbol
Bit
EP4TX
1
EP4RX
0
Symbol
EP3TX
EP3RX
EP2TX
EP2RX
EP1TX
EP1RX
EP0TX
EP0RX
Table 312. USB Endpoint Interrupt Clear register (USBEpIntClr - address 0xFFE0 C238) bit description
Bit Symbol Value Description
31:0 See
USBEpIntClr
Reset value
0
1
No effect.
0
Clears the corresponding bit in USBEpIntSt, by executing the SIE Select
Endpoint/Clear Interrupt command for this endpoint.
bit allocation
table above
9.4.4 USB Endpoint Interrupt Set register (USBEpIntSet - 0xFFE0 C23C)
Writing a one to a bit in this register sets the corresponding bit in USBEpIntSt. Writing zero
has no effect. Each endpoint has its own bit in this register. USBEpIntSet is a write only
register.
Table 313. USB Endpoint Interrupt Set register (USBEpIntSet - address 0xFFE0 C23C) bit allocation
Reset value: 0x0000 0000
Bit
31
EP15TX
23
30
EP15RX
22
29
EP14TX
21
28
EP14RX
20
27
EP13TX
19
26
EP13RX
18
25
EP12TX
17
24
EP12RX
16
Symbol
Bit
Symbol
Bit
EP11TX
15
EP11RX
14
EP10TX
13
EP10RX
12
EP9TX
11
EP9RX
10
EP8TX
9
EP8RX
8
Symbol
Bit
EP7TX
7
EP7RX
6
EP6TX
5
EP6RX
4
EP5TX
3
EP5RX
2
EP4TX
1
EP4RX
0
Symbol
EP3TX
EP3RX
EP2TX
EP2RX
EP1TX
EP1RX
EP0TX
EP0RX
Table 314. USB Endpoint Interrupt Set register (USBEpIntSet - address 0xFFE0 C23C) bit description
Bit Symbol Value Description
31:0 See
USBEpIntSet
Reset value
0
1
No effect.
0
Sets the corresponding bit in USBEpIntSt.
bit allocation
table above
9.4.5 USB Endpoint Interrupt Priority register (USBEpIntPri - 0xFFE0 C240)
This register determines whether an endpoint interrupt is routed to the EP_FAST or
EP_SLOW bits of USBDevIntSt. If a bit in this register is set to one, the interrupt is routed
to EP_FAST, if zero it is routed to EP_SLOW. Routing of multiple endpoints to EP_FAST
or EP_SLOW is possible.
Note that the USBDevIntPri register determines whether the EP_FAST interrupt is routed
to the USB_INT_REQ_HP or USB_INT_REQ_LP interrupt line.
USBEpIntPri is a write only register.
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Chapter 13: LPC24XX USB device controller
Table 315. USB Endpoint Interrupt Priority register (USBEpIntPri - address 0xFFE0 C240) bit allocation
Reset value: 0x0000 0000
Bit
31
EP15TX
23
30
EP15RX
22
29
EP14TX
21
28
E14RX
20
27
EP13TX
19
26
EP13RX
18
25
EP12TX
17
24
EP12RX
16
Symbol
Bit
Symbol
Bit
EP11TX
15
EP11RX
14
EP10TX
13
EP10RX
12
EP9TX
11
EP9RX
10
EP8TX
9
EP8RX
8
Symbol
Bit
EP7TX
7
EP7RX
6
EP6TX
5
EP6RX
4
EP5TX
3
EP5RX
2
EP4TX
1
EP4RX
0
Symbol
EP3TX
EP3RX
EP2TX
EP2RX
EP1TX
EP1RX
EP0TX
EP0RX
Table 316. USB Endpoint Interrupt Priority register (USBEpIntPri - address 0xFFE0 C240) bit description
Bit
31:0 See
USBEpIntPri
Symbol
Value Description
Reset value
0
1
The corresponding interrupt is routed to the EP_SLOW bit of USBDevIntSt
The corresponding interrupt is routed to the EP_FAST bit of USBDevIntSt
0
bit allocation
table above
9.5 Endpoint realization registers
The registers in this group allow realization and configuration of endpoints at run time.
9.5.1 EP RAM requirements
The USB device controller uses a RAM based FIFO for each endpoint buffer. The RAM
dedicated for this purpose is called the Endpoint RAM (EP_RAM). Each endpoint has
space reserved in the EP_RAM. The EP_RAM space required for an endpoint depends
on its MaxPacketSize and whether it is double buffered. 32 words of EP_RAM are used by
the device for storing the endpoint buffer pointers. The EP_RAM is word aligned but the
MaxPacketSize is defined in bytes hence the RAM depth has to be adjusted to the next
word boundary. Also, each buffer has one word header showing the size of the packet
length received.
The EP_ RAM space (in words) required for the physical endpoint can be expressed as
MaxPacketSize + 3
⎛
⎝
⎞
EPRAMspace =
+ 1 × dbstatus
-------------------------------------------------
⎠
4
where dbstatus = 1 for a single buffered endpoint and 2 for double a buffered endpoint.
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Since all the realized endpoints occupy EP_RAM space, the total EP_RAM requirement is
N
TotalEPRAMspace = 32 +
EPRAMspace(n)
∑
n = 0
where N is the number of realized endpoints. Total EP_RAM space should not exceed
4096 bytes (4 kB, 1 kwords).
9.5.2 USB Realize Endpoint register (USBReEp - 0xFFE0 C244)
Writing one to a bit in this register causes the corresponding endpoint to be realized.
Writing zeros causes it to be unrealized. This register returns to its reset state when a bus
reset occurs. USBReEp is a read/write register.
Table 317. USB Realize Endpoint register (USBReEp - address 0xFFE0 C244) bit allocation
Reset value: 0x0000 0003
Bit
31
EP31
23
30
EP30
22
29
EP29
21
28
EP28
20
27
EP27
19
26
EP26
18
25
EP25
17
24
EP24
16
Symbol
Bit
Symbol
Bit
EP23
15
EP22
14
EP21
13
EP20
12
EP19
11
EP18
10
EP17
9
EP16
8
Symbol
Bit
EP15
7
EP14
6
EP13
5
EP12
4
EP11
3
EP10
2
EP9
1
EP8
0
Symbol
EP7
EP6
EP5
EP4
EP3
EP2
EP1
EP0
Table 318. USB Realize Endpoint register (USBReEp - address 0xFFE0 C244) bit description
Bit
Symbol
Value Description
Reset value
0
EP0
0
1
0
1
0
1
Control endpoint EP0 is not realized.
1
Control endpoint EP0 is realized.
Control endpoint EP1 is not realized.
Control endpoint EP1 is realized.
Endpoint EPxx is not realized.
Endpoint EPxx is realized.
1
EP1
1
0
31:2 EPxx
On reset, only the control endpoints are realized. Other endpoints, if required, are realized
by programming the corresponding bits in USBReEp. To calculate the required EP_RAM
Realization of endpoints is a multi-cycle operation. Pseudo code for endpoint realization is
shown below.
Clear EP_RLZED bit in USBDevIntSt;
for every endpoint to be realized,
{
/* OR with the existing value of the Realize Endpoint register */
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USBReEp |= (UInt32) ((0x1 << endpt));
/* Load Endpoint index Reg with physical endpoint no.*/
USBEpIn = (UInt32) endpointnumber;
/* load the max packet size Register */
USBEpMaxPSize = MPS;
/* check whether the EP_RLZED bit in the Device Interrupt Status register is set
*/
while (!(USBDevIntSt & EP_RLZED))
{
/* wait until endpoint realization is complete */
}
/* Clear the EP_RLZED bit */
Clear EP_RLZED bit in USBDevIntSt;
}
The device will not respond to any transactions to unrealized endpoints. The SIE
Configure Device command will only cause realized and enabled endpoints to respond to
9.5.3 USB Endpoint Index register (USBEpIn - 0xFFE0 C248)
Each endpoint has a register carrying the MaxPacketSize value for that endpoint. This is
in fact a register array. Hence before writing, this register is addressed through the
USBEpIn register.
The USBEpIn register will hold the physical endpoint number. Writing to USBMaxPSize
will set the array element pointed to by USBEpIn. USBEpIn is a write only register.
Table 319. USB Endpoint Index register (USBEpIn - address 0xFFE0 C248) bit description
Bit
Symbol
PHY_EP
-
Description
Reset value
4:0
Physical endpoint number (0-31)
0
31:5
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
9.5.4 USB MaxPacketSize register (USBMaxPSize - 0xFFE0 C24C)
On reset, the control endpoint is assigned the maximum packet size of 8 bytes. Other
endpoints are assigned 0. Modifying USBMaxPSize will cause the endpoint buffer
addresses within the EP_RAM to be recalculated. This is a multi-cycle process. At the
Table 320. USB MaxPacketSize register (USBMaxPSize - address 0xFFE0 C24C) bit
description
Bit
Symbol
Description
Reset value
9:0
MPS
-
The maximum packet size value.
0x008[1]
31:10
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
[1] Reset value for EP0 and EP1. All other endpoints have a reset value of 0x0.
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MPS_EP0
ENDPOINT INDEX
MPS_EP31
The Endpoint Index is set via the USBEpIn register. MPS_EP0 to MPS_EP31 are accessed via the
USBMaxPSize register.
Fig 46. USB MaxPacketSize register array indexing
9.6 USB transfer registers
The registers in this group are used for transferring data between endpoint buffers and
9.6.1 USB Receive Data register (USBRxData - 0xFFE0 C218)
For an OUT transaction, the CPU reads the endpoint buffer data from this register. Before
reading this register, the RD_EN bit and LOG_ENDPOINT field of the USBCtrl register
should be set appropriately. On reading this register, data from the selected endpoint
buffer is fetched. The data is in little endian format: the first byte received from the USB
bus will be available in the least significant byte of USBRxData. USBRxData is a read only
register.
Table 321. USB Receive Data register (USBRxData - address 0xFFE0 C218) bit description
Bit
Symbol
Description
Reset value
31:0
RX_DATA
Data received.
0x0000 0000
9.6.2 USB Receive Packet Length register (USBRxPLen - 0xFFE0 C220)
This register contains the number of bytes remaining in the endpoint buffer for the current
packet being read via the USBRxData register, and a bit indicating whether the packet is
valid or not. Before reading this register, the RD_EN bit and LOG_ENDPOINT field of the
USBCtrl register should be set appropriately. This register is updated on each read of the
USBRxData register. USBRxPLen is a read only register.
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Table 322. USB Receive Packet Length register (USBRxPlen - address 0xFFE0 C220) bit
description
Bit
Symbol
Value Description
Reset
value
9:0
PKT_LNGTH
-
The remaining number of bytes to be read from the
0
currently selected endpoint’s buffer. When this field
decrements to 0, the RxENDPKT bit will be set in
USBDevIntSt.
10
DV
Data valid. This bit is useful for isochronous endpoints.
Non-isochronous endpoints do not raise an interrupt when
an erroneous data packet is received. But invalid data
packet can be produced with a bus reset. For isochronous
endpoints, data transfer will happen even if an erroneous
packet is received. In this case DV bit will not be set for the
packet.
0
0
1
-
Data is invalid.
Data is valid.
11
PKT_RDY
The PKT_LNGTH field is valid and the packet is ready for
reading.
0
31:12 -
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
9.6.3 USB Transmit Data register (USBTxData - 0xFFE0 C21C)
For an IN transaction, the CPU writes the endpoint data into this register. Before writing to
this register, the WR_EN bit and LOG_ENDPOINT field of the USBCtrl register should be
set appropriately, and the packet length should be written to the USBTxPlen register. On
writing this register, the data is written to the selected endpoint buffer. The data is in little
endian format: the first byte sent on the USB bus will be the least significant byte of
USBTxData. USBTxData is a write only register.
Table 323. USB Transmit Data register (USBTxData - address 0xFFE0 C21C) bit description
Bit
Symbol
Description
Reset value
31:0
TX_DATA
Transmit Data.
0x0000 0000
9.6.4 USB Transmit Packet Length register (USBTxPLen - 0xFFE0 C224)
This register contains the number of bytes transferred from the CPU to the selected
endpoint buffer. Before writing data to USBTxData, software should first write the packet
length (≤ MaxPacketSize) to this register. After each write to USBTxData, hardware
decrements USBTxPLen by 4. The WR_EN bit and LOG_ENDPOINT field of the USBCtrl
register should be set to select the desired endpoint buffer before starting this process.
For data buffers larger than the endpoint’s MaxPacketSize, software should submit data in
packets of MaxPacketSize, and send the remaining extra bytes in the last packet. For
example, if the MaxPacketSize is 64 bytes and the data buffer to be transferred is of
length 130 bytes, then the software sends two 64-byte packets and the remaining 2 bytes
in the last packet. So, a total of 3 packets are sent on USB. USBTxPLen is a write only
register.
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Table 324. USB Transmit Packet Length register (USBTxPLen - address 0xFFE0 C224) bit
description
Bit
Symbol
Value Description
Reset
value
9:0
PKT_LNGTH
-
The remaining number of bytes to be written to the
0x000
selected endpoint buffer. This field is decremented by 4 by
hardware after each write to USBTxData. When this field
decrements to 0, the TxENDPKT bit will be set in
USBDevIntSt.
31:10
-
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
9.6.5 USB Control register (USBCtrl - 0xFFE0 C228)
This register controls the data transfer operation of the USB device. It selects the endpoint
buffer that is accessed by the USBRxData and USBTxData registers, and enables
reading and writing them. USBCtrl is a read/write register.
Table 325. USB Control register (USBCtrl - address 0xFFE0 C228) bit description
Bit Symbol
Value Description
Reset
value
0
RD_EN
Read mode control. Enables reading data from the OUT
0
endpoint buffer for the endpoint specified in the
LOG_ENDPOINT field using the USBRxData register.
This bit is cleared by hardware when the last word of
the current packet is read from USBRxData.
0
1
Read mode is disabled.
Read mode is enabled.
1
WR_EN
Write mode control. Enables writing data to the IN
endpoint buffer for the endpoint specified in the
LOG_ENDPOINT field using the USBTxData register.
This bit is cleared by hardware when the number of
bytes in USBTxLen have been sent.
0
0
1
Write mode is disabled.
Write mode is enabled.
Logical Endpoint number.
5:2 LOG_ENDPOINT -
31:6 -
0x0
NA
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
9.7 SIE command code registers
The SIE command code registers are used for communicating with the Serial Interface
information.
9.7.1 USB Command Code register (USBCmdCode - 0xFFE0 C210)
This register is used for sending the command and write data to the SIE. The commands
written here are propagated to the SIE and executed there. After executing the command,
the register is empty, and the CCEMPTY bit of USBDevIntSt register is set. See
Section 13–11 for details. USBCmdCode is a write only register.
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Table 326. USB Command Code register (USBCmdCode - address 0xFFE0 C210) bit description
Bit
Symbol
Value
Description
Reset value
7:0
-
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
15:8
CMD_PHASE
The command phase:
0x00
0x01
0x02
0x05
Read
Write
Command
23:16 CMD_CODE/
CMD_WDATA
This is a multi-purpose field. When CMD_PHASE is
Command or Read, this field contains the code for the
command (CMD_CODE). When CMD_PHASE is Write,
this field contains the command write data (CMD_WDATA).
0x00
31:24
-
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
9.7.2 USB Command Data register (USBCmdData - 0xFFE0 C214)
This register contains the data retrieved after executing a SIE command. When the data is
for details. USBCmdData is a read only register.
Table 327. USB Command Data register (USBCmdData - address 0xFFE0 C214) bit
description
Bit
Symbol
Description
Reset value
7:0
CMD_RDATA
-
Command Read Data.
0x00
31:8
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
9.8 DMA registers
The registers in this group are used for the DMA mode of operation (see Section 13–14
9.8.1 USB DMA Request Status register (USBDMARSt - 0xFFE0 C250)
A bit in this register associated with a non-isochronous endpoint is set by hardware when
an endpoint interrupt occurs (see the description of USBEpIntSt) and the corresponding
bit in USBEpIntEn is 0. A bit associated with an isochronous endpoint is set when the
corresponding bit in USBEpIntEn is 0 and a FRAME interrupt occurs. A set bit serves as
a flag for the DMA engine to start the data transfer if the DMA is enabled for the
corresponding endpoint in the USBEpDMASt register. The DMA cannot be enabled for
control endpoints (EP0 and EP1). USBDMARSt is a read only register.
Table 328. USB DMA Request Status register (USBDMARSt - address 0xFFE0 C250) bit allocation
Reset value: 0x0000 0000
Bit
31
EP31
23
30
EP30
22
29
EP29
21
28
EP28
20
27
EP27
19
26
EP26
18
25
EP25
17
24
EP24
16
Symbol
Bit
Symbol
EP23
EP22
EP21
EP20
EP19
EP18
EP17
EP16
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Bit
15
EP15
7
14
EP14
6
13
EP13
5
12
EP12
4
11
EP11
3
10
EP10
2
9
8
Symbol
Bit
EP9
1
EP8
0
Symbol
EP7
EP6
EP5
EP4
EP3
EP2
EP1
EP0
Table 329. USB DMA Request Status register (USBDMARSt - address 0xFFE0 C250) bit description
Bit
Symbol
Value Description
Reset value
0
EP0
0
Control endpoint OUT (DMA cannot be enabled for this endpoint and EP0
0
bit must be 0).
1
EP1
0
Control endpoint IN (DMA cannot be enabled for this endpoint and EP1 bit
must be 0).
0
0
31:2 EPxx
Endpoint xx (2 ≤ xx ≤ 31) DMA request.
DMA not requested by endpoint xx.
DMA requested by endpoint xx.
0
1
[1] DMA can not be enabled for this endpoint and the corresponding bit in the USBDMARSt must be 0.
9.8.2 USB DMA Request Clear register (USBDMARClr - 0xFFE0 C254)
Writing one to a bit in this register will clear the corresponding bit in the USBDMARSt
register. Writing zero has no effect.
This register is intended for initialization prior to enabling the DMA for an endpoint. When
the DMA is enabled for an endpoint, hardware clears the corresponding bit in
USBDMARSt on completion of a packet transfer. Therefore, software should not clear the
bit using this register while the endpoint is enabled for DMA operation.
USBDMARClr is a write only register.
Table 330. USB DMA Request Clear register (USBDMARClr - address 0xFFE0 C254) bit description
Bit
Symbol
Value Description
Reset value
0
EP0
0
Control endpoint OUT (DMA cannot be enabled for this endpoint and the
0
EP0 bit must be 0).
1
EP1
0
Control endpoint IN (DMA cannot be enabled for this endpoint and the EP1
bit must be 0).
0
0
31:2 EPxx
Clear the endpoint xx (2 ≤ xx ≤ 31) DMA request.
No effect.
0
1
Clear the corresponding bit in USBDMARSt.
9.8.3 USB DMA Request Set register (USBDMARSet - 0xFFE0 C258)
Writing one to a bit in this register sets the corresponding bit in the USBDMARSt register.
Writing zero has no effect.
This register allows software to raise a DMA request. This can be useful when switching
from Slave to DMA mode of operation for an endpoint: if a packet to be processed in DMA
mode arrives before the corresponding bit of USBEpIntEn is cleared, the DMA request is
not raised by hardware. Software can then use this register to manually start the DMA
transfer.
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Software can also use this register to initiate a DMA transfer to proactively fill an IN
endpoint buffer before an IN token packet is received from the host.
USBDMARSet is a write only register.
Table 331. USB DMA Request Set register (USBDMARSet - address 0xFFE0 C258) bit
description
Bit Symbol Value Description
Reset
value
0
1
EP0
EP1
0
0
Control endpoint OUT (DMA cannot be enabled for this endpoint
and the EP0 bit must be 0).
0
0
0
Control endpoint IN (DMA cannot be enabled for this endpoint and
the EP1 bit must be 0).
31:2 EPxx
Set the endpoint xx (2 ≤ xx ≤ 31) DMA request.
No effect.
0
1
Set the corresponding bit in USBDMARSt.
9.8.4 USB UDCA Head register (USBUDCAH - 0xFFE0 C280)
The UDCA (USB Device Communication Area) Head register maintains the address
where the UDCA is located in the USB RAM. Refer to Section 13–14.2 “USB device
UDCA and DMA descriptors. USBUDCAH is a read/write register.
Table 332. USB UDCA Head register (USBUDCAH - address 0xFFE0 C280) bit description
Bit
Symbol
Description
Reset value
6:0
-
Reserved. Software should not write ones to reserved bits. The UDCA is 0x00
aligned to 128-byte boundaries.
31:7
UDCA_ADDR
Start address of the UDCA.
0
9.8.5 USB EP DMA Status register (USBEpDMASt - 0xFFE0 C284)
Bits in this register indicate whether DMA operation is enabled for the corresponding
endpoint. A DMA transfer for an endpoint can start only if the corresponding bit is set in
this register. USBEpDMASt is a read only register.
Table 333. USB EP DMA Status register (USBEpDMASt - address 0xFFE0 C284) bit
description
Bit Symbol
Value Description
Reset
value
0
1
EP0_DMA_ENABLE
0
0
Control endpoint OUT (DMA cannot be enabled for
this endpoint and the EP0_DMA_ENABLE bit must
be 0).
0
0
0
EP1_DMA_ENABLE
Control endpoint IN (DMA cannot be enabled for this
endpoint and the EP1_DMA_ENABLE bit must be
0).
31:2 EPxx_DMA_ENABLE
endpoint xx (2 ≤ xx ≤ 31) DMA enabled bit.
The DMA for endpoint EPxx is disabled.
The DMA for endpoint EPxx is enabled.
0
1
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9.8.6 USB EP DMA Enable register (USBEpDMAEn - 0xFFE0 C288)
Writing one to a bit to this register will enable the DMA operation for the corresponding
endpoint. Writing zero has no effect.The DMA cannot be enabled for control endpoints
EP0 and EP1. USBEpDMAEn is a write only register.
Table 334. USB EP DMA Enable register (USBEpDMAEn - address 0xFFE0 C288) bit
description
Bit Symbol
Value Description
Reset
value
0
1
EP0_DMA_ENABLE
0
0
Control endpoint OUT (DMA cannot be enabled for
this endpoint and the EP0_DMA_ENABLE bit value
must be 0).
0
EP1_DMA_ENABLE
Control endpoint IN (DMA cannot be enabled for this
endpoint and the EP1_DMA_ENABLE bit must be 0).
0
0
31:2 EPxx_DMA_ENABLE
Endpoint xx(2 ≤ xx ≤ 31) DMA enable control bit.
No effect.
0
1
Enable the DMA operation for endpoint EPxx.
9.8.7 USB EP DMA Disable register (USBEpDMADis - 0xFFE0 C28C)
Writing a one to a bit in this register clears the corresponding bit in USBEpDMASt. Writing
zero has no effect on the corresponding bit of USBEpDMASt. Any write to this register
clears the internal DMA_PROCEED flag. Refer to Section 13–14.5.4 “Optimizing
descriptor fetch” for more information on the DMA_PROCEED flag. If a DMA transfer is in
progress for an endpoint when its corresponding bit is cleared, the transfer is completed
before the DMA is disabled. When an error condition is detected during a DMA transfer,
the corresponding bit is cleared by hardware. USBEpDMADis is a write only register.
Table 335. USB EP DMA Disable register (USBEpDMADis - address 0xFFE0 C28C) bit
description
Bit Symbol
Value Description
Reset
value
0
1
EP0_DMA_DISABLE
0
0
Control endpoint OUT (DMA cannot be enabled for
this endpoint and the EP0_DMA_DISABLE bit value
must be 0).
0
0
0
EP1_DMA_DISABLE
Control endpoint IN (DMA cannot be enabled for
this endpoint and the EP1_DMA_DISABLE bit value
must be 0).
31:2 EPxx_DMA_DISABLE
Endpoint xx (2 ≤ xx ≤ 31) DMA disable control bit.
No effect.
0
1
Disable the DMA operation for endpoint EPxx.
9.8.8 USB DMA Interrupt Status register (USBDMAIntSt - 0xFFE0 C290)
Each bit of this register reflects whether any of the 32 bits in the corresponding interrupt
status register are set. USBDMAIntSt is a read only register.
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Table 336. USB DMA Interrupt Status register (USBDMAIntSt - address 0xFFE0 C290) bit
description
Bit Symbol
Value Description
Reset
value
0
1
2
EOT
End of Transfer Interrupt bit.
0
0
1
All bits in the USBEoTIntSt register are 0.
At least one bit in the USBEoTIntSt is set.
New DD Request Interrupt bit.
NDDR
ERR
0
0
1
All bits in the USBNDDRIntSt register are 0.
At least one bit in the USBNDDRIntSt is set.
System Error Interrupt bit.
0
0
1
-
All bits in the USBSysErrIntSt register are 0.
At least one bit in the USBSysErrIntSt is set.
31:3 -
Reserved, user software should not write
ones to reserved bits. The value read from a
reserved bit is not defined.
NA
9.8.9 USB DMA Interrupt Enable register (USBDMAIntEn - 0xFFE0 C294)
Writing a one to a bit in this register enables the corresponding bit in USBDMAIntSt to
generate an interrupt on the USB_INT_REQ_DMA interrupt line when set. USBDMAIntEn
is a read/write register.
Table 337. USB DMA Interrupt Enable register (USBDMAIntEn - address 0xFFE0 C294) bit
description
Bit Symbol
Value Description
Reset
value
0
1
EOT
End of Transfer Interrupt enable bit.
0
0
0
1
The End of Transfer Interrupt is disabled.
The End of Transfer Interrupt is enabled.
New DD Request Interrupt enable bit.
NDDR
0
1
The New DD Request Interrupt is
disabled.
The New DD Request Interrupt is
enabled.
2
ERR
System Error Interrupt enable bit.
0
0
1
-
The System Error Interrupt is disabled.
The System Error Interrupt is enabled.
31:3 -
Reserved, user software should not write NA
ones to reserved bits. The value read
from a reserved bit is not defined.
9.8.10 USB End of Transfer Interrupt Status register (USBEoTIntSt - 0xFFE0 C2A0)
When the DMA transfer completes for the current DMA descriptor, either normally
(descriptor is retired) or because of an error, the bit corresponding to the endpoint is set in
this register. The cause of the interrupt is recorded in the DD_status field of the descriptor.
USBEoTIntSt is a read only register.
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Table 338. USB End of Transfer Interrupt Status register (USBEoTIntSt - address
0xFFE0 C2A0s) bit description
Bit
Symbol
Value Description
Reset
value
31:0 EPxx
Endpoint xx (2 ≤ xx ≤ 31) End of Transfer Interrupt request.
0
0
1
There is no End of Transfer interrupt request for endpoint xx.
There is an End of Transfer Interrupt request for endpoint xx.
9.8.11 USB End of Transfer Interrupt Clear register (USBEoTIntClr - 0xFFE0 C2A4)
Writing one to a bit in this register clears the corresponding bit in the USBEoTIntSt
register. Writing zero has no effect. USBEoTIntClr is a write only register.
Table 339. USB End of Transfer Interrupt Clear register (USBEoTIntClr - address
0xFFE0 C2A4) bit description
Bit Symbol Value Description
Reset
value
31:0 EPxx
Clear endpoint xx (2 ≤ xx ≤ 31) End of Transfer Interrupt request. 0
0
1
No effect.
Clear the EPxx End of Transfer Interrupt request in the
USBEoTIntSt register.
9.8.12 USB End of Transfer Interrupt Set register (USBEoTIntSet - 0xFFE0 C2A8)
Writing one to a bit in this register sets the corresponding bit in the USBEoTIntSt register.
Writing zero has no effect. USBEoTIntSet is a write only register.
Table 340. USB End of Transfer Interrupt Set register (USBEoTIntSet - address
0xFFE0 C2A8) bit description
Bit
Symbol Value Description
Reset
value
31:0 EPxx
Set endpoint xx (2 ≤ xx ≤ 31) End of Transfer Interrupt request.
0
0
1
No effect.
Set the EPxx End of Transfer Interrupt request in the
USBEoTIntSt register.
9.8.13 USB New DD Request Interrupt Status register (USBNDDRIntSt - 0xFFE0
C2AC)
A bit in this register is set when a transfer is requested from the USB device and no valid
DD is detected for the corresponding endpoint. USBNDDRIntSt is a read only register.
Table 341. USB New DD Request Interrupt Status register (USBNDDRIntSt - address
0xFFE0 C2AC) bit description
Bit
Symbol
Value Description
Endpoint xx (2 ≤ xx ≤ 31) new DD interrupt request.
Reset value
31:0 EPxx
0
0
1
There is no new DD interrupt request for endpoint xx.
There is a new DD interrupt request for endpoint xx.
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Chapter 13: LPC24XX USB device controller
9.8.14 USB New DD Request Interrupt Clear register (USBNDDRIntClr - 0xFFE0
C2B0)
Writing one to a bit in this register clears the corresponding bit in the USBNDDRIntSt
register. Writing zero has no effect. USBNDDRIntClr is a write only register.
Table 342. USB New DD Request Interrupt Clear register (USBNDDRIntClr - address 0xFFE0
C2B0) bit description
Bit Symbol Value Description
Reset value
31:0 EPxx Clear endpoint xx (2 ≤ xx ≤ 31) new DD interrupt request. 0
0
1
No effect.
Clear the EPxx new DD interrupt request in the
USBNDDRIntSt register.
9.8.15 USB New DD Request Interrupt Set register (USBNDDRIntSet - 0xFFE0
C2B4)
Writing one to a bit in this register sets the corresponding bit in the USBNDDRIntSt
register. Writing zero has no effect. USBNDDRIntSet is a write only register
Table 343. USB New DD Request Interrupt Set register (USBNDDRIntSet - address 0xFFE0
C2B4) bit description
Bit
Symbol
Value Description
Set endpoint xx (2 ≤ xx ≤ 31) new DD interrupt request.
No effect.
Reset value
31:0 EPxx
0
0
1
Set the EPxx new DD interrupt request in the
USBNDDRIntSt register.
9.8.16 USB System Error Interrupt Status register (USBSysErrIntSt - 0xFFE0 C2B8)
If a system error (AHB bus error) occurs when transferring the data or when fetching or
updating the DD the corresponding bit is set in this register. USBSysErrIntSt is a read only
register.
Table 344. USB System Error Interrupt Status register (USBSysErrIntSt - address
0xFFE0 C2B8) bit description
Bit
Symbol
Value Description
Reset
value
31:0 EPxx
Endpoint xx (2 ≤ xx ≤ 31) System Error Interrupt request.
0
0
1
There is no System Error Interrupt request for endpoint xx.
There is a System Error Interrupt request for endpoint xx.
9.8.17 USB System Error Interrupt Clear register (USBSysErrIntClr - 0xFFE0 C2BC)
Writing one to a bit in this register clears the corresponding bit in the USBSysErrIntSt
register. Writing zero has no effect. USBSysErrIntClr is a write only register.
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Chapter 13: LPC24XX USB device controller
Table 345. USB System Error Interrupt Clear register (USBSysErrIntClr - address
0xFFE0 C2BC) bit description
Bit
Symbol Value Description
Reset
value
31:0 EPxx
Clear endpoint xx (2 ≤ xx ≤ 31) System Error Interrupt request.
0
0
1
No effect.
Clear the EPxx System Error Interrupt request in the
USBSysErrIntSt register.
9.8.18 USB System Error Interrupt Set register (USBSysErrIntSet - 0xFFE0 C2C0)
Writing one to a bit in this register sets the corresponding bit in the USBSysErrIntSt
register. Writing zero has no effect. USBSysErrIntSet is a write only register.
Table 346. USB System Error Interrupt Set register (USBSysErrIntSet - address 0xFFE0
C2C0) bit description
Bit
Symbol
Value Description
Reset
value
31:0 EPxx
Set endpoint xx (2 ≤ xx ≤ 31) System Error Interrupt request. 0
No effect.
0
1
Set the EPxx System Error Interrupt request in the
USBSysErrIntSt register.
10. Interrupt handling
This section describes how an interrupt event on any of the endpoints is routed to the
Vectored Interrupt Controller (VIC). For a diagram showing interrupt event handling, see
All non-isochronous OUT endpoints (control, bulk, and interrupt endpoints) generate an
interrupt when they receive a packet without an error. All non-isochronous IN endpoints
generate an interrupt when a packet has been succesfully transmitted or when a NAK
signal is sent and interrupts on NAK are enabled by the SIE Set Mode command, see
Section 13–11.3. For isochronous endpoints, a frame interrupt is generated every 1 ms.
The interrupt handling is different for Slave and DMA mode.
Slave mode
If an interrupt event occurs on an endpoint and the endpoint interrupt is enabled in the
USBEpIntEn register, the corresponding status bit in the USBEpIntSt is set. For
non-isochronous endpoints, all endpoint interrupt events are divided into two types by the
corresponding USBEpIntPri[n] registers: fast endpoint interrupt events and slow endpoint
interrupt events. All fast endpoint interrupt events are ORed and routed to bit EP_FAST in
the USBDevIntSt register. All slow endpoint interrupt events are ORed and routed to the
EP_SLOW bit in USBDevIntSt.
For isochronous endpoints, the FRAME bit in USBDevIntSt is set every 1 ms.
The USBDevIntSt register holds the status of all endpoint interrupt events as well as the
enabled in USBDevIntEn) are routed to the USB_INT_REQ_LP bit in the USBIntSt
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Chapter 13: LPC24XX USB device controller
register to request low priority interrupt handling. However, the USBDevIntPri register can
route either the FRAME or the EP_FAST bit to the USB_INT_REQ_HP bit in the USBIntSt
register.
Only one of the EP_FAST and FRAME interrupt events can be routed to the
USB_INT_REQ_HP bit. If routing both bits to USB_INT_REQ_HP is attempted, both
interrupt events are routed to USB_INT_REQ_LP.
Slow endpoint interrupt events are always routed directly to the USB_INT_REQ_LP bit for
low priority interrupt handling by software.
The final interrupt signal to the VIC is gated by the EN_USB_INTS bit in the USBIntSt
register. The USB interrupts are routed to VIC channel #22 only if EN_USB_INTS is set.
DMA mode
If an interrupt event occurs on a non-control endpoint and the endpoint interrupt is not
enabled in the USBEpIntEn register, the corresponding status bit in the USBDMARSt is
set by hardware. This serves as a flag for the DMA engine to transfer data if DMA transfer
is enabled for the corresponding endpoint in the USBEpDMASt register.
Three types of interrupts can occur for each endpoint for data transfers in DMA mode: End
of transfer interrupt , new DD request interrupt, and system error interrupt. These interrupt
events set a bit for each endpoint in the respective registers USBEoTIntSt,
USBNDDRIntSt, and USBSysErrIntSt. The End of transfer interrupts from all endpoints
are then Ored and routed to the EOT bit in USBDMAIntSt. Likewise, all New DD request
interrupts and system error interrupt events are routed to the NDDR and ERR bits
respectively in the USBDMAStInt register.
The EOT, NDDR, and ERR bits (if enabled in USBDMAIntEn) are ORed to set the
USB_INT_REQ_DMA bit in the USBIntSt register. If the EN_USB_INTS bit is set in
USBIntSt, the interrupt is routed to VIC channel #22.
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Chapter 13: LPC24XX USB device controller
interrupt
event on
EPn
Slave mode
from other
Endpoints
USBEpIntSt
USBDevIntSt
.
.
.
.
FRAME
EP_FAST
.
.
.
.
n
EP_SLOW
USBDevIntPri[0]
USBDevIntPri[1]
.
.
.
.
.
.
.
.
.
.
.
.
USBEpIntEn[n]
.
.
.
.
USBEpIntPri[n]
ERR_INT
USBDMARSt
n
USBIntSt
USB_INT_REQ_HP
to VIC
channel
#22
USB_INT_REQ_LP
USB_INT_REQ_DMA
to DMA engine
EN_USB_INTS
USBEoTIntST
0
DMA Mode
.
.
.
.
31
USBNDDRIntSt
0
USBDMAIntSt
.
EOT
NDDR
ERR
.
.
.
31
USBSysErrIntSt
0
.
.
.
.
31
For simplicity, USBDevIntEn and USBDMAIntEn are not shown.
Fig 47. Interrupt event handling
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Chapter 13: LPC24XX USB device controller
11. Serial interface engine command description
The functions and registers of the Serial Interface Engine (SIE) are accessed using
commands, which consist of a command code followed by optional data bytes (read or
registers are used for these accesses.
A complete access consists of two phases:
1. Command phase: the USBCmdCode register is written with the CMD_PHASE field
set to the value 0x05 (Command), and the CMD_CODE field set to the desired
command code. On completion of the command, the CCEMPTY bit of USBDevIntSt is
set.
2. Data phase (optional): for writes, the USBCmdCode register is written with the
CMD_PHASE field set to the value 0x01 (Write), and the CMD_WDATA field set with
the desired write data. On completion of the write, the CCEMPTY bit of USBDevIntSt
is set. For reads, USBCmdCode register is written with the CMD_PHASE field set to
the value 0x02 (Read), and the CMD_CODE field set with command code the read
corresponds to. On completion of the read, the CDFULL bit of USBDevInSt will be set,
indicating the data is available for reading in the USBCmdData register. In the case of
multi-byte registers, the least significant byte is accessed first.
Here is an example of the Read Current Frame Number command (reading 2 bytes):
USBDevIntClr = 0x30;
// Clear both CCEMPTY & CDFULL
USBCmdCode = 0x00F50500;
// CMD_CODE=0xF5, CMD_PHASE=0x05(Command)
while (!(USBDevIntSt & 0x10)); // Wait for CCEMPTY.
USBDevIntClr = 0x10;
USBCmdCode = 0x00F50200;
// Clear CCEMPTY interrupt bit.
// CMD_CODE=0xF5, CMD_PHASE=0x02(Read)
while (!(USBDevIntSt & 0x20)); // Wait for CDFULL.
USBDevIntClr = 0x20;
// Clear CDFULL.
CurFrameNum = USBCmdData;
USBCmdCode = 0x00F50200;
// Read Frame number LSB byte.
// CMD_CODE=0xF5, CMD_PHASE=0x02(Read)
while (!(USBDevIntSt & 0x20)); // Wait for CDFULL.
Temp = USBCmdData;
USBDevIntClr = 0x20;
// Read Frame number MSB byte
// Clear CDFULL interrupt bit.
CurFrameNum = CurFrameNum | (Temp << 8);
Here is an example of the Set Address command (writing 1 byte):
USBDevIntClr = 0x10;
// Clear CCEMPTY.
USBCmdCode = 0x00D00500;
// CMD_CODE=0xD0, CMD_PHASE=0x05(Command)
while (!(USBDevIntSt & 0x10)); // Wait for CCEMPTY.
USBDevIntClr = 0x10;
// Clear CCEMPTY.
USBCmdCode = 0x008A0100;
// CMD_WDATA=0x8A(DEV_EN=1, DEV_ADDR=0xA),
// CMD_PHASE=0x01(Write)
while (!(USBDevIntSt & 0x10)); // Wait for CCEMPTY.
USBDevIntClr = 0x10;
// Clear CCEMPTY.
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Chapter 13: LPC24XX USB device controller
Table 347. SIE command code table
Command name
Device commands
Set Address
Recipient
Code (Hex)
Data phase
Device
Device
Device
Device
Device
Device
Device
Device
Device
D0
D8
F3
F5
FD
FE
FE
FF
FB
Write 1 byte
Write 1 byte
Write 1 byte
Read 1 or 2 bytes
Read 2 bytes
Write 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Configure Device
Set Mode
Read Current Frame Number
Read Test Register
Set Device Status
Get Device Status
Get Error Code
Read Error Status
Endpoint Commands
Select Endpoint
Endpoint 0
00
01
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte
Endpoint 1
Endpoint xx
Endpoint 0
xx
Select Endpoint/Clear Interrupt
Set Endpoint Status
40
Endpoint 1
41
Read 1 byte
Endpoint xx
Endpoint 0
xx + 40
40
Read 1 byte
Write 1 byte
Endpoint 1
41
Write 1 byte
Endpoint xx
Selected Endpoint
Selected Endpoint
xx + 40
F2
Write 1 byte
Clear Buffer
Read 1 byte (optional)
None
Validate Buffer
FA
11.1 Set Address (Command: 0xD0, Data: write 1 byte)
The Set Address command is used to set the USB assigned address and enable the
(embedded) function. The address set in the device will take effect after the status stage
of the control transaction. After a bus reset, DEV_ADDR is set to 0x00, and DEV_EN is
set to 1. The device will respond to packets for function address 0x00, endpoint 0 (default
endpoint).
Table 348. Device Set Address Register bit description
Bit
Symbol
Description
Reset value
6:0
DEV_ADDR
Device address set by the software. After a bus reset this field is set to
0x00.
0x00
7
DEV_EN
Device Enable. After a bus reset this bit is set to 1.
0: Device will not respond to any packets.
0
1: Device will respond to packets for function address DEV_ADDR.
11.2 Configure Device (Command: 0xD8, Data: write 1 byte)
A value of 1 written to the register indicates that the device is configured and all the
enabled non-control endpoints will respond. Control endpoints are always enabled and
respond even if the device is not configured, in the default state.
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Chapter 13: LPC24XX USB device controller
Table 349. Configure Device Register bit description
Bit
Symbol
Description
Reset value
0
CONF_DEVICE
Device is configured. All enabled non-control endpoints will respond. This
bit is cleared by hardware when a bus reset occurs. When set, the
UP_LED signal is driven LOW if the device is not in the suspended state
(SUS=0).
7:1
-
Reserved, user software should not write ones to reserved bits. The value NA
read from a reserved bit is not defined.
11.3 Set Mode (Command: 0xF3, Data: write 1 byte)
Table 350. Set Mode Register bit description
Bit Symbol
Value Description
Reset
value
0
AP_CLK
Always PLL Clock.
0
0
1
USB_NEED_CLK is functional; the 48 MHz clock can be
stopped when the device enters suspend state.
USB_NEED_CLK is fixed to 1; the 48 MHz clock cannot be
stopped when the device enters suspend state.
1
2
INAK_CI
Interrupt on NAK for Control IN endpoint.
0
0
0
1
Only successful transactions generate an interrupt.
Both successful and NAKed IN transactions generate interrupts.
Interrupt on NAK for Control OUT endpoint.
INAK_CO
0
1
Only successful transactions generate an interrupt.
Both successful and NAKed OUT transactions generate
interrupts.
3
4
INAK_II
Interrupt on NAK for Interrupt IN endpoint.
0
0
0
1
Only successful transactions generate an interrupt.
Both successful and NAKed IN transactions generate interrupts.
Interrupt on NAK for Interrupt OUT endpoints.
INAK_IO[1]
0
1
Only successful transactions generate an interrupt.
Both successful and NAKed OUT transactions generate
interrupts.
5
6
INAK_BI
Interrupt on NAK for Bulk IN endpoints.
0
0
0
1
Only successful transactions generate an interrupt.
Both successful and NAKed IN transactions generate interrupts.
Interrupt on NAK for Bulk OUT endpoints.
INAK_BO[2]
0
1
Only successful transactions generate an interrupt.
Both successful and NAKed OUT transactions generate
interrupts.
7
-
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
[1] This bit should be reset to 0 if the DMA is enabled for any of the Interrupt OUT endpoints.
[2] This bit should be reset to 0 if the DMA is enabled for any of the Bulk OUT endpoints.
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11.4 Read Current Frame Number (Command: 0xF5, Data: read 1 or 2
bytes)
Returns the frame number of the last successfully received SOF. The frame number is
eleven bits wide. The frame number returns least significant byte first. In case the user is
only interested in the lower 8 bits of the frame number, only the first byte needs to be read.
• In case no SOF was received by the device at the beginning of a frame, the frame
number returned is that of the last successfully received SOF.
• In case the SOF frame number contained a CRC error, the frame number returned will
be the corrupted frame number as received by the device.
11.5 Read Test Register (Command: 0xFD, Data: read 2 bytes)
The test register is 16 bits wide. It returns the value of 0xA50F if the USB clocks (usbclk
and AHB slave clock) are running.
11.6 Set Device Status (Command: 0xFE, Data: write 1 byte)
The Set Device Status command sets bits in the Device Status Register.
Table 351. Set Device Status Register bit description
Bit Symbol Value Description
Reset
value
0
CON
The Connect bit indicates the current connect status of the
device. It controls the CONNECT output pin, used for
SoftConnect. Reading the connect bit returns the current connect
status. This bit is cleared by hardware when the VBUS status input
is LOW for more than 3 ms. The 3 ms delay filters out temporary
dips in the VBUS voltage.
0
0
1
Writing a 0 will make the CONNECT pin go HIGH.
Writing a 1 will make the CONNECT pin go LOW..
Connect Change.
1
2
CON_CH
0
0
0
1
This bit is cleared when read.
This bit is set when the device’s pull-up resistor is disconnected
because VBUS disappeared. The DEV_STAT interrupt is
generated when this bit is 1.
SUS
Suspend: The Suspend bit represents the current suspend state.
When the device is suspended (SUS = 1) and the CPU writes a 0
into it, the device will generate a remote wakeup. This will only
happen when the device is connected (CON = 1). When the
device is not connected or not suspended, writing a 0 has no
effect. Writing a 1 to this bit has no effect.
0
1
This bit is reset to 0 on any activity.
This bit is set to 1 when the device hasn’t seen any activity on its
upstream port for more than 3 ms.
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Chapter 13: LPC24XX USB device controller
Table 351. Set Device Status Register bit description
Bit Symbol Value Description
Reset
value
3
SUS_CH
Suspend (SUS) bit change indicator. The SUS bit can toggle
because:
0
• The device goes into the suspended state.
• The device is disconnected.
• The device receives resume signalling on its upstream port.
This bit is cleared when read.
0
1
SUS bit not changed.
SUS bit changed. At the same time a DEV_STAT interrupt is
generated.
4
RST
Bus Reset bit. On a bus reset, the device will automatically go to
the default state. In the default state:
0
• Device is unconfigured.
• Will respond to address 0.
• Control endpoint will be in the Stalled state.
• All endpoints are unrealized except control endpoints EP0
and EP1.
• Data toggling is reset for all endpoints.
• All buffers are cleared.
• There is no change to the endpoint interrupt status.
• DEV_STAT interrupt is generated.
Note: Bus resets are ignored when the device is not connected
(CON=0).
0
1
This bit is cleared when read.
This bit is set when the device receives a bus reset. A DEV_STAT
interrupt is generated.
7:5
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
11.7 Get Device Status (Command: 0xFE, Data: read 1 byte)
The Get Device Status command returns the Device Status Register. Reading the device
status returns 1 byte of data. The bit field definition is same as the Set Device Status
Remark: To ensure correct operation, the DEV_STAT bit of USBDevIntSt must be cleared
before executing the Get Device Status command.
11.8 Get Error Code (Command: 0xFF, Data: read 1 byte)
Different error conditions can arise inside the SIE. The Get Error Code command returns
the last error code that occurred. The 4 least significant bits form the error code.
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Chapter 13: LPC24XX USB device controller
Table 352. Get Error Code Register bit description
Bit Symbol Value Description
Reset
value
3:0 EC
Error Code.
0x0
0000
0001
0010
0011
No Error.
PID Encoding Error.
Unknown PID.
Unexpected Packet - any packet sequence violation from the
specification.
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
-
Error in Token CRC.
Error in Data CRC.
Time Out Error.
Babble.
Error in End of Packet.
Sent/Received NAK.
Sent Stall.
Buffer Overrun Error.
Sent Empty Packet (ISO Endpoints only).
Bitstuff Error.
Error in Sync.
Wrong Toggle Bit in Data PID, ignored data.
The Error Active bit will be reset once this register is read.
4
EA
-
7:5
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
11.9 Read Error Status (Command: 0xFB, Data: read 1 byte)
This command reads the 8-bit Error register from the USB device. This register records
which error events have recently occurred in the SIE. If any of these bits are set, the
ERR_INT bit of USBDevIntSt is set. The error bits are cleared after reading this register.
Table 353. Read Error Status Register bit description
Bit
0
Symbol
PID_ERR
UEPKT
Description
Reset value
PID encoding error or Unknown PID or Token CRC.
0
0
1
Unexpected Packet - any packet sequence violation from the
specification.
2
3
4
5
6
7
DCRC
Data CRC error.
0
0
0
0
0
0
TIMEOUT
EOP
Time out error.
End of packet error.
Buffer Overrun.
B_OVRN
BTSTF
Bit stuff error.
TGL_ERR
Wrong toggle bit in data PID, ignored data.
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11.10 Select Endpoint (Command: 0x00 - 0x1F, Data: read 1 byte (optional))
The Select Endpoint command initializes an internal pointer to the start of the selected
buffer in EP_RAM. Optionally, this command can be followed by a data read, which
returns some additional information on the packet(s) in the endpoint buffer(s). The
command code of the Select Endpoint command is equal to the physical endpoint
number. In the case of a single buffered endpoint the B_2_FULL bit is not valid.
Table 354. Select Endpoint Register bit description
Bit Symbol
Value Description
Reset
value
0
FE
Full/Empty. This bit indicates the full or empty status of the
0
endpoint buffer(s). For IN endpoints, the FE bit gives the
ANDed result of the B_1_FULL and B_2_FULL bits. For OUT
endpoints, the FE bit gives ORed result of the B_1_FULL and
B_2_FULL bits. For single buffered endpoints, this bit simply
reflects the status of B_1_FULL.
0
1
For an IN endpoint, at least one write endpoint buffer is empty.
For an OUT endpoint, at least one endpoint read buffer is full.
Stalled endpoint indicator.
1
2
ST
0
0
0
1
The selected endpoint is not stalled.
The selected endpoint is stalled.
STP
SETUP bit: the value of this bit is updated after each
successfully received packet (i.e. an ACKed package on that
particular physical endpoint).
0
1
The STP bit is cleared by doing a Select Endpoint/Clear
Interrupt on this endpoint.
The last received packet for the selected endpoint was a
SETUP packet.
3
4
PO
Packet over-written bit.
0
0
0
1
The PO bit is cleared by the ‘Select Endpoint/Clear Interrupt’
command.
The previously received packet was over-written by a SETUP
packet.
EPN
EP NAKed bit indicates sending of a NAK. If the host sends an
OUT packet to a filled OUT buffer, the device returns NAK. If
the host sends an IN token packet to an empty IN buffer, the
device returns NAK.
0
1
The EPN bit is reset after the device has sent an ACK after an
OUT packet or when the device has seen an ACK after sending
an IN packet.
The EPN bit is set when a NAK is sent and the interrupt on NAK
feature is enabled.
5
B_1_FULL
The buffer 1 status.
Buffer 1 is empty.
Buffer 1 is full.
0
0
1
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Table 354. Select Endpoint Register bit description
Bit Symbol Value Description
Reset
value
6
B_2_FULL
The buffer 2 status.
0
0
1
-
Buffer 2 is empty.
Buffer 2 is full.
7
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
11.11 Select Endpoint/Clear Interrupt (Command: 0x40 - 0x5F, Data: read 1
byte)
Commands 0x40 to 0x5F are identical to their Select Endpoint equivalents, with the
following differences:
• They clear the bit corresponding to the endpoint in the USBEpIntSt register.
• In case of a control OUT endpoint, they clear the STP and PO bits in the
corresponding Select Endpoint Register.
• Reading one byte is obligatory.
Remark: This command may be invoked by using the USBCmdCode and USBCmdData
registers, or by setting the corresponding bit in USBEpIntClr. For ease of use, using the
USBEpIntClr register is recommended.
11.12 Set Endpoint Status (Command: 0x40 - 0x55, Data: write 1 byte
(optional))
The Set Endpoint Status command sets status bits 7:5 and 0 of the endpoint. The
Command Code of Set Endpoint Status is equal to the sum of 0x40 and the physical
endpoint number in hex. Not all bits can be set for all types of endpoints.
Table 355. Set Endpoint Status Register bit description
Bit Symbol Value Description
Reset
value
0
ST
Stalled endpoint bit. A Stalled control endpoint is automatically
unstalled when it receives a SETUP token, regardless of the
content of the packet. If the endpoint should stay in its stalled
state, the CPU can stall it again by setting this bit. When a stalled
endpoint is unstalled - either by the Set Endpoint Status
command or by receiving a SETUP token - it is also re-initialized.
This flushes the buffer: in case of an OUT buffer it waits for a
DATA 0 PID; in case of an IN buffer it writes a DATA 0 PID. There
is no change of the interrupt status of the endpoint. When
already unstalled, writing a zero to this bit initializes the endpoint.
When an endpoint is stalled by the Set Endpoint Status
command, it is also re-initialized.
0
0
1
-
The endpoint is unstalled.
The endpoint is stalled.
4:1
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
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Table 355. Set Endpoint Status Register bit description
Bit Symbol Value Description
Reset
value
5
DA
Disabled endpoint bit.
0
0
1
The endpoint is enabled.
The endpoint is disabled.
Rate Feedback Mode.
6
RF_MO
0
0
1
Interrupt endpoint is in the Toggle mode.
Interrupt endpoint is in the Rate Feedback mode. This means
that transfer takes place without data toggle bit.
7
CND_ST
Conditional Stall bit.
0
0
1
Unstalls both control endpoints.
Stall both control endpoints, unless the STP bit is set in the
Select Endpoint register. It is defined only for control OUT
endpoints.
11.13 Clear Buffer (Command: 0xF2, Data: read 1 byte (optional))
When an OUT packet sent by the host has been received successfully, an internal
hardware FIFO status Buffer_Full flag is set. All subsequent packets will be refused by
returning a NAK. When the device software has read the data, it should free the buffer by
issuing the Clear Buffer command. This clears the internal Buffer_Full flag. When the
buffer is cleared, new packets will be accepted.
When bit 0 of the optional data byte is 1, the previously received packet was over-written
by a SETUP packet. The Packet over-written bit is used only in control transfers.
According to the USB specification, a SETUP packet should be accepted irrespective of
the buffer status. The software should always check the status of the PO bit after reading
the SETUP data. If it is set then it should discard the previously read data, clear the PO bit
by issuing a Select Endpoint/Clear Interrupt command, read the new SETUP data and
again check the status of the PO bit.
used.
Table 356. Clear Buffer Register bit description
Bit Symbol Value Description
Reset
value
0
PO
Packet over-written bit. This bit is only applicable to the control
endpoint EP0.
0
0
1
The previously received packet is intact.
The previously received packet was over-written by a later SETUP
packet.
7:1
-
-
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
11.14 Validate Buffer (Command: 0xFA, Data: none)
When the CPU has written data into an IN buffer, software should issue a Validate Buffer
command. This tells hardware that the buffer is ready for sending on the USB bus.
Hardware will send the contents of the buffer when the next IN token packet is received.
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Internally, there is a hardware FIFO status flag called Buffer_Full. This flag is set by the
Validate Buffer command and cleared when the data has been sent on the USB bus and
the buffer is empty.
A control IN buffer cannot be validated when its corresponding OUT buffer has the Packet
Over-written (PO) bit (see the Clear Buffer Register) set or contains a pending SETUP
packet. For the control endpoint the validated buffer will be invalidated when a SETUP
packet is received.
used.
12. USB device controller initialization
The LPC2400 USB device controller initialization includes the following steps:
1. Enable the device controller by setting the PCUSB bit of PCONP.
2. Configure and enable the PLL and Clock Dividers to provide 48 MHz for usbclk, and
the desired frequency for cclk. For correct operation of synchronization logic in the
device controller, the minimum cclk frequency is 18 MHz. For the procedure for
determining the PLL setting and configuration, see Section 4–3.2.12 “Procedure for
3. Enable the device controller clocks by setting DEV_CLK_EN and AHB_CLK_EN bits
in the USBClkCtrl register. Poll the respective clock bits in the USBClkSt register until
they are set.
4. Select the desired USB port pins using the USBPortSel register. The
PORTSEL_CLK_EN bit must be set in USBClkCtrl before accessing USBPortSel and
should be cleared after accessing USBPortSel.
5. Enable the USB pin functions by writing to the corresponding PINSEL register.
6. Disable the pull-up resistor on the VBUS pin using the corresponding PINMODE
register.
7. Set USBEpIn and USBMaxPSize registers for EP0 and EP1, and wait until the
EP_RLZED bit in USBDevIntSt is set so that EP0 and EP1 are realized.
8. Enable endpoint interrupts (Slave mode):
– Clear all endpoint interrupts using USBEpIntClr.
– Clear any device interrupts using USBDevIntClr.
– Enable Slave mode for the desired endpoints by setting the corresponding bits in
USBEpIntEn.
– Set the priority of each enabled interrupt using USBEpIntPri.
– Configure the desired interrupt mode using the SIE Set Mode command.
– Enable device interrupts using USBDevIntEn (normally DEV_STAT, EP_SLOW,
and possibly EP_FAST).
9. Configure the DMA (DMA mode):
– Disable DMA operation for all endpoints using USBEpDMADis.
– Clear any pending DMA requests using USBDMARClr.
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– Clear all DMA interrupts using USBEoTIntClr, USBNDDRIntClr, and
USBSysErrIntClr.
– Prepare the UDCA in system memory.
– Write the desired address for the UDCA to USBUDCAH (for example 0x7FD0
0000).
– Enable the desired endpoints for DMA operation using USBEpDMAEn.
– Set EOT, DDR, and ERR bits in USBDMAIntEn.
10. Install USB interrupt handler in the VIC by writing its address to the corresponding
VICVectAddr register and enabling the USB interrupt in the VICIntEnable register.
11. Set default USB address to 0x0 and DEV_EN to 1 using the SIE Set Address
command. A bus reset will also cause this to happen.
12. Set CON bit to 1 to make CONNECT active using the SIE Set Device Status
command.
The configuration of the endpoints varies depending on the software application. By
default, all the endpoints are disabled except control endpoints EP0 and EP1. Additional
endpoints are enabled and configured by software after a SET_CONFIGURATION or
SET_INTERFACE device request is received from the host.
13. Slave mode operation
In Slave mode, the CPU transfers data between RAM and the endpoint buffer using the
Register Interface.
13.1 Interrupt generation
In slave mode, data packet transfer between RAM and an endpoint buffer can be initiated
in response to an endpoint interrupt. Endpoint interrupts are enabled using the
USBEpIntEn register, and are observable in the USBEpIntSt register.
All non-isochronous OUT endpoints generate an endpoint interrupt when they receive a
packet without an error. All non-isochronous IN endpoints generate an interrupt when a
packet is successfully transmitted, or when a NAK handshake is sent on the bus and the
interrupt on NAK feature is enabled.
For Isochronous endpoints, transfer of data is done when the FRAME interrupt (in
USBDevIntSt) occurs.
13.2 Data transfer for OUT endpoints
When the software wants to read the data from an endpoint buffer it should set the
RD_EN bit and program LOG_ENDPOINT with the desired endpoint number in the
USBCtrl register. The control logic will fetch the packet length to the USBRxPLen register,
When the end of packet is reached, the RD_EN bit is cleared, and the RxENDPKT bit is
command. The endpoint is now ready to accept the next packet. For OUT isochronous
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endpoints, the next packet will be received irrespective of whether the buffer has been
cleared. Any data not read from the buffer before the end of the frame is lost. See
Section 13–15 “Double buffered endpoint operation” for more details.
If the software clears RD_EN before the entire packet is read, reading is terminated, and
the data remains in the endpoint’s buffer. When RD_EN is set again for this endpoint, the
data will be read from the beginning.
13.3 Data transfer for IN endpoints
When writing data to an endpoint buffer, WR_EN (Section 13–9.6.5 “USB Control register
continuously in the USBTxData register.
When the the number of bytes programmed in USBTxPLen have been written to
USBTxData, the WR_EN bit is cleared, and the TxENDPKT bit is set in the USBDevIntSt
register. Software issues a Validate Buffer (Section 13–11.14 “Validate Buffer (Command:
0xFA, Data: none)”) command. The endpoint is now ready to send the packet. For IN
isochronous endpoints, the data in the buffer will be sent only if the buffer is validated
before the next FRAME interrupt occurs; otherwise, an empty packet will be sent in the
next frame. If the software clears WR_EN before the entire packet is written, writing will
start again from the beginning the next time WR_EN is set for this endpoint.
Both RD_EN and WR_EN can be high at the same time for the same logical endpoint.
Interleaved read and write operation is possible.
14. DMA operation
In DMA mode, the DMA transfers data between RAM and the endpoint buffer.
The following sections discuss DMA mode operation. Background information is given in
“Triggering the DMA engine”. The fields of the DMA Descriptor are described in section
Section 13–14.4 “The DMA descriptor”. The last three sections describe DMA operation:
14.1 Transfer terminology
Within this section three types of transfers are mentioned:
1. USB transfers – transfer of data over the USB bus. The USB 2.0 specification refers
to these simply as transfers. Within this section they are referred to as USB transfers
to distinguish them from DMA transfers. A USB transfer is composed of transactions.
Each transaction is composed of packets.
2. DMA transfers – the transfer of data between an endpoint buffer and system memory
(RAM).
3. Packet transfers – in this section, a packet transfer refers to the transfer of a packet of
data between an endpoint buffer and system memory (RAM). A DMA transfer is
composed of one or more packet transfers.
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14.2 USB device communication area
The CPU and DMA controller communicate through a common area of memory, called the
USB Device Communication Area, or UDCA. The UDCA is a 32-word array of DMA
Descriptor Pointers (DDPs), each of which corresponds to a physical endpoint. Each DDP
points to the start address of a DMA Descriptor, if one is defined for the endpoint. DDPs
for unrealized endpoints and endpoints disabled for DMA operation are ignored and can
be set to a NULL (0x0) value.
The start address of the UDCA is stored in the USBUDCAH register. The UDCA can
reside at any 128-byte boundary of RAM that is accessible to both the CPU and DMA
controller.
Figure 36 illustrates the UDCA and its relationship to the UDCA Head (USBUDCAH)
register and DMA Descriptors.
UDCA
NULL
NULL
0
NULL
Next_DD_pointer
DD-EP2-a
Next_DD_pointer
DD-EP2-b
Next_DD_pointer
DD-EP2-c
1
2
DDP-EP2
NULL
UDCA HEAD
REGISTER
NULL
Next_DD_pointer
DD-EP16-a
Next_DD_pointer
DD-EP16-b
16
31
DDP-EP16
DDP-EP31
Fig 48. UDCA Head register and DMA Descriptors
14.3 Triggering the DMA engine
An endpoint raises a DMA request when Slave mode is disabled by setting the
interrupt occurs (see Section 13–9.8.1 “USB DMA Request Status register (USBDMARSt
A DMA transfer for an endpoint starts when the endpoint is enabled for DMA operation in
USBEpDMASt, the corresponding bit in USBDMARSt is set, and a valid DD is found for
the endpoint.
All endpoints share a single DMA channel to minimize hardware overhead. If more than
one DMA request is active in USBDMARSt, the endpoint with the lowest physical endpoint
number is processed first.
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In DMA mode, the bits corresponding to Interrupt on NAK for Bulk OUT and Interrupt OUT
endpoints (INAK_BO and INAK_IO) should be set to 0 using the SIE Set Mode command
14.4 The DMA descriptor
DMA transfers are described by a data structure called the DMA Descriptor (DD).
DDs are placed in the USB RAM. These descriptors can be located anywhere in the USB
RAM at word-aligned addresses. USB RAM is part of the system memory that is used for
the USB purposes. It is located at address 0x7FD0 0000 and is 8 kB in size.
DDs for non-isochronous endpoints are four words long. DDs for isochronous endpoints
are five words long.
The parameters associated with a DMA transfer are:
• The start address of the DMA buffer
• The length of the DMA buffer
• The start address of the next DMA descriptor
• Control information
• Count information (number of bytes transferred)
• Status information
Table 357. DMA descriptor
Word
Access Access Bit
Description
position (H/W)
(S/W)
R/W
R/W
R/W
-
position
0
1
R
R
R
-
31:0
1:0
2
Next_DD_pointer (USB RAM address)
DMA_mode (00 -Normal; 01 - ATLE)
Next_DD_valid (1 - valid; 0 - invalid)
Reserved
3
R
R/W
4
Isochronous_endpoint (1 - isochronous;
0 - non-isochronous)
R
R/W[1]
R/W
R/W
15:5
Max_packet_size
31:16
DMA_buffer_length
This value is specified in bytes for non-isochronous
endpoints and in number of packets for isochronous
endpoints.
2
R/W
R/W
31:0
DMA_buffer_start_addr
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Table 357. DMA descriptor
Word Access Access Bit
position (H/W)
Description
(S/W)
R/I
position
3
R/W
W
0
DD_retired (To be initialized to 0)
DD_status (To be initialized to 0000):
0000 - NotServiced
R/I
4:1
0001 - BeingServiced
0010 - NormalCompletion
0011 - DataUnderrun (short packet)
1000 - DataOverrun
1001 - SystemError
W
R/I
R/I
R/I
W
5
Packet_valid (To be initialized to 0)
LS_byte_extracted (ATLE mode) (To be initialized to 0)
MS_byte_extracted (ATLE mode) (To be initialized to 0)
Message_length_position (ATLE mode)
Reserved
W
6
W
7
R
13:8
15:14
31:16
31:0
-
-
R/W
R/W
R/I
R/W
Present_DMA_count (To be initialized to 0)
Isochronous_packetsize_memory_address
4
[1] Write only in ATLE mode
Legend: R - Read; W - Write; I - Initialize
14.4.1 Next_DD_pointer
Pointer to the memory location from where the next DMA descriptor will be fetched.
14.4.2 DMA_mode
Specifies the DMA mode of operation. Two modes have been defined: Normal and
Automatic Transfer Length Extraction (ATLE) mode. In normal mode, software initializes
the DMA_buffer_length for OUT endpoints. In ATLE mode, the DMA_buffer_length is
extracted from the incoming data. See Section 13–14.7 “Auto Length Transfer Extraction
(ATLE) mode operation” on page 382 for more details.
14.4.3 Next_DD_valid
This bit indicates whether the software has prepared the next DMA descriptor. If set, the
DMA engine fetches the new descriptor when it is finished with the current one.
14.4.4 Isochronous_endpoint
When set, this bit indicates that the descriptor belongs to an isochronous endpoint. Hence
5 words have to be read when fetching it.
14.4.5 Max_packet_size
The maximum packet size of the endpoint. This parameter is used while transferring the
data for IN endpoints from the memory. It is used for OUT endpoints to detect the short
packet. This is applicable to non-isochronous endpoints only. This field should be set to
the same MPS value that is assigned for the endpoint using the USBMaxPSize register.
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14.4.6 DMA_buffer_length
This indicates the depth of the DMA buffer allocated for transferring the data. The DMA
engine will stop using this descriptor when this limit is reached and will look for the next
descriptor.
In Normal mode operation, software sets this value for both IN and OUT endpoints. In
ATLE mode operation, software sets this value for IN endpoints only. For OUT endpoints,
hardware sets this value using the extracted length of the data stream.
For isochronous endpoints, DMA_buffer_length is specified in number of packets, for
non-isochronous endpoints in bytes.
14.4.7 DMA_buffer_start_addr
The address where the data is read from or written to. This field is updated each time the
DMA engine finishes transferring a packet.
14.4.8 DD_retired
This bit is set by hardware when the DMA engine finishes the current descriptor. This
happens when the end of the buffer is reached, a short packet is transferred
(non-isochronous endpoints), or an error condition is detected.
14.4.9 DD_status
The status of the DMA transfer is encoded in this field. The following codes are defined:
• NotServiced - No packet has been transferred yet.
• BeingServiced - At least one packet is transferred.
• NormalCompletion - The DD is retired because the end of the buffer is reached and
there were no errors. The DD_retired bit is also set.
• DataUnderrun - Before reaching the end of the DMA buffer, the USB transfer is
terminated because a short packet is received. The DD_retired bit is also set.
• DataOverrun - The end of the DMA buffer is reached in the middle of a packet
transfer. This is an error situation. The DD_retired bit is set. The present DMA count
field is equal to the value of DMA_buffer_length. The packet must be re-transmitted
from the endpoint buffer in another DMA transfer. The corresponding
EPxx_DMA_ENABLE bit in USBEpDMASt is cleared.
• SystemError - The DMA transfer being serviced is terminated because of an error on
the AHB bus. The DD_retired bit is not set in this case. The corresponding
EPxx_DMA_ENABLE in USBEpDMASt is cleared. Since a system error can happen
while updating the DD, the DD fields in RAM may be unreliable.
14.4.10 Packet_valid
This bit is used for isochronous endpoints. It indicates whether the last packet transferred
to the memory is received with errors or not. This bit is set if the packet is valid, i.e., it was
received without errors. See Section 13–14.6 “Isochronous endpoint operation” on page
380 for isochronous endpoint operation.
This bit is unnecessary for non-isochronous endpoints because a DMA request is
generated only for packets without errors, and thus Packet_valid will always be set when
the request is generated.
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14.4.11 LS_byte_extracted
Used in ATLE mode. When set, this bit indicates that the Least Significant Byte (LSB) of
the transfer length has been extracted. The extracted size is reflected in the
DMA_buffer_length field, bits 23:16.
14.4.12 MS_byte_extracted
Used in ATLE mode. When set, this bit indicates that the Most Significant Byte (MSB) of
the transfer size has been extracted. The size extracted is reflected in the
DMA_buffer_length field, bits 31:24. Extraction stops when LS_Byte_extracted and
MS_byte_extracted bits are set.
14.4.13 Present_DMA_count
The number of bytes transferred by the DMA engine. The DMA engine updates this field
after completing each packet transfer.
For isochronous endpoints, Present_DMA_count is the number of packets transferred; for
non-isochronous endpoints, Present_DMA_count is the number of bytes.
14.4.14 Message_length_position
Used in ATLE mode. This field gives the offset of the message length position embedded
in the incoming data packets. This is applicable only for OUT endpoints. Offset 0 indicates
that the message length starts from the first byte of the first packet.
14.4.15 Isochronous_packetsize_memory_address
The memory buffer address where the packet size information along with the frame
isochronous endpoints only.
14.5 Non-isochronous endpoint operation
14.5.1 Setting up DMA transfers
Software prepares the DMA Descriptors (DDs) for those physical endpoints to be enabled
for DMA transfer. These DDs are present in the USB RAM. The start address of the first
DD is programmed into the DMA Description pointer (DDP) location for the corresponding
endpoint in the UDCA. Software then sets the EPxx_DMA_ENABLE bit for this endpoint in
is set to ‘00’ for normal mode operation. All other DD fields are initialized as specified in
DMA operation is not supported for physical endpoints 0 and 1 (default control endpoints).
14.5.2 Finding DMA Descriptor
When there is a trigger for a DMA transfer for an endpoint, the DMA engine will first
determine whether a new descriptor has to the fetched or not. A new descriptor does not
have to be fetched if the last packet transferred was for the same endpoint and the DD is
not yet in the retired state. An internal flag called DMA_PROCEED is used to identify this
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If a new descriptor has to be read, the DMA engine will calculate the location of the DDP
for this endpoint and will fetch the start address of the DD from this location. A DD start
address at location zero is considered invalid. In this case the NDDR interrupt is raised.
All other word-aligned addresses are considered valid.
When the DD is fetched, the DD status word (word 3) is read first and the status of the
DD_retired bit is checked. If not set, DDP points to a valid DD. If DD_retired is set, the
DMA engine will read the control word (word 1) of the DD.
If Next_DD_valid bit is set, the DMA engine will fetch the Next_DD_pointer field (word 0)
of the DD and load it to the DDP. The new DDP is written to the UDCA area.
The full DD (4 words) will then be fetched from the address in the DDP. The DD will give
the details of the DMA transfer to be done. The DMA engine will load its hardware
resources with the information fetched from the DD (start address, DMA count etc.).
If Next_DD_valid is not set and DD_retired bit is set, the DMA engine raises the NDDR
interrupt for this endpoint and clears the corresponding EPxx_DMA_ENABLE bit.
14.5.3 Transferring the data
For OUT endpoints, the current packet is read from the EP_RAM by the DMA Engine and
transferred to the USB RAM memory locations starting from DMA_buffer_start_addr. For
IN endpoints, the data is fetched from the USB RAM at DMA_buffer_start_addr and
written to the EP_RAM. The DMA_buffer_start_addr and Present_DMA_count fields are
updated after each packet is transferred.
14.5.4 Optimizing descriptor fetch
A DMA transfer normally involves multiple packet transfers. Hardware will not re-fetch a
new DD from memory unless the endpoint changes. To indicate an ongoing multi-packet
transfer, hardware sets an an internal flag called DMA_PROCEED.
The DMA_PROCEED flag is cleared after the required number of bytes specified in the
DMA_buffer_length field is transferred. It is also cleared when the software writes into the
USBEpDMADis register. The ability to clear the DMA_PROCEED flag allows software to
to force the DD to be re-fetched for the next packet transfer. Writing all zeros into the
USBEpDMADis register clears the DMA_PROCEED flag without disabling DMA operation
for any endpoint.
14.5.5 Ending the packet transfer
On completing a packet transfer, the DMA engine writes back the DD with updated status
information to the same memory location from where it was read. The
DMA_buffer_start_addr, Present_DMA_count, and the DD_status fields in the DD are
updated.
A DD can have the following types of completion:
Normal completion - If the current packet is fully transferred and the
Present_DMA_count field equals the DMA_buffer_length, the DD has completed
normally. The DD will be written back to memory with DD_retired set and DD_status set
to NormalCompletion. The EOT interrupt is raised for this endpoint.
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USB transfer end completion - If the current packet is fully transferred and its size is
less than the Max_packet_size field, and the end of the DMA buffer is still not reached,
the USB transfer end completion occurs. The DD will be written back to the memory
with DD_retired set and DD_Status set to the DataUnderrun completion code. The EOT
interrupt is raised for this endpoint.
Error completion - If the current packet is partially transferred i.e. the end of the DMA
buffer is reached in the middle of the packet transfer, an error situation occurs. The DD
is written back with DD_retired set and DD_status set to the DataOverrun status code.
The EOT interrupt is raised for this endpoint and the corresponding bit in USBEpDMASt
register is cleared. The packet will be re-sent from the endpoint buffer to memory when
the corresponding EPxx_DMA_ENABLE bit is set again using the USBEpDMAEn
register.
14.5.6 No_Packet DD
For an IN transfer, if the system does not have any data to send for a while, it can respond
to an NDDR interrupt by programming a No_Packet DD. This is done by setting both the
Max_packet_size and DMA_buffer_length fields in the DD to 0. On processing a
No_Packet DD, the DMA engine clears the DMA request bit in USBDMARSt
corresponding to the endpoint without transferring a packet. The DD is retired with a
status code of NormalCompletion. This can be repeated as often as necessary. The
device will respond to IN token packets on the USB bus with a NAK until a DD with a data
packet is programmed and the DMA transfers the packet into the endpoint buffer.
14.6 Isochronous endpoint operation
For isochronous endpoints, the packet size can vary for each packet. There is one packet
per isochronous endpoint for each frame.
14.6.1 Setting up DMA transfers
Software sets the isochronous endpoint bit to 1 in the DD, and programs the initial value of
the Isochronous_packetsize_memory_address field. All other fields are initialized the
same as for non-isochronous endpoints.
For isochronous endpoints, the DMA_buffer_length and Present_DMA_count fields are in
frames rather than bytes.
14.6.2 Finding the DMA Descriptor
Finding the descriptors is done in the same way as that for a non-isochronous endpoint.
A DMA request will be placed for DMA-enabled isochronous endpoints on every FRAME
interrupt. On processing the request, the DMA engine will fetch the descriptor and if
Isochronous_endpoint is set, will fetch the Isochronous_packetsize_memory_address
from the fifth word of the DD.
14.6.3 Transferring the Data
The data is transferred to or from the memory location DMA_buffer_start_addr. After the
end of the packet transfer the Present_DMA_count value is incremented by 1.
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Chapter 13: LPC24XX USB device controller
The isochronous packet size is stored in memory as shown in figure 32. Each word in the
packet size memory shown is divided into fields: Frame_number (bits 31 to 17),
Packet_valid (bit 16), and Packet_length (bits 15 to 0). The space allocated for the packet
size memory for a given DD should be DMA_buffer_length words in size – one word for
each packet to transfer.
OUT endpoints
At the completion of each frame, the packet size is written to the address location in
Isochronous_packet_size_memory_address, and
Isochronous_packet_size_memory_address is incremented by 4.
IN endpoints
Only the Packet_length field of the isochronous packet size word is used. For each frame,
an isochronous data packet of size specified by this field is transferred from the USB
device to the host, and Isochronous_packet_size_memory_address is incremented by 4
at the end of the packet transfer. If Packet_length is zero, an empty packet will be sent by
the USB device.
14.6.4 DMA descriptor completion
DDs for isochronous endpoints can only end with a status code of NormalCompletion
since there is no short packet on Isochronous endpoints, and the USB transfer continues
indefinitely until a SystemError occurs. There is no DataOverrun detection for isochronous
endpoints.
14.6.5 Isochronous OUT Endpoint Operation Example
Assume that an isochronous endpoint is programmed for the transfer of 10 frames and
that the transfer begins when the frame number is 21. After transferring four frames with
packet sizes of 10,15, 8 and 20 bytes without errors, the descriptor and memory map
The_total_number_of_bytes_transferred = 0x0A + 0x0F + 0x08 + 0x14 = 0x35.
The Packet_valid bit (bit 16) of all the words in the packet length memory is set to 1.
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Chapter 13: LPC24XX USB device controller
Next_DD_Pointer
W0
NULL
DMA_buffer_length
Max_packet_size
Isochronous_endpoint
Next_DD_Valid
DMA_mode
W1
W2
0x000A
0x0
1
0
0
DMA_buffer_start_addr
0x80000000
Present_DMA_Count
ATLE settings
Packet_Valid
DD_Status
DD_Retired
W3
W4
NA
NA
0x0
0
0x0
Isocronous_packetsize_memory_address
0x60000000
after 4 packets
0x0
W0
W1
W2
W3
W4
0x000A0010
0x80000035
FULL
0x4
-
-
0x1
0
frame_ number Packet_Valid Packet_Length
EMPTY
31
16
15
0
0x60000010
21
22
23
24
1
1
1
1
10
15
8
20
data memory
packet size memory
Fig 49. Isochronous OUT endpoint operation example
14.7 Auto Length Transfer Extraction (ATLE) mode operation
Some host drivers such as NDIS (Network Driver Interface Specification) host drivers are
capable of concatenating small USB transfers (delta transfers) to form a single large USB
transfer. For OUT USB transfers, the device hardware has to break up this concatenated
transfer back into the original delta transfers and transfer them to separate DMA buffers.
This is achieved by setting the DMA mode to Auto Transfer Length Extraction (ATLE)
mode in the DMA descriptor. ATLE mode is supported for Bulk endpoints only.
OUT transfers in ATLE mode
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Chapter 13: LPC24XX USB device controller
data to be sent
by host driver
data in packets
as seen on USB
data to be stored in USB
RAM by DMA engine
DMA_buffer_start_addr
of DD1
160 bytes
64 bytes
64 bytes
160 bytes
32 bytes
32 bytes
100 bytes
100 bytes
64 bytes
4 bytes
DMA_buffer_start_addr
of DD2
Fig 50. Data transfer in ATLE mode
Figure 13–50 shows a typical OUT USB transfer in ATLE mode, where the host
concatenates two USB transfers of 160 bytes and 100 bytes, respectively. Given a
MaxPacketSize of 64, the device hardware interprets this USB transfer as four packets of
64 bytes and a short packet of 4 bytes. The third and fourth packets are concatenated.
Note that in Normal mode, the USB transfer would be interpreted as packets of 64, 64, 32,
and 64 and 36 bytes.
It is now the responsibility of the DMA engine to separate these two USB transfers and put
them in the memory locations in the DMA_buffer_start_addr field of DMA Descriptor 1
(DD1) and DMA Descriptor 2 (DD2).
Hardware reads the two-byte-wide DMA_buffer_length at the offset (from the start of the
USB transfer) specified by Message_length_position from the incoming data packets and
writes it in the DMA_buffer_length field of the DD. To ensure that both bytes of the
DMA_buffer_length are extracted in the event they are split between two packets, the
flags LS_byte_extracted and MS_byte_extracted are set by hardware after the respective
byte is extracted. After the extraction of the MS byte, the DMA transfer continues as in the
normal mode.
The flags LS_byte_extracted and MS_byte_extracted are set to 0 by software when
preparing a new DD. Therefore, once a DD is retired, the transfer length is extracted again
for the next DD.
If DD1 is retired during the transfer of a concatenated packet (such as the third packet in
Figure 13–50), and DD2 is not programmed (Next_DD_valid field of DD1 is 0), then DD1
is retired with DD_status set to the DataOverrun status code. This is treated as an error
condition and the corresponding EPxx_DMA_ENABLE bit of USBEpDMASt is cleared by
hardware.
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Chapter 13: LPC24XX USB device controller
In ATLE mode, the last buffer length to be transferred always ends with a short or empty
packet indicating the end of the USB transfer. If the concatenated transfer lengths are
such that the USB transfer ends on a MaxPacketSize packet boundary, the (NDIS) host
will send an empty packet to mark the end of the USB transfer.
IN transfers in ATLE mode
For IN USB transfers from the device to the host, DMA_buffer_length is set by the device
software as in normal mode.
In ATLE mode, the device concatenates data from multiple DDs to form a single USB
transfer. If a DD is retired in the middle of a packet (packet size is less than
MaxPacketSize), the next DD referenced by Next_DD_pointer is fetched, and the
remaining bytes to form a packet of MaxPacketSize are transferred from the next DD’s
buffer.
If the next DD is not programmed (i.e. Next_DD_valid field in DD is 0), and the DMA buffer
length for the current DD has completed before the MaxPacketSize packet boundary, then
the available bytes from current DD are sent as a short packet on USB, which marks the
end of the USB transfer for the host.
If the last buffer length completes on a MaxPacketSize packet boundary, the device
software must program the next DD with DMA_buffer_length field 0, so that an empty
packet is sent by the device to mark the end of the USB transfer for the host.
14.7.1 Setting up the DMA transfer
For OUT endpoints, the host hardware needs to set the field Message_length_position in
the DD. This indicates the start location of the message length in the incoming data
packets. Also the device software has to set the DMA_buffer_length field to 0 for OUT
endpoints because this field is updated by the device hardware after the extraction of the
buffer length.
For IN endpoints, descriptors are set in the same way as in normal mode operation.
Since a single packet can be split between two DDs, software should always keep two
DDs ready, except for the last DMA transfer which ends with a short or empty packet.
14.7.2 Finding the DMA Descriptor
DMA descriptors are found in the same way as the normal mode operation.
14.7.3 Transferring the Data
OUT endpoints
If the LS_byte_extracted or MS_byte_extracted bit in the status field is not set, the
hardware will extract the transfer length from the data stream and program
DMA_buffer_length. Once the extraction is complete both the LS_byte_extracted and
MS_byte_extracted bits will be set.
IN endpoints
The DMA transfer proceeds as in normal mode and continues until the number of bytes
transferred equals the DMA_buffer_length.
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Chapter 13: LPC24XX USB device controller
14.7.4 Ending the packet transfer
The DMA engine proceeds with the transfer until the number of bytes specified in the field
DMA_buffer_length is transferred to or from the USB RAM. Then the EOT interrupt will be
generated. If this happens in the middle of the packet, the linked DD will get loaded and
the remaining part of the packet gets transferred to or from the address pointed by the
new DD.
OUT endpoints
If the linked DD is not valid and the packet is partially transferred to memory, the DD ends
with DataOverrun status code set, and the DMA will be disabled for this endpoint.
Otherwise DD_status will be updated with the NormalCompletion status code.
IN endpoints
If the linked DD is not valid and the packet is partially transferred to USB, the DD ends
with a status code of NormalCompletion in the DD_status field. This situation corresponds
to the end of the USB transfer, and the packet will be sent as a short packet. Also, when
the linked DD is valid and buffer length is 0, an empty packet will be sent to indicate the
end of the USB transfer.
15. Double buffered endpoint operation
The Bulk and Isochronous endpoints of the USB Device Controller are double buffered to
increase data throughput.
When a double-buffered endpoint is realized, enough space for both endpoint buffers is
For the following discussion, the endpoint buffer currently accessible to the CPU or DMA
engine for reading or writing is said to be the active buffer.
15.1 Bulk endpoints
For Bulk endpoints, the active endpoint buffer is switched by the SIE Clear Buffer or
Validate Buffer commands.
The following example illustrates how double buffering works for a Bulk OUT endpoint in
Slave mode:
Assume that both buffer 1 (B_1) and buffer 2 (B_2) are empty, and that the active buffer is
B_1.
1. The host sends a data packet to the endpoint. The device hardware puts the packet
into B_1, and generates an endpoint interrupt.
2. Software clears the endpoint interrupt and begins reading the packet data from B_1.
While B_1 is still being read, the host sends a second packet, which device hardware
places in B_2, and generates an endpoint interrupt.
3. Software is still reading from B_1 when the host attempts to send a third packet.
Since both B_1 and B_2 are full, the device hardware responds with a NAK.
4. Software finishes reading the first packet from B_1 and sends a SIE Clear Buffer
command to free B_1 to receive another packet. B_2 becomes the active buffer.
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Chapter 13: LPC24XX USB device controller
5. Software sends the SIE Select Endpoint command to read the Select Endpoint
Register and test the FE bit. Software finds that the active buffer (B_2) has data
(FE=1). Software clears the endpoint interrupt and begins reading the contents of
B_2.
6. The host resends the third packet which device hardware places in B_1. An endpoint
interrupt is generated.
7. Software finishes reading the second packet from B_2 and sends a SIE Clear Buffer
command to free B_2 to receive another packet. B_1 becomes the active buffer.
Software waits for the next endpoint interrupt to occur (it already has been generated
back in step 6).
8. Software responds to the endpoint interrupt by clearing it and begins reading the third
packet from B_1.
9. Software finishes reading the third packet from B_1 and sends a SIE Clear Buffer
command to free B_1 to receive another packet. B_2 becomes the active buffer.
10. Software tests the FE bit and finds that the active buffer (B_2) is empty (FE=0).
11. Both B_1 and B_2 are empty. Software waits for the next endpoint interrupt to occur.
The active buffer is now B_2. The next data packet sent by the host will be placed in
B_2.
The following example illustrates how double buffering works for a Bulk IN endpoint in
Slave mode:
Assume that both buffer 1 (B_1) and buffer 2 (B_2) are empty and that the active buffer is
B_1. The interrupt on NAK feature is enabled.
1. The host requests a data packet by sending an IN token packet. The device responds
with a NAK and generates an endpoint interrupt.
2. Software clears the endpoint interrupt. The device has three packets to send.
Software fills B_1 with the first packet and sends a SIE Validate Buffer command. The
active buffer is switched to B_2.
3. Software sends the SIE Select Endpoint command to read the Select Endpoint
Register and test the FE bit. It finds that B_2 is empty (FE=0) and fills B_2 with the
second packet. Software sends a SIE Validate Buffer command, and the active buffer
is switched to B_1.
4. Software waits for the endpoint interrupt to occur.
5. The device successfully sends the packet in B_1 and clears the buffer. An endpoint
interrupt occurs.
6. Software clears the endpoint interrupt. Software fills B_1 with the third packet and
validates it using the SIE Validate Buffer command. The active buffer is switched to
B_2.
7. The device successfully sends the second packet from B_2 and generates an
endpoint interrupt.
8. Software has no more packets to send, so it simply clears the interrupt.
9. The device successfully sends the third packet from B_1 and generates an endpoint
interrupt.
10. Software has no more packets to send, so it simply clears the interrupt.
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Chapter 13: LPC24XX USB device controller
11. Both B_1 and B_2 are empty, and the active buffer is B_2. The next packet written by
software will go into B_2.
In DMA mode, switching of the active buffer is handled automatically in hardware. For
Bulk IN endpoints, proactively filling an endpoint buffer to take advantage of the double
buffering can be accomplished by manually starting a packet transfer using the
USBDMARSet register.
15.2 Isochronous endpoints
For isochronous endpoints, the active data buffer is switched by hardware when the
FRAME interrupt occurs. The SIE Clear Buffer and Validate Buffer commands do not
cause the active buffer to be switched.
Double buffering allows the software to make full use of the frame interval writing or
reading a packet to or from the active buffer, while the packet in the other buffer is being
sent or received on the bus.
For an OUT isochronous endpoint, any data not read from the active buffer before the end
of the frame is lost when it switches.
For an IN isochronous endpoint, if the active buffer is not validated before the end of the
frame, an empty packet is sent on the bus when the active buffer is switched, and its
contents will be overwritten when it becomes active again.
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Chapter 14: LPC24XX USB Host controller
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1. Basic configuration
The USB controller is configured using the following registers:
Remark: On reset, the USB block is disabled (PCUSB = 0).
3. Pins: Select USB pins and their modes in PINSEL0 to PINSEL5 and PINMODE0 to
port to wakeup the microcontroller from Power-down mode.
5. Interrupts: Interrupts are enabled in the VIC using the VICIntEnable register
2. Introduction
This section describes the host portion of the USB 2.0 OTG dual role core which
integrates the host controller (OHCI compliant), device controller and I2C. The I2C
interface controls the external OTG ATX.
The USB is a 4 wire bus that supports communication between a host and a number (127
max.) of peripherals. The host controller allocates the USB bandwidth to attached devices
through a token based protocol. The bus supports hot plugging, un-plugging and dynamic
configuration of the devices. All transactions are initiated by the host controller.
The host controller enables data exchange with various USB devices attached to the bus.
It consists of register interface, serial interface engine and DMA controller. The register
interface complies to the OHCI specification.
Table 358. USB (OHCI) related acronyms and abbreviations used in this chapter
Acronym/abbreviation
Description
AHB
ATX
DMA
FS
Advanced High-Performance Bus
Analog Transceiver
Direct Memory Access
Full Speed
LS
Low Speed
OHCI
USB
Open Host Controller Interface
Universal Serial Bus
2.1 Features
• OHCI compliant.
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Chapter 14: LPC24XX USB Host controller
• OpenHCI specifies the operation and interface of the USB Host Controller and SW
Driver
– USBOperational: Process Lists and generate SOF Tokens.
– USBReset: Forces reset signaling on the bus, SOF disabled.
– USBSuspend: Monitor USB for wakeup activity.
– USBResume: Forces resume signaling on the bus.
• The Host Controller has four USB states visible to the SW Driver.
• HCCA register points to Interrupt and Isochronous Descriptors List.
• ControlHeadED and BulkHeadED registers point to Control and Bulk Descriptors List.
2.2 Architecture
register
interface
(AHB slave)
REGISTER
INTERFACE
U1
port
USB
ATX
ATX
CONTROL
LOGIC/
PORT
port 1
port 2
HOST
CONTROLLER
DMA interface
(AHB master)
BUS
MUX
MASTER
INTERFACE
USB
ATX
U2
port
USB HOST BLOCK
Fig 51. USB Host controller block diagram
3. Interfaces
The OTG controller has two USB ports indicated by suffixes 1 and 2 in the USB pin names
and referred to as USB port 1 (U1) and USB port 2 (U2) in the following text.
3.1 Pin description
Table 359. USB OTG port pins
Pin name
Direction
Description
Pin category
VBUS
I
VBUS status input. When this function is not enabled USB Connector
via its corresponding PINSEL register, it is driven
HIGH internally.
Port U1
USB_D+1
I/O
I/O
O
Positive differential data
Negative differential data
SoftConnect control signal
GoodLink LED control signal
USB Connector
USB Connector
Control
USB_D−1
USB_CONNECT1
USB_UP_LED1
O
Control
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Chapter 14: LPC24XX USB Host controller
Table 359. USB OTG port pins
Pin name
Direction
Description
Pin category
USB_INT1
I
OTG ATX interrupt
I2C serial clock
I2C serial data
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
USB_SCL1
I/O
I/O
O
O
O
I
USB_SDA1
USB_TX_E1
USB_TX_DP1
USB_TX_DM1
USB_RCV1
Transmit enable
D+ transmit data
D− transmit data
Differential receive data
D+ receive data
D− receive data
USB_RX_DP1
USB_RX_DM1
USB_LS1
I
I
O
O
O
I
Low speed status (applies to host functionality only) External OTG transceiver
USB_SSPND1
USB_PPWR1
USB_PWRD1
USB_OVRCR1
USB_HSTEN1
Port U2
Bus suspend status
Port power enable
Port power status
Over-current status
Host enabled status
External OTG transceiver
Host power switch
Host power switch
Host power switch
I
O
USB_D+2
I/O
I/O
O
O
O
I
Positive differential data
Negative differential data
SoftConnect control signal
GoodLink LED control signal
Port power enable
USB Connector
USB Connector
Control
USB_D−2
USB_CONNECT2
USB_UP_LED2
USB_PPWR2
U2PWRD2
Control
Host power switch
Host power switch
Host power switch
Control
Port power status
USB_OVRCR2
USB_HSTEN2
I
Over-current status
O
Host enabled status
3.1.1 USB host usage note
Both ports can be configured as USB hosts. For details on how to connect the USB ports,
The USB device/host/OTG controller is disabled after RESET and must be enabled by
3.2 Software interface
The software interface of the USB host block consists of a register view and the format
definitions for the endpoint descriptors. For details on these two aspects see the OHCI
specification. The register map is shown in the next subsection.
3.2.1 Register map
The following registers are located in the AHB clock ‘cclk’ domain. They can be accessed
directly by the processor. All registers are 32 bit wide and aligned in the word address
boundaries.
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Chapter 14: LPC24XX USB Host controller
Table 360. USB Host register address definitions
Name
Address
Reset value
HcRevision
0xFFE0 C000
R
BCD representation of the version of the HCI
0x10
specification that is implemented by the Host Controller.
HcControl
0xFFE0 C004 R/W
0xFFE0 C008 R/W
Defines the operating modes of the HC.
0x0
HcCommandStatus
This register is used to receive the commands from the 0x0
Host Controller Driver (HCD). It also indicates the status
of the HC.
HcInterruptStatus
HcInterruptEnable
0xFFE0 C00C R/W
0xFFE0 C010 R/W
Indicates the status on various events that cause
hardware interrupts by setting the appropriate bits.
0x0
Controls the bits in the HcInterruptStatus register and
indicates which events will generate a hardware
interrupt.
0x0
HcInterruptDisable
0xFFE0 C014 R/W
0xFFE0 C018 R/W
The bits in this register are used to disable
corresponding bits in the HCInterruptStatus register and
in turn disable that event leading to hardware interrupt.
0x0
0x0
HcHCCA
Contains the physical address of the host controller
communication area.
HcPeriodCurrentED
HcControlHeadED
HcControlCurrentED
HcBulkHeadED
HcBulkCurrentED
HcDoneHead
0xFFE0 C01C
R
Contains the physical address of the current isochronous 0x0
or interrupt endpoint descriptor.
0xFFE0 C020 R/W
0xFFE0 C024 R/W
0xFFE0 C028 R/W
0xFFE0 C02C R/W
Contains the physical address of the first endpoint
descriptor of the control list.
0x0
0x0
0x0
0x0
0x0
Contains the physical address of the current endpoint
descriptor of the control list
Contains the physical address of the first endpoint
descriptor of the bulk list.
Contains the physical address of the current endpoint
descriptor of the bulk list.
0xFFE0 C030
R
Contains the physical address of the last transfer
descriptor added to the ‘Done’ queue.
HcFmInterval
0xFFE0 C034 R/W
Defines the bit time interval in a frame and the full speed 0x2EDF
maximum packet size which would not cause an
overrun.
HcFmRemaining
HcFmNumber
0xFFE0 C038
0xFFE0 C03C
R
R
A 14-bit counter showing the bit time remaining in the
current frame.
0x0
Contains a 16-bit counter and provides the timing
reference among events happening in the HC and the
HCD.
0x0
HcPeriodicStart
HcLSThreshold
0xFFE0 C040 R/W
0xFFE0 C044 R/W
Contains a programmable 14-bit value which determines 0x0
the earliest time HC should start processing a periodic
list.
Contains 11-bit value which is used by the HC to
determine whether to commit to transfer a maximum of
8-byte LS packet before EOF.
0x628h
HcRhDescriptorA
HcRhDescriptorB
0xFFE0 C048 R/W
0xFFE0 C04C R/W
First of the two registers which describes the
characteristics of the root hub.
0xFF000902
0x60000h
Second of the two registers which describes the
characteristics of the Root Hub.
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Chapter 14: LPC24XX USB Host controller
Table 360. USB Host register address definitions …continued
Name
Address
R/W[1] Function
Reset value
HcRhStatus
0xFFE0 C050 R/W
This register is divided into two parts. The lower D-word 0x0
represents the hub status field and the upper word
represents the hub status change field.
HcRhPortStatus[1]
HcRhPortStatus[2]
0xFFE0 C054 R/W
0xFFE0 C058 R/W
Controls and reports the port events on a per-port basis. 0x0
Controls and reports the port events on a per port basis. 0x0
Module_ID/Ver_Rev_ID 0xFFE0 C0FC
R
IP number, where yy (0x00) is unique version number
and zz (0x00) is a unique revision number.
0x3505yyzz
a) Registers marked ‘R’ for access will return their current value when read.
b) Registers marked ‘R/W’ allow both read and write.
3.2.2 USB Host Register Definitions
Refer to the OHCI specification document for register definitions.
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Chapter 15: LPC24XX USB OTG controller
Rev. 02 — 19 December 2008
User manual
1. Basic configuration
The USB controller is configured using the following registers:
Remark: On reset, the USB block is disabled (PCUSB = 0).
3. Pins: Select USB pins and their modes in PINSEL0 to PINSEL5 and PINMODE0 to
2. Introduction
This chapter describes the OTG and I2C portions of the USB 2.0 OTG dual role device
controller which integrates the (OHCI) host controller, device controller, and I2C. The I2C
interface (Master only) controls an external OTG transceiver.
USB OTG (On-The-Go) is a supplement to the USB 2.0 specification that augments the
capability of existing mobile devices and USB peripherals by adding host functionality for
connection to USB peripherals. The specification and more information on USB OTG can
be found on the USB Implementers Forum web site.
3. Features
• Fully compliant with On-The-Go supplement to the USB 2.0 Specification, Revision
1.0a.
• Hardware support for Host Negotiation Protocol (HNP).
• Includes a programmable timer required for HNP and SRP.
• Supports any OTG transceiver compliant with the OTG Transceiver Specification
(CEA-2011), Rev. 1.0.
4. Architecture
The architecture of the USB OTG controller is shown below in the block diagram.
The host, device, OTG, and I2C controllers can be programmed through the register
interface. The OTG controller enables dynamic switching between host and device roles
through the HNP protocol. One port may be connected to an external OTG transceiver to
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Chapter 15: LPC24XX USB OTG controller
support an OTG connection. The communication between the register interface and an
external OTG transceiver is handled through an I2C interface and through the external
OTG transceiver interrupt signal.
For USB connections that use the device or host controller only (not OTG), the ports use
an embedded USB Analog Transceiver (ATX).
OTG
TRANSCEIVER
register
interface
I2C
CONTROLLER
(AHB slave)
REGISTER
INTERFACE
U1
port
OTG
CONTROLLER
USB
ATX
ATX
CONTROL
LOGIC/
PORT
port 1
DEVICE
CONTROLLER
DMA interface
(AHB master)
BUS
MASTER
INTERFACE
MUX
USB
ATX
port 1
port 2
HOST
CONTROLLER
U2
port
USB OTG BLOCK
EP_RAM
Fig 52. USB OTG controller block diagram
5. Modes of operation
The OTG controller is capable of operating in the following modes:
6. Pin configuration
The OTG controller has two USB ports indicated by suffixes 1 and 2 in the USB pin names
and referred to as USB port 1 (U1) and USB port 2 (U2) in the following text.
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Chapter 15: LPC24XX USB OTG controller
Table 361. USB OTG port 1 pins
Pin name
Direction
Description
Pin category
VBUS
I
VBUS status input. When this function is not enabled USB Connector
via its corresponding PINSEL register, it is driven
HIGH internally.
Port U1
USB_D+1
I/O
I/O
O
O
I
Positive differential data
Negative differential data
SoftConnect control signal
GoodLink LED control signal
OTG ATX interrupt
I2C serial clock
USB Connector
USB_D−1
USB Connector
USB_CONNECT1
USB_UP_LED1
USB_INT1
Control
Control
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
External OTG transceiver
USB_SCL1
I/O
I/O
O
O
O
I
USB_SDA1
I2C serial data
USB_TX_E1
USB_TX_DP1
USB_TX_DM1
USB_RCV1
Transmit enable
D+ transmit data
D− transmit data
Differential receive data
D+ receive data
USB_RX_DP1
USB_RX_DM1
USB_LS1
I
I
D− receive data
O
O
O
I
Low speed status (applies to host functionality only) External OTG transceiver
USB_SSPND1
USB_PPWR1
USB_PWRD1
USB_OVRCR1
USB_HSTEN1
Port U2
Bus suspend status
Port power enable
Port power status
Over-current status
Host enabled status
External OTG transceiver
Host power switch
Host power switch
Host power switch
I
O
USB_D+2
I/O
I/O
O
O
O
I
Positive differential data
Negative differential data
SoftConnect control signal
GoodLink LED control signal
Port power enable
USB Connector
USB Connector
Control
USB_D−2
USB_CONNECT2
USB_UP_LED2
USB_PPWR2
USB_PWRD2
USB_OVRCR2
USB_HSTEN2
Control
Host power switch
Host power switch
Host power switch
Control
Port power status
I
Over-current status
O
Host enabled status
The following figures show different ways to realize connections to an USB device using
ports U1 and U2. The example described here uses an ISP1301 (NXP) for the external
OTG transceiver and the USB Host power switch LM3526-L (National Semiconductors).
6.1 Connecting port U1 to an external OTG transceiver
For OTG functionality an external OTG transceiver must be connected to the LPC2400
device. There are two ways to connect the OTG transceiver (here ISP1301) to port U1:
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Chapter 15: LPC24XX USB OTG controller
1. Use the internal USB transceiver for USB signalling and use the external OTG
internal transceiver in VP/VM mode.
2. Use the external OTG transceiver in VP/VM mode for OTG functionality and USB
In both cases port U2 is connected as a host. Solution one uses fewer pins.
V
DD
R1
R2
R3
R4
VBUS
ID
RSTOUT
RESET_N
ADR/PSW
OE_N/INT_N
SPEED
33 Ω
Mini-AB
DP
V
DD
connector
33 Ω
DM
ISP1301
SUSPEND
R4
R5
R6
V
SS
SCL
SDA
USB_SCL1
USB_SDA1
USB_INT1
INT_N
USB_D+1
USB_D−1
V
DD
USB_UP_LED1
R7
LPC24XX
5 V
V
DD
IN
OUTA
FLAGA
LM3526-L
USB_PPWR2
USB_OVRCR2
ENA
V
USB_PWRD2
USB_D+2
BUS
33 Ω
D+
USB-A
connector
33 Ω
D−
USB_D−2
V
SS
15
15
kΩ
kΩ
V
DD
USB_UP_LED2
R8
002aac708
Fig 53. USB OTG port configuration: port U1 OTG Dual-Role device, port U2 host
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Chapter 15: LPC24XX USB OTG controller
V
DD
RSTOUT
RESET_N
OE_N/INT_N
DAT_VP
USB_TX_E1
USB_TX_DP1
USB_TX_DM1
SE0_VM
RCV
VP
USB_RCV1
USB_RX_DP1
USB_RX_DM1
VBUS
ID
VM
USB MINI-AB
connector
V
DD
33 Ω
DP
ISP1301
33 Ω
DM
LPC24XX
V
SS
ADR/PSW
SPEED
SUSPEND
USB_SCL1
USB_SDA1
USB_INT1
SCL
SDA
INT_N
V
DD
USB_UP_LED1
002aac711
Fig 54. USB OTG port configuration: VP_VM mode
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Chapter 15: LPC24XX USB OTG controller
6.2 Connecting USB as a two-port host
Both ports U1 and U2 are connected as hosts using an embedded USB transceiver. There
is no OTG functionality on either port.
V
DD
USB_UP_LED1
33 Ω
D+
USB_D+1
33 Ω
USB_D−1
D−
USB-A
connector
15
kΩ
15
kΩ
V
DD
V
USB_PWRD1
USB_OVRCR1
BUS
V
SS
USB_PPWR1
FLAGA
OUTA
ENA
5 V
V
DD
IN
LM3526-L
OUTB
LPC24XX
USB_PPWR2
ENB
FLAGB
USB_OVRCR2
USB_PWRD2
V
BUS
USB-A
connector
33 Ω
USB_D+2
D+
33 Ω
D−
USB_D−2
V
SS
15
15
kΩ
kΩ
V
DD
USB_UP_LED2
002aac709
Fig 55. USB OTG port configuration: port U2 host, port U1 host
6.3 Connecting USB as one port host and one port device
Port U2 is connected as device, and port U1 is connected as host using an embedded
USB transceiver. There is no OTG functionality on either port.
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Chapter 15: LPC24XX USB OTG controller
V
DD
USB_UP_LED1
33 Ω
33 Ω
D+
USB_D+1
USB_D−1
D−
15
kΩ
15
kΩ
USB-A
connector
V
DD
V
USB_PWRD1
USB_OVRCR1
BUS
V
SS
USB_PPWR1
FLAGA
OUTA
ENA
IN
5 V
LM3526-L
LPC24XX
V
DD
USB_UP_LED2
V
DD
USB_CONNECT2
33 Ω
33 Ω
USB_D+2
D+
D−
USB_D−2
USB-B
connector
V
BUS
V
BUS
V
SS
002aac710
Fig 56. USB OTG port configuration: port U1 host, port U2 device
7. Register description
The OTG and I2C registers are summarized in the following table.
USB Device Controller and USB Host (OHCI) Controller chapters. All registers are 32 bits
wide and aligned to word address boundaries.
Table 362. USB OTG and I2C register address definitions
Name
Address
Access Function
Interrupt register
USBIntSt
0xE01F C1C0 R/W
USB Interrupt Status
OTG registers
OTGIntSt
0xFFE0 C100 RO
0xFFE0 C104 R/W
OTG Interrupt Status
OTG Interrupt Enable
OTGIntEn
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Chapter 15: LPC24XX USB OTG controller
Table 362. USB OTG and I2C register address definitions
Name
Address
Access Function
OTGIntSet
OTGIntClr
OTGStCtrl[1]
OTGTmr
0xFFE0 C108 WO
0xFFE0 C10C WO
0xFFE0 C110 R/W
0xFFE0 C114 R/W
OTG Interrupt Set
OTG Interrupt Clear
OTG Status and Control
OTG Timer
I2C registers
I2C_RX
0xFFE0 C300 RO
0xFFE0 C300 WO
0xFFE0 C304 RO
0xFFE0 C308 R/W
0xFFE0 C30C R/W
0xFFE0 C310 WO
I2C Receive
I2C Transmit
I2C Status
I2C_TX
I2C_STS
I2C_CTL
I2C_CLKHI
I2C_CLKLO
I2C Control
I2C Clock High
I2C Clock Low
Clock control registers
OTGClkCtrl
OTGClkSt
0xFFE0 CFF4 R/W
0xFFE0 CFF8 RO
OTG clock controller
OTG clock status
[1] Bits 0 and 1 of this register are used to control the routing of the USB pins to ports 1 and 2 in device-only
7.1 USB Interrupt Status Register (USBIntSt - 0xE01F C1C0)
The USB OTG controller has seven interrupt lines. This register allows software to
determine their status with a single read operation.
The interrupt lines are ORed together to a single channel of the vectored interrupt
controller.
Table 363. USB Interrupt Status register - (USBIntSt - address 0xE01F C1) bit description
Bit
Symbol
Description
Reset
Value
0
1
2
3
4
5
6
7
USB_INT_REQ_LP
USB_INT_REQ_HP
USB_INT_REQ_DMA
USB_HOST_INT
USB_ATX_INT
USB_OTG_INT
USB_I2C_INT
-
Low priority interrupt line status. This bit is read only.
High priority interrupt line status. This bit is read only.
DMA interrupt line status. This bit is read only.
USB host interrupt line status. This bit is read only.
External ATX interrupt line status. This bit is read only.
OTG interrupt line status. This bit is read only.
0
0
0
0
0
0
I2C module interrupt line status. This bit is read only.
0
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
8
USB_NEED_CLK
-
USB need clock indicator. This bit is read only.
0
30:9
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
31
EN_USB_INTS
Enable all USB interrupts. When this bit is cleared, the
VIC does not see the ORed output of the USB interrupt
lines.
1
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Chapter 15: LPC24XX USB OTG controller
7.2 OTG Interrupt Status Register (OTGIntSt - 0xE01F C100)
Bits is this register are set by hardware when the interrupt event occurs during the HNP
Table 364. OTG Interrupt Status register (OTGIntSt - address 0xE01F C100) bit description
Bit
Symbol
Description
Reset
Value
0
1
TMR
Timer time-out.
Remove pull-up.
0
0
REMOVE_PU
This bit is set by hardware to indicate that software
needs to disable the D+ pull-up resistor.
2
HNP_FAILURE
HNP failed.
0
This bit is set by hardware to indicate that the HNP
switching has failed.
3
HNP_SUCCESS
-
HNP succeeded.
0
This bit is set by hardware to indicate that the HNP
switching has succeeded.
31:4
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
7.3 OTG Interrupt Enable Register (OTGIntEn - 0xFFE0 C104)
Writing a one to a bit in this register enables the corresponding bit in OTGIntSt to generate
an interrupt on one of the interrupt lines. The interrupt is routed to the USB_OTG_INT
interrupt line in the USBIntSt register.
The bit allocation and reset value of OTGIntEn is the same as OTGIntSt.
7.4 OTG Interrupt Set Register (OTGIntSet - 0xFFE0 C20C)
Writing a one to a bit in this register will set the corresponding bit in the OTGIntSt register.
Writing a zero has no effect. The bit allocation of OTGIntSet is the same as in OTGIntSt.
7.5 OTG Interrupt Clear Register (OTGIntClr - 0xFFE0 C10C)
Writing a one to a bit in this register will clear the corresponding bit in the OTGIntSt
register. Writing a zero has no effect. The bit allocation of OTGIntClr is the same as in
OTGIntSt.
7.6 OTG Status and Control Register (OTGStCtrl - 0xFFE0 C110)
The OTGStCtrl register allows enabling hardware tracking during the HNP hand over
sequence, controlling the OTG timer, monitoring the timer count, and controlling the
functions mapped to port U1 and U2.
Time critical events during the switching sequence are controlled by the OTG timer. The
timer can operate in two modes:
15–7.7 “OTG Timer Register (OTGTmr - 0xFFE0 C114)”), the TMR bit is set in
OTGIntSt, and the timer will be disabled.
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Chapter 15: LPC24XX USB OTG controller
2. Free running mode: an interrupt is generated at the end of TIMEOUT_CNT (see
Section 15–7.7 “OTG Timer Register (OTGTmr - 0xFFE0 C114)”), the TMR bit is set,
and the timer value is reloaded into the counter. The timer is not disabled in this
mode.
Table 365. OTG Status Control register (OTGStCtrl - address 0xFFE0 C110) bit description
Bit
Symbol
Description
Reset
Value
1:0
PORT_FUNC
Controls the function of ports U1 and U2. Bit 0 is set or
cleared by hardware when B_HNP_TRACK or
A_HNP_TRACK is set and HNP succeeds. See
-
3:2
TMR_SCALE
TMR_MODE
Timer scale selection. This field determines the duration 0x0
of each timer count.
00: 10 μs (100 KHz)
01: 100 μs (10 KHz)
10: 1000 μs (1 KHz)
11: Reserved
4
Timer mode selection.
0: monoshot
0
1: free running
5
6
TMR_EN
Timer enable. When set, TMR_CNT increments. When
cleared, TMR_CNT is reset to 0.
0
0
TMR_RST
Timer reset. Writing one to this bit resets TMR_CNT to 0.
This provides a single bit control for the software to
restart the timer when the timer is enabled.
7
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
0
8
B_HNP_TRACK
A_HNP_TRACK
PU_REMOVED
Enable HNP tracking for B-device (peripheral), see
Section 15–8. Hardware clears this bit when
HNP_SUCCESS or HNP_FAILURE is set.
9
Enable HNP tracking for A-device (host), see
Section 15–8. Hardware clears this bit when
HNP_SUCCESS or HNP_FAILURE is set.
0
10
When the B-device changes its role from peripheral to
host, software sets this bit when it removes the D+
HNP_SUCCESS or HNP_FAILURE is set.
0
15:11 -
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
31:16 TMR_CNT
Current timer count value.
0x0
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Chapter 15: LPC24XX USB OTG controller
OTGStCtrl
PORT_FUNC[0] = 0
port1
PORT_FUNC[1] = 0
DEVICE
U1
U2
CONTROLLER
port1
port2
HOST
CONTROLLER
Fig 57. Port selection for PORT_FUNC bit 0 = 0 and PORT_FUNC bit 1 = 0.
Table 366. Port function truth table
PORT_FUNC[0] = 0
U1 = device (OTG)
U2 = host
PORT_FUNC[0] = 1
U1 = host (OTG)
U2 = host
PORT_FUNC[1] = 0
PORT_FUNC[1] = 1
reserved
U1 = host
U2 = device
7.7 OTG Timer Register (OTGTmr - 0xFFE0 C114)
Table 367. OTG Timer register (OTGTmr - address 0xFFE0 C114) bit description
Bit
Symbol
Description
Reset
Value
15:0 TIMEOUT_CNT The TMR interrupt is set when TMR_CNT reaches this value. 0xFFFF
31:16 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
7.8 OTG Clock Control Register (OTGClkCtrl - 0xFFE0 CFF4)
This register controls the clocking of the OTG controller. Whenever software wants to
access the registers, the corresponding clock control bit needs to be set. The software
does not have to repeat this exercise for every register access, provided that the
corresponding OTGClkCtrl bits are already set.
Table 368. OTG_clock_control register (OTG_clock_control - address 0xFFE0 CFF4) bit
description
Bit
Symbol
Value Description
Reset
Value
0
HOST_CLK_EN
Host clock enable
0
0
1
Disable the Host clock.
Enable the Host clock.
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Table 368. OTG_clock_control register (OTG_clock_control - address 0xFFE0 CFF4) bit
description
Bit
Symbol
Value Description
Reset
Value
1
DEV_CLK_EN
Device clock enable
0
0
0
0
0
1
Disable the Device clock.
Enable the Device clock.
I2C clock enable
2
I2C_CLK_EN
OTG_CLK_EN
AHB_CLK_EN
-
2
0
1
Disable the I C clock.
2
Enable the I C clock.
3
OTG clock enable
0
1
Disable the OTG clock.
Enable the OTG clock.
AHB master clock enable
Disable the AHB clock.
Enable the AHB clock.
4
0
1
31:5
NA
Reserved, user software should not write ones NA
to reserved bits. The value read from a
reserved bit is not defined.
7.9 OTG Clock Status Register (OTGClkSt - 0xFFE0 CFF8)
This register holds the clock availability status. When enabling a clock via OTGClkCtrl,
software should poll the corresponding bit in this register. If it is set, then software can go
ahead with the register access. Software does not have to repeat this exercise for every
access, provided that the OTGClkCtrl bits are not disturbed.
Table 369. OTG_clock_status register (OTGClkSt - address 0xFFE0 CFF8) bit description
Bit
Symbol
Value Description
Reset
Value
0
HOST_CLK_ON
Host clock status.
0
0
0
0
0
1
Host clock is not available.
Host clock is available.
Device clock status.
1
2
3
DEV_CLK_ON
I2C_CLK_ON
OTG_CLK_ON
0
1
Device clock is not available.
Device clock is available.
I2C clock status.
0
1
I2C clock is not available.
I2C clock is available.
OTG clock status.
0
1
OTG clock is not available.
OTG clock is available.
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Table 369. OTG_clock_status register (OTGClkSt - address 0xFFE0 CFF8) bit description
Bit
Symbol
Value Description
Reset
Value
4
AHB_CLK_ON
AHB master clock status.
0
0
AHB clock is not available.
AHB clock is available.
1
31:5
-
NA
Reserved, user software should not write ones NA
to reserved bits. The value read from a
reserved bit is not defined.
7.10 I2C Receive Register (I2C_RX - 0xFFE0 C300)
This register is the top byte of the receive FIFO. The receive FIFO is 4 bytes deep. The Rx
FIFO is flushed by a hard reset or by a soft reset (I2C_CTL bit 7). Reading an empty FIFO
gives unpredictable data results.
Table 370. I2C Receive register (I2C_RX - address 0xFFE0 C300) bit description
Bit
Symbol
Description
Reset
Value
7:0
RX Data
Receive data.
-
7.11 I2C Transmit Register (I2C_TX - 0xFFE0 C300)
This register is the top byte of the transmit FIFO. The transmit FIFO is 4 bytes deep.
The Tx FIFO is flushed by a hard reset, soft reset (I2C_CTL bit 7) or if an arbitration failure
occurs (I2C_STS bit 3). Data writes to a full FIFO are ignored.
I2C_TX must be written for both write and read operations to transfer each byte. Bits [7:0]
are ignored for master-receive operations. The master-receiver must write a dummy byte
to the TX FIFO for each byte it expects to receive in the RX FIFO. When the STOP bit is
set or the START bit is set to cause a RESTART condition on a byte written to the TX
FIFO (master-receiver), then the byte read from the slave is not acknowledged. That is,
the last byte of a master-receive operation is not acknowledged.
Table 371. I2C Transmit register (I2C_TX - address 0xFFE0 C300) bit description
Bit
Symbol
Description
Reset
Value
7:0
8
TX Data
START
STOP
-
Transmit data.
-
-
-
-
When 1, issue a START condition before transmitting this byte.
When 1, issue a STOP condition after transmitting this byte.
9
31:10
Reserved. User software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
7.12 I2C Status Register (I2C_STS - 0xFFE0 C304)
The I2C_STS register provides status information on the TX and RX blocks as well as the
current state of the external buses. Individual bits are enabled as interrupts by the
I2C_CTL register and routed to the I2C_USB_INT bit in USBIntSt.
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Table 372. I2C status register (I2C_STS - address 0xFFE0 C304) bit description
Bit
Symbol Value Description
Reset
Value
0
TDI
Transaction Done Interrupt. This flag is set if a transaction
0
completes successfully. It is cleared by writing a one to bit 0 of
the status register. It is unaffected by slave transactions.
0
1
Transaction has not completed.
Transaction completed.
1
AFI
Arbitration Failure Interrupt. When transmitting, if the SDA is low
when SDAOUT is high, then this I C has lost the arbitration to
0
2
another device on the bus. The Arbitration Failure bit is set when
this happens. It is cleared by writing a one to bit 1 of the status
register.
0
1
No arbitration failure on last transmission.
Arbitration failure occurred on last transmission.
2
3
NAI
No Acknowledge Interrupt. After every byte of data is sent, the
transmitter expects an acknowledge from the receiver. This bit is
set if the acknowledge is not received. It is cleared when a byte
is written to the master TX FIFO.
0
0
0
1
Last transmission received an acknowledge.
Last transmission did not receive an acknowledge.
DRMI
Master Data Request Interrupt. Once a transmission is started,
the transmitter must have data to transmit as long as it isn’t
followed by a stop condition or it will hold SCL low until more
data is available. The Master Data Request bit is set when the
master transmitter is data-starved. If the master TX FIFO is
empty and the last byte did not have a STOP condition flag, then
SCL is held low until the CPU writes another byte to transmit.
This bit is cleared when a byte is written to the master TX FIFO.
0
1
Master transmitter does not need data.
Master transmitter needs data.
4
DRSI
Slave Data Request Interrupt. Once a transmission is started,
the transmitter must have data to transmit as long as it isn’t
followed by a STOP condition or it will hold SCL low until more
data is available. The Slave Data Request bit is set when the
slave transmitter is data-starved. If the slave TX FIFO is empty
and the last byte transmitted was acknowledged, then SCL is
held low until the CPU writes another byte to transmit. This bit is
cleared when a byte is written to the slave Tx FIFO.
0
0
1
Slave transmitter does not need data.
Slave transmitter needs data.
5
Active
Indicates whether the bus is busy. This bit is set when a START
condition has been seen. It is cleared when a STOP condition is
seen..
0
6
7
SCL
SDA
The current value of the SCL signal.
The current value of the SDA signal.
-
-
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Chapter 15: LPC24XX USB OTG controller
Table 372. I2C status register (I2C_STS - address 0xFFE0 C304) bit description
Bit
Symbol Value Description
Reset
Value
8
RFF
Receive FIFO Full (RFF). This bit is set when the RX FIFO is full
0
and cannot accept any more data. It is cleared when the RX
FIFO is not full. If a byte arrives when the Receive FIFO is full,
the SCL is held low until the CPU reads the RX FIFO and makes
room for it.
0
1
RX FIFO is not full
RX FIFO is full
9
RFE
TFF
TFE
Receive FIFO Empty. RFE is set when the RX FIFO is empty
and is cleared when the RX FIFO contains valid data.
1
0
1
0
1
RX FIFO contains data.
RX FIFO is empty
10
11
Transmit FIFO Full. TFF is set when the TX FIFO is full and is
cleared when the TX FIFO is not full.
0
1
TX FIFO is not full.
TX FIFO is full
Transmit FIFO Empty. TFE is set when the TX FIFO is empty
and is cleared when the TX FIFO contains valid data.
0
TX FIFO contains valid data.
TX FIFO is empty
1
31:12 -
NA
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
7.13 I2C Control Register (I2C_CTL - 0xFFE0 C308)
The I2C_CTL register is used to enable interrupts and reset the I2C state machine.
Enabled interrupts cause the USB_I2C_INT interrupt output line to be asserted when set.
Table 373. I2C Control register (I2C_CTL - address 0xFFE0 C308) bit description
Bit Symbol Value Description
Reset
Value
2
0
1
TDIE
AFIE
Transmit Done Interrupt Enable. This enables the TDI interrupt signalling that this I C
issued a STOP condition.
0
0
1
Disable the TDI interrupt.
Enable the TDI interrupt.
Transmitter Arbitration Failure Interrupt Enable. This enables the AFI interrupt which is
asserted during transmission when trying to set SDA high, but the bus is driven low by
another device.
0
0
1
Disable the AFI.
Enable the AFI.
2
NAIE
Transmitter No Acknowledge Interrupt Enable. This enables the NAI interrupt signalling
that transmitted byte was not acknowledged.
0
0
1
Disable the NAI.
Enable the NAI.
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Chapter 15: LPC24XX USB OTG controller
Table 373. I2C Control register (I2C_CTL - address 0xFFE0 C308) bit description
Bit Symbol Value Description
Reset
Value
3
DRMIE
Master Transmitter Data Request Interrupt Enable. This enables the DRMI interrupt which
signals that the master transmitter has run out of data, has not issued a STOP, and is
holding the SCL line low.
0
0
1
Disable the DRMI interrupt.
Enable the DRMI interrupt.
4
DRSIE
Slave Transmitter Data Request Interrupt Enable. This enables the DRSI interrupt which
signals that the slave transmitter has run out of data and the last byte was acknowledged,
so the SCL line is being held low.
0
0
1
Disable the DRSI interrupt.
Enable the DRSI interrupt.
5
6
7
REFIE
RFDAIE
TFFIE
Receive FIFO Full Interrupt Enable. This enables the Receive FIFO Full interrupt to
indicate that the receive FIFO cannot accept any more data.
0
0
0
0
1
Disable the RFFI.
Enable the RFFI.
Receive Data Available Interrupt Enable. This enables the DAI interrupt to indicate that
data is available in the receive FIFO (i.e. not empty).
0
1
Disable the DAI.
Enable the DAI.
Transmit FIFO Not Full Interrupt Enable. This enables the Transmit FIFO Not Full interrupt
to indicate that the more data can be written to the transmit FIFO. Note that this is not full.
2
It is intended help the CPU to write to the I C block only when there is room in the FIFO
and do this without polling the status register.
0
1
Disable the TFFI.
Enable the TFFI.
8
SRST
Soft reset. This is only needed in unusual circumstances. If a device issues a start
condition without issuing a stop condition. A system timer may be used to reset the I C if
0
2
the bus remains busy longer than the time-out period. On a soft reset, the Tx and Rx
FIFOs are flushed, I2C_STS register is cleared, and all internal state machines are reset
to appear idle. The I2C_CLKHI, I2C_CLKLO and I2C_CTL (except Soft Reset Bit) are
NOT modified by a soft reset.
0
See the text.
2
1
Reset the I C to idle state. Self clearing.
31:9 -
NA
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
7.14 I2C Clock High Register (I2C_CLKHI - 0xFFE0 C30C)
The CLK register holds a terminal count for counting 48 MHz clock cycles to create the
high period of the slower I2C serial clock, SCL.
Table 374. I2C_CLKHI register (I2C_CLKHI - address 0xFFE0 C30C) bit description
Bit
Symbol
Description
Reset
Value
7:0
CDHI
Clock divisor high. This value is the number of 48 MHz
clocks the serial clock (SCL) will be high.
0xB9
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Chapter 15: LPC24XX USB OTG controller
7.15 I2C Clock Low Register (I2C_CLKLO - 0xFFE0 C310)
The CLK register holds a terminal count for counting 48 MHz clock cycles to create the
low period of the slower I2C serial clock, SCL.
Table 375. I2C_CLKLO register (I2C_CLKLO - address 0xFFE0 C310) bit description
Bit
Symbol
Description
Reset
Value
7:0
CDLO
Clock divisor low. This value is the number of 48 MHz
clocks the serial clock (SCL) will be low.
0xB9
7.16 Interrupt handling
The interrupts set in the OTGIntSt register are set and cleared during HNP switching. All
OTG related interrupts, if enabled, are routed to the USB_OTG_INT bit in the USBIntSt
register.
I2C related interrupts are set in the I2C_STS register and routed, if enabled by I2C_CTL,
to the USB_I2C_INT bit.
For more details on the interrupts created by device controller, see the USB device
chapter. For interrupts created by the host controllers, see the OHCI specification.
The EN_USB_INTS bit in the USBIntSt register enables the routing of any of the USB
Remark: During the HNP switching between host and device with the OTG stack active,
an action may raise several levels of interrupts. It is advised to let the OTG stack initiate
any actions based on interrupts and ignore device and host level interrupts. This means
that during HNP switching, the OTG stack provides the communication to the host and
device controllers.
USBIntSt
USB_INT_REQ_HP
to VIC
channel #22
USB DEVICE
INTERRUPTS
USB_INT_REQ_LP
USB_INT_REQ_DMA
USB_HOST_INT
USB_OTG_INT
USB_I2C_INT
USB HOST
INTERRUPTS
OTGIntSt
TMR
REMOVE_PU
HNP_SUCCESS
HNP_FAILURE
USB_NEED_CLOCK
EN_USB_INTS
USB I2C
INTERRUPTS
Fig 58. USB OTG interrupt handling
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Chapter 15: LPC24XX USB OTG controller
8. HNP support
This section describes the hardware support for the Host Negotiation Protocol (HNP)
provided by the OTG controller.
When two dual-role OTG devices are connected to each other, the plug inserted into the
mini-AB receptacle determines the default role of each device. The device with the mini-A
plug inserted becomes the default Host (A-device), and the device with the mini-B plug
inserted becomes the default Peripheral (B-device).
Once connected, the default Host (A-device) and the default Peripheral (B-device) can
switch Host and Peripheral roles using HNP.
(Host, Device, or OTG) communicates with its software stack through a set of status and
control registers and interrupts. In addition, the OTG software stack communicates with
the external OTG transceiver through the I2C interface and the external transceiver
interrupt signal.
The OTG software stack is responsible for implementing the HNP state machines as
described in the On-The-Go Supplement to the USB 2.0 Specification.
The OTG controller hardware provides support for some of the state transitions in the
HNP state machines as described in the following subsections.
The USB state machines, the HNP switching, and the communications between the USB
controllers are described in more detail in the following documentation:
• USB OHCI specification
• USB OTG supplement, version 1.2
• USB 2.0 specification
• ISP1301 datasheet and usermanual
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Chapter 15: LPC24XX USB OTG controller
OHCI
HOST
STACK
CONTROLLER
USB BUS
OTG
CONTROLLER
MUX
OTG
STACK
DEVICE
CONTROLLER
DEVICE
STACK
I2C
ISP1301
CONTROLLER
Fig 59. USB OTG controller with software stack
8.1 B-device: peripheral to host switching
In this case, the default role of the OTG controller is peripheral (B-device), and it switches
roles from Peripheral to Host.
The On-The-Go Supplement defines the behavior of a dual-role B-device during HNP
using a state machine diagram. The OTG software stack is responsible for implementing
all of the states in the Dual-Role B-Device State Diagram.
The OTG controller hardware provides support for the state transitions between the states
b_peripheral, b_wait_acon, and b_host in the Dual-Role B-Device state diagram. Setting
B_HNP_TRACK in the OTGStCtrl register enables hardware support for the B-device
switching from peripheral to host. The hardware actions after setting this bit are shown in
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Chapter 15: LPC24XX USB OTG controller
idle
B_HNP_TRACK = 0
no
no
B_HNP_TRACK = 1 ?
bus suspended ?
set HNP_FAILURE,
clear B_HNP_TRACK,
clear PU_REMOVED
no
disconnect device controller from U1
set REMOVE_PU
PU_REMOVED set?
yes
PU_REMOVED set?
reconnect port U1 to the
device controller
yes
bus reset/resume detected?
no
reconnect port U1 to the
device controller
wait 25 μs for bus to settle
yes
yes
bus reset/resume detected?
connect from A-device detected?
no
no
set HNP_SUCCESS
set PORT_FUNC[0]
drive J on internal host controller port
and SE0 on U1
yes
connect U1 to host controller
clear B_HNP_TRACK
SE0 sent by host?
no
clear PU_REMOVED
Fig 60. Hardware support for B-device switching from peripheral state to host state
Figure 15–61 shows the actions that the OTG software stack should take in response to
the hardware actions setting REMOVE_PU, HNP_SUCCESS, AND HNP_FAILURE. The
relationship of the software actions to the Dual-Role B-Device states is also shown.
B-device states are in bold font with a circle around them.
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Chapter 15: LPC24XX USB OTG controller
b_peripheral
when host sends SET_FEATURE
with b_hnp_enable,
set B_HNP_TRACK
no
REMOVE_PU set?
yes
remove D+ pull-up,
set PU_REMOVED
go to
go to
b_wait_acon
b_peripheral
yes
HNP_FAILURE set?
no
add D+ pull-up
no
HNP_SUCCESS set?
yes
go to
b_host
Fig 61. State transitions implemented in software during B-device switching from peripheral to host
Note that only the subset of B-device HNP states and state transitions supported by
hardware are shown. Software is responsible for implementing all of the HNP states.
Figure 15–61 may appear to imply that the interrupt bits such as REMOVE_PU should be
polled, but this is not necessary if the corresponding interrupt is enabled.
accomplished. The examples assume that ISP1301 is being used as the external OTG
transceiver.
Remove D+ pull-up
/* Remove D+ pull-up through ISP1301 */
OTG_I2C_TX = 0x15A; // Send ISP1301 address, R/W=0
OTG_I2C_TX = 0x007; // Send OTG Control (Clear) register address
OTG_I2C_TX = 0x201; // Clear DP_PULLUP bit, send STOP condition
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Chapter 15: LPC24XX USB OTG controller
/* Wait for TDI to be set */
while (!(OTG_I2C_STS & TDI));
/* Clear TDI */
OTG_I2C_STS = TDI;
Add D+ pull-up
/* Add D+ pull-up through ISP1301 */
OTG_I2C_TX = 0x15A; // Send ISP1301 address, R/W=0
OTG_I2C_TX = 0x006; // Send OTG Control (Set) register address
OTG_I2C_TX = 0x201; // Set DP_PULLUP bit, send STOP condition
/* Wait for TDI to be set */
while (!(OTG_I2C_STS & TDI));
/* Clear TDI */
OTG_I2C_STS = TDI;
8.2 A-device: host to peripheral HNP switching
In this case, the role of the OTG controller is host (A-device), and the A-device switches
roles from host to peripheral.
The On-The-Go Supplement defines the behavior of a dual-role A-device during HNP
using a state machine diagram. The OTG software stack is responsible for implementing
all of the states in the Dual-Role A-Device State Diagram.
The OTG controller hardware provides support for the state transitions between a_host,
a_suspend, a_wait_vfall, and a_peripheral in the Dual-Role A-Device state diagram.
Setting A_HNP_TRACK in the OTGStCtrl register enables hardware support for switching
the A-device from the host state to the device state. The hardware actions after setting
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idle
A_HNP_TRACK = 0
no
A_HNP_TRACK = 1 ?
set HNP_FAILURE,
clear A_HNP_TRACK
disconnect host controller from U1
no
no
bus suspended ?
yes
resume detected ?
yes
connnect host controller back to U1
yes
yes
bus reset detected?
no
resume detected?
no
no
OTG timer expired?
(TMR =1 )
yes
clear A_HNP_TRACK
set HNP_SUCCESS
connect device to U1 by clearing
PORT_FUNC[0]
Fig 62. Hardware support for A-device switching from host state to peripheral state
Figure 15–63 shows the actions that the OTG software stack should take in response to
the hardware actions setting TMR, HNP_SUCCESS, and HNP_FAILURE. The
relationship of the software actions to the Dual-Role A-Device states is also shown.
A-device states are shown in bold font with a circle around them.
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Chapter 15: LPC24XX USB OTG controller
a_host
when host sends SET_FEATURE
with a_hnp_enable,
set A_HNP_TRACK
set BDIS_ACON_EN
in external OTG transceiver
load and enable OTG timer
suspend host on port 1
go to
a_suspend
no
no
no
TMR set?
HNP_SUCCESS set?
HNP_FAILURE set?
yes
yes
yes
clear BDIS_ACON_EN
bit in external OTG transceiver
stop OTG timer
stop the OTG timer
discharge V
BUS
go to
clear BDIS_ACON_EN
a_peripheral
bit in external OTG transceiver
go to
a_wait_vfall
go to
a_host
Fig 63. State transitions implemented in software during A-device switching from host to peripheral
Note that only the subset of A-device HNP states and state transitions supported by
hardware are shown. Software is responsible for implementing all of the HNP states.
Figure 15–63 may appear to imply that the interrupt bits such as TMR should be polled,
but this is not necessary if the corresponding interrupt is enabled.
accomplished. The examples assume that ISP1301 is being used as the external OTG
transceiver.
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Set BDIS_ACON_EN in external OTG transceiver
/* Set BDIS_ACON_EN in ISP1301 */
OTG_I2C_TX = 0x15A; // Send ISP1301 address, R/W=0
OTG_I2C_TX = 0x004; // Send Mode Control 1 (Set) register address
OTG_I2C_TX = 0x210; // Set BDIS_ACON_EN bit, send STOP condition
/* Wait for TDI to be set */
while (!(OTG_I2C_STS & TDI));
/* Clear TDI */
OTG_I2C_STS = TDI;
Clear BDIS_ACON_EN in external OTG transceiver
/* Set BDIS_ACON_EN in ISP1301 */
OTG_I2C_TX = 0x15A; // Send ISP1301 address, R/W=0
OTG_I2C_TX = 0x005; // Send Mode Control 1 (Clear) register address
OTG_I2C_TX = 0x210; // Clear BDIS_ACON_EN bit, send STOP condition
/* Wait for TDI to be set */
while (!(OTG_I2C_STS & TDI));
/* Clear TDI */
OTG_I2C_STS = TDI;
Discharge VBUS
/* Clear the VBUS_DRV bit in ISP1301 */
OTG_I2C_TX = 0x15A; // Send ISP1301 address, R/W=0
OTG_I2C_TX = 0x007; // Send OTG Control (Clear) register address
OTG_I2C_TX = 0x220; // Clear VBUS_DRV bit, send STOP condition
/* Wait for TDI to be set */
while (!(OTG_I2C_STS & TDI));
/* Clear TDI */
OTG_I2C_STS = TDI;
/* Set the VBUS_DISCHRG bit in ISP1301 */
OTG_I2C_TX = 0x15A; // Send ISP1301 address, R/W=0
OTG_I2C_TX = 0x006; // Send OTG Control (Set) register address
OTG_I2C_TX = 0x240; // Set VBUS_DISCHRG bit, send STOP condition
/* Wait for TDI to be set */
while (!(OTG_I2C_STS & TDI));
/* Clear TDI */
OTG_I2C_STS = TDI;
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Load and enable OTG timer
/* The following assumes that the OTG timer has previously been */
/* configured for a time scale of 1 ms (TMR_SCALE = “10”)
/* and monoshot mode (TMR_MODE = 0)
*/
*/
/* Load the timeout value to implement the a_aidl_bdis_tmr timer */
/* the minimum value is 200 ms */
OTG_TIMER = 200;
/* Enable the timer */
OTG_STAT_CTRL |= TMR_EN;
Stop OTG timer
/* Disable the timer – causes TMR_CNT to be reset to 0 */
OTG_STAT_CTRL &= ~TMR_EN;
/* Clear TMR interrupt */
OTG_INT_CLR = TMR;
Suspend host on port 1
/* Write to PortSuspendStatus bit to suspend host port 1 –
*/
/* this example demonstrates the low-level action software needs to take. */
/* The host stack code where this is done will be somewhat more involved. */
HC_RH_PORT_STAT1 = PSS;
9. Clocking and power management
A clock switch controls each clock with the exception of ahb_slave_clk. When the enable
of the clock switch is asserted, its clock output is turned on and its CLK_ON output is
asserted. The CLK_ON signals are observable in the OTGClkSt register.
To conserve power, the clocks to the Device, Host, OTG, and I2C controllers can be
disabled when not in use by clearing the respective CLK_EN bit in the OTGClkCtrl
register. When the entire USB block is not in use, all of its clocks can be disabled by
clearing the PCUSB bit in the PCONP register.
When software wishes to access registers in one of the controllers, it should first ensure
that the respective controller’s 48 MHz clock is enabled by setting its CLK_EN bit in the
OTGClkCtrl register and then poll the corresponding CLK_ON bit in OTGClkSt until set.
Once set, the controller’s clock will remain enabled until CLK_EN is cleared by software.
Accessing the register of a controller when its 48 MHz clock is not enabled will result in a
data abort exception.
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Chapter 15: LPC24XX USB OTG controller
ahb_slave_clk
cclk
PCUSB
REGISTER
INTERFACE
ahb_master_clk
AHB_CLK_ON
CLOCK
SWITCH
EN
ahb_need_clk
AHB_CLK_EN
CLOCK
SWITCH
EN
dev_dma_need_clk
dev_need_clk
DEVICE
CONTROLLER
USB CLOCK
DIVIDER
usbclk
(48 MHz)
DEV_CLK_ON
DEV_CLK_EN
CLOCK
SWITCH
EN
host_dma_need_clk
host_need_clk
HOST
CONTROLLER
HOST_CLK_ON
HOST_CLK_EN
CLOCK
SWITCH
OTG
CONTROLLER
USB_NEED_CLK
EN
OTG_CLK_ON
OTG_CLK_EN
CLOCK
SWITCH
EN
I2C
CONTROLLER
I2C_CLK_ON
I2C_CLK_EN
Fig 64. Clocking and power control
9.1 Device clock request signals
The Device controller has two clock request signals, dev_need_clk and
dev_dma_need_clk. When asserted, these signals turn on the device’s 48 MHz clock and
ahb_master_clk respectively.
The dev_need_clk signal is asserted while the device is not in the suspend state, or if the
device is in the suspend state and activity is detected on the USB bus. The dev_need_clk
signal is de-asserted if a disconnect is detected (CON bit is cleared in the SIE Get Device
normal operation when software does not need to access the Device controller registers –
the Device will continue to function normally and automatically shut off its clock when it is
suspended or disconnected.
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The dev_dma_need_clk signal is asserted on any Device controller DMA access to
memory. Once asserted, it remains active for 2 ms (2 frames), to help assure that DMA
throughput is not affected by any latency associated with re-enabling ahb_master_clk.
2 ms after the last DMA access, dev_dma_need_clk is de-asserted to help conserve
power. This signal allows AHB_CLK_EN to be cleared during normal operation.
9.1.1 Host clock request signals
The Host controller has two clock request signals, host_need_clk and
host_dma_need_clk. When asserted, these signals turn on the host’s 48 MHz clock and
ahb_master_clk respectively.
The host_need_clk signal is asserted while the Host controller functional state is not
UsbSuspend, or if the functional state is UsbSuspend and resume signaling or a
disconnect is detected on the USB bus. This signal allows HOST_CLK_EN to be cleared
during normal operation when software does not need to access the Host controller
registers – the Host will continue to function normally and automatically shut off its clock
when it goes into the UsbSuspend state.
The host_dma_need_clk signal is asserted on any Host controller DMA access to
memory. Once asserted, it remains active for 2 ms (2 frames), to help assure that DMA
throughput is not affected by any latency associated with re-enabling ahb_master_clk.
2 ms after the last DMA access, host_dma_need_clk is de-asserted to help conserve
power. This signal allows AHB_CLK_EN to be cleared during normal operation.
9.2 Power-down mode support
The LPC2400 can be configured to wake up from Power Down mode on any USB bus
activity. When the USBWAKE bit is set in the INTWAKE register, the assertion of the
USB_NEED_CLK signal causes the chip to wake up from Power Down.
Before Power Down mode can be entered when USBWAKE is set, USB_NEED_CLK
must be de-asserted. This is accomplished by clearing all of the CLK_EN bits in
OTGClkCtrl and putting the Host controller into the UsbSuspend functional state. If it is
necessary to wait for either of the dma_need_clk signals or the dev_need_clk to be
de-asserted, the status of USB_NEED_CLK can be polled in the USBIntSt register to
determine when they have all been de-asserted.
10. USB OTG controller initialization
The LPC2400 OTG device controller initialization includes the following steps:
1. Enable the device controller by setting the PCUSB bit of PCONP.
2. Configure and enable the PLL and Clock Dividers to provide 48 MHz for usbclk, and
the desired frequency for cclk. For correct operation of synchronization logic in the
device controller, the minimum cclk frequency is 18 MHz. For the procedure for
determining the PLL setting and configuration, see Section 4–3.2.12 “Procedure for
3. Enable the desired controller clocks by setting their respective CLK_EN bits in the
USBClkCtrl register. Poll the corresponding CLK_ON bits in the USBClkSt register
until they are set.
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4. Enable the desired USB pin functions by writing to the corresponding PINSEL
registers.
initialize the device controller.
6. Follow the guidelines given in the OpenHCI specification for initializing the host
controller.
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Chapter 16: LPC24XX Universal Asynchronous
Receiver/Transmitter (UART) 0/2/3
Rev. 02 — 19 December 2008
User manual
1. Basic configuration
The UART0/2/3 peripherals are configured using the following registers:
Remark: On reset, UART0 is enabled (PCUART0 = 1), and UART2/3 are disabled
(PCUART2/3 = 0).
rate. Also, if needed, set the fractional baud rate in the fractional divider register
enable FIFO.
5. Pins: Select UART pins and pin modes in registers PINSELn and PINMODEn (see
Remark: UART receive pins should not have pull-down resistors enabled.
6. Interrupts: To enable UART interrupts set bit DLAB =0 in register U0/2/3LCR
2. Features
• 16 byte Receive and Transmit FIFOs.
• Register locations conform to ‘550 industry standard.
• Receiver FIFO trigger points at 1, 4, 8, and 14 bytes.
• Built-in baud rate generator.
• Fractional divider for baud rate control, autobaud capabilities and mechanism that
enables software flow control implementation.
• In addition, UART3 includes an IrDA mode to support infrared communication.
3. Pin description
Table 376: UART0 Pin description
Pin
Type
Description
RXD0, RXD2, RXD3
TXD0, TXD2, TXD3
Input
Serial Input. Serial receive data.
Serial Output. Serial transmit data.
Output
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
4. Register description
(DLAB) is contained in UnLCR7 and enables access to the Divisor Latches.
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Table 377. UART Register Map
Name
Bit functions and addresses
MSB
Acces Reset UARTn Register
s
value[ Name & Address
LSB
BIT0
1]
BIT7
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
RBR
Receiver Buffer
8 bit Read Data
RO
NA
U0RBR -
(DLAB= Register
0)
0xE000 C000
U2RBR - 0xE007 8000
U3RBR -
0xE007 C000
THR
(DLAB= Holding
0)
Transmit
8 bit Write Data
8 bit Data
WO
R/W
R/W
NA
U0THR - 0xE000 C000
U2THR - 0xE007 8000
U3THR - 0xE007 C000
Register
DLL
(DLAB= LSB
1)
Divisor Latch
0x01
0x00
U0DLL - 0xE000 C000
U2DLL - 0xE007 8000
U3DLL - 0xE007 C000
DLM
Divisor Latch
8 bit Data
U0DLM -
(DLAB= MSB
1)
0xE000 C004
U2DLM - 0xE007 8004
U3DLM -
0xE007 C004
IER
InterruptEnable
Reserved
Enable
Auto- Baud
Time- Out
Interrupt
EnableEnd R/W
of Auto-
Baud
Interrupt
0x00
U0IER - 0xE000 C004
U2IER - 0xE007 8004
U3IER - 0xE007 C004
(DLAB= Register
0)
0
Enable
RX Line
Status
Enable
THRE
Interrupt
Enable RX
Data
Available
Interrupt
Interrupt
IIR
Interrupt ID
Register
Reserved
0
ABTOInt
IIR1
ABEOint RO
IIR0
0x01
0x00
0x00
U0IIR - 0xE000 C008
U2IIR - 0xE007 8008
U3IIR - 0xE007 C008
FIFOs Enabled
RX Trigger
IIR3
IIR2
FCR
LCR
FIFO Control
Register
Reserved
TX FIFO
Reset
RX FIFO
Reset
FIFO
WO
U0FCR - 0xE000 C008
U2FCR - 0xE007 8008
U3FCR - 0xE007 C008
Enable
Line Control
Register
DLAB
Set
Stick
Even
Parity Number
Word Length Select
R/W
U0LCR -
Break
Parity
Parity Enable of Stop
Select Bits
0xE000 C00C
U2LCR - 0xE007 800C
U3LCR -
0xE007 C00C
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Table 377. UART Register Map
Generic Description
Name
Bit functions and addresses
MSB
Acces Reset UARTn Register
s
value[ Name & Address
LSB
1]
LSR
SCR
Line Status
Register
RX
FIFO
Error
TEMT THRE
BI
FE
PE
OE
DR
RO
0x60
0x00
U0LSR - 0xE000 C014
U2LSR - 0xE007 8014
U3LSR - 0xE007 C014
Scratch Pad
Register
8 bit Data
R/W
R/W
U0SCR -
0xE000 C01C
U2SCR -
0xE007 801C
U3SCR -
0xE007 C01C
ACR
Auto-baud
Control
Register
Reserved [31:10]
Reserved [7:3]
ABTO
IntClr
ABEO
IntClr
0x00
U0ACR -
0xE000 C020
U2ACR - 0xE007 8020
U3ACR -
Auto
Reset
Mode
Start
0xE007 C020
ICR
IrDA Control
Register
Reserved
PulseDiv
FixPulse
En
IrDAInv
IrDAEn
R/W
R/W
0
U3ICR - 0xE000 C024
(UART3 only)
FDR
Fractional
Divider Register
MulVal
DivAddVal
0x10
U0FDR - 0xE000 C028
U2FDR - 0xE007 8028
U3FDR - 0xE007 C028
TER
Transmit
Enable Register
TXEN
Reserved
R/W
0x80
U0TER - 0xE000 C030
U2TER - 0xE007 8030
U3TER - 0xE007 C030
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
16.4.1 UARTn Receiver Buffer Register (U0RBR - 0xE000 C000, U2RBR -
0xE007 8000, U3RBR - 0xE007 C000 when DLAB = 0, Read Only)
The UnRBR is the top byte of the UARTn Rx FIFO. The top byte of the Rx FIFO contains
the oldest character received and can be read via the bus interface. The LSB (bit 0)
represents the “oldest” received data bit. If the character received is less than 8 bits, the
unused MSBs are padded with zeroes.
The Divisor Latch Access Bit (DLAB) in LCR must be zero in order to access the UnRBR.
The UnRBR is always Read Only.
Since PE, FE and BI bits correspond to the byte sitting on the top of the RBR FIFO (i.e.
the one that will be read in the next read from the RBR), the right approach for fetching the
valid pair of received byte and its status bits is first to read the content of the U0LSR
register, and then to read a byte from the UnRBR.
Table 378: UARTn Receiver Buffer Register (U0RBR - address 0xE000 C000,
U2RBR - 0xE007 8000, U3RBR - 0E007 C000 when DLAB = 0, Read Only) bit
description
Bit
Symbol
Description
Reset Value
7:0 RBR
The UARTn Receiver Buffer Register contains the oldest
received byte in the UARTn Rx FIFO.
Undefined
4.2 UARTn Transmit Holding Register (U0THR - 0xE000 C000, U2THR -
0xE007 8000, U3THR - 0xE007 C000 when DLAB = 0, Write Only)
The UnTHR is the top byte of the UARTn TX FIFO. The top byte is the newest character in
the TX FIFO and can be written via the bus interface. The LSB represents the first bit to
transmit.
The Divisor Latch Access Bit (DLAB) in UnLCR must be zero in order to access the
UnTHR. The UnTHR is always Write Only.
Table 379: UART0 Transmit Holding Register (U0THR - address 0xE000 C000,
U2THR - 0xE007 8000, U3THR - 0xE007 C000 when DLAB = 0, Write Only) bit
description
Bit
Symbol
Description
Reset Value
7:0 THR
Writing to the UARTn Transmit Holding Register causes the data NA
to be stored in the UARTn transmit FIFO. The byte will be sent
when it reaches the bottom of the FIFO and the transmitter is
available.
4.3 UARTn Divisor Latch LSB Register (U0DLL - 0xE000 C000, U2DLL -
0xE007 8000, U3DLL - 0xE007 C000 when DLAB = 1) and UARTn
Divisor Latch MSB Register (U0DLM - 0xE000 C004, U2DLL -
0xE007 8004, U3DLL - 0xE007 C004 when DLAB = 1)
The UARTn Divisor Latch is part of the UARTn Baud Rate Generator and holds the value
used to divide the APB clock (PCLK) in order to produce the baud rate clock, which must
be 16× the desired baud rate. The UnDLL and UnDLM registers together form a 16 bit
divisor where UnDLL contains the lower 8 bits of the divisor and UnDLM contains the
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higher 8 bits of the divisor. A 0x0000 value is treated like a 0x0001 value as division by
zero is not allowed. The Divisor Latch Access Bit (DLAB) in UnLCR must be one in order
to access the UARTn Divisor Latches.
Table 380: UARTn Divisor Latch LSB Register (U0DLL - address 0xE000 C000,
U2DLL - 0xE007 8000, U3DLL - 0xE007 C000 when DLAB = 1) bit description
Bit
Symbol
Description
Reset Value
7:0 DLLSB
The UARTn Divisor Latch LSB Register, along with the UnDLM 0x01
register, determines the baud rate of the UARTn.
Table 381: UARTn Divisor Latch MSB Register (U0DLM - address 0xE000 C004,
U2DLM - 0xE007 8004, U3DLM - 0xE007 C004 when DLAB = 1) bit description
Bit
Symbol
Description
Reset Value
7:0 DLMSB
The UARTn Divisor Latch MSB Register, along with the U0DLL 0x00
register, determines the baud rate of the UARTn.
4.4 UARTn Interrupt Enable Register (U0IER - 0xE000 C004, U2IER -
0xE007 8004, U3IER - 0xE007 C004 when DLAB = 0)
The UnIER is used to enable the three UARTn interrupt sources.
Table 382: UARTn Interrupt Enable Register (U0IER - address 0xE000 C004,
U2IER - 0xE007 8004, U3IER - 0xE007 C004 when DLAB = 0) bit description
Bit
Symbol
Value Description
Reset
Value
0
RBR
Interrupt
Enable
enables the Receive Data Available interrupt for UARTn. It
also controls the Character Receive Time-out interrupt.
Disable the RDA interrupts.
0
0
0
0
1
Enable the RDA interrupts.
1
2
THRE
Interrupt
Enable
enables the THRE interrupt for UARTn. The status of this
can be read from UnLSR[5].
0
1
Disable the THRE interrupts.
Enable the THRE interrupts.
RX Line
Status
enables the UARTn RX line status interrupts. The status of
this interrupt can be read from UnLSR[4:1].
Interrupt
Enable
0
1
Disable the RX line status interrupts.
Enable the RX line status interrupts.
7:3
8
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
ABEOIntEn
enables the end of auto-baud interrupt.
Disable End of Auto-baud Interrupt.
Enable End of Auto-baud Interrupt.
enables the auto-baud time-out interrupt.
Disable Auto-baud Time-out Interrupt.
Enable Auto-baud Time-out Interrupt.
0
0
1
9
ABTOIntEn
0
0
1
31:10
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
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4.5 UARTn Interrupt Identification Register (U0IIR - 0xE000 C008, U2IIR -
0xE007 8008, U3IIR - 0x7008 C008, Read Only)
The UnIIR provides a status code that denotes the priority and source of a pending
interrupt. The interrupts are frozen during an UnIIR access. If an interrupt occurs during
an UnIIR access, the interrupt is recorded for the next UnIIR access.
Table 383: UARTn Interrupt Identification Register (U0IIR - address 0xE000 C008,
U2IIR - 0x7008 8008, U3IIR - 0x7008 C008, Read Only) bit description
Bit
Symbol
Value Description
Reset
Value
0
IntStatus
Interrupt status. Note that U1IIR[0] is active low. The
1
pending interrupt can be determined by evaluating
UnIIR[3:1].
0
1
At least one interrupt is pending.
No interrupt is pending.
3:1
IntId
Interrupt identification. UnIER[3:1] identifies an interrupt
corresponding to the UARTn Rx FIFO. All other
combinations of UnIER[3:1] not listed above are reserved
(000,100,101,111).
0
011 1 - Receive Line Status (RLS).
010 2a - Receive Data Available (RDA).
110 2b - Character Time-out Indicator (CTI).
001 3 - THRE Interrupt
5:4
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
7:6
8
FIFO Enable
ABEOInt
These bits are equivalent to UnFCR[0].
0
0
End of auto-baud interrupt. True if auto-baud has finished
successfully and interrupt is enabled.
9
ABTOInt
Auto-baud time-out interrupt. True if auto-baud has timed
out and interrupt is enabled.
0
31:10 -
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
Bit UnIIR[9:8] are set by the auto-baud function and signal a time-out or end of auto-baud
condition. The auto-baud interrupt conditions are cleared by setting the corresponding
Clear bits in the Auto-baud Control Register.
If the IntStatus bit is 1 no interrupt is pending and the IntId bits will be zero. If the IntStatus
is 0, a non auto-baud interrupt is pending in which case the IntId bits identify the type of
interrupt handler routine can determine the cause of the interrupt and how to clear the
active interrupt. The UnIIR must be read in order to clear the interrupt prior to exiting the
Interrupt Service Routine.
The UARTn RLS interrupt (UnIIR[3:1] = 011) is the highest priority interrupt and is set
whenever any one of four error conditions occur on the UARTn Rx input: overrun error
(OE), parity error (PE), framing error (FE) and break interrupt (BI). The UARTn Rx error
condition that set the interrupt can be observed via U0LSR[4:1]. The interrupt is cleared
upon an UnLSR read.
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The UARTn RDA interrupt (UnIIR[3:1] = 010) shares the second level priority with the CTI
interrupt (UnIIR[3:1] = 110). The RDA is activated when the UARTn Rx FIFO reaches the
trigger level defined in UnFCR[7:6] and is reset when the UARTn Rx FIFO depth falls
below the trigger level. When the RDA interrupt goes active, the CPU can read a block of
data defined by the trigger level.
The CTI interrupt (UnIIR[3:1] = 110) is a second level interrupt and is set when the UARTn
Rx FIFO contains at least one character and no UARTn Rx FIFO activity has occurred in
3.5 to 4.5 character times. Any UARTn Rx FIFO activity (read or write of UARTn RSR) will
clear the interrupt. This interrupt is intended to flush the UARTn RBR after a message has
been received that is not a multiple of the trigger level size. For example, if a peripheral
wished to send a 105 character message and the trigger level was 10 characters, the
CPU would receive 10 RDA interrupts resulting in the transfer of 100 characters and 1 to 5
CTI interrupts (depending on the service routine) resulting in the transfer of the remaining
5 characters.
Table 384: UARTn Interrupt Handling
U0IIR[3:0] Priority Interrupt Type Interrupt Source
value[1]
Interrupt Reset
0001
0110
-
None
None
-
/ Error
UnLSR Read[2]
0100
Second RX Data
Available
in FIFO (UnFCR0=1)
or UARTn FIFO
drops below
trigger level
1100
Second Character
Time-out
Minimum of one character in the Rx
FIFO and no character input or removed
during a time period depending on how
many characters are in FIFO and what
the trigger level is set at (3.5 to 4.5
character times).
UnRBR Read[3]
indication
The exact time will be:
[(word length) × 7 - 2] × 8 + [(trigger level
- number of characters) × 8 + 1] RCLKs
0010
Third
THRE
THRE[2]
UnIIR Read (if
source of
interrupt) or
THR write[4]
[1] Values "0000", “0011”, “0101”, “0111”, “1000”, “1001”, “1010”, “1011”,”1101”,”1110”,”1111” are reserved.
[4] For details see Section 16–4.5 “UARTn Interrupt Identification Register (U0IIR - 0xE000 C008, U2IIR -
The UARTn THRE interrupt (UnIIR[3:1] = 001) is a third level interrupt and is activated
when the UARTn THR FIFO is empty provided certain initialization conditions have been
met. These initialization conditions are intended to give the UARTn THR FIFO a chance to
fill up with data to eliminate many THRE interrupts from occurring at system start-up. The
initialization conditions implement a one character delay minus the stop bit whenever
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THRE = 1 and there have not been at least two characters in the UnTHR at one time
since the last THRE = 1 event. This delay is provided to give the CPU time to write data to
UnTHR without a THRE interrupt to decode and service. A THRE interrupt is set
immediately if the UARTn THR FIFO has held two or more characters at one time and
currently, the UnTHR is empty. The THRE interrupt is reset when a UnTHR write occurs or
a read of the UnIIR occurs and the THRE is the highest interrupt (UnIIR[3:1] = 001).
4.6 UARTn FIFO Control Register (U0FCR - 0xE000 C008, U2FCR -
0xE007 8008, U3FCR - 0xE007 C008, Write Only)
The UnFCR controls the operation of the UARTn Rx and TX FIFOs.
Table 385: UARTn FIFO Control Register (U0FCR - address 0xE000 C008,
U2FCR - 0xE007 8008, U3FCR - 0xE007 C008, Write Only) bit description
Bit
Symbol
Value
Description
Reset Value
0
FIFO Enable 0
UARTn FIFOs are disabled. Must not be used in the
application.
0
1
Active high enable for both UARTn Rx and TX
FIFOs and UnFCR[7:1] access. This bit must be set
for proper UARTn operation. Any transition on this
bit will automatically clear the UARTn FIFOs.
1
2
RX FIFO
Reset
0
1
No impact on either of UARTn FIFOs.
0
0
Writing a logic 1 to UnFCR[1] will clear all bytes in
UARTn Rx FIFO and reset the pointer logic. This bit
is self-clearing.
TX FIFO
Reset
0
1
No impact on either of UARTn FIFOs.
Writing a logic 1 to UnFCR[2] will clear all bytes in
UARTn TX FIFO and reset the pointer logic. This bit
is self-clearing.
5:3
7:6
-
0
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
NA
0
RX Trigger
Level
These two bits determine how many receiver
UARTn FIFO characters must be written before an
interrupt is activated.
00
01
10
11
Trigger level 0 (1 character or 0x01)
Trigger level 1 (4 characters or 0x04)
Trigger level 2 (8 characters or 0x08)
Trigger level 3 (14 characters or 0x0E)
4.7 UARTn Line Control Register (U0LCR - 0xE000 C00C, U2LCR -
0xE007 800C, U3LCR - 0xE007 C00C)
The UnLCR determines the format of the data character that is to be transmitted or
received.
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Table 386: UARTn Line Control Register (U0LCR - address 0xE000 C00C,
U2LCR - 0xE007 800C, U3LCR - 0xE007 C00C) bit description
Bit Symbol
Value Description
Reset
Value
1:0 Word Length
Select
00
01
10
11
0
5 bit character length
0
6 bit character length
7 bit character length
8 bit character length
2
3
Stop Bit Select
Parity Enable
1 stop bit.
0
0
0
1
2 stop bits (1.5 if UnLCR[1:0]=00).
Disable parity generation and checking.
Enable parity generation and checking.
0
1
5:4 Parity Select
00
Odd parity. Number of 1s in the transmitted character and
the attached parity bit will be odd.
01
Even Parity. Number of 1s in the transmitted character and
the attached parity bit will be even.
10
11
0
Forced "1" stick parity.
Forced "0" stick parity.
Disable break transmission.
6
7
Break Control
0
0
1
Enable break transmission. Output pin UART0 TXD is
forced to logic 0 when UnLCR[6] is active high.
Divisor Latch
Access Bit
(DLAB)
0
1
Disable access to Divisor Latches.
Enable access to Divisor Latches.
4.8 UARTn Line Status Register (U0LSR - 0xE000 C014, U2LSR -
0xE007 8014, U3LSR - 0xE007 C014, Read Only)
The UnLSR is a read-only register that provides status information on the UARTn TX and
RX blocks.
Table 387: UARTn Line Status Register (U0LSR - address 0xE000 C014,
U2LSR - 0xE007 8014, U3LSR - 0xE007 C014, Read Only) bit description
Bit Symbol
Value Description
Reset
Value
0
1
Receiver
Data Ready
(RDR)
UnLSR0 is set when the UnRBR holds an unread character
and is cleared when the UARTn RBR FIFO is empty.
UnRBR is empty.
0
0
1
UnRBR contains valid data.
Overrun Error
(OE)
The overrun error condition is set as soon as it occurs. An
UnLSR read clears UnLSR1. UnLSR1 is set when UARTn
RSR has a new character assembled and the UARTn RBR
FIFO is full. In this case, the UARTn RBR FIFO will not be
overwritten and the character in the UARTn RSR will be lost.
0
0
1
Overrun error status is inactive.
Overrun error status is active.
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 387: UARTn Line Status Register (U0LSR - address 0xE000 C014,
U2LSR - 0xE007 8014, U3LSR - 0xE007 C014, Read Only) bit description
Bit Symbol
Value Description
Reset
Value
2 Parity Error
When the parity bit of a received character is in the wrong
0
(PE)
state, a parity error occurs. An UnLSR read clears UnLSR[2].
Time of parity error detection is dependent on UnFCR[0].
Note: A parity error is associated with the character at the top
of the UARTn RBR FIFO.
0
1
Parity error status is inactive.
Parity error status is active.
3
Framing Error
(FE)
When the stop bit of a received character is a logic 0, a
framing error occurs. An UnLSR read clears UnLSR[3]. The
time of the framing error detection is dependent on UnFCR0.
Upon detection of a framing error, the Rx will attempt to
resynchronize to the data and assume that the bad stop bit is
actually an early start bit. However, it cannot be assumed that
the next received byte will be correct even if there is no
Framing Error.
0
Note: A framing error is associated with the character at the
top of the UARTn RBR FIFO.
0
1
Framing error status is inactive.
Framing error status is active.
4
Break
Interrupt
(BI)
When RXDn is held in the spacing state (all 0’s) for one full
character transmission (start, data, parity, stop), a break
interrupt occurs. Once the break condition has been detected,
the receiver goes idle until RXDn goes to marking state (all
1’s). An UnLSR read clears this status bit. The time of break
detection is dependent on UnFCR[0].
0
Note: The break interrupt is associated with the character at
the top of the UARTn RBR FIFO.
0
1
Break interrupt status is inactive.
Break interrupt status is active.
5
6
Transmitter
Holding
Register
Empty
THRE is set immediately upon detection of an empty UARTn
THR and is cleared on a UnTHR write.
1
1
0
1
UnTHR contains valid data.
UnTHR is empty.
(THRE))
Transmitter
Empty
(TEMT)
TEMT is set when both UnTHR and UnTSR are empty; TEMT
is cleared when either the UnTSR or the UnTHR contain valid
data.
0
1
UnTHR and/or the UnTSR contains valid data.
UnTHR and the UnTSR are empty.
7
Error in RX
FIFO
(RXFE)
UnLSR[7] is set when a character with a Rx error such as
framing error, parity error or break interrupt, is loaded into the
UnRBR. This bit is cleared when the UnLSR register is read
and there are no subsequent errors in the UARTn FIFO.
0
0
1
UnRBR contains no UARTn RX errors or UnFCR[0]=0.
UARTn RBR contains at least one UARTn RX error.
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4.9 UARTn Scratch Pad Register (U0SCR - 0xE000 C01C, U2SCR -
0xE007 801C U3SCR - 0xE007 C01C)
The UnSCR has no effect on the UARTn operation. This register can be written and/or
read at user’s discretion. There is no provision in the interrupt interface that would indicate
to the host that a read or write of the UnSCR has occurred.
Table 388: UARTn Scratch Pad Register (U0SCR - address 0xE000 C01C,
U2SCR - 0xE007 801C, U3SCR - 0xE007 C01C) bit description
Bit Symbol Description
Reset
Value
7:0 Pad A readable, writable byte.
0x00
4.10 UARTn Auto-baud Control Register (U0ACR - 0xE000 C020, U2ACR -
0xE007 8020, U3ACR - 0xE007 C020)
The UARTn Auto-baud Control Register (UnACR) controls the process of measuring the
incoming clock/data rate for the baud rate generation and can be read and written at
user’s discretion.
Table 389: UARTn Auto-baud Control Register (U0ACR - 0xE000 C020, U2ACR - 0xE007 8020,
U3ACR - 0xE007 C020) bit description
Bit
Symbol
Value Description
This bit is automatically cleared after auto-baud
Reset value
0
Start
0
completion.
0
1
Auto-baud stop (auto-baud is not running).
Auto-baud start (auto-baud is running).Auto-baud run
bit. This bit is automatically cleared after auto-baud
completion.
1
2
Mode
Auto-baud mode select bit.
Mode 0.
0
0
1
0
1
Mode 1.
AutoRestart
No restart.
0
0
Restart in case of time-out (counter restarts at next
UART0 Rx falling edge)
7:3
8
-
NA
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
0
0
0
0
ABEOIntClr
ABTOIntClr
End of auto-baud interrupt clear bit (write only
accessible). Writing a 1 will clear the corresponding
interrupt in the UnIIR. Writing a 0 has no impact.
9
Auto-baud time-out interrupt clear bit (write only
accessible). Writing a 1 will clear the corresponding
interrupt in the UnIIR. Writing a 0 has no impact.
31:10 -
NA
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
16.4.10.1 Auto-baud
The UARTn auto-baud function can be used to measure the incoming baud-rate based on
the ”AT" protocol (Hayes command). If enabled the auto-baud feature will measure the bit
time of the receive data stream and set the divisor latch registers UnDLM and UnDLL
accordingly.
Auto-baud is started by setting the UnACR Start bit. Auto-baud can be stopped by clearing
the UnACR Start bit. The Start bit will clear once auto-baud has finished and reading the
bit will return the status of auto-baud (pending/finished).
Two auto-baud measuring modes are available which can be selected by the UnACR
Mode bit. In mode 0 the baud-rate is measured on two subsequent falling edges of the
UARTn Rx pin (the falling edge of the start bit and the falling edge of the least significant
bit). In mode 1 the baud-rate is measured between the falling edge and the subsequent
rising edge of the UARTn Rx pin (the length of the start bit).
The UnACR AutoRestart bit can be used to automatically restart baud-rate measurement
if a time-out occurs (the rate measurement counter overflows). If this bit is set the rate
measurement will restart at the next falling edge of the UARTn Rx pin.
The auto-baud function can generate two interrupts.
• The UnIIR ABTOInt interrupt will get set if the interrupt is enabled (UnIER ABToIntEn
is set and the auto-baud rate measurement counter overflows).
• The UnIIR ABEOInt interrupt will get set if the interrupt is enabled (UnIER ABEOIntEn
is set and the auto-baud has completed successfully).
The auto-baud interrupts have to be cleared by setting the corresponding UnACR
ABTOIntClr and ABEOIntEn bits.
Typically the fractional baud-rate generator is disabled (DIVADDVAL = 0) during
auto-baud. However, if the fractional baud-rate generator is enabled (DIVADDVAL > 0), it
is going to impact the measuring of UARTn Rx pin baud-rate, but the value of the UnFDR
register is not going to be modified after rate measurement. Also, when auto-baud is used,
any write to UnDLM and UnDLL registers should be done before UnACR register write.
The minimum and the maximum baudrates supported by UARTn are function of pclk,
number of data bits, stop bits and parity bits.
(1)
2 × PCLK
PCLK
------------------------
-----------------------------------------------------------------------------------------------------------
= ratemax
ratemin =
≤ UARTn
≤
baudrate
15
16 × (2 + databits + paritybits + stopbits)
16 × 2
16.4.10.2 Auto-baud modes
When the software is expecting an ”AT" command, it configures the UARTn with the
expected character format and sets the UnACR Start bit. The initial values in the divisor
latches UnDLM and UnDLM don‘t care. Because of the ”A" or ”a" ASCII coding
(”A" = 0x41, ”a" = 0x61), the UARTn Rx pin sensed start bit and the LSB of the expected
character are delimited by two falling edges. When the UnACR Start bit is set, the
auto-baud protocol will execute the following phases:
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1. On UnACR Start bit setting, the baud-rate measurement counter is reset and the
UARTn UnRSR is reset. The UnRSR baud rate is switch to the highest rate.
2. A falling edge on UARTn Rx pin triggers the beginning of the start bit. The rate
measuring counter will start counting pclk cycles optionally pre-scaled by the
fractional baud-rate generator.
3. During the receipt of the start bit, 16 pulses are generated on the RSR baud input with
the frequency of the (fractional baud-rate pre-scaled) UARTn input clock,
guaranteeing the start bit is stored in the UnRSR.
4. During the receipt of the start bit (and the character LSB for mode = 0) the rate
counter will continue incrementing with the pre-scaled UARTn input clock (pclk).
5. If Mode = 0 then the rate counter will stop on next falling edge of the UARTn Rx pin. If
Mode = 1 then the rate counter will stop on the next rising edge of the UARTn Rx pin.
6. The rate counter is loaded into UnDLM/UnDLL and the baud-rate will be switched to
normal operation. After setting the UnDLM/UnDLL the end of auto-baud interrupt
UnIIR ABEOInt will be set, if enabled. The UnRSR will now continue receiving the
remaining bits of the ”A/a" character.
'A' (0x41) or 'a' (0x61)
start
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7 parity stop
UARTn RX
start bit
LSB of 'A' or 'a'
U0ACR start
rate counter
16xbaud_rate
16 cycles
16 cycles
a. Mode 0 (start bit and LSB are used for auto-baud)
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
'A' (0x41) or 'a' (0x61)
start
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7 parity stop
UARTn RX
start bit
LSB of 'A' or 'a'
U1ACR start
rate counter
16xbaud_rate
16 cycles
b. Mode 1 (only start bit is used for auto-baud)
Fig 65. Autobaud a) mode 0 and b) mode 1 waveform
4.11 IrDA Control Register for UART3 Only (U3ICR - 0xE007 C024)
The IrDA Control Register enables and configures the IrDA mode for UART3 only. The
value of U3ICR should not be changed while transmitting or receiving data, or data loss or
corruption may occur.
Table 390: IrDA Control Register for UART3 only (U3ICR - address 0xE007 C024) bit
description
Bit
Symbol
Value Description
Reset value
0
IrDAEn
0
IrDA mode on UART3 is disabled, UART3 acts as a
0
standard UART.
1
IrDA mode on UART3 is enabled.
1
IrDAInv
When 1, the serial input is inverted. This has no effect
on the serial output. When 0, the serial input is not
inverted.
0
2
FixPulseEn
PulseDiv
When 1, enabled IrDA fixed pulse width mode.
0
0
5:3
Configures the pulse when FixPulseEn = 1. See text
below for details.
31:6
-
NA
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is
not defined.
0
The PulseDiv bits in U3ICR are used to select the pulse width when the fixed pulse width
mode is used in IrDA mode (IrDAEn = 1 and FixPulseEn = 1). The value of these bits
possible pulse widths.
Table 391: IrDA Pulse Width
FixPulseEn
PulseDiv
IrDA Transmitter Pulse width (µs)
3 / (16 × baud rate)
2 × TPCLK
0
1
1
x
0
1
4 × TPCLK
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 391: IrDA Pulse Width
FixPulseEn
PulseDiv
IrDA Transmitter Pulse width (µs)
8 × TPCLK
1
1
1
1
1
1
2
3
4
5
6
7
16 × TPCLK
32 × TPCLK
64 × TPCLK
128 × TPCLK
256 × TPCLK
4.12 UARTn Fractional Divider Register (U0FDR - 0xE000 C028, U2FDR -
0xE007 8028, U3FDR - 0xE007 C028)
The UART0/2/3 Fractional Divider Register (U0/2/3FDR) controls the clock pre-scaler for
the baud rate generation and can be read and written at the user’s discretion. This
pre-scaler takes the APB clock and generates an output clock according to the specified
fractional requirements.
Important: If the fractional divider is active (DIVADDVAL > 0) and DLM = 0, the value of
the DLL register must be 3 or greater.
Table 392: UARTn Fractional Divider Register (U0FDR - address 0xE000 C028,
U2FDR - 0xE007 8028, U3FDR - 0xE007 C028) bit description
Bit
Function
Value Description
Reset
value
3:0
DIVADDVAL
0
1
Baud-rate generation pre-scaler divisor value. If this field is
0, fractional baud-rate generator will not impact the UARTn
baudrate.
0
7:4
MULVAL
Baud-rate pre-scaler multiplier value. This field must be
greater or equal 1 for UARTn to operate properly,
regardless of whether the fractional baud-rate generator is
used or not.
1
31:8
-
NA
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
0
This register controls the clock pre-scaler for the baud rate generation. The reset value of
the register keeps the fractional capabilities of UART0/2/3 disabled making sure that
UART0/2/3 is fully software and hardware compatible with UARTs not equipped with this
feature.
UART0/2/3 baudrate can be calculated as (n = 0/2/3):
(2)
PCLK
UARTnbaudrate
=
----------------------------------------------------------------------------------------------------------------------------------
DivAddVal
⎛
⎞
16 × (256 × UnDLM + UnDLL) × 1 +
----------------------------
⎝
⎠
MulVal
Where PCLK is the peripheral clock, U0/2/3DLM and U0/2/3DLL are the standard
UART0/2/3 baud rate divider registers, and DIVADDVAL and MULVAL are UART0/2/3
fractional baudrate generator specific parameters.
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The value of MULVAL and DIVADDVAL should comply to the following conditions:
1. 0 < MULVAL ≤ 15
2. 0 ≤ DIVADDVAL < 15
3. DIVADDVAL<MULVAL
The value of the U0/2/3FDR should not be modified while transmitting/receiving data or
data may be lost or corrupted.
If the U0/2/3FDR register value does not comply to these two requests, then the fractional
divider output is undefined. If DIVADDVAL is zero then the fractional divider is disabled,
and the clock will not be divided.
4.12.1 Baudrate calculation
UART can operate with or without using the Fractional Divider. In real-life applications it is
likely that the desired baudrate can be achieved using several different Fractional Divider
settings. The following algorithm illustrates one way of finding a set of DLM, DLL,
MULVAL, and DIVADDVAL values. Such set of parameters yields a baudrate with a
relative error of less than 1.1% from the desired one.
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
Calculating UART
baudrate (BR)
PCLK,
BR
DL est = PCLK/(16 x BR)
DLest is an
integer?
True
DIVADDVAL = 0
False
MULVAL = 1
FR est = 1.5
Pick another FRest from
the range [1.1, 1.9]
DL est = Int(PCLK/(16 x BR x FR est))
FRest = PCLK/(16 x BR x DL est
)
False
1.1 < FR est < 1.9?
True
DIVADDVAL = table(FR est
)
MULVAL = table(FR
)
est
DLM = DLest [15:8]
DLL = DLest [7:0]
End
Fig 66. Algorithm for setting UART dividers
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 393. Fractional Divider setting look-up table
FR
DivAddVal/ FR
MulVal
DivAddVal/ FR
MulVal
DivAddVal/ FR
MulVal
DivAddVal/
MulVal
1.000
1.067
1.071
1.077
1.083
1.091
1.100
1.111
1.125
1.133
1.143
1.154
1.167
1.182
1.200
1.214
1.222
1.231
0/1
1.250
1/4
1.500
1/2
1.750
3/4
1/15
1/14
1/13
1/12
1/11
1/10
1/9
1.267
1.273
1.286
1.300
1.308
1.333
1.357
1.364
1.375
1.385
1.400
1.417
1.429
1.444
1.455
1.462
1.467
4/15
3/11
2/7
1.533
1.538
1.545
1.556
1.571
1.583
1.600
1.615
1.625
1.636
1.643
1.667
1.692
1.700
1.714
1.727
1.733
8/15
7/13
6/11
5/9
1.769
1.778
1.786
1.800
1.818
1.833
1.846
1.857
1.867
1.875
1.889
1.900
1.909
1.917
1.923
1.929
1.933
10/13
7/9
11/14
4/5
3/10
4/13
1/3
4/7
9/11
5/6
7/12
3/5
5/14
4/11
3/8
11/13
6/7
1/8
8/13
5/8
2/15
1/7
13/15
7/8
5/13
2/5
7/11
9/14
2/3
2/13
1/6
8/9
5/12
3/7
9/10
10/11
11/12
12/13
13/14
14/15
2/11
1/5
9/13
7/10
5/7
4/9
3/14
2/9
5/11
6/13
7/15
8/11
11/15
3/13
4.12.1.1 Example 1: PCLK = 14.7456 MHz, BR = 9600
According to the the provided algorithm DLest = PCLK/(16 x BR) = 14.7456 MHz / (16 x
9600) = 96. Since this DLest is an integer number, DIVADDVAL = 0, MULVAL = 1,
DLM = 0, and DLL = 96.
4.12.1.2 Example 2: PCLK = 12 MHz, BR = 115200
According to the the provided algorithm DLest = PCLK/(16 x BR) = 12 MHz / (16 x 115200)
= 6.51. This DLest is not an integer number and the next step is to estimate the FR
parameter. Using an initial estimate of FRest = 1.5 a new DLest = 4 is calculated and FRest
is recalculated as FRest = 1.628. Since FRest = 1.628 is within the specified range of 1.1
and 1.9, DIVADDVAL and MULVAL values can be obtained from the attached look-up
table.
equivalent to DIVADDVAL = 5 and MULVAL = 8.
Based on these findings, the suggested UART setup would be: DLM = 0, DLL = 4,
rate has a relative error of 0.16% from the originally specified 115200.
4.13 UARTn Transmit Enable Register (U0TER - 0xE000 C030, U2TER -
0xE007 8030, U3TER - 0xE007 C030)
LPC2400’s UnTER enables implementation of software flow control. When TXEn=1,
UARTn transmitter will keep sending data as long as they are available. As soon as TXEn
becomes 0, UARTn transmission will stop.
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 394: UARTn Transmit Enable Register (U0TER - address 0xE000 C030,
U2TER - 0xE007 8030, U3TER - 0xE007 C030) bit description
Bit Symbol Description
Reset
Value
6:0
7
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
TXEN
When this bit is 1, as it is after a Reset, data written to the THR is output
on the TXD pin as soon as any preceding data has been sent. If this bit
is cleared to 0 while a character is being sent, the transmission of that
character is completed, but no further characters are sent until this bit is
set again. In other words, a 0 in this bit blocks the transfer of characters
from the THR or TX FIFO into the transmit shift register. Software
implementing software-handshaking can clear this bit when it receives
an XOFF character (DC3). Software can set this bit again when it
receives an XON (DC1) character.
1
5. Architecture
The architecture of the UARTs 0, 2 and 3 are shown below in the block diagram.
The APB interface provides a communications link between the CPU or host and the
UART.
The UARTn receiver block, UnRX, monitors the serial input line, RXDn, for valid input.
The UARTn RX Shift Register (UnRSR) accepts valid characters via RXDn. After a valid
character is assembled in the UnRSR, it is passed to the UARTn RX Buffer Register FIFO
to await access by the CPU or host via the generic host interface.
The UARTn transmitter block, UnTX, accepts data written by the CPU or host and buffers
the data in the UARTn TX Holding Register FIFO (UnTHR). The UARTn TX Shift Register
(UnTSR) reads the data stored in the UnTHR and assembles the data to transmit via the
serial output pin, TXDn.
The UARTn Baud Rate Generator block, UnBRG, generates the timing enables used by
the UARTn TX block. The UnBRG clock input source is the APB clock (PCLK). The main
clock is divided down per the divisor specified in the UnDLL and UnDLM registers. This
divided down clock is a 16x oversample clock, NBAUDOUT.
The interrupt interface contains registers UnIER and UnIIR. The interrupt interface
receives several one clock wide enables from the UnTX and UnRX blocks.
Status information from the UnTX and UnRX is stored in the UnLSR. Control information
for the UnTX and UnRX is stored in the UnLCR.
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Chapter 16: LPC24XX Universal Asynchronous Receiver/Transmitter
UnTX
NTXRDY
TXDn
UnTHR
UnTSR
UnBRG
UnDLL
UnDLM
NBAUDOUT
RCLK
UnRX
NRXRDY
RXDn
INTERRUPT
UnRBR
UnRSR
UnIER
UnIIR
UnINTR
UnFCR
UnLSR
UnLCR
UnSCR
PA[2:0]
PSEL
PSTB
PWRITE
PD[7:0]
AR
APB
INTERFACE
DDIS
MR
PCLK
Fig 67. UART0, 2 and 3 block diagram
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Chapter 17: LPC24XX Universal Asynchronous
Receiver/Transmitter (UART) 1
Rev. 02 — 19 December 2008
User manual
1. Basic configuration
The UART1 peripheral is configured using the following registers:
Remark: On reset, UART1 is enabled (PCUART1 = 1).
Also, if needed, set the fractional baud rate in the fractional divider register
FIFO.
5. Pins: Select UART pins and pin modes in registers PINSELn and PINMODEn (see
Remark: UART receive pins should not have pull-down resistors enabled.
6. Interrupts: To enable UART interrupts set bit DLAB =0 in register U1LCR
2. Features
• UART1 is identical to UART0/2/3, with the addition of a modem interface.
• 16 byte Receive and Transmit FIFOs.
• Register locations conform to ‘550 industry standard.
• Receiver FIFO trigger points at 1, 4, 8, and 14 bytes.
• Built-in baud rate generator.
• Standard modem interface signals included (CTS, DCD, DTS, DTR, RI, RTS).
• LPC2400 UART1 allows for implementation of either software or hardware flow
control.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
3. Pin description
Table 395: UART1 Pin Description
Pin
Type Description
RXD1 Input
Serial Input. Serial receive data.
TXD1 Output Serial Output. Serial transmit data.
CTS1 Input
Clear To Send. Active low signal indicates if the external modem is ready to
accept transmitted data via TXD1 from the UART1. In normal operation of the
modem interface (U1MCR[4] = 0), the complement value of this signal is stored in
U1MSR[4]. State change information is stored in U1MSR[0] and is a source for a
priority level 4 interrupt, if enabled (U1IER[3] = 1).
Only CTS1 is also used in auto-cts mode to control the UART1 transmitter.
Clear to send. CTS1 is an asynchronous, active low modem status signal. Its
condition can be checked by reading bit 4 (CTS) of the modem status register. Bit
0 (DCTS) of the Modem Status Register (MSR) indicates that CTS1 has changed
states since the last read from the MSR. If the modem status interrupt is enabled
when CTS1 changes levels and the auto-cts mode is not enabled, an interrupt is
generated. CTS1 is also used in the auto-cts mode to control the transmitter.
DCD1 Input
DSR1 Input
Data Carrier Detect. Active low signal indicates if the external modem has
established a communication link with the UART1 and data may be exchanged. In
normal operation of the modem interface (U1MCR[4]=0), the complement value of
this signal is stored in U1MSR[7]. State change information is stored in U1MSR3
and is a source for a priority level 4 interrupt, if enabled (U1IER[3] = 1).
Data Set Ready. Active low signal indicates if the external modem is ready to
establish a communications link with the UART1. In normal operation of the
modem interface (U1MCR[4] = 0), the complement value of this signal is stored in
U1MSR[5]. State change information is stored in U1MSR[1] and is a source for a
priority level 4 interrupt, if enabled (U1IER[3] = 1).
DTR1 Output Data Terminal Ready. Active low signal indicates that the UART1 is ready to
establish connection with external modem. The complement value of this signal is
stored in U1MCR[0].
RI1
Input
Ring Indicator. Active low signal indicates that a telephone ringing signal has
been detected by the modem. In normal operation of the modem interface
(U1MCR[4] = 0), the complement value of this signal is stored in U1MSR[6]. State
change information is stored in U1MSR[2] and is a source for a priority level 4
interrupt, if enabled (U1IER[3] = 1).
RTS1 Output Request To Send. Active low signal indicates that the UART1 would like to
transmit data to the external modem. The complement value of this signal is
stored in U1MCR[1].
Only in the auto-rts mode uses RTS1 to control the transmitter FIFO threshold
logic.
Request to send. RTS1 is an active low signal informing the modem or data set
that the UART is ready to receive data. RTS1 is set to the active (low) level by
setting the RTS modem control register bit and is set to the inactive (high) level
either as a result of a system reset or during loop-back mode operations or by
clearing bit 1 (RTS) of the MCR. In the auto-rts mode, RTS1 is controlled by the
transmitter FIFO threshold logic.
4. Register description
Bit (DLAB) is contained in U1LCR[7] and enables access to the Divisor Latches.
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Table 396: UART1 register map
Name
Description
Bit functions and addresses
MSB
Access Reset
Value[1]
Address
LSB
BIT0
BIT7
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
U1RBR
U1THR
Receiver
Buffer
Register
8 bit Read Data
RO
NA
NA
0xE001 0000
(DLAB=0)
Transmit
Holding
Register
8 bit Write Data
WO
0xE001 0000
(DLAB=0)
U1DLL
U1DLM
U1IER
Divisor Latch
LSB
8 bit Data
8 bit Data
R/W
R/W
R/W
0x01
0x00
0x00
0xE001 0000
(DLAB=1)
Divisor Latch
MSB
0xE001 0004
(DLAB=1)
Interrupt
Enable
Reserved
Enable
Autobaud
Enable
End of
0xE001 0004
(DLAB=0)
Register
Time-Out Autobaud
Interrupt
Interrupt
Enable
CTS
Interrupt
0
Enable
Modem
Status
Enable
RX Line
Status
Enable
THRE
Interrupt
EnableRX
Data
Available
Interrupt
interrupt Interrupt
U1IIR
Interrupt ID
Register
Reserved
0
ABTO Itn ABEO int RO
0x01
0xE001 0008
FIFOs Enabled
RX Trigger
IIR3
IIR2
IIR1
IIR0
U1FCR
U1LCR
FIFO Control
Register
Reserved
TX FIFO RX FIFO
FIFO
WO
0x00
0x00
0xE001 0008
0xE001 000C
Reset
Reset
Enable
Line Control
Register
DLAB
Set Break
Stick
Parity
Even
Parity
Select
Parity
Enable
Number
of Stop
Bits
Word Length Select
R/W
U1MCR
Modem
Control
Register
CTSen
RTSen
0
Loop
Back
0
RTS
OE
DTR
DR
R/W
RO
0x00
0xE001 0010
U1LSR
U1MSR
U1SCR
Line Status
Register
RX FIFO
Error
TEMT
RI
THRE
DSR
BI
FE
PE
0x60
0x00
0x00
0xE001 0014
0xE001 0018
0xE001 001C
ModemStatus
Register
DCD
CTS
Delta
DCD
Trailing Delta DSR Delta CTS RO
Edge RI
Scratch Pad
Register
8 bit Data
R/W
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Table 396: UART1 register map …continued
Name
Description
Bit functions and addresses
MSB
Access Reset
Value[1]
Address
LSB
U1ACR
Autobaud
Control
Reserved [31:10]
ABTO
IntClr
ABEO
IntClr
R/W
0x00
0xE001 0020
Register
Reserved [7:3]
Auto
Mode
Start
Reset
U1FDR
U1TER
Fractional
Divider
Register
Reserved [31:8]
R/W
R/W
0x10
0x80
0xE001 0028
0xE001 0030
Mulval
DivAddVal
Transmit
Enable
TXEN
Reserved
Register
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
4.1 UART1 Receiver Buffer Register (U1RBR - 0xE001 0000, when
DLAB = 0 Read Only)
The U1RBR is the top byte of the UART1 RX FIFO. The top byte of the RX FIFO contains
the oldest character received and can be read via the bus interface. The LSB (bit 0)
represents the “oldest” received data bit. If the character received is less than 8 bits, the
unused MSBs are padded with zeroes.
The Divisor Latch Access Bit (DLAB) in U1LCR must be zero in order to access the
U1RBR. The U1RBR is always Read Only.
Since PE, FE and BI bits correspond to the byte sitting on the top of the RBR FIFO (i.e.
the one that will be read in the next read from the RBR), the right approach for fetching the
valid pair of received byte and its status bits is first to read the content of the U1LSR
register, and then to read a byte from the U1RBR.
Table 397: UART1 Receiver Buffer Register (U1RBR - address 0xE001 0000 when DLAB = 0,
Read Only) bit description
Bit
Symbol
Description
Reset Value
7:0 RBR
The UART1 Receiver Buffer Register contains the oldest
received byte in the UART1 RX FIFO.
undefined
4.2 UART1 Transmitter Holding Register (U1THR - 0xE001 0000 when
DLAB = 0, Write Only)
The U1THR is the top byte of the UART1 TX FIFO. The top byte is the newest character in
the TX FIFO and can be written via the bus interface. The LSB represents the first bit to
transmit.
The Divisor Latch Access Bit (DLAB) in U1LCR must be zero in order to access the
U1THR. The U1THR is always Write Only.
Table 398: UART1 Transmitter Holding Register (U1THR - address 0xE001 0000 when
DLAB = 0, Write Only) bit description
Bit
Symbol
Description
Reset Value
7:0 THR
Writing to the UART1 Transmit Holding Register causes the data NA
to be stored in the UART1 transmit FIFO. The byte will be sent
when it reaches the bottom of the FIFO and the transmitter is
available.
4.3 UART1 Divisor Latch LSB and MSB Registers (U1DLL - 0xE001 0000
and U1DLM - 0xE001 0004, when DLAB = 1)
The UART1 Divisor Latch is part of the UART1 Baud Rate Generator and holds the value
used to divide the APB clock (PCLK) in order to produce the baud rate clock, which must
form a 16 bit divisor where U1DLL contains the lower 8 bits of the divisor and U1DLM
contains the higher 8 bits of the divisor. A 0x0000 value is treated like a 0x0001 value as
division by zero is not allowed.The Divisor Latch Access Bit (DLAB) in U1LCR must be
one in order to access the UART1 Divisor Latches. Details on how to select the right value
for U1DLL and U1DLM can be found later on in this chapter.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
(3)
pclk
UART1baudrate
=
-------------------------------------------------------------------------------
16 × (256 × U1DLM + U1DLL)
Table 399: UART1 Divisor Latch LSB Register (U1DLL - address 0xE001 0000 when
DLAB = 1) bit description
Bit
Symbol
Description
Reset Value
7:0 DLLSB
The UART1 Divisor Latch LSB Register, along with the U1DLM 0x01
register, determines the baud rate of the UART1.
Table 400: UART1 Divisor Latch MSB Register (U1DLM - address 0xE001 0004 when
DLAB = 1) bit description
Bit
Symbol
Description
Reset Value
7:0 DLMSB
The UART1 Divisor Latch MSB Register, along with the U1DLL 0x00
register, determines the baud rate of the UART1.
4.4 UART1 Interrupt Enable Register (U1IER - 0xE001 0004, when
DLAB = 0)
The U1IER is used to enable the four UART1 interrupt sources.
Table 401: UART1 Interrupt Enable Register (U1IER - address 0xE001 0004 when DLAB = 0)
bit description
Bit
Symbol
Value
Description
Reset
Value
0
RBR
Interrupt
Enable
enables the Receive Data Available interrupt for UART1. It
also controls the Character Receive Time-out interrupt.
0
0
0
0
0
1
Disable the RDA interrupts.
Enable the RDA interrupts.
1
THRE
Interrupt
Enable
enables the THRE interrupt for UART1. The status of this
interrupt can be read from U1LSR[5].
0
1
Disable the THRE interrupts.
Enable the THRE interrupts.
2
RX Line
Interrupt
Enable
enables the UART1 RX line status interrupts. The status of
this interrupt can be read from U1LSR[4:1].
0
1
Disable the RX line status interrupts.
Enable the RX line status interrupts.
3
Modem
Status
enables the modem interrupt. The status of this interrupt
can be read from U1MSR[3:0].
Interrupt
Enable
0
1
Disable the modem interrupt.
Enable the modem interrupt.
6:4
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 401: UART1 Interrupt Enable Register (U1IER - address 0xE001 0004 when DLAB = 0)
bit description
Bit
Symbol
Value
Description
Reset
Value
7
CTS
Interrupt
Enable
If auto-cts mode is enabled this bit enables/disables the
modem status interrupt generation on a CTS1 signal
transition. If auto-cts mode is disabled a CTS1 transition
will generate an interrupt if Modem Status Interrupt Enable
(U1IER[3]) is set.
0
In normal operation a CTS1 signal transition will generate
a Modem Status Interrupt unless the interrupt has been
disabled by clearing the U1IER[3] bit in the U1IER register.
In auto-cts mode a transition on the CTS1 bit will trigger an
interrupt only if both the U1IER[3] and U1IER[7] bits are
set.
0
1
Disable the CTS interrupt.
Enable the CTS interrupt.
8
9
ABEOIntEn
ABTOIntEn
enables the end of auto-baud interrupt.
Disable End of Auto-baud Interrupt.
Enable End of Auto-baud Interrupt.
enables the auto-baud time-out interrupt.
Disable Auto-baud Time-out Interrupt.
Enable Auto-baud Time-out Interrupt.
0
0
0
1
0
1
31:10 -
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
4.5 UART1 Interrupt Identification Register (U1IIR - 0xE001 0008, Read
Only)
The U1IIR provides a status code that denotes the priority and source of a pending
interrupt. The interrupts are frozen during an U1IIR access. If an interrupt occurs during
an U1IIR access, the interrupt is recorded for the next U1IIR access.
Table 402: UART1 Interrupt Identification Register (U1IIR - address 0xE001 0008, Read Only)
bit description
Bit
Symbol
Value Description
Reset
Value
0
IntStatus
Interrupt status. Note that U1IIR[0] is active low. The
1
pending interrupt can be determined by evaluating
U1IIR[3:1].
0
1
At least one interrupt is pending.
No interrupt is pending.
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Table 402: UART1 Interrupt Identification Register (U1IIR - address 0xE001 0008, Read Only)
bit description
Bit
Symbol
Value Description
Reset
Value
3:1
IntId
Interrupt identification. U1IER[3:1] identifies an interrupt
0
corresponding to the UART1 Rx FIFO. All other
combinations of U1IER[3:1] not listed above are reserved
(100,101,111).
011 1 - Receive Line Status (RLS).
010 2a - Receive Data Available (RDA).
110 2b - Character Time-out Indicator (CTI).
001 3 - THRE Interrupt.
000 4 - Modem Interrupt.
5:4
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
7:6
8
FIFO Enable
ABEOInt
These bits are equivalent to U1FCR[0].
0
0
End of auto-baud interrupt. True if auto-baud has finished
successfully and interrupt is enabled.
9
ABTOInt
-
Auto-baud time-out interrupt. True if auto-baud has timed
out and interrupt is enabled.
0
31:10
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
Bit U1IIR[9:8] are set by the auto-baud function and signal a time-out or end of auto-baud
condition. The auto-baud interrupt conditions are cleared by setting the corresponding
Clear bits in the Auto-baud Control Register.
If the IntStatus bit is 1 no interrupt is pending and the IntId bits will be zero. If the IntStatus
is 0, a non auto-baud interrupt is pending in which case the IntId bits identify the type of
interrupt handler routine can determine the cause of the interrupt and how to clear the
active interrupt. The U1IIR must be read in order to clear the interrupt prior to exiting the
Interrupt Service Routine.
The UART1 RLS interrupt (U1IIR[3:1] = 011) is the highest priority interrupt and is set
whenever any one of four error conditions occur on the UART1RX input: overrun error
(OE), parity error (PE), framing error (FE) and break interrupt (BI). The UART1 Rx error
condition that set the interrupt can be observed via U1LSR[4:1]. The interrupt is cleared
upon an U1LSR read.
The UART1 RDA interrupt (U1IIR[3:1] = 010) shares the second level priority with the CTI
interrupt (U1IIR[3:1] = 110). The RDA is activated when the UART1 Rx FIFO reaches the
trigger level defined in U1FCR7:6 and is reset when the UART1 Rx FIFO depth falls below
the trigger level. When the RDA interrupt goes active, the CPU can read a block of data
defined by the trigger level.
The CTI interrupt (U1IIR[3:1] = 110) is a second level interrupt and is set when the UART1
Rx FIFO contains at least one character and no UART1 Rx FIFO activity has occurred in
3.5 to 4.5 character times. Any UART1 Rx FIFO activity (read or write of UART1 RSR) will
clear the interrupt. This interrupt is intended to flush the UART1 RBR after a message has
been received that is not a multiple of the trigger level size. For example, if a peripheral
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wished to send a 105 character message and the trigger level was 10 characters, the
CPU would receive 10 RDA interrupts resulting in the transfer of 100 characters and 1 to 5
CTI interrupts (depending on the service routine) resulting in the transfer of the remaining
5 characters.
Table 403: UART1 Interrupt Handling
U1IIR[3:0] Priority Interrupt Interrupt Source
Interrupt
Reset
value[1]
Type
0001
-
None
None
-
0110
Highest RX Line
Status /
U1LSR
Read[2]
Error
0100
Second RX Data Rx data available or trigger level reached in FIFO U1RBR
Available (U1FCR0=1)
UART1
FIFO drops
below
trigger level
1100
Second Character Minimum of one character in the RX FIFO and no U1RBR
Time-out character input or removed during a time period
indication depending on how many characters are in FIFO
and what the trigger level is set at (3.5 to 4.5
character times).
Read[3]
The exact time will be:
[(word length) × 7 - 2] × 8 + [(trigger level - number
of characters) × 8 + 1] RCLKs
0010
0000
Third
THRE
THRE[2]
U1IIR
source of
interrupt) or
THR write
Fourth Modem
Status
CTS or DSR or RI or DCD
MSR Read
[1] Values "0000", “0011”, “0101”, “0111”, “1000”, “1001”, “1010”, “1011”,”1101”,”1110”,”1111” are reserved.
[3] For details see Section 17–4.1 “UART1 Receiver Buffer Register (U1RBR - 0xE001 0000, when DLAB = 0
[4] For details see Section 17–4.5 “UART1 Interrupt Identification Register (U1IIR - 0xE001 0008, Read Only)”
The UART1 THRE interrupt (U1IIR[3:1] = 001) is a third level interrupt and is activated
when the UART1 THR FIFO is empty provided certain initialization conditions have been
met. These initialization conditions are intended to give the UART1 THR FIFO a chance to
fill up with data to eliminate many THRE interrupts from occurring at system start-up. The
initialization conditions implement a one character delay minus the stop bit whenever
THRE = 1 and there have not been at least two characters in the U1THR at one time since
the last THRE = 1 event. This delay is provided to give the CPU time to write data to
U1THR without a THRE interrupt to decode and service. A THRE interrupt is set
immediately if the UART1 THR FIFO has held two or more characters at one time and
currently, the U1THR is empty. The THRE interrupt is reset when a U1THR write occurs or
a read of the U1IIR occurs and the THRE is the highest interrupt (U1IIR[3:1] = 001).
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It is the lowest priority interrupt and is activated whenever there is any state change on
modem inputs pins, DCD, DSR or CTS. In addition, a low to high transition on modem
input RI will generate a modem interrupt. The source of the modem interrupt can be
determined by examining U1MSR[3:0]. A U1MSR read will clear the modem interrupt.
4.6 UART1 FIFO Control Register (U1FCR - 0xE001 0008, Write Only)
The U1FCR controls the operation of the UART1 RX and TX FIFOs.
Table 404: UART1 FIFO Control Register (U1FCR - address 0xE001 0008, Write Only) bit
description
Bit Symbol Value Description
Reset
Value
0
FIFO
Enable
0
1
UART1 FIFOs are disabled. Must not be used in the application.
0
Active high enable for both UART1 Rx and TX FIFOs and
U1FCR[7:1] access. This bit must be set for proper UART1
operation. Any transition on this bit will automatically clear the
UART1 FIFOs.
1
RX FIFO 0
No impact on either of UART1 FIFOs.
0
0
Reset
1
Writing a logic 1 to U1FCR[1] will clear all bytes in UART1 Rx
FIFO and reset the pointer logic. This bit is self-clearing.
2
TX FIFO
Reset
0
1
No impact on either of UART1 FIFOs.
Writing a logic 1 to U1FCR[2] will clear all bytes in UART1 TX
FIFO and reset the pointer logic. This bit is self-clearing.
5:3
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
0
7:6 RX
Trigger
Level
These two bits determine how many receiver UART1 FIFO
characters must be written before an interrupt is activated.
00 Trigger level 0 (1 character or 0x01).
01 Trigger level 1 (4 characters or 0x04).
10 Trigger level 2 (8 characters or 0x08).
11 Trigger level 3 (14 characters or 0x0E).
4.7 UART1 Line Control Register (U1LCR - 0xE001 000C)
The U1LCR determines the format of the data character that is to be transmitted or
received.
Table 405: UART1 Line Control Register (U1LCR - address 0xE001 000C) bit description
Bit Symbol Value Description Reset
Value
1:0 Word
Length
00
01
10
11
0
5 bit character length.
0
6 bit character length.
Select
7 bit character length.
8 bit character length.
2
3
Stop Bit
Select
1 stop bit.
0
0
1
2 stop bits (1.5 if U1LCR[1:0]=00).
Disable parity generation and checking.
Enable parity generation and checking.
Parity
0
Enable
1
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Table 405: UART1 Line Control Register (U1LCR - address 0xE001 000C) bit description
Bit Symbol Value Description Reset
Value
5:4 Parity
Select
00
01
Odd parity. Number of 1s in the transmitted character and the
attached parity bit will be odd.
0
Even Parity. Number of 1s in the transmitted character and the
attached parity bit will be even.
10
11
0
Forced "1" stick parity.
Forced "0" stick parity.
Disable break transmission.
6
7
Break
Control
0
0
1
Enable break transmission. Output pin UART1 TXD is forced to
logic 0 when U1LCR[6] is active high.
Divisor
Latch
Access
Bit
0
1
Disable access to Divisor Latches.
Enable access to Divisor Latches.
(DLAB)
4.8 UART1 Modem Control Register (U1MCR - 0xE001 0010)
The U1MCR enables the modem loopback mode and controls the modem output signals.
Table 406: UART1 Modem Control Register (U1MCR - address 0xE001 0010) bit description
Bit Symbol Value Description
Reset
value
0
DTR
Control
Source for modem output pin, DTR. This bit reads as 0 when
modem loopback mode is active.
0
0
0
0
1
RTS
Control
Source for modem output pin RTS. This bit reads as 0 when
modem loopback mode is active.
3-2
4
-
NA
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
Loopback
Mode
Select
The modem loopback mode provides a mechanism to perform
diagnostic loopback testing. Serial data from the transmitter is
connected internally to serial input of the receiver. Input pin,
RXD1, has no effect on loopback and output pin, TXD1 is held in
marking state. The four modem inputs (CTS, DSR, RI and DCD)
are disconnected externally. Externally, the modem outputs (RTS,
DTR) are set inactive. Internally, the four modem outputs are
connected to the four modem inputs. As a result of these
connections, the upper four bits of the U1MSR will be driven by
the lower four bits of the U1MCR rather than the four modem
inputs in normal mode. This permits modem status interrupts to
be generated in loopback mode by writing the lower four bits of
U1MCR.
0
Disable modem loopback mode.
Enable modem loopback mode.
1
5
-
NA
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
0
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 406: UART1 Modem Control Register (U1MCR - address 0xE001 0010) bit description
Bit Symbol Value Description
Reset
value
6
7
RTSen
CTSen
0
1
0
1
Disable auto-rts flow control.
Enable auto-rts flow control.
Disable auto-cts flow control.
Enable auto-cts flow control.
0
0
4.9 Auto-flow control
If auto-RTS mode is enabled the UART1‘s receiver FIFO hardware controls the RTS1
output of the UART1. If the auto-CTS mode is enabled the UART1‘s U1TSR hardware will
only start transmitting if the CTS1 input signal is asserted.
17.4.9.1 Auto-RTS
The auto-RTS function is enabled by setting the RTSen bit. Auto-RTS data flow control
originates in the U1RBR module and is linked to the programmed receiver FIFO trigger
level. If auto-RTS is enabled, the data-flow is controlled as follows:
When the receiver FIFO level reaches the programmed trigger level, RTS1 is deasserted
(to a high value). It is possible that the sending UART sends an additional byte after the
trigger level is reached (assuming the sending UART has another byte to send) because it
might not recognize the deassertion of RTS1 until after it has begun sending the additional
byte. RTS1 is automatically reasserted (to a low value) once the receiver FIFO has
reached the previous trigger level. The reassertion of RTS1 signals to the sending UART
to continue transmitting data.
If Auto-RTS mode is disabled, the RTSen bit controls the RTS1 output of the UART1. If
Auto-RTS mode is enabled, hardware controls the RTS1 output, and the actual value of
RTS1 will be copied in the RTS Control bit of the UART1. As long as Auto-RTS is enabled,
the value of the RTS Control bit is read-only for software.
Example: Suppose the UART1 operating in type 550 has trigger level in U1FCR set to
0x2 then if Auto-RTS is enabled the UART1 will deassert the RTS1 output as soon as the
reasserted as soon as the receive FIFO hits the previous trigger level: 4 bytes.
UART1 Rx
RTS1 pin
start
byte N
stop start
bits0..7
stop
start bits0..7
stop
UART1 Rx
FIFO read
UART1 Rx
FIFO level
N-1
N
N-1
N-2
N-1
N-2
M+2
M+1
M
M-1
Fig 68. Auto-RTS Functional Timing
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
17.4.9.2 Auto-CTS
The Auto-CTS function is enabled by setting the CTSen bit. If Auto-CTS is enabled the
transmitter circuitry in the U1TSR module checks CTS1 input before sending the next data
byte. When CTS1 is active (low), the transmitter sends the next byte. To stop the
transmitter from sending the following byte, CTS1 must be released before the middle of
the last stop bit that is currently being sent. In Auto-CTS mode a change of the CTS1
signal does not trigger a modem status interrupt unless the CTS Interrupt Enable bit is set,
generating a Modem Status interrupt.
Table 407: Modem status interrupt generation
Enable
Modem
Status
Interrupt
(U1ER[3]
)
CTSen
(U1MCR[7]) Interrupt
Enable
CTS
Delta CTS Delta DCD or Trailing Edge Modem
(U1MSR[0]) RI or
Delta DSR (U1MSR[3] or
Status
Interrupt
(U1IER[7])
U1MSR[2] or U1MSR[1])
0
1
1
1
1
1
1
1
1
x
0
0
0
1
1
1
1
1
x
x
x
x
0
0
1
1
1
x
0
1
x
x
x
0
1
x
x
0
x
1
0
1
0
x
1
No
No
Yes
Yes
No
Yes
No
Yes
Yes
The auto-CTS function reduces interrupts to the host system. When flow control is
enabled, a CTS1 state change does not trigger host interrupts because the device
automatically controls its own transmitter. Without Auto-CTS, the transmitter sends any
data present in the transmit FIFO and a receiver overrun error can result. Figure 17–69
illustrates the Auto-CTS functional timing.
UART1 TX
CTS1 pin
start
bits0..7
stop
start bits0..7
stop
start
bits0..7 stop
Fig 69. Auto-CTS Functional Timing
While starting transmission of the initial character the CTS1 signal is asserted.
Transmission will stall as soon as the pending transmission has completed. The UART will
continue transmitting a 1 bit as long as CTS1 is deasserted (high). As soon as CTS1 gets
deasserted transmission resumes and a start bit is sent followed by the data bits of the
next character.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
4.10 UART1 Line Status Register (U1LSR - 0xE001 0014, Read Only)
The U1LSR is a read-only register that provides status information on the UART1 TX and
RX blocks.
Table 408: UART1 Line Status Register (U1LSR - address 0xE001 0014, Read Only) bit
description
Bit Symbol
Value Description
Reset
Value
0
1
Receiver
Data
Ready
(RDR)
U1LSR[0] is set when the U1RBR holds an unread character and
is cleared when the UART1 RBR FIFO is empty.
U1RBR is empty.
0
0
1
U1RBR contains valid data.
Overrun
Error
(OE)
The overrun error condition is set as soon as it occurs. An U1LSR
read clears U1LSR[1]. U1LSR[1] is set when UART1 RSR has a
new character assembled and the UART1 RBR FIFO is full. In
this case, the UART1 RBR FIFO will not be overwritten and the
character in the UART1 RSR will be lost.
0
0
1
Overrun error status is inactive.
Overrun error status is active.
2
Parity
Error
(PE)
When the parity bit of a received character is in the wrong state, a
parity error occurs. An U1LSR read clears U1LSR[2]. Time of
parity error detection is dependent on U1FCR[0].
0
Note: A parity error is associated with the character at the top of
the UART1 RBR FIFO.
0
1
Parity error status is inactive.
Parity error status is active.
3
Framing
Error
(FE)
When the stop bit of a received character is a logic 0, a framing
error occurs. An U1LSR read clears U1LSR[3]. The time of the
framing error detection is dependent on U1FCR0. Upon detection
of a framing error, the RX will attempt to resynchronize to the data
and assume that the bad stop bit is actually an early start bit.
However, it cannot be assumed that the next received byte will be
correct even if there is no Framing Error.
0
Note: A framing error is associated with the character at the top
of the UART1 RBR FIFO.
0
1
Framing error status is inactive.
Framing error status is active.
4
Break
Interrupt
(BI)
When RXD1 is held in the spacing state (all 0’s) for one full
character transmission (start, data, parity, stop), a break interrupt
occurs. Once the break condition has been detected, the receiver
goes idle until RXD1 goes to marking state (all 1’s). An U1LSR
read clears this status bit. The time of break detection is
dependent on U1FCR[0].
0
Note: The break interrupt is associated with the character at the
top of the UART1 RBR FIFO.
0
1
Break interrupt status is inactive.
Break interrupt status is active.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 408: UART1 Line Status Register (U1LSR - address 0xE001 0014, Read Only) bit
description
Bit Symbol
Value Description
Reset
Value
5
Transmitte
r Holding
Register
Empty
THRE is set immediately upon detection of an empty UART1
1
THR and is cleared on a U1THR write.
U1THR contains valid data.
U1THR is empty.
0
1
(THRE)
6
7
Transmitte
r Empty
(TEMT)
TEMT is set when both U1THR and U1TSR are empty; TEMT is
cleared when either the U1TSR or the U1THR contain valid data.
1
0
0
1
U1THR and/or the U1TSR contains valid data.
U1THR and the U1TSR are empty.
Error in RX
FIFO
(RXFE)
U1LSR[7] is set when a character with a RX error such as framing
error, parity error or break interrupt, is loaded into the U1RBR.
This bit is cleared when the U1LSR register is read and there are
no subsequent errors in the UART1 FIFO.
0
1
U1RBR contains no UART1 RX errors or U1FCR[0]=0.
UART1 RBR contains at least one UART1 RX error.
4.11 UART1 Modem Status Register (U1MSR - 0xE001 0018)
The U1MSR is a read-only register that provides status information on the modem input
signals. U1MSR[3:0] is cleared on U1MSR read. Note that modem signals have no direct
affect on UART1 operation, they facilitate software implementation of modem signal
operations.
Table 409: UART1 Modem Status Register (U1MSR - address 0xE001 0018) bit description
Bit Symbol Value Description
Reset
Value
0
1
2
Delta
CTS
Set upon state change of input CTS. Cleared on an U1MSR read.
No change detected on modem input, CTS.
0
0
0
0
1
State change detected on modem input, CTS.
Delta
DSR
Set upon state change of input DSR. Cleared on an U1MSR read.
No change detected on modem input, DSR.
0
1
State change detected on modem input, DSR.
Trailing
Edge RI
Set upon low to high transition of input RI. Cleared on an U1MSR
read.
0
1
No change detected on modem input, RI.
Low-to-high transition detected on RI.
3
4
Delta
DCD
Set upon state change of input DCD. Cleared on an U1MSR read.
No change detected on modem input, DCD.
State change detected on modem input, DCD.
0
0
0
1
CTS
Clear To Send State. Complement of input signal CTS. This bit is
connected to U1MCR[1] in modem loopback mode.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 409: UART1 Modem Status Register (U1MSR - address 0xE001 0018) bit description
Bit Symbol Value Description Reset
Value
5
6
7
DSR
RI
Data Set Ready State. Complement of input signal DSR. This bit is
connected to U1MCR[0] in modem loopback mode.
0
Ring Indicator State. Complement of input RI. This bit is connected
to U1MCR[2] in modem loopback mode.
0
0
DCD
Data Carrier Detect State. Complement of input DCD. This bit is
connected to U1MCR[3] in modem loopback mode.
4.12 UART1 Scratch Pad Register (U1SCR - 0xE001 001C)
The U1SCR has no effect on the UART1 operation. This register can be written and/or
read at user’s discretion. There is no provision in the interrupt interface that would indicate
to the host that a read or write of the U1SCR has occurred.
Table 410: UART1 Scratch Pad Register (U1SCR - address 0xE001 0014) bit description
Bit Symbol Description
Reset Value
7:0 Pad
A readable, writable byte.
0x00
4.13 UART1 Auto-baud Control Register (U1ACR - 0xE001 0020)
The UART1 Auto-baud Control Register (U1ACR) controls the process of measuring the
incoming clock/data rate for the baud rate generation and can be read and written at
user’s discretion.
Table 411: Auto-baud Control Register (U1ACR - address 0xE001 0020) bit description
Bit
Symbol
Value Description
This bit is automatically cleared after auto-baud
Reset value
0
Start
0
completion.
0
1
Auto-baud stop (auto-baud is not running).
Auto-baud start (auto-baud is running).Auto-baud run
bit. This bit is automatically cleared after auto-baud
completion.
1
2
Mode
Auto-baud mode select bit.
Mode 0.
0
0
1
0
1
Mode 1.
AutoRestart
No restart
0
0
Restart in case of time-out (counter restarts at next
UART1 Rx falling edge)
7:3
8
-
NA
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
0
0
ABEOIntClr
End of auto-baud interrupt clear bit (write only
accessible).
0
1
Writing a 0 has no impact.
Writing a 1 will clear the corresponding interrupt in the
U1IIR.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 411: Auto-baud Control Register (U1ACR - address 0xE001 0020) bit description
Bit
Symbol
Value Description
Auto-baud time-out interrupt clear bit (write only
Reset value
9
ABTOIntClr
0
accessible).
0
1
Writing a 0 has no impact.
Writing a 1 will clear the corresponding interrupt in the
U1IIR.
31:10 -
NA
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
0
4.14 Auto-baud
The UART1 auto-baud function can be used to measure the incoming baud-rate based on
the ”AT" protocol (Hayes command). If enabled the auto-baud feature will measure the bit
time of the receive data stream and set the divisor latch registers U1DLM and U1DLL
accordingly.
Auto-baud is started by setting the U1ACR Start bit. Auto-baud can be stopped by clearing
the U1ACR Start bit. The Start bit will clear once auto-baud has finished and reading the
bit will return the status of auto-baud (pending/finished).
Two auto-baud measuring modes are available which can be selected by the U1ACR
Mode bit. In mode 0 the baud-rate is measured on two subsequent falling edges of the
UART1 Rx pin (the falling edge of the start bit and the falling edge of the least significant
bit). In mode 1 the baud-rate is measured between the falling edge and the subsequent
rising edge of the UART1 Rx pin (the length of the start bit).
The U1ACR AutoRestart bit can be used to automatically restart baud-rate measurement
if a time-out occurs (the rate measurement counter overflows). If this bit is set the rate
measurement will restart at the next falling edge of the UART1 Rx pin.
The auto-baud function can generate two interrupts.
• The U1IIR ABTOInt interrupt will get set if the interrupt is enabled (U1IER ABToIntEn
is set and the auto-baud rate measurement counter overflows).
• The U1IIR ABEOInt interrupt will get set if the interrupt is enabled (U1IER ABEOIntEn
is set and the auto-baud has completed successfully).
The auto-baud interrupts have to be cleared by setting the corresponding U1ACR
ABTOIntClr and ABEOIntEn bits.
Typically the fractional baud-rate generator is disabled (DIVADDVAL = 0) during
auto-baud. However, if the fractional baud-rate generator is enabled (DIVADDVAL > 0), it
is going to impact the measuring of UART1 Rx pin baud-rate, but the value of the U1FDR
register is not going to be modified after rate measurement. Also, when auto-baud is used,
any write to U1DLM and U1DLL registers should be done before U1ACR register write.
The minimum and the maximum baudrates supported by UART1 are function of pclk,
number of data bits, stop bits and parity bits.
(4)
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
2 × PCLK
PCLK
------------------------
-----------------------------------------------------------------------------------------------------------
= ratemax
ratemin =
≤ UART1
≤
baudrate
15
16 × (2 + databits + paritybits + stopbits)
16 × 2
4.15 Auto-baud modes
When the software is expecting an ”AT" command, it configures the UART1 with the
expected character format and sets the U1ACR Start bit. The initial values in the divisor
latches U1DLM and U1DLM don‘t care. Because of the ”A" or ”a" ASCII coding
(”A" = 0x41, ”a" = 0x61), the UART1 Rx pin sensed start bit and the LSB of the expected
character are delimited by two falling edges. When the U1ACR Start bit is set, the
auto-baud protocol will execute the following phases:
1. On U1ACR Start bit setting, the baud-rate measurement counter is reset and the
UART1 U1RSR is reset. The U1RSR baud rate is switch to the highest rate.
2. A falling edge on UART1 Rx pin triggers the beginning of the start bit. The rate
measuring counter will start counting pclk cycles optionally pre-scaled by the
fractional baud-rate generator.
3. During the receipt of the start bit, 16 pulses are generated on the RSR baud input with
the frequency of the (fractional baud-rate pre-scaled) UART1 input clock,
guaranteeing the start bit is stored in the U1RSR.
4. During the receipt of the start bit (and the character LSB for mode = 0) the rate
counter will continue incrementing with the pre-scaled UART1 input clock (pclk).
5. If Mode = 0 then the rate counter will stop on next falling edge of the UART1 Rx pin. If
Mode = 1 then the rate counter will stop on the next rising edge of the UART1 Rx pin.
6. The rate counter is loaded into U1DLM/U1DLL and the baud-rate will be switched to
normal operation. After setting the U1DLM/U1DLL the end of auto-baud interrupt
U1IIR ABEOInt will be set, if enabled. The U1RSR will now continue receiving the
remaining bits of the ”A/a" character.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
'A' (0x41) or 'a' (0x61)
start
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7 parity stop
UARTn RX
start bit
LSB of 'A' or 'a'
U0ACR start
rate counter
16xbaud_rate
16 cycles
16 cycles
a. Mode 0 (start bit and LSB are used for auto-baud)
'A' (0x41) or 'a' (0x61)
start
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7 parity stop
UARTn RX
start bit
LSB of 'A' or 'a'
U1ACR start
rate counter
16xbaud_rate
16 cycles
b. Mode 1 (only start bit is used for auto-baud)
Fig 70. Auto-baud a) mode 0 and b) mode 1 waveform
4.16 UART1 Fractional Divider Register (U1FDR - 0xE001 0028)
The UART1 Fractional Divider Register (U1FDR) controls the clock pre-scaler for the
baud rate generation and can be read and written at the user’s discretion. This pre-scaler
takes the APB clock and generates an output clock according to the specified fractional
requirements.
Important: If the fractional divider is active (DIVADDVAL > 0) and DLM = 0, the value of
the DLL register must be 3 or greater.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 412: UART1 Fractional Divider Register (U1FDR - address 0xE001 0028) bit description
Bit
Function
Value Description
Reset
value
3:0
DIVADDVAL
0
1
Baud-rate generation pre-scaler divisor value. If this field is
0, fractional baud-rate generator will not impact the UARTn
baudrate.
0
7:4
MULVAL
Baud-rate pre-scaler multiplier value. This field must be
greater or equal 1 for UARTn to operate properly,
regardless of whether the fractional baud-rate generator is
used or not.
1
31:8
-
NA
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
0
This register controls the clock pre-scaler for the baud rate generation. The reset value of
the register keeps the fractional capabilities of UART1 disabled making sure that UART1
is fully software and hardware compatible with UARTs not equipped with this feature.
UART1 baudrate can be calculated as (n = 1):
(5)
PCLK
UARTnbaudrate
=
----------------------------------------------------------------------------------------------------------------------------------
DivAddVal
⎛
⎞
16 × (256 × UnDLM + UnDLL) × 1 +
----------------------------
⎝
⎠
MulVal
Where PCLK is the peripheral clock, U1DLM and U1DLL are the standard UART1 baud
rate divider registers, and DIVADDVAL and MULVAL are UART1 fractional baudrate
generator specific parameters.
The value of MULVAL and DIVADDVAL should comply to the following conditions:
1. 0 < MULVAL ≤ 15
2. 0 ≤ DIVADDVAL < 15
3. DIVADDVAL<MULVAL
The value of the U1FDR should not be modified while transmitting/receiving data or data
may be lost or corrupted.
If the U1FDR register value does not comply to these two requests, then the fractional
divider output is undefined. If DIVADDVAL is zero then the fractional divider is disabled,
and the clock will not be divided.
4.16.1 Baudrate calculation
UART can operate with or without using the Fractional Divider. In real-life applications it is
likely that the desired baudrate can be achieved using several different Fractional Divider
settings. The following algorithm illustrates one way of finding a set of DLM, DLL,
MULVAL, and DIVADDVAL values. Such set of parameters yields a baudrate with a
relative error of less than 1.1% from the desired one.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Calculating UART
baudrate (BR)
PCLK,
BR
DL est = PCLK/(16 x BR)
DLest is an
integer?
True
DIVADDVAL = 0
False
MULVAL = 1
FR est = 1.5
Pick another FRest from
the range [1.1, 1.9]
DL est = Int(PCLK/(16 x BR x FR est))
FRest = PCLK/(16 x BR x DL est
)
False
1.1 < FR est < 1.9?
True
DIVADDVAL = table(FR est
)
MULVAL = table(FR
)
est
DLM = DLest [15:8]
DLL = DLest [7:0]
End
Fig 71. Algorithm for setting UART dividers
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Table 413. Fractional Divider setting look-up table
FR
DivAddVal/ FR
MulVal
DivAddVal/ FR
MulVal
DivAddVal/ FR
MulVal
DivAddVal/
MulVal
1.000
1.067
1.071
1.077
1.083
1.091
1.100
1.111
1.125
1.133
1.143
1.154
1.167
1.182
1.200
1.214
1.222
1.231
0/1
1.250
1/4
1.500
1/2
1.750
3/4
1/15
1/14
1/13
1/12
1/11
1/10
1/9
1.267
1.273
1.286
1.300
1.308
1.333
1.357
1.364
1.375
1.385
1.400
1.417
1.429
1.444
1.455
1.462
1.467
4/15
3/11
2/7
1.533
1.538
1.545
1.556
1.571
1.583
1.600
1.615
1.625
1.636
1.643
1.667
1.692
1.700
1.714
1.727
1.733
8/15
7/13
6/11
5/9
1.769
1.778
1.786
1.800
1.818
1.833
1.846
1.857
1.867
1.875
1.889
1.900
1.909
1.917
1.923
1.929
1.933
10/13
7/9
11/14
4/5
3/10
4/13
1/3
4/7
9/11
5/6
7/12
3/5
5/14
4/11
3/8
11/13
6/7
1/8
8/13
5/8
2/15
1/7
13/15
7/8
5/13
2/5
7/11
9/14
2/3
2/13
1/6
8/9
5/12
3/7
9/10
10/11
11/12
12/13
13/14
14/15
2/11
1/5
9/13
7/10
5/7
4/9
3/14
2/9
5/11
6/13
7/15
8/11
11/15
3/13
4.16.1.1 Example 1: PCLK = 14.7456 MHz, BR = 9600
According to the the provided algorithm DLest = PCLK/(16 x BR) = 14.7456 MHz / (16 x
9600) = 96. Since this DLest is an integer number, DIVADDVAL = 0, MULVAL = 1,
DLM = 0, and DLL = 96.
4.16.1.2 Example 2: PCLK = 12 MHz, BR = 115200
According to the the provided algorithm DLest = PCLK/(16 x BR) = 12 MHz / (16 x 115200)
= 6.51. This DLest is not an integer number and the next step is to estimate the FR
parameter. Using an initial estimate of FRest = 1.5 a new DLest = 4 is calculated and FRest
is recalculated as FRest = 1.628. Since FRest = 1.628 is within the specified range of 1.1
and 1.9, DIVADDVAL and MULVAL values can be obtained from the attached look-up
table.
equivalent to DIVADDVAL = 5 and MULVAL = 8.
Based on these findings, the suggested UART setup would be: DLM = 0, DLL = 4,
rate has a relative error of 0.16% from the originally specified 115200.
4.17 UART1 Transmit Enable Register (U1TER - 0xE001 0030)
In addition to being equipped with full hardware flow control (auto-cts and auto-rts
mechanisms described above), U1TER enables implementation of software flow control,
too. When TxEn=1, UART1 transmitter will keep sending data as long as they are
available. As soon as TxEn becomes 0, UART1 transmission will stop.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
control, it is strongly suggested to let UART1 hardware implemented auto flow control
features take care of this, and limit the scope of TxEn to software flow control.
LPC2400’s U1TER enables implementation of software and hardware flow control. When
TXEn=1, UART1 transmitter will keep sending data as long as they are available. As soon
as TXEn becomes 0, UART1 transmission will stop.
Table 414: UART1 Transmit Enable Register (U1TER - address 0xE001 0030) bit description
Bit Symbol
Description
Reset Value
6:0
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
7
TXEN
When this bit is 1, as it is after a Reset, data written to the THR
is output on the TXD pin as soon as any preceding data has
been sent. If this bit cleared to 0 while a character is being sent,
the transmission of that character is completed, but no further
characters are sent until this bit is set again. In other words, a 0
in this bit blocks the transfer of characters from the THR or TX
FIFO into the transmit shift register. Software can clear this bit
when it detects that the a hardware-handshaking TX-permit
signal (CTS) has gone false, or with software handshaking,
when it receives an XOFF character (DC3). Software can set
this bit again when it detects that the TX-permit signal has gone
true, or when it receives an XON (DC1) character.
1
5. Architecture
The architecture of the UART1 is shown below in the block diagram.
The APB interface provides a communications link between the CPU or host and the
UART1.
The UART1 receiver block, U1RX, monitors the serial input line, RXD1, for valid input.
The UART1 RX Shift Register (U1RSR) accepts valid characters via RXD1. After a valid
character is assembled in the U1RSR, it is passed to the UART1 RX Buffer Register FIFO
to await access by the CPU or host via the generic host interface.
The UART1 transmitter block, U1TX, accepts data written by the CPU or host and buffers
the data in the UART1 TX Holding Register FIFO (U1THR). The UART1 TX Shift Register
(U1TSR) reads the data stored in the U1THR and assembles the data to transmit via the
serial output pin, TXD1.
The UART1 Baud Rate Generator block, U1BRG, generates the timing enables used by
the UART1 TX block. The U1BRG clock input source is the APB clock (PCLK). The main
clock is divided down per the divisor specified in the U1DLL and U1DLM registers. This
divided down clock is a 16x oversample clock, NBAUDOUT.
The modem interface contains registers U1MCR and U1MSR. This interface is
responsible for handshaking between a modem peripheral and the UART1.
The interrupt interface contains registers U1IER and U1IIR. The interrupt interface
receives several one clock wide enables from the U1TX and U1RX blocks.
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Chapter 17: LPC24XX Universal Asynchronous Receiver/Transmitter
Status information from the U1TX and U1RX is stored in the U1LSR. Control information
for the U1TX and U1RX is stored in the U1LCR.
MODEM
U1MSR
U1TX
NTXRDY
TXD1
U1THR
U1TSR
CTS
DSR
RI
U1BRG
DCD
DTR
U1DLL
U1DLM
NBAUDOUT
RCLK
RTS
U1MCR
U1RX
NRXRDY
RXD1
INTERRUPT
U1IER
U1RBR
U1RSR
U1INTR
U1IIR
U1FCR
U1LSR
U1LCR
U1SCR
PA[2:0]
PSEL
PSTB
PWRITE
PD[7:0]
AR
APB
INTERFACE
DDIS
MR
PCLK
Fig 72. UART1 block diagram
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Chapter 18: LPC24XX CAN controllers CAN1/2
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1. How to read this chapter
The CAN controller in available on parts LPC2458 and LPC2460/68/70/78.
2. Basic configuration
The CAN1/2 peripherals are configured using the following registers:
Remark: On reset, the CAN1/2 blocks are disabled (PCAN1/2 = 0).
for the acceptance filter, PCLK_ACF.
wake up the microcontroller from Power-down mode.
4. Pins: Select CAN1/2 pins and pin modes in registers PINSELn and PINMODEn (see
5. Interrupts: CAN interrupts are enabled using the CAN1/2IER registers
3. CAN controllers
Controller Area Network (CAN) is the definition of a high performance communication
protocol for serial data communication. The CAN Controller is designed to provide a full
implementation of the CAN-Protocol according to the CAN Specification Version 2.0B.
Microcontrollers with this on-chip CAN controller are used to build powerful local networks
by supporting distributed real-time control with a very high level of security. The
applications are automotive, industrial environments, and high speed networks as well as
low cost multiplex wiring. The result is a strongly reduced wiring harness and enhanced
diagnostic and supervisory capabilities.
The CAN block is intended to support multiple CAN buses simultaneously, allowing the
device to be used as a gateway, switch, or router among a number of CAN buses in
various applications.
The CAN module consists of two elements: the controller and the Acceptance Filter. All
registers and the RAM are accessed as 32 bit words.
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Chapter 18: LPC24XX CAN controllers CAN1/2
4. Features
4.1 General CAN features
• Compatible with CAN specification 2.0B, ISO 11898-1.
• Multi-master architecture with non destructive bit-wise arbitration.
• Bus access priority determined by the message identifier (11-bit or 29-bit).
• Guaranteed latency time for high priority messages.
• Programmable transfer rate (up to 1 Mbit/s).
• Multicast and broadcast message facility.
• Data length from 0 up to 8 bytes.
• Powerful error handling capability.
• Non-return-to-zero (NRZ) coding/decoding with bit stuffing.
4.2 CAN controller features
• 2 CAN controllers and buses.
• Supports 11-bit identifier as well as 29-bit identifier.
• Double Receive Buffer and Triple Transmit Buffer.
• Programmable Error Warning Limit and Error Counters with read/write access.
• Arbitration Lost Capture and Error Code Capture with detailed bit position.
• Single Shot Transmission (no re-transmission).
• Listen Only Mode (no acknowledge, no active error flags).
• Reception of "own" messages (Self Reception Request).
4.3 Acceptance filter features
• Fast hardware implemented search algorithm supporting a large number of CAN
identifiers.
• Global Acceptance Filter recognizes 11 and 29 bit Rx Identifiers for all CAN buses.
• Allows definition of explicit and groups for 11-bit and 29-bit CAN identifiers.
• Acceptance Filter can provide FullCAN-style automatic reception for selected
Standard Identifiers.
5. Pin description
Table 415. CAN Pin descriptions
Pin Name
RD1, RD2
TD1, TD2
Type
Description
Input
Serial Inputs. From CAN transceivers.
Serial Outputs. To CAN transceivers.
Output
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Chapter 18: LPC24XX CAN controllers CAN1/2
6. CAN controller architecture
The CAN Controller is a complete serial interface with both Transmit and Receive Buffers
but without Acceptance Filter. CAN Identifier filtering is done for all CAN channels in a
separate block (Acceptance Filter). Except for message buffering and acceptance filtering
the functionality is similar to the PeliCAN concept.
The CAN Controller Block includes interfaces to the following blocks:
• APB Interface
• Acceptance Filter
• Vectored Interrupt Controller (VIC)
• CAN Transceiver
• Common Status Registers
INTERFACE
MANAGEMENT
LOGIC
CAN CORE
BLOCK
APB BUS
TX
RX
ERROR
MANAGEMENT
LOGIC
CAN
TRANSCEIVER
VIC
TRANSMIT
BUFFERS 1,2
AND 3
BIT
TIMING
LOGIC
COMMON
STATUS
REGISTER
BIT
STREAM
PROCESSOR
RECEIVE
BUFFERS 1
AND 2
ACCEPTANCE
FILTER
Fig 73. CAN controller block diagram
6.1 APB Interface Block (AIB)
The APB Interface Block provides access to all CAN Controller registers.
6.2 Interface Management Logic (IML)
The Interface Management Logic interprets commands from the CPU, controls internal
addressing of the CAN Registers and provides interrupts and status information to the
CPU.
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Chapter 18: LPC24XX CAN controllers CAN1/2
6.3 Transmit Buffers (TXB)
The TXB represents a Triple Transmit Buffer, which is the interface between the Interface
Management Logic (IML) and the Bit Stream Processor (BSP). Each Transmit Buffer is
able to store a complete message which can be transmitted over the CAN network. This
buffer is written by the CPU and read out by the BSP.
31
24 23
16 15
8 7
0
TX
Frame info
unused TX DLC
. . .
unused
TX Priority
ID.28 ... ID.18
TFS
TID
Descriptor
Field
0
0
TX Data 4
TX Data 8
TX Data 3
TX Data 7
TX Data 2
TX Data 6
TX Data 1
TX Data 5
TDA
TDB
Data Field
Standard Frame Format (11-bit Identifier)
31
24 23
16 15
8 7
0
TX
Frame info
unused TX DLC
unused
TX Priority
ID.00
TFS
TID
Descriptor
Field
0 0 0 ID.28
TX Data 4
...
TX Data 3
TX Data 7
TX Data 2
TX Data 6
TX Data 1
TX Data 5
TDA
TDB
Data Field
TX Data 8
Extended Frame Format (29-bit Identifier)
Fig 74. Transmit buffer layout for standard and extended frame format configurations
6.4 Receive Buffer (RXB)
The Receive Buffer (RXB) represents a CPU accessible Double Receive Buffer. It is
located between the CAN Controller Core Block and APB Interface Block and stores all
received messages from the CAN Bus line. With the help of this Double Receive Buffer
concept the CPU is able to process one message while another message is being
received.
The global layout of the Receive Buffer is very similar to the Transmit Buffer described
earlier. Identifier, Frame Format, Remote Transmission Request bit and Data Length
Code have the same meaning as described for the Transmit Buffer. In addition, the
The received Data Length Code represents the real transmitted Data Length Code, which
may be greater than 8 depending on transmitting CAN node. Nevertheless, the maximum
number of received data bytes is 8. This should be taken into account by reading a
message from the Receive Buffer. If there is not enough space for a new message within
the Receive Buffer, the CAN Controller generates a Data Overrun condition when this
message becomes valid and the acceptance test was positive. A message that is partly
written into the Receive Buffer (when the Data Overrun situation occurs) is deleted. This
situation is signalled to the CPU via the Status Register and the Data Overrun Interrupt, if
enabled.
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Chapter 18: LPC24XX CAN controllers CAN1/2
31
24 23
16 15
10
9
8
7
0
RX
Frame info
unused RX DLC
unused
RX Data 3
RX Data 7
unused
ID Index
RFS
RID
Descriptor
Field
ID.28 ... ID.18
RX Data 1
RX Data 4
RX Data 8
RX Data 2
RX Data 6
RDA
RDB
Data Field
RX Data 5
BPM=bypass
message
Standard Frame Format (11-bit Identifier)
31
24 23
16 15
10
9
8
7
0
RX
Frame info
ID.28
unused RX DLC
unused
ID Index
ID.00
RFS
RID
Descriptor
Field
unused
...
RX Data 4
RX Data 8
RX Data 3
RX Data 7
RX Data 2
RX Data 6
RX Data 1
RX Data 5
RDA
RDB
Data Field
Extended Frame Format (29-bit Identifier)
Fig 75. Receive buffer layout for standard and extended frame format configurations
6.5 Error Management Logic (EML)
The EML is responsible for the error confinement. It gets error announcements from the
BSP and then informs the BSP and IML about error statistics.
6.6 Bit Timing Logic (BTL)
The Bit Timing Logic monitors the serial CAN Bus line and handles the Bus line related bit
timing. It synchronizes to the bit stream on the CAN Bus on a "recessive" to "dominant"
Bus line transition at the beginning of a message (hard synchronization) and
re-synchronizes on further transitions during the reception of a message (soft
synchronization). The BTL also provides programmable time segments to compensate for
the propagation delay times and phase shifts (e.g. due to oscillator drifts) and to define the
sample point and the number of samples to be taken within a bit time.
6.7 Bit Stream Processor (BSP)
The Bit Stream Processor is a sequencer, controlling the data stream between the
Transmit Buffer, Receive Buffers and the CAN Bus. It also performs the error detection,
arbitration, stuffing and error handling on the CAN Bus.
6.8 CAN controller self-tests
The CAN controller of the LPC2000 family supports two different options for self-tests:
• Global Self-Test (setting the self reception request bit in normal Operating Mode)
• Local Self-Test (setting the self reception request bit in Self Test Mode)
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Chapter 18: LPC24XX CAN controllers CAN1/2
Both self-tests are using the ‘Self Reception’ feature of the CAN Controller. With the Self
Reception Request, the transmitted message is also received and stored in the receive
buffer. Therefore the acceptance filter has to be configured accordingly. As soon as the
CAN message is transmitted, a transmit and a receive interrupt are generated, if enabled.
Global self test
A Global Self-Test can for example be used to verify the chosen configuration of the CAN
node, which is acknowledging each CAN message has to be connected to the CAN bus.
CAN Bus
TX Buffer
Transceiver
LPC24xx
ack
RX Buffer
Fig 76. Global Self-Test (high-speed CAN Bus example)
Initiating a Global Self-Test is similar to a normal CAN transmission. In this case the
transmission of a CAN message(s) is initiated by setting Self Reception Request bit
(SRR) in conjunction with the selected Message Buffer bits (STB3, STB2, STB1) in the
CAN Controller Command register (CANCMR).
Local self test
The Local Self-Test perfectly fits for single node tests. In this case an acknowledge from
other nodes is not needed. As shown in the Figure below, a CAN transceiver with an
appropriate CAN bus termination has to be connected to the LPC. The CAN Controller
has to be put into the 'Self Test Mode' by setting the STM bit in the CAN Controller Mode
register (CANMOD). Hint: Setting the Self Test Mode bit (STM) is possible only when the
CAN Controller is in Reset Mode.
TX Buffer
Transceiver
LPC24xx
RX Buffer
Fig 77. Local self test (high-speed CAN Bus example)
A message transmission is initiated by setting Self Reception Request bit (SRR) in
conjunction with the selected Message Buffer(s) (STB3, STB2, STB1).
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Chapter 18: LPC24XX CAN controllers CAN1/2
7. Memory map of the CAN block
The CAN Controllers and Acceptance Filter occupy a number of APB slots, as follows:
Table 416. Memory map of the CAN block
Address Range
Used for
0xE003 8000 - 0xE003 87FF
0xE003 C000 - 0xE003 C017
0xE004 0000 - 0xE004 000B
0xE004 4000 - 0xE004 405F
0xE004 8000 - 0xE004 805F
Acceptance Filter RAM.
Acceptance Filter Registers.
Central CAN Registers.
CAN Controller 1 Registers.
CAN Controller 2 Registers.
8. Register description
detailed descriptions follow.
Table 417. Summary of CAN acceptance filter and central CAN registers
Name
Description
Access Reset Value Address
AFMR
SFF_sa
Acceptance Filter Register
R/W
R/W
R/W
R/W
R/W
R/W
RO
1
0
0
0
0
0
0
0
0
0
0
0xE003 C000
0xE003 C004
0xE003 C008
0xE003 C00C
0xE003 C010
0xE003 C014
0xE003 C018
0xE003 C01C
0xE003 C020
0xE003 C024
0xE003 C028
Standard Frame Individual Start Address Register
SFF_GRP_sa Standard Frame Group Start Address Register
EFF_sa Extended Frame Start Address Register
EFF_GRP_sa Extended Frame Group Start Address Register
ENDofTable
LUTerrAd
LUTerr
End of AF Tables register
LUT Error Address register
LUT Error Register
RO
FCANIE
FullCAN interrupt enable register
FullCAN interrupt and capture register 0
FullCAN interrupt and capture register 1
CAN Central Transmit Status Register
CAN Central Receive Status Register
CAN Central Miscellaneous Register
R/W
R/W
R/W
RO
FCANIC0
FCANIC1
CANTxSR
CANRxSR
CANMSR
0x0003 0300 0xE004 0000
RO
0
0
0xE004 0004
0xE004 0008
RO
Table 418. Summary of CAN1 and CAN2 controller registers
Generic Description
Name
Access CAN1 Register
Address & Name
CAN2 Register
Address & Name
MOD
Controls the operating mode of the CAN
Controller.
R/W
CAN1MOD - 0xE004 4000 CAN2MOD - 0xE004 8000
CAN1CMR - 0xE004 4004 CAN2CMR - 0xE004 8004
CAN1GSR - 0xE004 4008 CAN2GSR - 0xE004 8008
CMR
Command bits that affect the state of the
CAN Controller
WO
GSR
ICR
Interrupt status, Arbitration Lost Capture,
Error Code Capture
RO
CAN1ICR - 0xE004 400C
CAN2ICR - 0xE004 800C
IER
Interrupt Enable
Bus Timing
R/W
R/W[2]
CAN1IER - 0xE004 4010
CAN2IER - 0xE004 8010
BTR
CAN1BTR - 0xE004 4014 CAN2BTR - 0xE004 8014
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 418. Summary of CAN1 and CAN2 controller registers
Generic Description
Name
Access CAN1 Register
Address & Name
CAN2 Register
Address & Name
EWL
SR
Error Warning Limit
R/W[2]
CAN1EWL - 0xE004 4018 CAN2EWL - 0xE004 8018
CAN1SR - 0xE004 401C CAN2SR - 0xE004 801C
CAN1RFS - 0xE004 4020 CAN2RFS - 0xE004 8020
CAN1RID - 0xE004 4024 CAN2RID - 0xE004 8024
Status Register
RO
RFS
RID
Receive frame status
R/W[2]
R/W[2]
R/W[2]
R/W[2]
R/W
Received Identifier
RDA
RDB
TFI1
TID1
TDA1
TDB1
Received data bytes 1-4
Received data bytes 5-8
Transmit frame info (Tx Buffer 1)
Transmit Identifier (Tx Buffer 1)
Transmit data bytes 1-4 (Tx Buffer 1)
Transmit data bytes 5-8 (Tx Buffer 1)
CAN1RDA - 0xE004 4028 CAN2RDA - 0xE004 8028
CAN1RDB - 0xE004 402C CAN2RDB - 0xE004 802C
CAN1TFI1 - 0xE004 4030 CAN2TFI1 - 0xE004 8030
CAN1TID1 - 0xE004 4034 CAN2TID1 - 0xE004 8034
CAN1TDA1 - 0xE004 4038 CAN2TDA1 - 0xE004 8038
R/W
R/W
R/W
CAN1TDB1- 0xE004 403C CAN1TDB1 - 0xE004 403C
CAN2TDB1- 0xE004 803C CAN2TDB1 - 0xE004 803C
TFI2
Transmit frame info (Tx Buffer 2)
Transmit Identifier (Tx Buffer 2)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
CAN1TFI2 - 0xE004 4040 CAN1TFI2 - 0xE004 4040
CAN2TFI2 - 0xE004 8040 CAN2TFI2 - 0xE004 8040
TID2
TDA2
TDB2
TFI3
CAN1TID2 - 0xE004 4044 CAN1TID2 - 0xE004 4044
CAN2TID2 - 0xE004 8044 CAN2TID2 - 0xE004 8044
Transmit data bytes 1-4 (Tx Buffer 2)
Transmit data bytes 5-8 (Tx Buffer 2)
Transmit frame info (Tx Buffer 3)
Transmit Identifier (Tx Buffer 3)
CAN1TDA2 - 0xE004 4048 CAN1TDA2 - 0xE004 4048
CAN2TDA2 - 0xE004 8048 CAN2TDA2 - 0xE004 8048
CAN1TDB2 - 0xE004 404C CAN1TDB2 - 0xE004 404C
CAN2TDB2 - 0xE004 804C CAN2TDB2 - 0xE004 804C
CAN1TFI3 - 0xE004 4050 CAN1TFI3 - 0xE004 4050
CAN2TFI3 - 0xE004 8050 CAN2TFI3 - 0xE004 8050
TID3
TDA3
TDB3
CAN1TID3 - 0xE004 4054 CAN1TID3 - 0xE004 4054
CAN2TID3 - 0xE004 8054 CAN2TID3 - 0xE004 8054
Transmit data bytes 1-4 (Tx Buffer 3)
Transmit data bytes 5-8 (Tx Buffer 3)
CAN1TDA3 - 0xE004 4058 CAN1TDA3 - 0xE004 4058
CAN2TDA3 - 0xE004 8058 CAN2TDA3 - 0xE004 8058
CAN1TDB3 - 0xE004 405C CAN1TDB3 - 0xE004 405C
CAN2TDB3 - 0xE004 805C CAN2TDB3 - 0xE004 805C
[1] The error counters can only be written when RM in CANMOD is 1.
[2] These registers can only be written when RM in CANMOD is 1.
The internal registers of each CAN Controller appear to the CPU as on-chip memory
mapped peripheral registers. Because the CAN Controller can operate in different modes
(Operating/Reset, see also Section 18–8.1 “Mode Register (CAN1MOD - 0xE004 4000,
CAN2MOD - 0xE004 8000)”), one has to distinguish between different internal address
definitions. Note that write access to some registers is only allowed in Reset Mode.
Table 419. Access to CAN1 and CAN2 controller registers
Generic Operating Mode
Reset Mode
Read
Name
Read
Write
Mode
Command
-
Write
MOD
CMR
GSR
Mode
0x00
Mode
Mode
0x00
Command
Error Counters only
Global Status and Error
Counters
Global Status and Error
Counters
ICR
Interrupt and Capture
-
Interrupt and Capture
-
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 419. Access to CAN1 and CAN2 controller registers
Generic Operating Mode
Name
Reset Mode
Read
Write
Read
Write
IER
Interrupt Enable
Bus Timing
Error Warning Limit
Status
Interrupt Enable
Interrupt Enable
Bus Timing
Error Warning Limit
Status
Interrupt Enable
Bus Timing
Error Warning Limit
-
BTR
EWL
SR
-
-
-
RFS
RID
Rx Info and Index
Rx Identifier
Rx Data
-
Rx Info and Index
Rx Identifier
Rx Data
Rx Info and Index
Rx Identifier
Rx Data
-
RDA
RDB
TFI1
TID1
TDA1
TDB1
-
Rx Info and Index
Tx Info1
-
Rx Info and Index
Tx Info
Rx Info and Index
Tx Info
Tx Info
Tx Identifier
Tx Data
Tx Data
Tx Identifier
Tx Data
Tx Identifier
Tx Data
Tx Identifier
Tx Data
Tx Data
Tx Data
Tx Data
In the following register tables, the column “Reset Value” shows how a hardware reset
affects each bit or field, while the column “RM Set” indicates how each bit or field is
affected if software sets the RM bit, or RM is set because of a Bus-Off condition. Note that
while hardware reset sets RM, in this case the setting noted in the “Reset Value” column
prevails over that shown in the “RM Set” column, in the few bits where they differ. In both
columns, X indicates the bit or field is unchanged.
8.1 Mode Register (CAN1MOD - 0xE004 4000, CAN2MOD - 0xE004 8000)
The contents of the Mode Register are used to change the behavior of the CAN
Controller. Bits may be set or reset by the CPU that uses the Mode Register as a
read/write memory. Reserved Bits are read as 0 and should be written as 0.
Table 420. Mode register (CAN1MOD - address 0xE004 4000, CAN2MOD - address 0xE004 8000) bit description
Bit Symbol Value
Function
Reset RM
Value Set
0
Reset Mode.
1
1
0(normal)
1(reset)
The CAN Controller is in the Operating Mode, and certain registers can not be
written.
CAN operation is disabled, writable registers can be written and the current
transmission/reception of a message is aborted.
1
Listen Only Mode.
0
x
0(normal)
The CAN controller acknowledges a successfully received message on the
CAN bus. The error counters are stopped at the current value.
1(listen only) The controller gives no acknowledgment, even if a message is successfully
received. Messages cannot be sent, and the controller operates in “error
passive” mode. This mode is intended for software bit rate detection and “hot
plugging”.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 420. Mode register (CAN1MOD - address 0xE004 4000, CAN2MOD - address 0xE004 8000) bit description
Bit Symbol Value
Function
Reset RM
Value Set
2
Self Test Mode.
0
x
0(normal)
1(self test)
A transmitted message must be acknowledged to be considered successful.
The controller will consider a Tx message successful even if there is no
acknowledgment received.
In this mode a full node test is possible without any other active node on the bus
using the SRR bit in CANxCMR.
3
4
5
TPM[4]
SM[5]
RPM
Transmit Priority Mode.
0
0
0
x
0
x
0(CAN ID)
The transmit priority for 3 Transmit Buffers depends on the CAN Identifier.
1(local prio)
The transmit priority for 3 Transmit Buffers depends on the contents of the Tx
Priority register within the Transmit Buffer.
Sleep Mode.
0(wake-up)
1(sleep)
Normal operation.
The CAN controller enters Sleep Mode if no CAN interrupt is pending and there
Receive Polarity Mode.
0(low active) RD input is active Low (dominant bit = 0).
1(high active) RD input is active High (dominant bit = 1) -- reverse polarity.
6
7
-
-
Reserved, user software should not write ones to reserved bits.
0
0
0
x
TM
Test Mode.
0(disabled)
1(enabled)
Normal operation.
The TD pin will reflect the bit, detected on RD pin, with the next positive edge of
the system clock.
[1] During a Hardware reset or when the Bus Status bit is set '1' (Bus-Off), the Reset Mode bit is set '1' (present). After the Reset Mode bit
is set '0' the CAN Controller will wait for:
- one occurrence of Bus-Free signal (11 recessive bits), if the preceding reset has been caused by a Hardware reset or a CPU-initiated
reset.
- 128 occurrences of Bus-Free, if the preceding reset has been caused by a CAN Controller initiated Bus-Off, before re-entering the
Bus-On mode.
[2] This mode of operation forces the CAN Controller to be error passive. Message Transmission is not possible. The Listen Only Mode can
be used e.g. for software driven bit rate detection and "hot plugging".
[3] A write access to the bits MOD.1 and MOD.2 is possible only if the Reset Mode is entered previously.
[5] The CAN Controller will enter Sleep Mode, if the Sleep Mode bit is set '1' (sleep), there is no bus activity, and none of the CAN interrupts
is pending. Setting of SM with at least one of the previously mentioned exceptions valid will result in a wake-up interrupt. The CAN
Controller will wake up if SM is set LOW (wake-up) or there is bus activity. On wake-up, a Wake-up Interrupt is generated. A sleeping
CAN Controller which wakes up due to bus activity will not be able to receive this message until it detects 11 consecutive recessive bits
(Bus-Free sequence). Note that setting of SM is not possible in Reset Mode. After clearing of Reset Mode, setting of SM is possible only
when Bus-Free is detected again.
[6] The LOM and STM bits can only be written if the RM bit is 1 prior to the write operation.
8.2 Command Register (CAN1CMR - 0xE004 x004, CAN2CMR -
0xE004 8004)
Writing to this write-only register initiates an action within the transfer layer of the CAN
Controller. Bits not listed should be written as 0. Reading this register yields zeroes.
At least one internal clock cycle is needed for processing between two commands.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 421. Command Register (CAN1CMR - address 0xE004 4004, CAN2CMR - address 0xE004 8004) bit description
Bit
Symbol Value
Function
Reset RM
Value Set
Transmission Request.
No transmission request.
0
0
0 (absent)
1 (present)
The message, previously written to the CANxTFI, CANxTID, and
optionally the CANxTDA and CANxTDB registers, is queued for
transmission from the selected Transmit Buffer. If at two or all three
of STB1, STB2 and STB3 bits are selected when TR=1 is written,
Transmit Buffer will be selected based on the chosen priority
Abort Transmission.
0
0
0
0
0 (no action)
1 (present)
Do not abort the transmission.
if not already in progress, a pending Transmission Request for the
selected Transmit Buffer is cancelled.
2[4]
RRB
Release Receive Buffer.
0 (no action)
1 (released)
Do not release the receive buffer.
The information in the Receive Buffer (consisting of CANxRFS,
CANxRID, and if applicable the CANxRDA and CANxRDB registers)
is released, and becomes eligible for replacement by the next
received frame. If the next received frame is not available, writing
this command clears the RBS bit in the Status Register(s).
3[5]
CDO
Clear Data Overrun.
0
0
0
0
0 (no action)
1 (clear)
Do not clear the data overrun bit.
The Data Overrun bit in Status Register(s) is cleared.
Self Reception Request.
0 (absent)
1 (present)
No self reception request.
The message, previously written to the CANxTFS, CANxTID, and
optionally the CANxTDA and CANxTDB registers, is queued for
transmission from the selected Transmit Buffer and received
simultaneously. This differs from the TR bit above in that the receiver
is not disabled during the transmission, so that it receives the
message if its Identifier is recognized by the Acceptance Filter.
5
6
7
STB1
STB2
STB3
Select Tx Buffer 1.
0
0
0
0
0
0
0 (not selected)
1 (selected)
Tx Buffer 1 is not selected for transmission.
Tx Buffer 1 is selected for transmission.
Select Tx Buffer 2.
0 (not selected)
1 (selected)
Tx Buffer 2 is not selected for transmission.
Tx Buffer 2 is selected for transmission.
Select Tx Buffer 3.
0 (not selected)
1 (selected)
Tx Buffer 3 is not selected for transmission.
Tx Buffer 3 is selected for transmission.
[1] - Setting the command bits TR and AT simultaneously results in transmitting a message once. No re-transmission will be performed in
case of an error or arbitration lost (single shot transmission).
- Setting the command bits SRR and TR simultaneously results in sending the transmit message once using the self-reception feature.
No re-transmission will be performed in case of an error or arbitration lost.
- Setting the command bits TR, AT and SRR simultaneously results in transmitting a message once as described for TR and AT. The
moment the Transmit Status bit is set within the Status Register, the internal Transmission Request Bit is cleared automatically.
- Setting TR and SRR simultaneously will ignore the set SRR bit.
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Chapter 18: LPC24XX CAN controllers CAN1/2
[2] If the Transmission Request or the Self-Reception Request bit was set '1' in a previous command, it cannot be cancelled by resetting the
bits. The requested transmission may only be cancelled by setting the Abort Transmission bit.
[3] The Abort Transmission bit is used when the CPU requires the suspension of the previously requested transmission, e.g. to transmit a
more urgent message before. A transmission already in progress is not stopped. In order to see if the original message has been either
transmitted successfully or aborted, the Transmission Complete Status bit should be checked. This should be done after the Transmit
Buffer Status bit has been set to '1' or a Transmit Interrupt has been generated.
[4] After reading the contents of the Receive Buffer, the CPU can release this memory space by setting the Release Receive Buffer bit '1'.
This may result in another message becoming immediately available. If there is no other message available, the Receive Interrupt bit is
reset. If the RRB command is given, it will take at least 2 internal clock cycles before a new interrupt is generated.
[5] This command bit is used to clear the Data Overrun condition signalled by the Data Overrun Status bit. As long as the Data Overrun
Status bit is set no further Data Overrun Interrupt is generated.
[6] Upon Self Reception Request, a message is transmitted and simultaneously received if the Acceptance Filter is set to the corresponding
identifier. A receive and a transmit interrupt will indicate correct self reception (see also Self Test Mode in Section 18–8.1 “Mode
8.3 Global Status Register (CAN1GSR - 0xE004 x008, CAN2GSR -
0xE004 8008)
The content of the Global Status Register reflects the status of the CAN Controller. This
register is read-only, except that the Error Counters can be written when the RM bit in the
CANMOD register is 1. Bits not listed read as 0 and should be written as 0.
Table 422. Global Status Register (CAN1GSR - address 0xE004 4008, CAN2GSR - address 0xE004 8008) bit
description
Bit
Symbol Value
Function
Reset RM
Value Set
0
RBS[1]
Receive Buffer Status.
0
0
1
0
0
1
0 (empty)
No message is available.
1 (full)
At least one complete message is received by the Double Receive Buffer
and available in the CANxRFS, CANxRID, and if applicable the CANxRDA
and CANxRDB registers. This bit is cleared by the Release Receive Buffer
command in CANxCMR, if no subsequent received message is available.
1
2
DOS[2]
Data Overrun Status.
0 (absent)
1 (overrun)
No data overrun has occurred since the last Clear Data Overrun command
was given/written to CANxCMR (or since Reset).
A message was lost because the preceding message to this CAN controller
was not read and released quickly enough (there was not enough space for
a new message in the Double Receive Buffer).
TBS
Transmit Buffer Status.
0 (locked)
At least one of the Transmit Buffers is not available for the CPU, i.e. at least
one previously queued message for this CAN controller has not yet been
sent, and therefore software should not write to the CANxTFI, CANxTID,
CANxTDA, nor CANxTDB registers of that (those) Tx buffer(s).
1 (released)
All three Transmit Buffers are available for the CPU. No transmit message is
pending for this CAN controller (in any of the 3 Tx buffers), and software may
write to any of the CANxTFI, CANxTID, CANxTDA, and CANxTDB registers.
3
TCS[3]
Transmit Complete Status.
1
x
0 (incomplete) At least one requested transmission has not been successfully completed
yet.
1 (complete) All requested transmission(s) has (have) been successfully completed.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 422. Global Status Register (CAN1GSR - address 0xE004 4008, CAN2GSR - address 0xE004 8008) bit
description
Bit
Symbol Value
Function
Reset RM
Value Set
4
RS[4]
Receive Status.
1
1
0
0
0
0
0 (idle)
The CAN controller is idle.
1 (receive)
The CAN controller is receiving a message.
Transmit Status.
5
6
TS[4]
ES[5]
0 (idle)
The CAN controller is idle.
1 (transmit)
The CAN controller is sending a message.
Error Status.
0 (ok)
Both error counters are below the Error Warning Limit.
1 (error)
One or both of the Transmit and Receive Error Counters has reached the
limit set in the Error Warning Limit register.
7
BS[6]
Bus Status.
0
0
0 (Bus-On)
1 (Bus-Off)
The CAN Controller is involved in bus activities
The CAN controller is currently not involved/prohibited from bus activity
because the Transmit Error Counter reached its limiting value of 255.
15:8
-
-
Reserved, user software should not write ones to reserved bits. The value
read from a reserved bit is not defined.
NA
23:16 RXERR -
31:24 TXERR
The current value of the Rx Error Counter (an 8 - bit value).
The current value of the Tx Error Counter (an 8 - bit value).
0
0
X
X
-
[1] After reading all messages and releasing their memory space with the command 'Release Receive Buffer,' this bit is cleared.
[2] If there is not enough space to store the message within the Receive Buffer, that message is dropped and the Data Overrun condition is
signalled to the CPU in the moment this message becomes valid. If this message is not completed successfully (e.g. because of an
error), no overrun condition is signalled.
[3] The Transmission Complete Status bit is set '0' (incomplete) whenever the Transmission Request bit or the Self Reception Request bit
is set '1' at least for one of the three Transmit Buffers. The Transmission Complete Status bit will remain '0' until all messages are
transmitted successfully.
[4] If both the Receive Status and the Transmit Status bits are '0' (idle), the CAN-Bus is idle. If both bits are set, the controller is waiting to
become idle again. After hardware reset 11 consecutive recessive bits have to be detected until idle status is reached. After Bus-off this
will take 128 times of 11 consecutive recessive bits.
[5] Errors detected during reception or transmission will effect the error counters according to the CAN specification. The Error Status bit is
set when at least one of the error counters has reached or exceeded the Error Warning Limit. An Error Warning Interrupt is generated, if
enabled. The default value of the Error Warning Limit after hardware reset is 96 decimal, see also Section 18–8.7 “Error Warning Limit
[6] Mode bit '1' (present) and an Error Warning Interrupt is generated, if enabled. Afterwards the Transmit Error Counter is set to '127', and
the Receive Error Counter is cleared. It will stay in this mode until the CPU clears the Reset Mode bit. Once this is completed the CAN
Controller will wait the minimum protocol-defined time (128 occurrences of the Bus-Free signal) counting down the Transmit Error
Counter. After that, the Bus Status bit is cleared (Bus-On), the Error Status bit is set '0' (ok), the Error Counters are reset, and an Error
Warning Interrupt is generated, if enabled. Reading the TX Error Counter during this time gives information about the status of the
Bus-Off recovery.
RX error counter
The RX Error Counter Register, which is part of the Status Register, reflects the current
value of the Receive Error Counter. After hardware reset this register is initialized to 0. In
Operating Mode this register appears to the CPU as a read only memory. A write access
to this register is possible only in Reset Mode. If a Bus Off event occurs, the RX Error
Counter is initialized to 0. As long as Bus Off is valid, writing to this register has no
effect.The Rx Error Counter is determined as follows:
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Chapter 18: LPC24XX CAN controllers CAN1/2
RX Error Counter = (CANxGSR AND 0x00FF0000) / 0x00010000
Note that a CPU-forced content change of the RX Error Counter is possible only if the
Reset Mode was entered previously. An Error Status change (Status Register), an Error
Warning or an Error Passive Interrupt forced by the new register content will not occur
until the Reset Mode is cancelled again.
TX error counter
The TX Error Counter Register, which is part of the Status Register, reflects the current
value of the Transmit Error Counter. In Operating Mode this register appears to the CPU
as a read only memory. After hardware reset this register is initialized to ’0’. A write access
to this register is possible only in Reset Mode. If a bus-off event occurs, the TX Error
Counter is initialized to 127 to count the minimum protocol-defined time (128 occurrences
of the Bus-Free signal). Reading the TX Error Counter during this time gives information
about the status of the Bus-Off recovery. If Bus Off is active, a write access to TXERR in
the range of 0 to 254 clears the Bus Off Flag and the controller will wait for one occurrence
of 11 consecutive recessive bits (bus free) after clearing of Reset Mode. The Tx error
counter is determined as follows:
TX Error Counter = (CANxGSR AND 0xFF000000) / 0x01000000
Writing 255 to TXERR allows initiation of a CPU-driven Bus Off event. Note that a
CPU-forced content change of the TX Error Counter is possible only if the Reset Mode
was entered previously. An Error or Bus Status change (Status Register), an Error
Warning, or an Error Passive Interrupt forced by the new register content will not occur
until the Reset Mode is cancelled again. After leaving the Reset Mode, the new TX
Counter content is interpreted and the Bus Off event is performed in the same way as if it
was forced by a bus error event. That means, that the Reset Mode is entered again, the
TX Error Counter is initialized to 127, the RX Counter is cleared, and all concerned Status
and Interrupt Register Bits are set. Clearing of Reset Mode now will perform the protocol
defined Bus Off recovery sequence (waiting for 128 occurrences of the Bus-Free signal).
If the Reset Mode is entered again before the end of Bus Off recovery (TXERR>0), Bus
Off keeps active and TXERR is frozen.
8.4 Interrupt and Capture Register (CAN1ICR - 0xE004 400C, CAN2ICR -
0xE004 800C)
Bits in this register indicate information about events on the CAN bus. This register is
read-only. Bits not listed read as 0 and should be written as 0.
The Interrupt flags of the Interrupt and Capture Register allow the identification of an
interrupt source. When one or more bits are set, a CAN interrupt will be indicated to the
CPU. After this register is read from the CPU all interrupt bits are reset except of the
Receive Interrupt bit. The Interrupt Register appears to the CPU as a read only memory.
Bits 1 thru 10 clear when they are read.
Bits 16-23 are captured when a bus error occurs. At the same time, if the BEIE bit in
CANIER is 1, the BEI bit in this register is set, and a CAN interrupt can occur.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Bits 24-31 are captured when CAN arbitration is lost. At the same time, if the ALIE bit in
CANIER is 1, the ALI bit in this register is set, and a CAN interrupt can occur. Once either
of these bytes is captured, its value will remain the same until it is read, at which time it is
released to capture a new value.
The clearing of bits 1 to 10 and the releasing of bits 16-23 and 24-31 all occur on any read
from CANxICR, regardless of whether part or all of the register is read. This means that
software should always read CANxICR as a word, and process and deal with all bits of the
register as appropriate for the application.
Table 423. Interrupt and Capture Register (CAN1ICR - address 0xE004 400C, CAN2ICR -
address 0xE004 800C) bit description
Bit
Symbol
Value
Function
Reset RM
Value Set
0
RI[1]
0 (reset) Receive Interrupt. This bit is set whenever the RBS bit
0
0
1 (set)
in CANxSR and the RIE bit in CANxIER are both 1,
indicating that a new message was received and
stored in the Receive Buffer.
1
2
TI1
EI
0 (reset) Transmit Interrupt 1. This bit is set when the TBS1 bit
0
0
1 (set)
in CANxSR goes from 0 to 1 (whenever a message
out of TXB1 was successfully transmitted or aborted),
indicating that Transmit buffer 1 is available, and the
TIE1 bit in CANxIER is 1.
0 (reset) Error Warning Interrupt. This bit is set on every
0
X
1 (set)
change (set or clear) of either the Error Status or Bus
Status bit in CANxSR and the EIE bit bit is set within
the Interrupt Enable Register at the time of the
change.
3
4
5
DOI
0 (reset) Data Overrun Interrupt. This bit is set when the DOS
0
0
0
0
0
0
1 (set)
bit in CANxSR goes from 0 to 1 and the DOIE bit in
CANxIER is 1.
WUI[2]
EPI
0 (reset) Wake-Up Interrupt. This bit is set if the CAN controller
1 (set)
is sleeping and bus activity is detected and the WUIE
bit in CANxIER is 1.
0 (reset) Error Passive Interrupt. This bit is set if the EPIE bit in
1 (set)
CANxIER is 1, and the CAN controller switches
between Error Passive and Error Active mode in
either direction.
This is the case when the CAN Controller has reached
the Error Passive Status (at least one error counter
exceeds the CAN protocol defined level of 127) or if
the CAN Controller is in Error Passive Status and
enters the Error Active Status again.
6
7
ALI
BEI
0 (reset) Arbitration Lost Interrupt. This bit is set if the ALIE bit
0
0
0
1 (set)
in CANxIER is 1, and the CAN controller loses
arbitration while attempting to transmit. In this case
the CAN node becomes a receiver.
0 (reset) Bus Error Interrupt -- this bit is set if the BEIE bit in
X
1 (set)
CANxIER is 1, and the CAN controller detects an error
on the bus.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 423. Interrupt and Capture Register (CAN1ICR - address 0xE004 400C, CAN2ICR -
address 0xE004 800C) bit description
Bit
Symbol
Value
Function
Reset RM
Value Set
8
IDI
0 (reset) ID Ready Interrupt -- this bit is set if the IDIE bit in
0
0
1 (set)
CANxIER is 1, and a CAN Identifier has been
received (a message was successfully transmitted or
aborted). This bit is set whenever a message was
successfully transmitted or aborted and the IDIE bit is
set in the IER reg.
9
TI2
TI3
-
0 (reset) Transmit Interrupt 2. This bit is set when the TBS2 bit
0
0
0
0
0
0
1 (set)
in CANxSR goes from 0 to 1 (whenever a message
out of TXB2 was successfully transmitted or aborted),
indicating that Transmit buffer 2 is available, and the
TIE2 bit in CANxIER is 1.
10
0 (reset) Transmit Interrupt 3. This bit is set when the TBS3 bit
1 (set)
in CANxSR goes from 0 to 1 (whenever a message
out of TXB3 was successfully transmitted or aborted),
indicating that Transmit buffer 3 is available, and the
TIE3 bit in CANxIER is 1.
15:11
-
Reserved, user software should not write ones to
reserved bits.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 423. Interrupt and Capture Register (CAN1ICR - address 0xE004 400C, CAN2ICR -
address 0xE004 800C) bit description
Bit
Symbol
Value
Function
Reset RM
Value Set
20:16 ERRBIT
4:0[3]
Error Code Capture: when the CAN controller detects
a bus error, the location of the error within the frame is
captured in this field. The value reflects an internal
state variable, and as a result is not very linear:
0
X
00011
00010
00110
00100
00101
00111
01111
01110
01100
01101
01001
01011
01010
01000
11000
11001
11011
11010
10010
10001
10110
10011
10111
11100
Start of Frame
ID28 ... ID21
ID20 ... ID18
SRTR Bit
IDE bit
ID17 ... 13
ID12 ... ID5
ID4 ... ID0
RTR Bit
Reserved Bit 1
Reserved Bit 0
Data Length Code
Data Field
CRC Sequence
CRC Delimiter
Acknowledge Slot
Acknowledge Delimiter
End of Frame
Intermission
Active Error Flag
Passive Error Flag
Tolerate Dominant Bits
Error Delimiter
Overload flag
21
ERRDIR
When the CAN controller detects a bus error, the
direction of the current bit is captured in this bit.
0
0
X
X
0
1
Error occurred during transmitting.
Error occurred during receiving.
23:22 ERRC1:0
When the CAN controller detects a bus error, the type
of error is captured in this field:
00
01
10
11
Bit error
Form error
Stuff error
Other error
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 423. Interrupt and Capture Register (CAN1ICR - address 0xE004 400C, CAN2ICR -
address 0xE004 800C) bit description
Bit
Symbol
Value
Function
Reset RM
Value Set
31:24 ALCBIT[4]
-
Each time arbitration is lost while trying to send on the
CAN, the bit number within the frame is captured into
this field. After the content of ALCBIT is read, the ALI
bit is cleared and a new Arbitration Lost interrupt can
occur.
0
X
00
...
arbitration lost in the first bit (MS) of identifier
a
11
arbitration lost in SRTS bit (RTR bit for standard frame
messages)
12
13
arbitration lost in IDE bit
arbitration lost in 12th bit of identifier (extended frame
only)
...
30
arbitration lost in last bit of identifier (extended frame
only)
31
arbitration lost in RTR bit (extended frame only)
[1] The Receive Interrupt Bit is not cleared upon a read access to the Interrupt Register. Giving the Command
“Release Receive Buffer” will clear RI temporarily. If there is another message available within the Receive
Buffer after the release command, RI is set again. Otherwise RI remains cleared.
[2] A Wake-Up Interrupt is also generated if the CPU tries to set the Sleep bit while the CAN controller is
involved in bus activities or a CAN Interrupt is pending. The WUI flag can also get asserted when the
according enable bit WUIE is not set. In this case a Wake-Up Interrupt does not get asserted.
[3] Whenever a bus error occurs, the corresponding bus error interrupt is forced, if enabled. At the same time,
the current position of the Bit Stream Processor is captured into the Error Code Capture Register. The
content within this register is fixed until the user software has read out its content once. From now on, the
capture mechanism is activated again, i.e. reading the CANxICR enables another Bus Error Interrupt.
[4] On arbitration lost, the corresponding arbitration lost interrupt is forced, if enabled. At that time, the current
bit position of the Bit Stream Processor is captured into the Arbitration Lost Capture Register. The content
within this register is fixed until the user application has read out its contents once. From now on, the
capture mechanism is activated again.
8.5 Interrupt Enable Register (CAN1IER - 0xE004 4010, CAN2IER -
0xE004 8010)
This read/write register controls whether various events on the CAN controller will result in
an interrupt or not. Bits 10:0 in this register correspond 1-to-1 with bits 10:0 in the
CANxICR register. If a bit in the CANxIER register is 0 the corresponding interrupt is
disabled; if a bit in the CANxIER register is 1 the corresponding source is enabled to
trigger an interrupt.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 424. Interrupt Enable Register (CAN1IER - address 0xE004 4010, CAN2IER - address
0xE004 8010) bit description
Bit
Symbol Function
Reset RM
Value Set
0
RIE
Receiver Interrupt Enable. When the Receive Buffer Status is 'full',
0
X
the CAN Controller requests the respective interrupt.
1
TIE1
Transmit Interrupt Enable for Buffer1. When a message has been
successfully transmitted out of TXB1 or Transmit Buffer 1 is
accessible again (e.g. after an Abort Transmission command), the
CAN Controller requests the respective interrupt.
0
X
2
3
EIE
Error Warning Interrupt Enable. If the Error or Bus Status change
(see Status Register), the CAN Controller requests the respective
interrupt.
0
0
X
X
DOIE
Data Overrun Interrupt Enable. If the Data Overrun Status bit is
set (see Status Register), the CAN Controller requests the
respective interrupt.
4
5
WUIE
EPIE
Wake-Up Interrupt Enable. If the sleeping CAN controller wakes
up, the respective interrupt is requested.
0
0
X
X
Error Passive Interrupt Enable. If the error status of the CAN
Controller changes from error active to error passive or vice versa,
the respective interrupt is requested.
6
7
8
9
ALIE
BEIE
IDIE
TIE2
Arbitration Lost Interrupt Enable. If the CAN Controller has lost
arbitration, the respective interrupt is requested.
0
0
0
0
X
X
X
X
Bus Error Interrupt Enable. If a bus error has been detected, the
CAN Controller requests the respective interrupt.
ID Ready Interrupt Enable. When a CAN identifier has been
received, the CAN Controller requests the respective interrupt.
Transmit Interrupt Enable for Buffer2. When a message has been
successfully transmitted out of TXB2 or Transmit Buffer 2 is
accessible again (e.g. after an Abort Transmission command), the
CAN Controller requests the respective interrupt.
10
TIE3
-
Transmit Interrupt Enable for Buffer3. When a message has been
successfully transmitted out of TXB3 or Transmit Buffer 3 is
accessible again (e.g. after an Abort Transmission command), the
CAN Controller requests the respective interrupt.
0
X
31:11
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
8.6 Bus Timing Register (CAN1BTR - 0xE004 4014, CAN2BTR -
0xE004 8014)
This register controls how various CAN timings are derived from the APB clock. It defines
the values of the Baud Rate Prescaler (BRP) and the Synchronization Jump Width (SJW).
Furthermore, it defines the length of the bit period, the location of the sample point and the
number of samples to be taken at each sample point. It can be read at any time but can
only be written if the RM bit in CANmod is 1.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 425. Bus Timing Register (CAN1BTR - address 0xE004 4014, CAN2BTR - address
0xE004 8014) bit description
Bit
Symbol Value Function
Reset RM
Value Set
9:0
BRP
Baud Rate Prescaler. The APB clock is divided by (this
value plus one) to produce the CAN clock.
0
X
13:10 -
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
15:14 SJW
19:16 TESG1
22:20 TESG2
The Synchronization Jump Width is (this value plus one)
CAN clocks.
0
X
X
X
The delay from the nominal Sync point to the sample point 1100
is (this value plus one) CAN clocks.
The delay from the sample point to the next nominal sync
point is (this value plus one) CAN clocks. The nominal CAN
bit time is (this value plus the value in TSEG1 plus 3) CAN
clocks.
001
23
SAM
Sampling
0
1
The bus is sampled once (recommended for high speed
buses)
0
X
The bus is sampled 3 times (recommended for low to
medium speed buses to filter spikes on the bus-line)
31:24 -
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
Baud rate prescaler
The period of the CAN system clock tSCL is programmable and determines the individual
bit timing. The CAN system clock tSCL is calculated using the following equation:
(6)
tSCL = tCANsuppliedCLK × (BRP + 1)
Synchronization jump width
To compensate for phase shifts between clock oscillators of different bus controllers, any
bus controller must re-synchronize on any relevant signal edge of the current
transmission. The synchronization jump width tSJW defines the maximum number of clock
cycles a certain bit period may be shortened or lengthened by one re-synchronization:
(7)
tSJW = tSCL × (SJW + 1)
Time segment 1 and time segment 2
Time segments TSEG1 and TSEG2 determine the number of clock cycles per bit period
and the location of the sample point:
(8)
tSYNCSEG = tSCL
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Chapter 18: LPC24XX CAN controllers CAN1/2
(9)
tTSEG1 = tSCL × (TSEG1 + 1)
(10)
tTSEG2 = tSCL × (TSEG2 + 1)
8.7 Error Warning Limit Register (CAN1EWL - 0xE004 4018, CAN2EWL -
0xE004 8018)
This register sets a limit on Tx or Rx errors at which an interrupt can occur. It can be read
at any time but can only be written if the RM bit in CANmod is 1. The default value (after
hardware reset) is 96.
Table 426. Error Warning Limit register (CAN1EWL - address 0xE004 4018, CAN2EWL -
address 0xE004 8018) bit description
Bit Symbol Function
Reset
Value
RM
Set
7:0 EWL
During CAN operation, this value is compared to both the Tx and 9610 = 0x60 X
Rx Error Counters. If either of these counter matches this value,
the Error Status (ES) bit in CANSR is set.
Note that a content change of the Error Warning Limit Register is possible only if the
Reset Mode was entered previously. An Error Status change (Status Register) and an
Error Warning Interrupt forced by the new register content will not occur until the Reset
Mode is cancelled again.
8.8 Status Register (CAN1SR - 0xE004 401C, CAN2SR - 0xE004 801C)
This register contains three status bytes in which the bits not related to transmission are
identical to the corresponding bits in the Global Status Register, while those relating to
transmission reflect the status of each of the 3 Tx Buffers.
Table 427. Status Register (CAN1SR - address 0xE004 401C, CAN2SR - address 0xE004 801C) bit description
Bit
Symbol Value
Function
Reset RM
Value Set
0
1
2
RBS
Receive Buffer Status. This bit is identical to the RBS bit in the CANxGSR.
Data Overrun Status. This bit is identical to the DOS bit in the CANxGSR.
Transmit Buffer Status 1.
0
0
1
0
0
1
DOS
TBS1[1]
0(locked)
Software cannot access the Tx Buffer 1 nor write to the corresponding
CANxTFI, CANxTID, CANxTDA, and CANxTDB registers because a
message is either waiting for transmission or is in transmitting process.
1(released)
Software may write a message into the Transmit Buffer 1 and its CANxTFI,
CANxTID, CANxTDA, and CANxTDB registers.
3
TCS1[2]
Transmission Complete Status.
1
1
x
0(incomplete) The previously requested transmission for Tx Buffer 1 is not complete.
1(complete)
The previously requested transmission for Tx Buffer 1 has been successfully
completed.
4
RS
Receive Status. This bit is identical to the RS bit in the GSR.
0
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 427. Status Register (CAN1SR - address 0xE004 401C, CAN2SR - address 0xE004 801C) bit description
Bit
Symbol Value
Function
Reset RM
Value Set
5
TS1
Transmit Status 1.
1
0
0(idle)
There is no transmission from Tx Buffer 1.
1(transmit)
The CAN Controller is transmitting a message from Tx Buffer 1.
Error Status. This bit is identical to the ES bit in the CANxGSR.
Bus Status. This bit is identical to the BS bit in the CANxGSR.
Receive Buffer Status. This bit is identical to the RBS bit in the CANxGSR.
Data Overrun Status. This bit is identical to the DOS bit in the CANxGSR.
Transmit Buffer Status 2.
6
ES
0
0
0
0
1
0
0
0
0
1
7
BS
8
RBS
DOS
TBS2[1]
9
10
0(locked)
Software cannot access the Tx Buffer 2 nor write to the corresponding
CANxTFI, CANxTID, CANxTDA, and CANxTDB registers because a
message is either waiting for transmission or is in transmitting process.
1(released)
Software may write a message into the Transmit Buffer 2 and its CANxTFI,
CANxTID, CANxTDA, and CANxTDB registers.
11
TCS2[2]
Transmission Complete Status.
1
x
0(incomplete) The previously requested transmission for Tx Buffer 2 is not complete.
1(complete)
The previously requested transmission for Tx Buffer 2 has been successfully
completed.
12
13
RS
Receive Status. This bit is identical to the RS bit in the GSR.
Transmit Status 2.
1
1
0
0
TS2
0(idle)
There is no transmission from Tx Buffer 2.
1(transmit)
The CAN Controller is transmitting a message from Tx Buffer 2.
Error Status. This bit is identical to the ES bit in the CANxGSR.
Bus Status. This bit is identical to the BS bit in the CANxGSR.
Receive Buffer Status. This bit is identical to the RBS bit in the CANxGSR.
Data Overrun Status. This bit is identical to the DOS bit in the CANxGSR.
Transmit Buffer Status 3.
14
15
16
17
18
ES
0
0
0
0
1
0
0
0
0
1
BS
RBS
DOS
TBS3[1]
0(locked)
Software cannot access the Tx Buffer 3 nor write to the corresponding
CANxTFI, CANxTID, CANxTDA, and CANxTDB registers because a
message is either waiting for transmission or is in transmitting process.
1(released)
Software may write a message into the Transmit Buffer 3 and its CANxTFI,
CANxTID, CANxTDA, and CANxTDB registers.
19
TCS3[2]
Transmission Complete Status.
1
x
0(incomplete) The previously requested transmission for Tx Buffer 3 is not complete.
1(complete)
The previously requested transmission for Tx Buffer 3 has been successfully
completed.
20
21
RS
Receive Status. This bit is identical to the RS bit in the GSR.
Transmit Status 3.
1
1
0
0
TS3
0(idle)
There is no transmission from Tx Buffer 3.
The CAN Controller is transmitting a message from Tx Buffer 3.
1(transmit)
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 427. Status Register (CAN1SR - address 0xE004 401C, CAN2SR - address 0xE004 801C) bit description
Bit
Symbol Value
Function
Reset RM
Value Set
22
ES
BS
-
Error Status. This bit is identical to the ES bit in the CANxGSR.
Bus Status. This bit is identical to the BS bit in the CANxGSR.
0
0
0
23
0
31:24
Reserved, user software should not write ones to reserved bits. The value
read from a reserved bit is not defined.
NA
[1] If the CPU tries to write to this Transmit Buffer when the Transmit Buffer Status bit is '0' (locked), the written byte is not accepted and is
lost without this being signalled.
[2] The Transmission Complete Status bit is set '0' (incomplete) whenever the Transmission Request bit or the Self Reception Request bit
is set '1' for this TX buffer. The Transmission Complete Status bit remains '0' until a message is transmitted successfully.
8.9 Receive Frame Status Register (CAN1RFS - 0xE004 4020, CAN2RFS -
0xE004 8020)
This register defines the characteristics of the current received message. It is read-only in
normal operation but can be written for testing purposes if the RM bit in CANxMOD is 1.
Table 428. Receive Frame Status register (CAN1RFS - address 0xE004 4020, CAN2RFS -
address 0xE004 8020) bit description
Bit
Symbol Function
Reset RM
Value Set
9:0
ID Index If the BP bit (below) is 0, this value is the zero-based number of the
Lookup Table RAM entry at which the Acceptance Filter matched
the received Identifier. Disabled entries in the Standard tables are
included in this numbering, but will not be matched. See Section
on page 518 for examples of ID Index values.
0
X
10
BP
If this bit is 1, the current message was received in AF Bypass
mode, and the ID Index field (above) is meaningless.
0
X
X
15:11 -
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
19:16 DLC
The field contains the Data Length Code (DLC) field of the current
received message. When RTR = 0, this is related to the number of
data bytes available in the CANRDA and CANRDB registers as
follows:
0
0000-0111 = 0 to 7 bytes1000-1111 = 8 bytes
With RTR = 1, this value indicates the number of data bytes
requested to be sent back, with the same encoding.
29:20 -
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
30
RTR
This bit contains the Remote Transmission Request bit of the
current received message. 0 indicates a Data Frame, in which (if
DLC is non-zero) data can be read from the CANRDA and possibly
the CANRDB registers. 1 indicates a Remote frame, in which case
the DLC value identifies the number of data bytes requested to be
sent using the same Identifier.
0
X
X
31
FF
A 0 in this bit indicates that the current received message included
an 11 bit Identifier, while a 1 indicates a 29 bit Identifier. This affects
the contents of the CANid register described below.
0
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Chapter 18: LPC24XX CAN controllers CAN1/2
8.9.1 ID index field
The ID Index is a 10-bit field in the Info Register that contains the table position of the ID
Look-up Table if the currently received message was accepted. The software can use this
index to simplify message transfers from the Receive Buffer into the Shared Message
Memory. Whenever bit 10 (BP) of the ID Index in the CANRFS register is 1, the current
CAN message was received in acceptance filter bypass mode.
8.10 Receive Identifier Register (CAN1RID - 0xE004 4024, CAN2RID -
0xE004 8024)
This register contains the Identifier field of the current received message. It is read-only in
normal operation but can be written for testing purposes if the RM bit in CANmod is 1. It
details on specific CAN channel register address.
Table 429. Receive Identifier Register (CAN1RID - address 0xE004 4024, CAN2RID - address
0xE004 8024) bit description
Bit
Symbol Function
Reset Value RM Set
10:0 ID
The 11 bit Identifier field of the current received
message. In CAN 2.0A, these bits are called ID10-0,
while in CAN 2.0B they’re called ID29-18.
0
X
31:11 -
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
Table 430. RX Identifier register when FF = 1
Bit Symbol Function
Reset Value RM Set
28:0 ID
The 29 bit Identifier field of the current received
message. In CAN 2.0B these bits are called ID29-0.
0
X
31:29 -
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
8.11 Receive Data Register A (CAN1RDA - 0xE004 4028, CAN2RDA -
0xE004 8028)
This register contains the first 1-4 Data bytes of the current received message. It is
read-only in normal operation, but can be written for testing purposes if the RM bit in
Table 431. Receive Data register A (CAN1RDA - address 0xE004 4028, CAN2RDA - address
0xE004 8028) bit description
Bit
Symbol Function
Reset RM
Value Set
7:0
Data 1 If the DLC field in CANRFS ≥ 0001, this contains the first Data byte
0
X
of the current received message.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 431. Receive Data register A (CAN1RDA - address 0xE004 4028, CAN2RDA - address
0xE004 8028) bit description
Bit
Symbol Function
Reset RM
Value Set
15:8 Data 2 If the DLC field in CANRFS ≥ 0010, this contains the first Data byte
0
0
0
X
X
X
of the current received message.
23:16 Data 3 If the DLC field in CANRFS ≥ 0011, this contains the first Data byte
of the current received message.
31:24 Data 4 If the DLC field in CANRFS ≥ 0100, this contains the first Data byte
of the current received message.
8.12 Receive Data Register B (CAN1RDB - 0xE004 402C, CAN2RDB -
0xE004 802C)
This register contains the 5th through 8th Data bytes of the current received message. It is
read-only in normal operation, but can be written for testing purposes if the RM bit in
Table 432. Receive Data register B (CAN1RDB - address 0xE004 402C, CAN2RDB - address
0xE004 802C) bit description
Bit
Symbol Function
Reset RM
Value Set
7:0
Data 5 If the DLC field in CANRFS ≥ 0101, this contains the first Data byte
0
0
0
0
X
X
X
X
of the current received message.
15:8 Data 6 If the DLC field in CANRFS ≥ 0110, this contains the first Data byte
of the current received message.
23:16 Data 7 If the DLC field in CANRFS ≥ 0111, this contains the first Data byte
of the current received message.
31:24 Data 8 If the DLC field in CANRFS ≥ 1000, this contains the first Data byte
of the current received message.
8.13 Transmit Frame Information Register (CAN1TFI[1/2/3] - 0xE004 40[30/
40/50], CAN2TFI[1/2/3] - 0xE004 80[30/40/50])
When the corresponding TBS bit in CANSR is 1, software can write to one of these
registers to define the format of the next transmit message for that Tx buffer. Bits not listed
read as 0 and should be written as 0.
The values for the reserved bits of the CANxTFI register in the Transmit Buffer should be
set to the values expected in the Receive Buffer for an easy comparison, when using the
Self Reception facility (self test), otherwise they are not defined.
The CAN Controller consist of three Transmit Buffers. Each of them has a length of 4
The buffer layout is subdivided into Descriptor and Data Field where the first word of the
Descriptor Field includes the TX Frame Info that describes the Frame Format, the Data
Length and whether it is a Remote or Data Frame. In addition, a TX Priority register allows
the definition of a certain priority for each transmit message. Depending on the chosen
Frame Format, an 11-bit identifier for Standard Frame Format (SFF) or an 29-bit identifier
for Extended Frame Format (EFF) follows. Note that unused bits in the TID field have to
be defined as 0. The Data Field in TDA and TDB contains up to eight data bytes.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 433. Transmit Frame Information Register (CAN1TFI[1/2/3] - address
0xE004 40[30/40/50], CAN2TFI[1/2/3] - 0xE004 80[30/40/50]) bit description
Bit
Symbol Function Reset RM
Value Set
7:0
PRIO
If the TPM (Transmit Priority Mode) bit in the CANxMOD register is
x
set to 1, enabled Tx Buffers contend for the right to send their
messages based on this field. The buffer with the lowest TX Priority
value wins the prioritization and is sent first.
15:8
-
Reserved.
0
19:16 DLC
Data Length Code. This value is sent in the DLC field of the next
transmit message. In addition, if RTR = 0, this value controls the
number of Data bytes sent in the next transmit message, from the
CANxTDA and CANxTDB registers:
0
X
0000-0111 = 0-7 bytes
1xxx = 8 bytes
29:20 -
Reserved.
0
0
30
RTR
This value is sent in the RTR bit of the next transmit message. If
this bit is 0, the number of data bytes called out by the DLC field are
sent from the CANxTDA and CANxTDB registers. If this bit is 1, a
Remote Frame is sent, containing a request for that number of
bytes.
X
X
31
FF
If this bit is 0, the next transmit message will be sent with an 11 bit
Identifier (standard frame format), while if it’s 1, the message will be
sent with a 29 bit Identifier (extended frame format).
0
Automatic transmit priority detection
To allow uninterrupted streams of transmit messages, the CAN Controller provides
Automatic Transmit Priority Detection for all Transmit Buffers. Depending on the selected
Transmit Priority Mode, internal prioritization is based on the CAN Identifier or a user
defined "local priority". If more than one message is enabled for transmission (TR=1) the
internal transmit message queue is organized such as that the transmit buffer with the
lowest CAN Identifier (TID) or the lowest "local priority" (TX Priority) wins the prioritization
and is sent first. The result of the internal scheduling process is taken into account short
before a new CAN message is sent on the bus. This is also true after the occurrence of a
transmission error and right before a re-transmission.
Tx DLC
The number of bytes in the Data Field of a message is coded with the Data Length Code
(DLC). At the start of a Remote Frame transmission the DLC is not considered due to the
RTR bit being '1 ' (remote). This forces the number of transmitted/received data bytes to
be 0. Nevertheless, the DLC must be specified correctly to avoid bus errors, if two CAN
Controllers start a Remote Frame transmission with the same identifier simultaneously.
For reasons of compatibility no DLC > 8 should be used. If a value greater than 8 is
selected, 8 bytes are transmitted in the data frame with the Data Length Code specified in
DLC. The range of the Data Byte Count is 0 to 8 bytes and is coded as follows:
(11)
DataByteCount = DLC
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Chapter 18: LPC24XX CAN controllers CAN1/2
8.14 Transmit Identifier Register (CAN1TID[1/2/3] - 0xE004 40[34/44/54],
CAN2TID[1/2/3] - 0xE004 80[34/44/54])
When the corresponding TBS bit in CANxSR is 1, software can write to one of these
registers to define the Identifier field of the next transmit message. Bits not listed read as 0
and should be written as 0. The register assumes two different formats depending on the
FF bit in CANTFI.
In Standard Frame Format messages, the CAN Identifier consists of 11 bits (ID.28 to
ID.18), and in Extended Frame Format messages, the CAN identifier consists of 29 bits
(ID.28 to ID.0). ID.28 is the most significant bit, and it is transmitted first on the bus during
the arbitration process. The Identifier acts as the message's name, used in a receiver for
acceptance filtering, and also determines the bus access priority during the arbitration
process.
Table 434. Transfer Identifier Register (CAN1TID[1/2/3] - address 0xE004 40[34/44/54],
CAN2TID[1/2/3] - address 0xE004 80[34/44/54]) bit description
Bit
Symbol Function
Reset RM
Value Set
10:0
ID
-
The 11 bit Identifier to be sent in the next transmit message.
0
X
31:11
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
Table 435. Transfer Identifier register when FF = 1
Bit
Symbol Function
Reset RM
Value Set
28:0
ID
-
The 29 bit Identifier to be sent in the next transmit message.
0
X
31:29
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
8.15 Transmit Data Register A (CAN1TDA[1/2/3] - 0xE004 40[38/48/58],
CAN2TDA[1/2/3] - 0xE004 80[38/48/58])
When the corresponding TBS bit in CANSR is 1, software can write to one of these
registers to define the first 1 - 4 data bytes of the next transmit message. The Data Length
Code defines the number of transferred data bytes. The first bit transmitted is the most
significant bit of TX Data Byte 1.
Table 436. Transmit Data Register A (CAN1TDA[1/2/3] - address 0xE004 40[38/48/58],
CAN2TDA[1/2/3] - address 0xE004 80[38/48/58]) bit description
Bit
Symbol Function
Reset
Value
RM
Set
7:0
Data 1 If RTR = 0 and DLC ≥ 0001 in the corresponding CANxTFI, this
0
0
0
0
X
X
X
X
byte is sent as the first Data byte of the next transmit message.
15;8 Data 2 If RTR = 0 and DLC ≥ 0010 in the corresponding CANxTFI, this
byte is sent as the 2nd Data byte of the next transmit message.
23:16 Data 3 If RTR = 0 and DLC ≥ 0011 in the corresponding CANxTFI, this
byte is sent as the 3rd Data byte of the next transmit message.
31:24 Data 4 If RTR = 0 and DLC ≥ 0100 in the corresponding CANxTFI, this
byte is sent as the 4th Data byte of the next transmit message.
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Chapter 18: LPC24XX CAN controllers CAN1/2
8.16 Transmit Data Register B (CAN1TDB[1/2/3] - 0xE004 40[3C/4C/5C],
CAN2TDB[1/2/3] - 0xE004 80[3C/4C/5C])
When the corresponding TBS bit in CANSR is 1, software can write to one of these
registers to define the 5th through 8th data bytes of the next transmit message. The Data
Length Code defines the number of transferred data bytes. The first bit transmitted is the
most significant bit of TX Data Byte 1.
Table 437. Transmit Data Register B (CAN1TDB[1/2/3] - address 0xE004 40[3C/4C/5C],
CAN2TDB[1/2/3] - address 0xE004 80[3C/4C/5C]) bit description
Bit
Symbol Function
Reset
Value
RM
Set
7:0
Data 5 If RTR = 0 and DLC ≥ 0101 in the corresponding CANTFI, this
0
0
0
0
X
X
X
X
byte is sent as the 5th Data byte of the next transmit message.
15;8 Data 6 If RTR = 0 and DLC ≥ 0110 in the corresponding CANTFI, this
byte is sent as the 6th Data byte of the next transmit message.
23:16 Data 7 If RTR = 0 and DLC ≥ 0111 in the corresponding CANTFI, this
byte is sent as the 7th Data byte of the next transmit message.
31:24 Data 8 If RTR = 0 and DLC ≥ 1000 in the corresponding CANTFI, this
byte is sent as the 8th Data byte of the next transmit message.
9. CAN controller operation
9.1 Error handling
The CAN Controllers count and handle transmit and receive errors as specified in CAN
Spec 2.0B. The Transmit and Receive Error Counters are incriminated for each detected
error and are decremented when operation is error-free. If the Transmit Error counter
contains 255 and another error occurs, the CAN Controller is forced into a state called
Bus-Off. In this state, the following register bits are set: BS in CANxSR, BEI and EI in
CANxIR if these are enabled, and RM in CANxMOD. RM resets and disables much of the
CAN Controller. Also at this time the Transmit Error Counter is set to 127 and the Receive
Error Counter is cleared. Software must next clear the RM bit. Thereafter the Transmit
Error Counter will count down 128 occurrences of the Bus Free condition (11 consecutive
recessive bits). Software can monitor this countdown by reading the Tx Error Counter.
When this countdown is complete, the CAN Controller clears BS and ES in CANxSR, and
sets EI in CANxSR if EIE in IER is 1.
The Tx and Rx error counters can be written if RM in CANxMOD is 1. Writing 255 to the
Tx Error Counter forces the CAN Controller to Bus-Off state. If Bus-Off (BS in CANxSR) is
1, writing any value 0 through 254 to the Tx Error Counter clears Bus-Off. When software
clears RM in CANxMOD thereafter, only one Bus Free condition (11 consecutive
recessive bits) is needed before operation resumes.
9.2 Sleep mode
The CAN Controller will enter sleep mode if the SM bit in the CAN Mode register is 1, no
CAN interrupt is pending, and there is no activity on the CAN bus. Software can only set
SM when RM in the CAN Mode register is 0; it can also set the WUIE bit in the CAN
Interrupt Enable register to enable an interrupt on any wake-up condition.
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The CAN Controller wakes up (and sets WUI in the CAN Interrupt register if WUIE in the
CAN Interrupt Enable register is 1) in response to a) a dominant bit on the CAN bus, or b)
software clearing SM in the CAN Mode register. A sleeping CAN Controller, that wakes up
in response to bus activity, is not able to receive an initial message, until after it detects
Bus_Free (11 consecutive recessive bits). If an interrupt is pending or the CAN bus is
active when software sets SM, the wake-up is immediate.
9.3 Interrupts
Each CAN Controller produces 3 interrupt requests, Receive, Transmit, and “other status”.
The Transmit interrupt is the OR of the Transmit interrupts from the three Tx Buffers. Each
Receive and Transmit interrupt request from each controller is assigned its own channel in
the Vectored Interrupt Controller (VIC), and can have its own interrupt service routine. The
“other status” interrupts from all of the CAN controllers, and the Acceptance Filter LUTerr
condition, are ORed into one VIC channel.
9.4 Transmit priority
If the TPM bit in the CANxMOD register is 0, multiple enabled Tx Buffers contend for the
right to send their messages based on the value of their CAN Identifier (TID). If TPM is 1,
they contend based on the PRIO fields in bits 7:0 of their CANxTFS registers. In both
cases the smallest binary value has priority. If two (or three) transmit-enabled buffers have
the same smallest value, the lowest-numbered buffer sends first.
The CAN controller selects among multiple enabled Tx Buffers dynamically, just before it
sends each message.
10. Centralized CAN registers
For easy and fast access, all CAN Controller Status bits from each CAN Controller Status
register are bundled together. Each defined byte of the following registers contains one
particular status bit from each of the CAN controllers, in its LS bits.
All Status registers are “read-only” and allow byte, half word and word access.
10.1 Central Transmit Status Register (CANTxSR - 0xE004 0000)
Table 438. Central Transit Status Register (CANTxSR - address 0xE004 0000) bit description
Bit
Symbol Description
Reset
Value
0
TS1
TS2
-
When 1, the CAN controller 1 is sending a message (same as TS in the
CAN1GSR).
0
1
When 1, the CAN controller 2 is sending a message (same as TS in the
CAN2GSR)
0
7:2
8
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
1
TBS1
TBS2
When 1, all 3 Tx Buffers of the CAN1 controller are available to the CPU
(same as TBS in CAN1GSR).
9
When 1, all 3 Tx Buffers of the CAN2 controller are available to the CPU
(same as TBS in CAN2GSR).
1
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Table 438. Central Transit Status Register (CANTxSR - address 0xE004 0000) bit description
Bit
Symbol Description
Reset
Value
15:10 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
16
TCS1
When 1, all requested transmissions have been completed successfully
by the CAN1 controller (same as TCS in CAN1GSR).
1
17:16 TCS2
31:18 -
When 1, all requested transmissions have been completed successfully
by the CAN2 controller (same as TCS in CAN2GSR).
1
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
10.2 Central Receive Status Register (CANRxSR - 0xE004 0004)
Table 439. Central Receive Status Register (CANRxSR - address 0xE004 0004) bit
description
Bit
Symbol Description
Reset
Value
0
RS1
RS2
-
When 1, CAN1 is receiving a message (same as RS in CAN1GSR).
0
1
When 1, CAN2 is receiving a message (same as RS in CAN2GSR).
0
7:2
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
8
9
RB1
RB2
When 1, a received message is available in the CAN1 controller (same
as RBS in CAN1GSR).
0
When 1, a received message is available in the CAN2 controller (same
as RBS in CAN2GSR).
0
15:10 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
0
16
DOS1
When 1, a message was lost because the preceding message to CAN1
controller was not read out quickly enough (same as DOS in CAN1GSR).
17:16 DOS2
31:18 -
When 1, a message was lost because the preceding message to CAN2
controller was not read out quickly enough (same as DOS in CAN2GSR).
0
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
10.3 Central Miscellaneous Status Register (CANMSR - 0xE004 0008)
Table 440. Central Miscellaneous Status Register (CANMSR - address 0xE004 0008) bit
description
Bit
Symbol Description
Reset
Value
0
E1
E2
-
When 1, one or both of the CAN1 Tx and Rx Error Counters has reached
the limit set in the CAN1EWL register (same as ES in CAN1GSR)
0
1
When 1, one or both of the CAN2 Tx and Rx Error Counters has reached
the limit set in the CAN2EWL register (same as ES in CAN2GSR)
0
7:2
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
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Table 440. Central Miscellaneous Status Register (CANMSR - address 0xE004 0008) bit
description
Bit
Symbol Description
Reset
Value
8
BS1
BS2
When 1, the CAN1 controller is currently involved in bus activities (same
as BS in CAN1GSR).
0
9
When 1, the CAN2 controller is currently involved in bus activities (same
as BS in CAN2GSR).
0
31:10 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
11. Global acceptance filter
This block provides lookup for received Identifiers (called Acceptance Filtering in CAN
terminology) for all the CAN Controllers. It includes a 512 × 32 (2 kB) RAM in which
software maintains one to five tables of Identifiers. This RAM can contain up to 1024
Standard Identifiers or 512 Extended Identifiers, or a mixture of both types.
12. Acceptance filter modes
The Acceptance Filter can be put into different modes by setting the according AccOff,
“Acceptance Filter Mode Register (AFMR - 0xE003 C000)”). During each mode the
access to the Configuration Register and the ID Look-up table is handled differently.
Table 441. Acceptance filter modes and access control
Acceptance Bit
Bit
Acceptance ID Look-up Acceptanc CAN controller
filter mode AccOff AccBP filter state
table
RAM[1]
e filter
config.
registers
message receive
interrupt
Off Mode
1
X
0
0
1
0
reset &
halted
r/w access
from CPU
r/w access
from CPU
no messages
accepted
Bypass
Mode
reset &
halted
r/w access
from CPU
r/w access
from CPU
all messages
accepted
Operating
Mode and
FullCAN
Mode
running
read only
access from hardware
filter only
[1] The whole ID Look-up Table RAM is only word accessible.
[2] During the Operating Mode of the Acceptance Filter the Look-up Table can be accessed only to disable or
enable Messages.
A write access to all section configuration registers is only possible during the Acceptance
Filter Off and Bypass Mode. Read access is allowed in all Acceptance Filter Modes.
12.1 Acceptance filter Off mode
The Acceptance Filter Off Mode is typically used during initialization. During this mode an
unconditional access to all registers and to the Look-up Table RAM is possible. With the
Acceptance Filter Off Mode, CAN messages are not accepted and therefore not stored in
the Receive Buffers of active CAN Controllers.
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12.2 Acceptance filter Bypass mode
The Acceptance Filter Bypass Mode can be used for example to change the acceptance
filter configuration during a running system, e.g. change of identifiers in the ID-Look-up
Table memory. During this re-configuration, software acceptance filtering has to be used.
It is recommended to use the ID ready Interrupt (ID Index) and the Receive Interrupt (RI).
In this mode all CAN message are accepted and stored in the Receive Buffers of active
CAN Controllers.
12.3 Acceptance filter Operating mode
The Acceptance Filter is in Operating Mode when neither the AccOff nor the AccBP in the
Configuration Register is set and the eFCAN = 0.
12.4 FullCAN mode
The Acceptance Filter is in Operating Mode when neither the AccOff nor the AccBP in the
Configuration Register is set and the eFCAN = 1. More details on FullCAN mode are
13. Sections of the ID look-up table RAM
Four 12-bit section configuration registers (SFF_sa, SFF_GRP_sa, EFF_sa,
EFF_GRP_sa) are used to define the boundaries of the different identifier sections in the
ID-Look-up Table Memory. The fifth 12-bit section configuration register, the End of Table
address register (ENDofTable) is used to define the end of all identifier sections. The End
of Table address is also used to assign the start address of the section where FullCAN
Message Objects, if enabled are stored.
Table 442. Section configuration register settings
ID-Look up Table Section
Register
Value
Section
status
FullCAN (Standard Frame Format) Identifier Section SFF_sa
= 0x000
> 0x000
disabled
enabled
disabled
enabled
Explicit Standard Frame Format Identifier Section
Group of Standard Frame Format Identifier Section
Explicit Extended Frame Format Identifier Section
SFF_GRP_sa = SFF_sa
> SFF_sa
EFF_sa
= SFF_GRP_sa disabled
> SFF_GRP_sa enabled
EFF_GRP_sa = EFF_sa
> EFF_sa
disabled
enabled
Group of Extended Frame Format Identifier Section ENDofTable
= EFF_GRP_sa disabled
> EFF_GRP_sa enabled
14. ID look-up table RAM
The Whole ID Look-up Table RAM is only word accessible. A write access is only possible
during the Acceptance Filter Off or Bypass Mode. Read access is allowed in all
Acceptance Filter Modes.
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If Standard (11 bit) Identifiers are used in the application, at least one of 3 tables in
Acceptance Filter RAM must not be empty. If the optional “fullCAN mode” is enabled, the
first table contains Standard identifiers for which reception is to be handled in this mode.
The next table contains individual Standard Identifiers and the third contains ranges of
Standard Identifiers, for which messages are to be received via the CAN Controllers. The
tables of fullCAN and individual Standard Identifiers must be arranged in ascending
numerical order, one per halfword, two per word. Since each CAN bus has its own
address map, each entry also contains the number of the CAN Controller (001-010) to
which it applies.
16
0
31
15
26
10
29
13
DIS
ABLE USED
NOT
CONTROLLER #
IDENTIFIER
Fig 78. Entry in FullCAN and individual standard identifier tables
The table of Standard Identifier Ranges contains paired upper and lower (inclusive)
bounds, one pair per word. These must also be arranged in ascending numerical order.
31
29
26
16
10
0
CONTROLLER
LOWER IDENTIFIER
BOUND
CONTROLLER
#
UPPER IDENTIFIER
BOUND
#
Fig 79. Entry in standard identifier range table
The disable bits in Standard entries provide a means to turn response, to particular CAN
Identifiers or ranges of Identifiers, on and off dynamically. When the Acceptance Filter
function is enabled, only the disable bits in Acceptance Filter RAM can be changed by
software. Response to a range of Standard addresses can be enabled by writing 32 zero
bits to its word in RAM, and turned off by writing 32 one bits (0xFFFF FFFF) to its word in
RAM. Only the disable bits are actually changed. Disabled entries must maintain the
ascending sequence of Identifiers.
If Extended (29 bit) Identifiers are used in the application, at least one of the other two
tables in Acceptance Filter RAM must not be empty, one for individual Extended Identifiers
and one for ranges of Extended Identifiers. The table of individual Extended Identifiers
must be arranged in ascending numerical order.
31
29 28
0
CONTROLLER #
IDENTIFIER
Fig 80. Entry in either extended identifier table
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The table of ranges of Extended Identifiers must contain an even number of entries, of the
same form as in the individual Extended Identifier table. Like the Individual Extended
table, the Extended Range must be arranged in ascending numerical order. The first and
second (3rd and 4th …) entries in the table are implicitly paired as an inclusive range of
Extended addresses, such that any received address that falls in the inclusive range is
received (accepted). Software must maintain the table to consist of such word pairs.
There is no facility to receive messages to Extended identifiers using the fullCAN method.
Five address registers point to the boundaries between the tables in Acceptance Filter
RAM: fullCAN Standard addresses, Standard Individual addresses, Standard address
ranges, Extended Individual addresses, and Extended address ranges. These tables
must be consecutive in memory. The start of each of the latter four tables is implicitly the
end of the preceding table. The end of the Extended range table is given in an End of
Tables register. If the start address of a table equals the start of the next table or the End
Of Tables register, that table is empty.
When the Receive side of a CAN controller has received a complete Identifier, it signals
the Acceptance Filter of this fact. The Acceptance Filter responds to this signal, and reads
the Controller number, the size of the Identifier, and the Identifier itself from the Controller.
It then proceeds to search its RAM to determine whether the message should be received
or ignored.
If fullCAN mode is enabled and the CAN controller signals that the current message
contains a Standard identifier, the Acceptance Filter first searches the table of identifiers
for which reception is to be done in fullCAN mode. Otherwise, or if the AF doesn’t find a
match in the fullCAN table, it searches its individual Identifier table for the size of Identifier
signalled by the CAN controller. If it finds an equal match, the AF signals the CAN
controller to retain the message, and provides it with an ID Index value to store in its
Receive Frame Status register.
If the Acceptance Filter does not find a match in the appropriate individual Identifier table,
it then searches the Identifier Range table for the size of Identifier signalled by the CAN
controller. If the AF finds a match to a range in the table, it similarly signals the CAN
controller to retain the message, and provides it with an ID Index value to store in its
Receive Frame Status register. If the Acceptance Filter does not find a match in either the
individual or Range table for the size of Identifier received, it signals the CAN controller to
discard/ignore the received message.
15. Acceptance filter registers
15.1 Acceptance Filter Mode Register (AFMR - 0xE003 C000)
The AccBP and AccOff bits of the acceptance filter mode register are used for putting the
acceptance filter into the Bypass and Off mode. The eFCAN bit of the mode register can
be used to activate a FullCAN mode enhancement for received 11-bit CAN ID messages.
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Table 443. Acceptance Filter Mode Register (AFMR - address 0xE003 C000) bit description
Bit Symbol Value Description
Reset
Value
0
1
AccOff[2]
AccBP[1]
1
1
if AccBP is 0, the Acceptance Filter is not operational. All Rx
messages on all CAN buses are ignored.
1
All Rx messages are accepted on enabled CAN controllers.
Software must set this bit before modifying the contents of any of
the registers described below, and before modifying the contents
of Lookup Table RAM in any way other than setting or clearing
Disable bits in Standard Identifier entries. When both this bit and
AccOff are 0, the Acceptance filter operates to screen received
CAN Identifiers.
0
2
eFCAN[3]
0
1
Software must read all messages for all enabled IDs on all
enabled CAN buses, from the receiving CAN controllers.
0
The Acceptance Filter itself will take care of receiving and storing
messages for selected Standard ID values on selected CAN
31:3 -
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
[1] Acceptance Filter Bypass Mode (AccBP): By setting the AccBP bit in the Acceptance Filter Mode Register,
the Acceptance filter is put into the Acceptance Filter Bypass mode. During bypass mode, the internal state
machine of the Acceptance Filter is reset and halted. All received CAN messages are accepted, and
acceptance filtering can be done by software.
[2] Acceptance Filter Off mode (AccOff): After power-upon hardware reset, the Acceptance filter will be in Off
mode, the AccOff bit in the Acceptance filter Mode register 0 will be set to 1. The internal state machine of
the acceptance filter is reset and halted. If not in Off mode, setting the AccOff bit, either by hardware or by
software, will force the acceptance filter into Off mode.
[3] FullCan Mode Enhancements: A FullCan mode for received CAN messages can be enabled by setting the
eFCAN bit in the acceptance filter mode register.
15.2 Section configuration registers
The 10 bit section configuration registers are used for the ID look-up table RAM to indicate
the boundaries of the different sections for explicit and group of CAN identifiers for 11 bit
CAN and 29 bit CAN identifiers, respectively. The 10 bit wide section configuration
registers allow the use of a 512x32 (2 kB) look-up table RAM. The whole ID Look-up Table
RAM is only word accessible. All five section configuration registers contain APB
addresses for the acceptance filter RAM and do not include the APB base address. A
write access to all section configuration registers is only possible during the Acceptance
filter off and Bypass modes. Read access is allowed in all acceptance filter modes.
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15.3 Standard Frame Individual Start Address Register (SFF_sa -
0xE003 C004)
Table 444. Standard Frame Individual Start Address Register (SFF_sa - address
0xE003 C004) bit description
Bit
Symbol Description
Reset
Value
1:0
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
Lookup RAM. If the table is empty, write the same value in this register
and the SFF_GRP_sa register described below. For compatibility with
possible future devices, write zeroes in bits 31:11 and 1:0 of this
register. If the eFCAN bit in the AFMR is 1, this value also indicates the
size of the table of Standard IDs which the Acceptance Filter will search
and (if found) automatically store received messages in Acceptance
Filter RAM.
0
31:11 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
[1] Write access to the look-up table section configuration registers are possible only during the Acceptance
filter bypass mode or the Acceptance filter off mode.
15.4 Standard Frame Group Start Address Register (SFF_GRP_sa -
0xE003 C008)
Table 445. Standard Frame Group Start Address Register (SFF_GRP_sa - address
0xE003 C008) bit description
Bit
Symbol
Description
Reset
Value
1:0
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
AF Lookup RAM. If the table is empty, write the same value in
this register and the EFF_sa register described below. The
largest value that should be written to this register is 0x800, when
only the Standard Individual table is used, and the last word
(address 0x7FC) in AF Lookup Table RAM is used. For
0
compatibility with possible future devices, please write zeroes in
bits 31:12 and 1:0 of this register.
31:12 -
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
[1] Write access to the look-up table section configuration registers are possible only during the Acceptance
filter bypass mode or the Acceptance filter off mode.
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15.5 Extended Frame Start Address Register (EFF_sa - 0xE003 C00C)
Table 446. Extended Frame Start Address Register (EFF_sa - address 0xE003 C00C) bit
description
Bit
Symbol
Description
Reset
Value
1:0
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
Lookup RAM. If the table is empty, write the same value in this register
and the EFF_GRP_sa register described below. The largest value that
should be written to this register is 0x800, when both Extended Tables
are empty and the last word (address 0x7FC) in AF Lookup Table RAM
is used. For compatibility with possible future devices, please write
zeroes in bits 31:11 and 1:0 of this register.
0
31:11 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
[1] Write access to the look-up table section configuration registers are possible only during the Acceptance
filter bypass mode or the Acceptance filter off mode.
15.6 Extended Frame Group Start Address Register (EFF_GRP_sa -
0xE003 C010)
Table 447. Extended Frame Group Start Address Register (EFF_GRP_sa - address
0xE003 C010) bit description
Bit
Symbol
Description
Reset
Value
1:0
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
AF Lookup RAM. If the table is empty, write the same value in this
register and the ENDofTable register described below. The largest
value that should be written to this register is 0x800, when this
table is empty and the last word (address 0x7FC) in AF Lookup
Table RAM is used. For compatibility with possible future devices,
please write zeroes in bits 31:12 and 1:0 of this register.
0
31:12 -
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
[1] Write access to the look-up table section configuration registers are possible only during the Acceptance
filter bypass mode or the Acceptance filter off mode.
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15.7 End of AF Tables Register (ENDofTable - 0xE003 C014)
Table 448. End of AF Tables Register (ENDofTable - address 0xE003 C014) bit description
Bit
Symbol
Description
Reset
Value
1:0
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
11:2 EndofTable The address above the last active address in the last active AF table.
0
For compatibility with possible future devices, please write zeroes in
bits 31:12 and 1:0 of this register.
If the eFCAN bit in the AFMR is 0, the largest value that should be
written to this register is 0x800, which allows the last word (address
0x7FC) in AF Lookup Table RAM to be used.
If the eFCAN bit in the AFMR is 1, this value marks the start of the
area of Acceptance Filter RAM, into which the Acceptance Filter will
automatically receive messages for selected IDs on selected CAN
buses. In this case, the maximum value that should be written to this
register is 0x800 minus 6 times the value in SFF_sa. This allows 12
bytes of message storage between this address and the end of
Acceptance Filter RAM, for each Standard ID that is specified
between the start of Acceptance Filter RAM, and the next active AF
table.
31:12 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
[1] Write access to the look-up table section configuration registers are possible only during the Acceptance
filter bypass mode or the Acceptance filter off mode.
15.8 Status registers
The look-up table error status registers, the error addresses, and the flag register provide
information if a programming error in the look-up table RAM during the ID screening was
encountered. The look-up table error address and flag register have only read access. If
an error is detected, the LUTerror flag is set, and the LUTerrorAddr register provides the
information under which address during an ID screening an error in the look-up table was
encountered. Any read of the LUTerrorAddr Filter block can be used for a look-up table
interrupt.
15.9 LUT Error Address Register (LUTerrAd - 0xE003 C018)
Table 449. LUT Error Address Register (LUTerrAd - address 0xE003 C018) bit description
Bit
Symbol Description
Reset
Value
1:0
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
10:2 LUTerrAd It the LUT Error bit (below) is 1, this read-only field contains the address
in AF Lookup Table RAM, at which the Acceptance Filter encountered
an error in the content of the tables.
0
31:11 -
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
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Chapter 18: LPC24XX CAN controllers CAN1/2
15.10 LUT Error Register (LUTerr - 0xE003 C01C)
Table 450. LUT Error Register (LUTerr - address 0xE003 C01C) bit description
Bit
Symbol Description
Reset
Value
0
LUTerr This read-only bit is set to 1 if the Acceptance Filter encounters an error
0
in the content of the tables in AF RAM. It is cleared when software reads
the LUTerrAd register. This condition is ORed with the “other CAN”
interrupts from the CAN controllers, to produce the request for a VIC
interrupt channel.
31:1
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
15.11 Global FullCANInterrupt Enable register (FCANIE - 0xE003 C020)
A write access to the Global FullCAN Interrupt Enable register is only possible when the
Acceptance Filter is in the off mode.
Table 451. Global FullCAN Enable register (FCANIE - address 0xE003 C020) bit description
Bit
Symbol Description
Reset
Value
0
FCANIE Global FullCAN Interrupt Enable. When 1, this interrupt is enabled.
0
31:1
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
15.12 FullCAN Interrupt and Capture registers (FCANIC0 - 0xE003 C024 and
FCANIC1 - 0xE003 C028)
Table 452. FullCAN Interrupt and Capture register 0 (FCANIC0 - address 0xE003 C024) bit
description
Bit
Symbol
Description
Reset
Value
0
IntPnd0
FullCan Interrupt Pending bit 0.
FullCan Interrupt Pending bit x.
FullCan Interrupt Pending bit 31.
0
0
0
...
31
IntPndx (0<x<31)
IntPnd31
Table 453. FullCAN Interrupt and Capture register 1 (FCANIC1 - address 0xE003 C028) bit
description
Bit
Symbol
Description
Reset
Value
0
IntPnd32
FullCan Interrupt Pending bit 32.
FullCan Interrupt Pending bit x.
FullCan Interrupt Pending bit 63.
0
0
0
...
31
IntPndx (32<x<63)
IntPnd63
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Chapter 18: LPC24XX CAN controllers CAN1/2
16. Configuration and search algorithm
The CAN Identifier Look-up Table Memory can contain explicit identifiers and groups of
CAN identifiers for Standard and Extended CAN Frame Formats. They are organized as a
sorted list or table with an increasing order of the Source CAN Channel (SCC) together
with CAN Identifier in each section.
SCC value equals CAN_controller - 1, i.e., SCC = 0 matches CAN1 and SCC = 1
matches CAN2.
Every CAN identifier is linked to an ID Index number. In case of a CAN Identifier match,
the matching ID Index is stored in the Identifier Index of the Frame Status Register
(CANRFS) of the according CAN Controller.
16.1 Acceptance filter search algorithm
The identifier screening process of the acceptance filter starts in the following order:
1. FullCAN (Standard Frame Format) Identifier Section
2. Explicit Standard Frame Format Identifier Section
3. Group of Standard Frame Format Identifier Section
4. Explicit Extended Frame Format Identifier Section
5. Group of Extended Frame Format Identifier Section
Note: Only activated sections will take part in the screening process.
In cases where equal message identifiers of same frame format are defined in more than
one section, the first match will end the screening process for this identifier.
For example, if the same Source CAN Channel in conjunction with the identifier is defined
in the FullCAN, the Explicit Standard Frame Format and the Group of Standard Frame
Format Identifier Sections, the screening will already be finished with the match in the
FullCAN section.
defined in the FullCAN, Explicit and Group of Standard Frame Format Identifier Sections.
This example corresponds to a LPC2290 compatible part that would have 6 CAN
controllers.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Message
Message
disable bit
disable bit
0
0
Index 0, 1
Index 2, 3
Index 4, 5
Index 6, 7
SCC = 1
SCC = 2
ID = 0x5A
SCC = 1
SCC = 3
SCC = 5
SCC = 6
...
...
...
...
FullCAN
Explicit
Standard
Frame
Format
Identifier
Section
0
0
0
...
...
...
0
0
0
SCC = 4
SCC = 6
Explicit
Standard
Frame
Format
Identifier
Section
0
0
0
0
0
0
Index 8, 9
Index 10, 11
Index 12, 13
SCC = 1
SCC = 2
SCC = 4
ID = 0x5A
SCC = 1
SCC = 3
SCC = 5
...
...
...
...
...
Group of
Standard
Frame
0
0
0
0
Index 14
Index 15
SCC = 1
SCC = 2
ID = 0x5A
...
SCC = 1
SCC = 2
ID = 0x5F
...
Format
Identifier
Section
Fig 81. ID Look-up table example explaining the search algorithm
The identifier 0x5A of the CAN Controller 1 with the Source CAN Channel SCC = 1, is
defined in all three sections. With this configuration incoming CAN messages on CAN
Controller 1 with a 0x5A identifier will find a match in the FullCAN section.
It is possible to disable the ‘0x5A identifier’ in the FullCAN section. With that, the
screening process would be finished with the match in the Explicit Identifier Section.
The first group in the Group Identifier Section has been defined in that way, that incoming
CAN messages with identifiers of 0x5A up to 0x5F are accepted on CAN Controller 1 with
the Source CAN Channel SCC = 1. As stated above, the identifier 0x5A would find a
match already in the FullCAN or in the Explicit Identifier section if enabled. The rest of the
defined identifiers of this group (0x5B to 0x5F) will find a match in this Group Identifier
Section.
This way the user can switch dynamically between different filter modes for same
identifiers.
17. FullCAN mode
The FullCAN mode is based on capabilities provided by the CAN Gateway module used in
the LPC2000 family of products. This block uses the Acceptance Filter to provide filtering
for both CAN channels.
The concept of the CAN Gateway block is mainly based on a BasicCAN functionality. This
concept fits perfectly in systems where a gateway is used to transfer messages or
message data between different CAN channels. A BasicCAN device is generating a
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Chapter 18: LPC24XX CAN controllers CAN1/2
receive interrupt whenever a CAN message is accepted and received. Software has to
move the received message out of the receive buffer from the according CAN controller
into the user RAM.
To cover dashboard like applications where the controller typically receives data from
several CAN channels for further processing, the CAN Gateway block was extended by a
so-called FullCAN receive function. This additional feature uses an internal message
handler to move received FullCAN messages from the receive buffer of the according
CAN controller into the FullCAN message object data space of Look-up Table RAM.
When fullCAN mode is enabled, the Acceptance Filter itself takes care of receiving and
storing messages for selected Standard ID values on selected CAN buses, in the style of
“FullCAN” controllers.
In order to set this bit and use this mode, two other conditions must be met with respect to
the contents of Acceptance Filter RAM and the pointers into it:
• The Standard Frame Individual Start Address Register (SFF_sa) must be greater than
or equal to the number of IDs for which automatic receive storage is to be done, times
two. SFF_sa must be rounded up to a multiple of 4 if necessary.
• The EndOfTable register must be less than or equal to 0x800 minus 6 times the
SFF_sa value, to allow 12 bytes of message storage for each ID for which automatic
receive storage will be done.
When these conditions are met and eFCAN is set:
• The area between the start of Acceptance Filter RAM and the SFF_sa address, is
used for a table of individual Standard IDs and CAN Controller/bus identification,
sorted in ascending order and in the same format as in the Individual Standard ID
page 499). Entries can be marked as “disabled” as in the other Standard tables. If
there are an odd number of “FullCAN” ID’s, at least one entry in this table must be so
marked.
• The first (SFF_sa)/2 IDindex values are assigned to these automatically-stored ID’s.
That is, IDindex values stored in the Rx Frame Status Register, for IDs not handled in
this way, are increased by (SFF_sa)/2 compared to the values they would have when
eFCAN is 0.
• When a Standard ID is received, the Acceptance Filter searches this table before the
Standard Individual and Group tables.
• When a message is received for a controller and ID in this table, the Acceptance filter
reads the received message out of the CAN controller and stores it in Acceptance
Filter RAM, starting at (EndOfTable) + its IDindex*12.
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Chapter 18: LPC24XX CAN controllers CAN1/2
17.1 FullCAN message layout
Table 454. Format of automatically stored Rx messages
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Address
0
F
F
R 0000
T
SEM 0000
[1:0]
DLC
00000
ID.28 ... ID.18
R
+4
+8
Rx Data 4
Rx Data 8
Rx Data 3
Rx Data 7
Rx Data 2
Rx Data 6
Rx Data 1
Rx Data 5
Since the FullCAN message object section of the Look-up table RAM can be accessed
both by the Acceptance Filter and the CPU, there is a method for insuring that no CPU
reads from FullCAN message object occurs while the Acceptance Filter hardware is
writing to that object.
For this purpose the Acceptance Filter uses a 3-state semaphore, encoded with the two
messages”) for each message object. This mechanism provides the CPU with information
about the current state of the Acceptance Filter activity in the FullCAN message object
section.
The semaphore operates in the following manner:
Table 455. FullCAN semaphore operation
SEM1
SEM0
activity
0
1
0
1
1
0
Acceptance Filter is updating the content
Acceptance Filter has finished updating the content
CPU is in process of reading from the Acceptance Filter
Prior to writing the first data byte into a message object, the Acceptance Filter will write
the FrameInfo byte into the according buffer location with SEM[1:0] = 01.
After having written the last data byte into the message object, the Acceptance Filter will
update the semaphore bits by setting SEM[1:0] = 11.
Before reading a message object, the CPU should read SEM[1:0] to determine the current
state of the Acceptance Filter activity therein. If SEM[1:0] = 01, then the Acceptance Filter
is currently active in this message object. If SEM[1:0] = 11, then the message object is
available to be read.
Before the CPU begins reading from the message object, it should clear SEM[1:0] = 00.
When the CPU is finished reading, it can check SEM[1:0] again. At the time of this final
check, if SEM[1:0] = 01 or 11, then the Acceptance Filter has updated the message object
during the time when the CPU reads were taking place, and the CPU should discard the
data. If, on the other hand, SEM[1:0] = 00 as expected, then valid data has been
successfully read by the CPU.
Figure 18–82 shows how software should use the SEM field to ensure that all three words
read from the message are all from the same received message.
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Chapter 18: LPC24XX CAN controllers CAN1/2
START
read 1st word
SEM == 01?
this message has not been
received since last check
SEM == 11?
clear SEM, write back 1st word
read 2nd and 3rd words
read 1st word
SEM == 00?
most recently read 1st, 2nd, and
3rd words are from the same
message
Fig 82. Semaphore procedure for reading an auto-stored message
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Chapter 18: LPC24XX CAN controllers CAN1/2
17.2 FullCAN interrupts
The CAN Gateway Block contains a 2 kB ID Look-up Table RAM. With this size a
maximum number of 146 FullCAN objects can be defined if the whole Look-up Table RAM
is used for FullCAN objects only. Only the first 64 FullCAN objects can be configured to
participate in the interrupt scheme. It is still possible to define more than 64 FullCAN
objects. The only difference is, that the remaining FullCAN objects will not provide a
FullCAN interrupt.
The FullCAN Interrupt Register-set contains interrupt flags (IntPndx) for (pending)
FullCAN receive interrupts. As soon as a FullCAN message is received, the according
interrupt bit (IntPndx) in the FCAN Interrupt Register gets asserted. In case that the Global
FullCAN Interrupt Enable bit is set, the FullCAN Receive Interrupt is passed to the
Vectored Interrupt Controller.
Application Software has to solve the following:
1. Index/Object number calculation based on the bit position in the FCANIC Interrupt
Register for more than one pending interrupt.
2. Interrupt priority handling if more than one FullCAN receive interrupt is pending.
The software that covers the interrupt priority handling has to assign a receive interrupt
priority to every FullCAN object. If more than one interrupt is pending, then the software
has to decide, which received FullCAN object has to be served next.
To each FullCAN object a new FullCAN Interrupt Enable bit (FCANIntxEn) is added, so
that it is possible to enable or disable FullCAN interrupts for each object individually. The
new Message Lost flag (MsgLstx) is introduced to indicate whether more than one
FullCAN message has been received since last time this message object was read by the
CPU. The Interrupt Enable and the Message Lost bits reside in the existing Look-up Table
RAM.
17.2.1 FullCAN message interrupt enable bit
FullCAN, Section. The new introduced FullCAN Message Interrupt enable bit can be used
to enable for each FullCAN message an Interrupt.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Message
disable bit
Message
disable bit
3
2
0
1
0
1
0
9
8
7
6
5 4
3
2
1
9
8
7
6
5
4
3
2
0
1
9
8
7
6
5
4
3
2
1
0
0
Index 0, 1
SCC
11-bit CAN ID
SCC
11-bit CAN ID
FullCAN
Explicit
0
0
0
0
Index 2, 3
Index 4, 5
SCC
SCC
11-bit CAN ID
11-bit CAN ID
SCC
SCC
11-bit CAN ID
11-bit CAN ID
Standard
Frame
Format
Identifier
0
0
Index 6, 7
SCC
11-bit CAN ID
SCC
11-bit CAN ID
Section
New:
New:
FullCAN
Message
Interrupt
FullCAN
Message
Interrupt
enable bit
enable bit
Fig 83. FullCAN section example of the ID look-up table
17.2.2 Message lost bit and CAN channel number
Figure 18–84 is the detailed layout structure of one FullCAN message stored in the
FullCAN message object section of the Look-up Table.
New:
FullCAN
Message
lost bit
New:
CAN
Source
Channel
31
24 23
16 15
10
9
8
7
0
APB
Base +
S
S
E
M
0
R
E
M
1
F
F
un-
ID.2
8
ID.1
8
T
R
unused
unused
............................
Msg_ObjAddr + 0
RX DLC
RX Data 3
RX Data 7
SCC
used
Msg_ObjAddr + 4
Msg_ObjAddr + 8
RX Data 4
RX Data 8
RX Data 2
RX Data 6
RX Data 1
RX Data 5
Fig 84. FullCAN message object layout
The new message lost bit (MsgLst) is introduced to indicate whether more than one
FullCAN message has been received since last time this message object was read. For
more information the CAN Source Channel (SCC) of the received FullCAN message is
added to Message Object.
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Chapter 18: LPC24XX CAN controllers CAN1/2
17.2.3 Setting the interrupt pending bits (IntPnd 63 to 0)
The interrupt pending bit (IntPndx) gets asserted in case of an accepted FullCAN
message and if the interrupt of the according FullCAN Object is enabled (enable bit
FCANIntxEn) is set).
During the last write access from the data storage of a FullCAN message object the
interrupt pending bit of a FullCAN object (IntPndx) gets asserted.
17.2.4 Clearing the interrupt pending bits (IntPnd 63 to 0)
Each of the FullCAN Interrupt Pending requests gets cleared when the semaphore bits of
a message object are cleared by Software (ARM CPU).
17.2.5 Setting the message lost bit of a FullCAN message object (MsgLost 63 to 0)
The Message Lost bit of a FullCAN message object gets asserted in case of an accepted
FullCAN message and when the FullCAN Interrupt of the same object is asserted already.
During the first write access from the data storage of a FullCAN message object the
Message Lost bit of a FullCAN object (MsgLostx) gets asserted if the interrupt pending bit
is set already.
17.2.6 Clearing the message lost bit of a FullCAN message object (MsgLost 63 to
0)
The Message Lost bit of a FullCAN message object gets cleared when the FullCAN
Interrupt of the same object is not asserted.
During the first write access from the data storage of a FullCAN message object the
Message Lost bit of a FullCAN object (MsgLostx) gets cleared if the interrupt pending bit
is not set.
17.3 Set and clear mechanism of the FullCAN interrupt
Special precaution is needed for the built-in set and clear mechanism of the FullCAN
Interrupts. The following text illustrates how the already existing Semaphore Bits (see
Section 18–17.1 “FullCAN message layout” for more details) and how the new introduced
features (IntPndx, MsgLstx) will behave.
17.3.1 Scenario 1: Normal case, no message lost
Figure 18–85 below shows a typical “normal” scenario in which an accepted FullCAN
message is stored in the FullCAN Message Object Section. After storage the message is
read out by Software (ARM CPU).
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Chapter 18: LPC24XX CAN controllers CAN1/2
semaphore
bits
01
11
00
IntPndx
Write
ID, SEM
write write write
read clear
SEM SEM
read read read
D1 D2 SEM
look-up
table
D1
D2 SEM
access
MsgLostx
ARM
processor
access
message
handler
access
Fig 85. Normal case, no messages lost
17.3.2 Scenario 2: Message lost
In this scenario a first FullCAN Message is stored and read out by Software (1st Object
write and read). In a second course a second message is stored (2nd Object write) but not
read out before a third message gets stored (3rd Object write). Since the FullCAN Interrupt
of that Object (IntPndx) is already asserted, the Message Lost Signal gets asserted.
semaphore
bits
01
11
00
01
11
11
IntPndx
look-up
table
access
write
ID,
SEM
write
ID,
SEM
write
ID,
write write write
write write write
read clear
SEM SEM
read read read
write write write
D1
D2 SEM
D1
D2 SEM
D1
D2 SEM
D1
D2 SEM
SEM
1st Object
write
2nd Object
write
3rd Object
write
1st Object
read
MsgLostx
message
handler
access
ARM
processor
access
Fig 86. Message lost
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17.3.3 Scenario 3: Message gets overwritten indicated by Semaphore bits
This scenario is a special case in which the lost message is indicated by the existing
semaphore bits. The scenario is entered, if during a Software read of a message object
another new message gets stored by the message handler. In this case, the FullCAN
Interrupt bit gets set for a second time with the 2nd Object write.
01
11
00
01
11
00
semaphore
bits
IntPndx
look-up
table
access
write
ID,
SEM
write
ID,
SEM
read clear
SEM SEM
read read read
D1 D2 SEM
read read read
write write write
clear
SEM
write write write
D1
D2 SEM
D1
D2 SEM
D1
D2 SEM
1st Object
write
2nd Object
write
2nd Object
read
1st Object read
Interrupt Service
Routine
MsgLostx
message
handler
access
ARM
processor
access
Fig 87. Message gets overwritten
17.3.4 Scenario 3.1: Message gets overwritten indicated by Semaphore bits and
Message Lost
This scenario is a sub-case to Scenario 3 in which the lost message is indicated by the
existing semaphore bits and by Message Lost.
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Chapter 18: LPC24XX CAN controllers CAN1/2
01
11
00
01
11
00
semaphore
bits
IntPndx
write
ID,
write
ID,
clear
SEM
write write write
D1 D2 SEM
read clear
SEM SEM
write write write
read read read
D1 D2 SEM
read read read
D1 D2 SEM
look-up
table
D1
D2 SEM
SEM
SEM
access
1st Object
write
2nd Object
write
2nd Object
read
1st Object read
Interrupt Service
Routine
MsgLostx
message
handler
access
ARM
processor
access
Fig 88. Message overwritten indicated by semaphore bits and message lost
17.3.5 Scenario 3.2: Message gets overwritten indicated by Message Lost
This scenario is a sub-case to Scenario 3 in which the lost message is indicated by
Message Lost.
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Chapter 18: LPC24XX CAN controllers CAN1/2
01
11
01
11
00
01
11
semaphore
bits
IntPndx
write
ID,
SEM
write
ID,
SEM
write
ID,
SEM
look-up
table
access
write write write read
write write write
clear read read read
write write write
D1
D2 SEM SEM
D1
D2 SEM
SEM
D1 D2 SEM
D1
D2 SEM
1st Object
write
2nd Object
write
3rd Object
write
1st Object
read
Interrupt Service
Routine
MsgLostx
message
handler
access
ARM
processor
access
Fig 89. Message overwritten indicated by message lost
17.3.6 Scenario 4: Clearing Message Lost bit
This scenario is a special case in which the lost message bit of an object gets set during
an overwrite of a none read message object (2nd Object write). The subsequent read out
of that object by Software (1st Object read) clears the pending Interrupt. The 3rd Object
write clears the Message Lost bit. Every “write ID, SEM” clears Message Lost bit if no
pending Interrupt of that object is set.
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01
11
01
11
00
11
semaphore
bits
IntPndx
write
ID,
SEM
write
ID,
SEM
write
ID,
SEM
write write write
D1 D2 SEM
write write write
read clear
SEM SEM
read read
D2 SEM
write write write
read
D1
look-up
table
D1
D2 SEM
D1
D2 SEM
access
1st Object
write
2nd Object
write
3rd Object
write
1st Object
read
MsgLostx
message
handler
access
ARM
processor
access
Fig 90. Clearing message lost
18. Examples of acceptance filter tables and ID index values
18.1 Example 1: only one section is used
SFF_sa
SFF_GRP_sa <
EFF_sa
EFF_GRP_sa <
<
ENDofTable
ENDofTable
ENDofTable
ENDofTable
OR
OR
OR
<
The start address of a section is lower than the end address of all programmed CAN
identifiers.
18.2 Example 2: all sections are used
SFF_sa
SFF_GRP_sa <
EFF_sa
EFF_GRP_sa <
<
SFF_GRP_sa
EFF_sa
EFF_GRP_sa
ENDofTable
AND
AND
AND
<
In cases of a section not being used, the start address has to be set onto the value of the
next section start address.
18.3 Example 3: more than one but not all sections are used
If the SFF group is not used, the start address of the SFF Group Section (SFF_GRP_sa
register) has to be set to the same value of the next section start address, in this case the
start address of the Explicit SFF Section (SFF_sa register).
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In cases where explicit identifiers as well as groups of the identifiers are programmed, a
CAN identifier search has to start in the explicit identifier section first. If no match is found,
it continues the search in the group of identifier section. By this order it can be guaranteed
that in case where an explicit identifier match is found, the succeeding software can
directly proceed on this certain message whereas in case of a group of identifier match
the succeeding software needs more steps to identify the message.
18.4 Configuration example 4
Suppose that the five Acceptance Filter address registers contain the values shown in the
third column below. In this case each table contains the decimal number of words and
entries shown in the next two columns, and the ID Index field of the CANRFS register can
return the decimal values shown in the column ID Indexes for CAN messages whose
Identifiers match the entries in that table.
Table 456. Example of Acceptance Filter Tables and ID index Values
Table
Register
Value
0x040
0x060
0x070
0x100
0x110
# Words
810
# Entire
1610
ID Indexes
0-1510
Standard Individual
Standard Group
Extended Individual
Extended Group
SFF_sa
SFF_GRP_sa
EFF_sa
410
410
16-1910
20-5510
56-5710
810
1610
EFF_GRP_sa
ENDofTable
810
1610
18.5 Configuration example 5
Figure 18–91 below is a more detailed and graphic example of the address registers,
table layout, and ID Index values. It shows:
• A Standard Individual table starting at the start of Acceptance Filter RAM and
containing 26 Identifiers, followed by:
• A Standard Group table containing 12 ranges of Identifiers, followed by:
• An Extended Individual table containing 3 Identifiers, followed by:
• An Extended Group table containing 2 ranges of Identifiers.
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Chapter 18: LPC24XX CAN controllers CAN1/2
000 d := 000 h := 0 0000 0000 b
SFF_sa
look-up table RAM
column_lower column_upper
ID index #
APB base +
address
0
1
2
0
2
1
3
00d = 00h
04d = 04h
3
22
23
24
25
22
24
23
25
44d = 2Ch
48d = 30h
2 6
26 d
52d = 34h
SFF_GRP_sa 52 d := 034 h := 0 0011 0100 b
lower_boundary 3 4 upper_boundary
lower_boundary 35 upper_boundary
84d = 54h
88d = 58h
34 d
35 d
92d = 5Ch
lower_boundary 36 upper_boundary 36 d
EFF_sa
100 d := 064 h := 0 0110 0100 b
38
39
38 d
39 d
100d = 64h
104d = 68h
EFF_GRP_sa
112 d := 070 h := 0 0111 0000 b
41 d
42 d
lower_boundary 41
112d = 70h
116d = 74h
upper_boundary
lower_boundary 42
upper_boundary
120d = 78h
124d = 7Ch
ENDofTable 128 d := 080 h := 0 1000 0000 b
Fig 91. Detailed example of acceptance filter tables and ID index values
18.6 Configuration example 6
The Table below shows which sections and therefore which types of CAN identifiers are
used and activated. The ID-Look-up Table configuration of this example is shown in
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Chapter 18: LPC24XX CAN controllers CAN1/2
Table 457. Used ID-Look-up Table sections
ID-Look-up Table Section
FullCAN
Status
not activated
activated
activated
activated
activated
Explicit Standard Frame Format
Group of Standard Frame Format
Explicit Extended Frame Format
Group of Extended Frame Format
Explicit standard frame format identifier section (11-bit CAN ID):
The start address of the Explicit Standard Frame Format section is defined in the SFF_sa
register with the value of 0x00. The end of this section is defined in the SFF_GRP_sa
register. In the Explicit Standard Frame Format section of the ID Look-up Table two CAN
Identifiers with their Source CAN Channels (SCC) share one 32-bit word. Not used or
disabled CAN Identifiers can be marked by setting the message disable bit.
Group of standard frame format identifier section (11-bit CAN ID):
The start address of the Group of Standard Frame Format section is defined with the
SFF_GRP_sa register with the value of 0x10. The end of this section is defined with the
EFF_sa register. In the Group of Standard Frame Format section two CAN Identifiers with
the same Source CAN Channel (SCC) share one 32-bit word and represent a range of
CAN Identifiers to be accepted. Bit 31 down to 16 represents the lower boundary and bit
15 down to 0 represents the upper boundary of the range of CAN Identifiers. All Identifiers
within this range (including the boundary identifiers) will be accepted. A whole group can
be disabled and not used by the acceptance filter by setting the message disable bit in the
upper and lower boundary identifier. To provide memory space for four Groups of
Standard Frame Format identifiers, the EFF_sa register value is set to 0x20. The identifier
group with the Index 9 of this section is not used and therefore disabled.
The start address of the Explicit Extended Frame Format section is defined with the
EFF_sa register with the value of 0x20. The end of this section is defined with the
EFF_GRP_sa register. In the explicit Extended Frame Format section only one CAN
Identifier with its Source CAN Channel (SCC) is programmed per address line. To provide
memory space for four Explicit Extended Frame Format identifiers, the EFF_GRP_sa
register value is set to 0x30.
The start address of the Group of Extended Frame Format is defined with the
EFF_GRP_sa register with the value of 0x30. The end of this section is defined with the
End of Table address register (ENDofTable). In the Group of Extended Frame Format
section the boundaries are programmed with a pair of address lines; the first is the lower
boundary, the second the upper boundary. To provide memory space for two Groups of
Extended Frame Format Identifiers, the ENDofTable register value is set to 0x40.
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Chapter 18: LPC24XX CAN controllers CAN1/2
Message
Message
disable bit
disable bit
Index
MSB
ID28
MSB
ID28
LSB
ID18
SFF_sa
= 0x00
LSB
ID18
0
0
0
0
0
1
0
0
0
1
SCC
SCC
SCC
SCC
SCC
SCC
0
SCC
SCC
SCC
SCC
SCC
SCC
SCC
SCC
12
1
Explicit
Standard
Frame
..Format
Identifier
Section
MSB
ID28
MSB
ID28
LSB
ID18
LSB
ID18
2
3
MSB
ID28
MSB
ID28
LSB
ID18
LSB
ID18
4
5
Disabled, 7
8
MSB
ID28
LSB
ID18
LSB
ID18
MSB
ID28
6
8
MSB
ID28
LSB
ID18
MSB
ID28
LSB
ID18
SFF_GRP_sa
0
1
Group 8
= 0x10
Group of
Standard
Frame
Format
.
Identifier
MSB
ID28
LSB
ID18
MSB
ID28
LSB
ID18
Disabled
Group 9
Disabled, 9
Disabled, 9
MSB
ID28
LSB
ID18
MSB
ID28
LSB
ID18
1
0
1
0
Group 10
SCC
SCC
SCC
10
11
10
11
MSB
ID28
LSB
ID18
MSB
ID28
LSB
Section
Group 11
ID18
MSB
ID28
LSB
ID0
EFF_sa
= 0x20
Explicit
Extended
Frame
Format
Identifier
Section
LSB
ID0
MSB
ID28
SCC
SCC
SCC
SCC
SCC
SCC
SCC
13
LSB
ID0
MSB
ID28
14
LSB
ID0
MSB
ID28
15
EFF_GRP_sa
= 0x30
LSB
ID0
MSB
ID28
16
Group of
Extended
Frame
Format
Identifier
Section
Group 16
Group 17
LSB
ID0
MSB
ID28
16
MSB
ID28
LSB
ID0
17
LSB
ID0
MSB
ID28
17
ENDofTable
= 0x40
Fig 92. ID Look-up table configuration example (no FullCAN)
18.7 Configuration example 7
The Table below shows which sections and therefore which types of CAN identifiers are
used and activated. The ID-Look-up Table configuration of this example is shown in
This example uses a typical configuration in which FullCAN as well as Explicit Standard
Frame Format messages are defined. As described in Section 18–16.1 “Acceptance filter
search algorithm”, acceptance filtering takes place in a certain order. With the enabled
FullCAN section, the identifier screening process of the acceptance filter starts always in
the FullCAN section first, before it continues with the rest of enabled sections.e disabled.
Table 458. Used ID-Look-up Table sections
ID-Look-up Table Section
FullCAN
Status
activated and enabled
activated
Explicit Standard Frame Format
Group of Standard Frame Format
Explicit Extended Frame Format
Group of Extended Frame Format
not activated
not activated
not activated
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Chapter 18: LPC24XX CAN controllers CAN1/2
FullCAN explicit standard frame format identfier section (11-bit CAN ID)
The start address of the FullCAN Explicit Standard Frame Format Identifier section is
(automatically) set to 0x00. The end of this section is defined in the SFF_sa register. In the
FullCAN ID section only identifiers of FullCAN Object are stored for acceptance filtering.
In this section two CAN Identifiers with their Source CAN Channels (SCC) share one
32-bit word. Not used or disabled CAN Identifiers can be marked by setting the message
disable bit. The FullCAN Object data for each defined identifier can be found in the
FullCAN Message Object section. In case of an identifier match during the acceptance
filter process, the received FullCAN message object data is moved from the Receive
Buffer of the appropriate CAN Controller into the FullCAN Message Object section. To
provide memory space for eight FullCAN, Explicit Standard Frame Format identifiers, the
SFF_sa register value is set to 0x10. The identifier with the Index 1 of this section is not
used and therefore disabled.
Explicit standard frame format identifier section (11-bit CAN ID)
The start address of the Explicit Standard Frame Format section is defined in the SFF_sa
register with the value of 0x10. The end of this section is defined in the End of Table
address register (ENDofTable). In the explicit Standard Frame Format section of the ID
Look-up Table two CAN Identifiers with their Source CAN Channel (SCC) share one 32-bit
word. Not used or disabled CAN Identifiers can be marked by setting the message disable
bit. To provide memory space for eight Explicit Standard Frame Format identifiers, the
ENDofTable register value is set to 0x20.
FullCAN message object data section
The start address of the FullCAN Message Object Data section is defined with the
ENDofTable register. The number of enabled FullCAN identifiers is limited to the available
memory space in the FullCAN Message Object Data section. Each defined FullCAN
Message needs three address lines for the Message Data in the FullCAN Message Object
Data section. The FullCAN Message Object section is organized in that way, that each
Index number of the FullCAN Identifier section corresponds to a Message Object Number
in the FullCAN Message Object section.
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Chapter 18: LPC24XX CAN controllers CAN1/2
FullCAN
Interrupt
Enable bit
FullCAN
Interrupt
Enable bit
Message
Disable bit
Message
Disable bit
Index
MSB
ID28
LSB
MSB
ID28
LSB
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
FullCAN
Explicit
0
2
Disabled, 1
SCC
SCC
SCC
SCC
SCC
SCC
SCC
SCC
ID18
ID18
MSB
ID28
LSB
ID18
LSB
ID18
MSB
ID28
Standard
Frame
..Format
Identifier
Section
3
5
MSB
ID28
LSB
ID18
MSB
ID28
MSB
ID28
LSB
ID18
4
MSB
ID28
LSB
ID18
LSB
ID18
6
7
SFF_sa
= 0x10
MSB
ID28
MSB
ID28
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
8
9
SCC
SCC
SCC
SCC
Explicit
Standard
Frame
.Format
Identifier
Section
MSB
ID28
MSB
ID28
10
12
14
11
13
15
MSB
ID28
MSB
ID28
SCC
SCC
SCC
SCC
MSB
ID28
LSB
ID18
MSB
ID28
LSB
ID18
ENDofTable =
SFF_GRP_sa =
EFF_sa =
FF RTR SEM DLC CAN-ID
RXDATA 4, 3, 2, 1
Message Object
Data 0
FullCAN
Message
Object
section
Section
EFF_GRP_sa =
0x20
RXDATA 8, 7, 6, 5
No Message Data, disabled.
No Message Data, disabled.
No Message Data, disabled.
FF RTR SEM DLC CAN-ID
RXDATA 4, 3, 2, 1
Message Object
Data 1
Message Object
Data 2
RXDATA 8, 7, 6, 5
Fig 93. ID Look-up table configuration example (FullCAN activated and enabled)
18.8 Look-up table programming guidelines
All identifier sections of the ID Look-up Table have to be programmed in such a way, that
each active section is organized as a sorted list or table with an increasing order of the
Source CAN Channel (SCC) together with CAN Identifier in each section.
SCC value equals CAN_controller - 1, i.e., SCC = 0 matches CAN1 and SCC = 1
matches CAN2.
In cases, where a syntax error in the ID Look-up Table is encountered, the Look-up Table
address of the incorrect line is made available in the Look-up Table Error Address
Register (LUTerrAd).
The reporting process in the Look-up Table Error Address Register (LUTerrAd) is a
“run-time” process. Only those address lines with syntax error are reported, which were
passed through the acceptance filtering process.
The following general rules for programming the Look-up Table apply:
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• Each section has to be organized as a sorted list or table with an increasing order of
the Source CAN Channel (SCC) in conjunction with the CAN Identifier (there is no
exception for disabled identifiers).
• The upper and lower bound in a Group of Identifiers definition has to be from the
same Source CAN Channel.
• To disable a Group of Identifiers the message disable bit has to be set for both, the
upper and lower bound.
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Chapter 19: LPC24XX SPI
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User manual
1. Basic configuration
The SPI is configured using the following registers:
Remark: On reset, the SPI is enabled (PCSPI = 1).
3. Pins: Select SPI pins and their modes in PINSEL0 to PINSEL4 and PINMODE0 to
Remark: In the VIC, the SPI shares its interrupts with the SSP0 interface.
2. Features
• Compliant with Serial Peripheral Interface (SPI) specification.
• Synchronous, Serial, Full Duplex Communication.
• SPI master or slave.
• Maximum data bit rate of one eighth of the input clock rate.
• 8 to 16 bits per transfer.
3. SPI overview
SPI is a full duplex serial interfaces. It can handle multiple masters and slaves being
connected to a given bus. Only a single master and a single slave can communicate on
the interface during a given data transfer. During a data transfer the master always sends
8 to 16 bits of data to the slave, and the slave always sends a byte of data to the master.
4. SPI data transfers
Figure 19–94 is a timing diagram that illustrates the four different data transfer formats
that are available with the SPI. This timing diagram illustrates a single 8 bit data transfer.
The first thing you should notice in this timing diagram is that it is divided into three
horizontal parts. The first part describes the SCK and SSEL signals. The second part
describes the MOSI and MISO signals when the CPHA variable is 0. The third part
describes the MOSI and MISO signals when the CPHA variable is 1.
In the first part of the timing diagram, note two points. First, the SPI is illustrated with
CPOL set to both 0 and 1. The second point to note is the activation and de-activation of
the SSEL signal. When CPHA = 0, the SSEL signal will always go inactive between data
transfers. This is not guaranteed when CPHA = 1 (the signal can remain active).
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SCK (CPOL = 0)
SCK (CPOL = 1)
SSEL
CPHA = 0
1
2
3
4
5
6
7
8
Cycle # CPHA = 0
MOSI (CPHA = 0)
MISO (CPHA = 0)
BIT 1
BIT 1
BIT 2
BIT 2
BIT 3
BIT 3
BIT 4
BIT 4
BIT 5
BIT 5
BIT 6
BIT 6
BIT 7
BIT 7
BIT 8
BIT 8
CPHA = 1
1
2
3
4
5
6
7
8
Cycle # CPHA = 1
MOSI (CPHA = 1)
MISO (CPHA = 1)
BIT 1
BIT 1
BIT 2
BIT 2
BIT 3
BIT 3
BIT 4
BIT 4
BIT 5
BIT 5
BIT 6
BIT 6
BIT 7
BIT 7
BIT 8
BIT 8
Fig 94. SPI data transfer format (CPHA = 0 and CPHA = 1)
summarizes the following for each setting of CPOL and CPHA.
• When the first data bit is driven.
• When all other data bits are driven.
• When data is sampled.
Table 459. SPI Data To Clock Phase Relationship
CPOL and CPHA settings First data driven
Other data driven Data sampled
CPOL = 0, CPHA = 0
CPOL = 0, CPHA = 1
CPOL = 1, CPHA = 0
CPOL = 1, CPHA = 1
Prior to first SCK rising edge SCK falling edge
First SCK rising edge SCK rising edge
Prior to first SCK falling edge SCK rising edge
First SCK falling edge SCK falling edge
SCK rising edge
SCK falling edge
SCK falling edge
SCK rising edge
The definition of when an 8 bit transfer starts and stops is dependent on whether a device
is a master or a slave, and the setting of the CPHA variable.
When a device is a master, the start of a transfer is indicated by the master having a byte
of data that is ready to be transmitted. At this point, the master can activate the clock, and
begin the transfer. The transfer ends when the last clock cycle of the transfer is complete.
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When a device is a slave and CPHA is set to 0, the transfer starts when the SSEL signal
goes active, and ends when SSEL goes inactive. When a device is a slave, and CPHA is
set to 1, the transfer starts on the first clock edge when the slave is selected, and ends on
the last clock edge where data is sampled.
5. SPI peripheral details
5.1 General information
There are four registers that control the SPI peripheral. They are described in detail in
The SPI control register contains a number of programmable bits used to control the
function of the SPI block. The settings for this register must be set up prior to a given data
transfer taking place.
The SPI status register contains read only bits that are used to monitor the status of the
SPI interface, including normal functions, and exception conditions. The primary purpose
of this register is to detect completion of a data transfer. This is indicated by the SPIF bit.
The remaining bits in the register are exception condition indicators. These exceptions will
be described later in this section.
The SPI data register is used to provide the transmit and receive data bytes. An internal
shift register in the SPI block logic is used for the actual transmission and reception of the
serial data. Data is written to the SPI data register for the transmit case. There is no buffer
between the data register and the internal shift register. A write to the data register goes
directly into the internal shift register. Therefore, data should only be written to this register
when a transmit is not currently in progress. Read data is buffered. When a transfer is
complete, the receive data is transferred to a single byte data buffer, where it is later read.
A read of the SPI data register returns the value of the read data buffer.
The SPI clock counter register controls the clock rate when the SPI block is in master
mode. This needs to be set prior to a transfer taking place, when the SPI block is a
master. This register has no function when the SPI block is a slave.
The I/Os for this implementation of SPI are standard CMOS I/Os. The open drain SPI
option is not implemented in this design. When a device is set up to be a slave, its I/Os are
only active when it is selected by the SSEL signal being active.
5.2 Master operation
The following sequence describes how one should process a data transfer with the SPI
block when it is set up to be the master. This process assumes that any prior data transfer
has already completed.
1. Set the SPI clock counter register to the desired clock rate.
2. Set the SPI control register to the desired settings.
3. Write the data to transmitted to the SPI data register. This write starts the SPI data
transfer.
4. Wait for the SPIF bit in the SPI status register to be set to 1. The SPIF bit will be set
after the last cycle of the SPI data transfer.
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5. Read the SPI status register.
6. Read the received data from the SPI data register (optional).
7. Go to step 3 if more data is required to transmit.
Note: A read or write of the SPI data register is required in order to clear the SPIF status
bit. Therefore, if the optional read of the SPI data register does not take place, a write to
this register is required in order to clear the SPIF status bit.
5.3 Slave operation
The following sequence describes how one should process a data transfer with the SPI
block when it is set up to be a slave. This process assumes that any prior data transfer
has already completed. It is required that the system clock driving the SPI logic be at least
8X faster than the SPI.
1. Set the SPI control register to the desired settings.
2. Write the data to transmitted to the SPI data register (optional). Note that this can only
be done when a slave SPI transfer is not in progress.
3. Wait for the SPIF bit in the SPI status register to be set to 1. The SPIF bit will be set
after the last sampling clock edge of the SPI data transfer.
4. Read the SPI status register.
5. Read the received data from the SPI data register (optional).
6. Go to step 2 if more data is required to transmit.
Note: A read or write of the SPI data register is required in order to clear the SPIF status
bit. Therefore, at least one of the optional reads or writes of the SPI data register must
take place, in order to clear the SPIF status bit.
5.4 Exception conditions
Read Overrun
A read overrun occurs when the SPI block internal read buffer contains data that has not
been read by the processor, and a new transfer has completed. The read buffer
containing valid data is indicated by the SPIF bit in the status register being active. When
a transfer completes, the SPI block needs to move the received data to the read buffer. If
the SPIF bit is active (the read buffer is full), the new receive data will be lost, and the read
overrun (ROVR) bit in the status register will be activated.
Write Collision
As stated previously, there is no write buffer between the SPI block bus interface, and the
internal shift register. As a result, data must not be written to the SPI data register when a
SPI data transfer is currently in progress. The time frame where data cannot be written to
the SPI data register is from when the transfer starts, until after the status register has
been read when the SPIF status is active. If the SPI data register is written in this time
frame, the write data will be lost, and the write collision (WCOL) bit in the status register
will be activated.
Mode Fault
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If the SSEL signal goes active, when the SPI block is a master, this indicates another
master has selected the device to be a slave. This condition is known as a mode fault.
When a mode fault is detected, the mode fault (MODF) bit in the status register will be
activated, the SPI signal drivers will be de-activated, and the SPI mode will be changed to
be a slave.
If the Px.y/SSEL/... pin is assigned the SSEL function in Pin Function Select Register 0,
the SSEL signal must always be inactive when the SPI controller is a master.
Slave Abort
A slave transfer is considered to be aborted, if the SSEL signal goes inactive before the
transfer is complete. In the event of a slave abort, the transmit and receive data for the
transfer that was in progress are lost, and the slave abort (ABRT) bit in the status register
will be activated.
6. Pin description
Table 460. SPI pin description
Pin
Type
Pin Description
Name
SCK
Input/
Serial Clock. The SPI is a clock signal used to synchronize the transfer of data
Output across the SPI interface. The SPI is always driven by the master and received
by the slave. The clock is programmable to be active high or active low. The SPI
is only active during a data transfer. Any other time, it is either in its inactive
state, or tri-stated.
SSEL Input
Slave Select. The SPI slave select signal is an active low signal that indicates
which slave is currently selected to participate in a data transfer. Each slave has
its own unique slave select signal input. The SSEL must be low before data
transactions begin and normally stays low for the duration of the transaction. If
the SSEL signal goes high any time during a data transfer, the transfer is
considered to be aborted. In this event, the slave returns to idle, and any data
that was received is thrown away. There are no other indications of this
exception. This signal is not directly driven by the master. It could be driven by a
simple general purpose I/O under software control.
On the LPC2400 (unlike earlier NXP ARM devices) the SSEL pin can be used
for a different function when the SPI interface is only used in Master mode. For
example, pin hosting the SSEL function can be configured as an output digital
GPIO pin and used to select one of the SPI slaves.
MISO Input/
Master In Slave Out. The MISO signal is a unidirectional signal used to transfer
Output serial data from the slave to the master. When a device is a slave, serial data is
output on this signal. When a device is a master, serial data is input on this
signal. When a slave device is not selected, the slave drives the signal high
impedance.
MOSI Input/
Master Out Slave In. The MOSI signal is a unidirectional signal used to transfer
Output serial data from the master to the slave. When a device is a master, serial data
is output on this signal. When a device is a slave, serial data is input on this
signal.
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Chapter 19: LPC24XX SPI
7. Register description
and word accessible.
Table 461. SPI register map
Name
Description
Access Reset
Value[1]
Address
S0SPCR
S0SPSR
S0SPDR
SPI Control Register. This register controls the
operation of the SPI.
R/W
0x00
0x00
0x00
0xE002 0000
0xE002 0004
0xE002 0008
SPI Status Register. This register shows the
status of the SPI.
RO
SPI Data Register. This bi-directional register
provides the transmit and receive data for the
SPI. Transmit data is provided to the SPI0 by
writing to this register. Data received by the SPI0
can be read from this register.
R/W
S0SPCCR SPI Clock Counter Register. This register
controls the frequency of a master’s SCK0.
R/W
R/W
0x00
0x00
0xE002 000C
0xE002 001C
S0SPINT SPI Interrupt Flag. This register contains the
interrupt flag for the SPI interface.
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
7.1 SPI Control Register (S0SPCR - 0xE002 0000)
The S0SPCR register controls the operation of the SPI0 as per the configuration bits
setting.
Table 462: SPI Control Register (S0SPCR - address 0xE002 0000) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
-
Reserved, user software should not write ones to
NA
reserved bits. The value read from a reserved bit is not
defined.
2
3
BitEnable
CPHA
0
1
The SPI controller sends and receives 8 bits of data per
transfer.
0
The SPI controller sends and receives the number of bits
selected by bits 11:8.
Clock phase control determines the relationship between
the data and the clock on SPI transfers, and controls
when a slave transfer is defined as starting and ending.
0
Data is sampled on the first clock edge of SCK. A transfer
starts and ends with activation and deactivation of the
SSEL signal.
0
1
Data is sampled on the second clock edge of the SCK. A
transfer starts with the first clock edge, and ends with the
last sampling edge when the SSEL signal is active.
4
CPOL
Clock polarity control.
SCK is active high.
SCK is active low.
0
0
1
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Chapter 19: LPC24XX SPI
Table 462: SPI Control Register (S0SPCR - address 0xE002 0000) bit description
Bit
Symbol
Value Description
Reset
Value
5
MSTR
Master mode select.
0
0
1
The SPI operates in Slave mode.
The SPI operates in Master mode.
6
LSBF
SPIE
BITS
LSB First controls which direction each byte is shifted
when transferred.
0
0
1
SPI data is transferred MSB (bit 7) first.
SPI data is transferred LSB (bit 0) first.
Serial peripheral interrupt enable.
SPI interrupts are inhibited.
7
0
0
1
A hardware interrupt is generated each time the SPIF or
MODF bits are activated.
11:8
When bit 2 of this register is 1, this field controls the
number of bits per transfer:
0000
1000 8 bits per transfer
1001 9 bits per transfer
1010 10 bits per transfer
1011 11 bits per transfer
1100 12 bits per transfer
1101 13 bits per transfer
1110 14 bits per transfer
1111
0000 16 bits per transfer
Reserved, user software should not write ones to
15 bits per transfer
15:12
-
NA
reserved bits. The value read from a reserved bit is not
defined.
7.2 SPI Status Register (S0SPSR - 0xE002 0004)
The S0SPSR register controls the operation of the SPI0 as per the configuration bits
setting.
Table 463: SPI Status Register (S0SPSR - address 0xE002 0004) bit description
Bit
Symbol
Description
Reset Value
2:0
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
3
4
ABRT
Slave abort. When 1, this bit indicates that a slave abort has
occurred. This bit is cleared by reading this register.
0
MODF
Mode fault. when 1, this bit indicates that a Mode fault error has
occurred. This bit is cleared by reading this register, then writing
the SPI0 control register.
0
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Chapter 19: LPC24XX SPI
Table 463: SPI Status Register (S0SPSR - address 0xE002 0004) bit description
Bit
Symbol
Description
Reset Value
5
ROVR
Read overrun. When 1, this bit indicates that a read overrun has
occurred. This bit is cleared by reading this register.
0
6
7
WCOL
SPIF
Write collision. When 1, this bit indicates that a write collision has
occurred. This bit is cleared by reading this register, then
accessing the SPI data register.
0
0
SPI transfer complete flag. When 1, this bit indicates when a SPI
data transfer is complete. When a master, this bit is set at the
end of the last cycle of the transfer. When a slave, this bit is set
on the last data sampling edge of the SCK. This bit is cleared by
first reading this register, then accessing the SPI data register.
Note: this is not the SPI interrupt flag. This flag is found in the
SPINT register.
7.3 SPI Data Register (S0SPDR - 0xE002 0008)
This bi-directional data register provides the transmit and receive data for the SPI.
Transmit data is provided to the SPI by writing to this register. Data received by the SPI
can be read from this register. When a master, a write to this register will start a SPI data
transfer. Writes to this register will be blocked from when a data transfer starts to when the
SPIF status bit is set, and the status register has not been read.
Table 464: SPI Data Register (S0SPDR - address 0xE002 0008) bit description
Bit
Symbol
Description
Reset Value
7:0 DataLow SPI Bi-directional data port.
0x00
15:8 DataHigh If bit 2 of the SPCR is 1 and bits 11:8 are other than 1000, some 0x00
or all of these bits contain the additional transmit and receive
bits. When less than 16 bits are selected, the more significant
among these bits read as zeroes.
7.4 SPI Clock Counter Register (S0SPCCR - 0xE002 000C)
This register controls the frequency of a master’s SCK. The register indicates the number
of SPI peripheral clock cycles that make up an SPI clock.
In Master mode, this register must be an even number greater than or equal to 8.
Violations of this can result in unpredictable behavior. The SPI0 SCK rate may be
calculated as: PCLK_SPI / SPCCR0 value. The SPI peripheral clock is determined by the
PCLKSEL0 register contents for PCLK_SPI.
In Slave mode, the SPI clock rate provided by the master must not exceed 1/8 of the SPI
relevant.
Table 465: SPI Clock Counter Register (S0SPCCR - address 0xE002 000C) bit description
Bit
Symbol
Description
Reset Value
7:0 Counter
SPI0 Clock counter setting.
0x00
7.5 SPI Test Control Register (SPTCR - 0xE002 0010)
Note that the bits in this register are intended for functional verification only. This register
should not be used for normal operation.
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Chapter 19: LPC24XX SPI
Table 466: SPI Test Control Register (SPTCR - address 0xE002 0010) bit description
Bit
Symbol
Description
Reset Value
0
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
7:1 Test
SPI test mode. When 0, the SPI operates normally. When 1,
SCK will always be on, independent of master mode select, and
data availability setting.
0
7.6 SPI Test Status Register (SPTSR - 0xE002 0014)
Note: The bits in this register are intended for functional verification only. This register
should not be used for normal operation.
This register is a replication of the SPI status register. The difference between the
registers is that a read of this register will not start the sequence of events required to
clear these status bits. A write to this register will set an interrupt if the write data for the
respective bit is a 1.
Table 467: SPI Test Status Register (SPTSR - address 0xE002 0014) bit description
Bit
Symbol
Description
Reset Value
2:0
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
3
4
5
6
7
ABRT
MODF
ROVR
WCOL
SPIF
Slave abort.
0
0
0
0
0
Mode fault.
Read overrun.
Write collision.
SPI transfer complete flag.
7.7 SPI Interrupt Register (S0SPINT - 0xE002 001C)
This register contains the interrupt flag for the SPI0 interface.
Table 468: SPI Interrupt Register (S0SPINT - address 0xE002 001C) bit description
Bit Symbol Description
Reset
Value
0
SPI
SPI interrupt flag. Set by the SPI interface to generate an interrupt. Cleared
0
Interrupt by writing a 1 to this bit.
Flag
Note: this bit will be set once when SPIE = 1 and at least one of SPIF and
WCOL bits is 1. However, only when the SPI Interrupt bit is set and SPI0
Interrupt is enabled in the VIC, SPI based interrupt can be processed by
interrupt handling software.
7:1 -
Reserved, user software should not write ones to reserved bits. The value NA
read from a reserved bit is not defined.
8. Architecture
The block diagram of the SPI solution implemented in SPI0 interface is shown in the
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Chapter 19: LPC24XX SPI
MOSI_IN
MOSI_OUT
MISO_IN
MISO_OUT
SPI SHIFT REGISTER
SCK_IN
SCK_OUT
SS_IN
SPI CLOCK
GENERATOR &
DETECTOR
SPI Interrupt
APB Bus
SPI REGISTER
INTERFACE
SPI STATE CONTROL
SCK_OUT_EN
MOSI_OUT_EN
MISO_OUT_EN
OUTPUT
ENABLE
LOGIC
Fig 95. SPI block diagram
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Chapter 20: LPC24XX SSP interface SSP0/1
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1. Basic configuration
The SSP0/1 interfaces are configured using the following registers:
Remark: On reset, both SSP interfaces are enabled (PCSSP0/1 = 1).
2. Clock: In PCLK_SEL0 select PCLK_SSP1; in PCLK_SEL1 select PCLK_SSP0 (see
Section 4–3.3.4. In master mode, the clock must be scaled down (see
3. Pins: Select SSP pins and their modes in PINSEL0 to PINSEL4 and PINMODE0 to
Remark: In the VIC, the SSP0 shares its interrupts with the SPI interface.
2. Features
• Compatible with Motorola SPI, 4-wire TI SSI, and National Semiconductor Microwire
buses.
• Synchronous Serial Communication.
• Master or slave operation.
• 8 frame FIFOs for both transmit and receive.
• 4 to 16 bits frame.
• DMA transfers supported by GPDMA.
3. Description
The SSP is a Synchronous Serial Port (SSP) controller capable of operation on a SPI,
4-wire SSI, or Microwire bus. It can interact with multiple masters and slaves on the bus.
Only a single master and a single slave can communicate on the bus during a given data
transfer. Data transfers are in principle full duplex, with frames of 4 to 16 bits of data
flowing from the master to the slave and from the slave to the master. In practice it is often
the case that only one of these data flows carries meaningful data.
LPC2400 has two Synchronous Serial Port controllers -- SSP0 and SSP1.
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Chapter 20: LPC24XX SSP interface SSP0/1
4. Pin descriptions
Table 469. SSP pin descriptions
Interface pin
name/function
Pin
Name
Type
Pin Description
SPI
SSI
Microwire
SCK0/1 I/O
SCK CLK
SK
Serial Clock. SCK/CLK/SK is a clock signal used
to synchronize the transfer of data. It is driven by
the master and received by the slave. When SPI
interface is used the clock is programmable to be
active high or active low, otherwise it is always
active high. SCK1 only switches during a data
transfer. Any other time, the SSPn either holds it in
its inactive state, or does not drive it (leaves it in
high impedance state).
SSEL0/1 I/O
SSEL FS
CS
Frame Sync/Slave Select. When the SSPn is a
bus master, it drives this signal from shortly before
the start of serial data, to shortly after the end of
serial data, to signify a data transfer as appropriate
for the selected bus and mode. When the SSPn is a
bus slave, this signal qualifies the presence of data
from the Master, according to the protocol in use.
When there is just one bus master and one bus
slave, the Frame Sync or Slave Select signal from
the Master can be connected directly to the slave’s
corresponding input. When there is more than one
slave on the bus, further qualification of their Frame
Select/Slave Select inputs will typically be
necessary to prevent more than one slave from
responding to a transfer.
MISO0/1 I/O
MISO DR(M) SI(M)
DX(S) SO(S)
Master In Slave Out. The MISO signal transfers
serial data from the slave to the master. When the
SSPn is a slave, serial data is output on this signal.
When the SSPn is a master, it clocks in serial data
from this signal. When the SSPn is a slave and is
not selected by FS/SSEL, it does not drive this
signal (leaves it in high impedance state).
MOSI0/1 I/O
MOSI DX(M) SO(M)
DR(S) SI(S)
Master Out Slave In. The MOSI signal transfers
serial data from the master to the slave. When the
SSPn is a master, it outputs serial data on this
signal. When the SSPn is a slave, it clocks in serial
data from this signal.
5. Bus description
5.1 Texas Instruments synchronous serial frame format
supported by the SSP module.
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Chapter 20: LPC24XX SSP interface SSP0/1
CLK
FS
DX/DR
MSB
LSB
4 to 16 bits
a. Single frame transfer
CLK
FS
DX/DR
MSB
LSB
MSB
LSB
4 to 16 bits
4 to 16 bits
b. Continuous/back-to-back frames transfer
Fig 96. Texas Instruments Synchronous Serial Frame Format: a) Single and b) Continuous/back-to-back Two
Frames Transfer
For device configured as a master in this mode, CLK and FS are forced LOW, and the
transmit data line DX is tristated whenever the SSP is idle. Once the bottom entry of the
transmit FIFO contains data, FS is pulsed HIGH for one CLK period. The value to be
transmitted is also transferred from the transmit FIFO to the serial shift register of the
transmit logic. On the next rising edge of CLK, the MSB of the 4 to 16 bit data frame is
shifted out on the DX pin. Likewise, the MSB of the received data is shifted onto the DR
pin by the off-chip serial slave device.
Both the SSP and the off-chip serial slave device then clock each data bit into their serial
shifter on the falling edge of each CLK. The received data is transferred from the serial
shifter to the receive FIFO on the first rising edge of CLK after the LSB has been latched.
5.2 SPI frame format
The SPI interface is a four-wire interface where the SSEL signal behaves as a slave
select. The main feature of the SPI format is that the inactive state and phase of the SCK
signal are programmable through the CPOL and CPHA bits within the SSPCR0 control
register.
5.2.1 Clock Polarity (CPOL) and Phase (CPHA) control
When the CPOL clock polarity control bit is LOW, it produces a steady state low value on
the SCK pin. If the CPOL clock polarity control bit is HIGH, a steady state high value is
placed on the CLK pin when data is not being transferred.
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The CPHA control bit selects the clock edge that captures data and allows it to change
state. It has the most impact on the first bit transmitted by either allowing or not allowing a
clock transition before the first data capture edge. When the CPHA phase control bit is
LOW, data is captured on the first clock edge transition. If the CPHA clock phase control
bit is HIGH, data is captured on the second clock edge transition.
5.2.2 SPI format with CPOL=0,CPHA=0
Single and continuous transmission signal sequences for SPI format with CPOL = 0,
SCK
SSEL
MSB
MSB
LSB
LSB
MOSI
MISO
Q
4 to 16 bits
a. Single transfer with CPOL=0 and CPHA=0
SCK
SSEL
MOSI
MISO
MSB
MSB
LSB
LSB
MSB
MSB
LSB
LSB
Q
Q
4 to 16 bits
4 to 16 bits
b. Continuous transfer with CPOL=0 and CPHA=0
Fig 97. SPI frame format with CPOL=0 and CPHA=0 (a) Single and b) Continuous Transfer)
In this configuration, during idle periods:
• The CLK signal is forced LOW.
• SSEL is forced HIGH.
• The transmit MOSI/MISO pad is in high impedance.
If the SSP is enabled and there is valid data within the transmit FIFO, the start of
transmission is signified by the SSEL master signal being driven LOW. This causes slave
data to be enabled onto the MISO input line of the master. Master’s MOSI is enabled.
One half SCK period later, valid master data is transferred to the MOSI pin. Now that both
the master and slave data have been set, the SCK master clock pin goes HIGH after one
further half SCK period.
The data is now captured on the rising and propagated on the falling edges of the SCK
signal.
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In the case of a single word transmission, after all bits of the data word have been
transferred, the SSEL line is returned to its idle HIGH state one SCK period after the last
bit has been captured.
However, in the case of continuous back-to-back transmissions, the SSEL signal must be
pulsed HIGH between each data word transfer. This is because the slave select pin
freezes the data in its serial peripheral register and does not allow it to be altered if the
CPHA bit is logic zero. Therefore the master device must raise the SSEL pin of the slave
device between each data transfer to enable the serial peripheral data write. On
completion of the continuous transfer, the SSEL pin is returned to its idle state one SCK
period after the last bit has been captured.
5.2.3 SPI format with CPOL=0,CPHA=1
The transfer signal sequence for SPI format with CPOL = 0, CPHA = 1 is shown in
Figure 20–98, which covers both single and continuous transfers.
SCK
SSEL
MSB
MSB
LSB
LSB
MOSI
MISO
Q
Q
4 to 16 bits
Fig 98. SPI frame format with CPOL=0 and CPHA=1
In this configuration, during idle periods:
• The CLK signal is forced LOW.
• SSEL is forced HIGH.
• The transmit MOSI/MISO pad is in high impedance.
If the SSP is enabled and there is valid data within the transmit FIFO, the start of
transmission is signified by the SSEL master signal being driven LOW. Master’s MOSI pin
is enabled. After a further one half SCK period, both master and slave valid data is
enabled onto their respective transmission lines. At the same time, the SCK is enabled
with a rising edge transition.
Data is then captured on the falling edges and propagated on the rising edges of the SCK
signal.
In the case of a single word transfer, after all bits have been transferred, the SSEL line is
returned to its idle HIGH state one SCK period after the last bit has been captured.
For continuous back-to-back transfers, the SSEL pin is held LOW between successive
data words and termination is the same as that of the single word transfer.
5.2.4 SPI format with CPOL = 1,CPHA = 0
Single and continuous transmission signal sequences for SPI format with CPOL=1,
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SCK
SSEL
MSB
MSB
LSB
MOSI
MISO
LSB
Q
4 to 16 bits
a. Single transfer with CPOL=1 and CPHA=0
SCK
SSEL
MOSI
MISO
MSB
MSB
LSB
LSB
MSB
MSB
LSB
LSB
Q
Q
4 to 16 bits
4 to 16 bits
b. Continuous transfer with CPOL=1 and CPHA=0
Fig 99. SPI frame format with CPOL = 1 and CPHA = 0 (a) Single and b) Continuous Transfer)
In this configuration, during idle periods:
• The CLK signal is forced HIGH.
• SSEL is forced HIGH.
• The transmit MOSI/MISO pad is in high impedance.
If the SSP is enabled and there is valid data within the transmit FIFO, the start of
transmission is signified by the SSEL master signal being driven LOW, which causes
slave data to be immediately transferred onto the MISO line of the master. Master’s MOSI
pin is enabled.
One half period later, valid master data is transferred to the MOSI line. Now that both the
master and slave data have been set, the SCK master clock pin becomes LOW after one
further half SCK period. This means that data is captured on the falling edges and be
propagated on the rising edges of the SCK signal.
In the case of a single word transmission, after all bits of the data word are transferred, the
SSEL line is returned to its idle HIGH state one SCK period after the last bit has been
captured.
However, in the case of continuous back-to-back transmissions, the SSEL signal must be
pulsed HIGH between each data word transfer. This is because the slave select pin
freezes the data in its serial peripheral register and does not allow it to be altered if the
CPHA bit is logic zero. Therefore the master device must raise the SSEL pin of the slave
device between each data transfer to enable the serial peripheral data write. On
completion of the continuous transfer, the SSEL pin is returned to its idle state one SCK
period after the last bit has been captured.
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5.2.5 SPI format with CPOL = 1,CPHA = 1
The transfer signal sequence for SPI format with CPOL = 1, CPHA = 1 is shown in
Figure 20–100, which covers both single and continuous transfers.
SCK
SSEL
MSB
MSB
LSB
LSB
MOSI
MISO
Q
Q
4 to 16 bits
Fig 100. SPI Frame Format with CPOL = 1 and CPHA = 1
In this configuration, during idle periods:
• The CLK signal is forced HIGH.
• SSEL is forced HIGH.
• The transmit MOSI/MISO pad is in high impedance.
If the SSP is enabled and there is valid data within the transmit FIFO, the start of
transmission is signified by the SSEL master signal being driven LOW. Master’s MOSI is
enabled. After a further one half SCK period, both master and slave data are enabled onto
their respective transmission lines. At the same time, the SCK is enabled with a falling
edge transition. Data is then captured on the rising edges and propagated on the falling
edges of the SCK signal.
After all bits have been transferred, in the case of a single word transmission, the SSEL
line is returned to its idle HIGH state one SCK period after the last bit has been captured.
For continuous back-to-back transmissions, the SSEL pins remains in its active LOW
state, until the final bit of the last word has been captured, and then returns to its idle state
as described above. In general, for continuous back-to-back transfers the SSEL pin is
held LOW between successive data words and termination is the same as that of the
single word transfer.
5.3 Semiconductor Microwire frame format
shows the same format when back-to-back frames are transmitted.
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Chapter 20: LPC24XX SSP interface SSP0/1
SK
CS
MSB
LSB
SO
SI
8 bit control
MSB
LSB
0
4 to 16 bits
output data
Fig 101. Microwire frame format (single transfer)
Microwire format is very similar to SPI format, except that transmission is half-duplex
instead of full-duplex, using a master-slave message passing technique. Each serial
transmission begins with an 8 bit control word that is transmitted from the SSP to the
off-chip slave device. During this transmission, no incoming data is received by the SSP.
After the message has been sent, the off-chip slave decodes it and, after waiting one
serial clock after the last bit of the 8 bit control message has been sent, responds with the
required data. The returned data is 4 to 16 bits in length, making the total frame length
anywhere from 13 to 25 bits.
In this configuration, during idle periods:
• The SK signal is forced LOW.
• CS is forced HIGH.
• The transmit data line SO is arbitrarily forced LOW.
A transmission is triggered by writing a control byte to the transmit FIFO.The falling edge
of CS causes the value contained in the bottom entry of the transmit FIFO to be
transferred to the serial shift register of the transmit logic, and the MSB of the 8 bit control
frame to be shifted out onto the SO pin. CS remains LOW for the duration of the frame
transmission. The SI pin remains tristated during this transmission.
The off-chip serial slave device latches each control bit into its serial shifter on the rising
edge of each SK. After the last bit is latched by the slave device, the control byte is
decoded during a one clock wait-state, and the slave responds by transmitting data back
to the SSP. Each bit is driven onto SI line on the falling edge of SK. The SSP in turn
latches each bit on the rising edge of SK. At the end of the frame, for single transfers, the
CS signal is pulled HIGH one clock period after the last bit has been latched in the receive
serial shifter, that causes the data to be transferred to the receive FIFO.
Note: The off-chip slave device can tristate the receive line either on the falling edge of
SK after the LSB has been latched by the receive shiftier, or when the CS pin goes HIGH.
For continuous transfers, data transmission begins and ends in the same manner as a
single transfer. However, the CS line is continuously asserted (held LOW) and
transmission of data occurs back to back. The control byte of the next frame follows
directly after the LSB of the received data from the current frame. Each of the received
values is transferred from the receive shifter on the falling edge SK, after the LSB of the
frame has been latched into the SSP.
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Chapter 20: LPC24XX SSP interface SSP0/1
SK
CS
SO
LSB
MSB
LSB
8 bit control
SI
MSB
LSB
MSB
LSB
0
4 to 16 bits
output data
4 to 16 bits
output data
Fig 102. Microwire frame format (continuos transfers)
5.3.1 Setup and hold time requirements on CS with respect to SK in Microwire
mode
In the Microwire mode, the SSP slave samples the first bit of receive data on the rising
edge of SK after CS has gone LOW. Masters that drive a free-running SK must ensure
that the CS signal has sufficient setup and hold margins with respect to the rising edge of
SK.
Figure 20–103 illustrates these setup and hold time requirements. With respect to the SK
rising edge on which the first bit of receive data is to be sampled by the SSP slave, CS
must have a setup of at least two times the period of SK on which the SSP operates. With
respect to the SK rising edge previous to this edge, CS must have a hold of at least one
SK period.
tSETUP=2*tSK
tHOLD= tSK
SK
CS
SI
Fig 103. Microwire frame format setup and hold details
6. Register description
The register offsets from the SSP controller base addresses are shown in the
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Chapter 20: LPC24XX SSP interface SSP0/1
Table 470. SSP Register Map
Generic Name
Description
Access Reset
SSPn Register
CR0
Control Register 0. Selects the serial clock rate, bus R/W
type, and data size.
0
0
0
SSP0CR0 - 0xE006 8000
SSP1CR0 - 0xE003 0000
CR1
Control Register 1. Selects master/slave and other R/W
modes.
SSP0CR1 - 0xE006 8004
SSP1CR1 - 0xE003 0004
DR
Data Register. Writes fill the transmit FIFO, and
reads empty the receive FIFO.
R/W
SSP0DR - 0xE006 8008
SSP1DR - 0xE003 0008
SR
Status Register
RO
SSP0SR - 0xE006 800C
SSP1SR - 0xE003 000C
CPSR
IMSC
RIS
Clock Prescale Register
R/W
R/W
R/W
R/W
R/W
R/W
0
0
SSP0CPSR - 0xE006 8010
SSP1CPSR - 0xE003 0010
Interrupt Mask Set and Clear Register
Raw Interrupt Status Register
Masked Interrupt Status Register
SSPICR Interrupt Clear Register
DMA Control Register
SSP0IMSC - 0xE006 8014
SSP1IMSC - 0xE003 0014
SSP0RIS - 0xE006 8018
SSP1RIS - 0xE003 0018
MIS
0
SSP0MIS - 0xE006 801C
SSP1MIS - 0xE003 001C
ICR
NA
0
SSP0ICR - 0xE006 8020
SSP1ICR - 0xE003 0020
DMACR
SSP0DMACR - 0xE006 8024
SSP1DMACR - 0xE003 0024
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
6.1 SSPn Control Register 0 (SSP0CR0 - 0xE006 8000, SSP1CR0 - 0xE003
0000)
This register controls the basic operation of the SSP controller.
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Chapter 20: LPC24XX SSP interface SSP0/1
Table 471: SSPn Control Register 0 (SSP0CR0 - address 0xE006 8000, SSP1CR0 -
0xE003 0000) bit description
Bit
Symbol Value Description
Reset
Value
3:0
DSS Data Size Select. This field controls the number of bits
0000
transferred in each frame. Values 0000-0010 are not
supported and should not be used.
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
4 bit transfer
5 bit transfer
6 bit transfer
7 bit transfer
8 bit transfer
9 bit transfer
10 bit transfer
11 bit transfer
12 bit transfer
13 bit transfer
14 bit transfer
15 bit transfer
16 bit transfer
5:4
FRF
Frame Format.
00
00
01
10
11
SPI
TI
Microwire
This combination is not supported and should not be used.
Clock Out Polarity. This bit is only used in SPI mode.
SSP controller maintains the bus clock low between frames.
SSP controller maintains the bus clock high between frames.
Clock Out Phase. This bit is only used in SPI mode.
6
7
CPOL
CPHA
0
0
0
1
0
1
SSP controller captures serial data on the first clock transition
of the frame, that is, the transition away from the inter-frame
state of the clock line.
SSP controller captures serial data on the second clock
transition of the frame, that is, the transition back to the
inter-frame state of the clock line.
15:8 SCR
Serial Clock Rate. The number of prescaler-output clocks per 0x00
bit on the bus, minus one. Given that CPSDVSR is the
prescale divider, and the APB clock PCLK clocks the
prescaler, the bit frequency is PCLK / (CPSDVSR × [SCR+1]).
6.2 SSPn Control Register 1 (SSP0CR1 - 0xE006 8004, SSP1CR1 -
0xE003 0004)
This register controls certain aspects of the operation of the SSP controller.
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Chapter 20: LPC24XX SSP interface SSP0/1
Table 472: SSPn Control Register 1 (SSP0CR1 - address 0xE006 8004, SSP1CR1 -
0xE003 0004) bit description
Bit
Symbol Value
Description
Reset
Value
0
LBM
Loop Back Mode.
0
0
0
1
During normal operation.
Serial input is taken from the serial output (MOSI or MISO)
rather than the serial input pin (MISO or MOSI
respectively).
1
2
SSE
SSP Enable.
0
1
The SSP controller is disabled.
The SSP controller will interact with other devices on the
serial bus. Software should write the appropriate control
information to the other SSP registers and interrupt
controller registers, before setting this bit.
MS
Master/Slave Mode.This bit can only be written when the
SSE bit is 0.
0
0
The SSP controller acts as a master on the bus, driving the
SCLK, MOSI, and SSEL lines and receiving the MISO line.
0
1
The SSP controller acts as a slave on the bus, driving
MISO line and receiving SCLK, MOSI, and SSEL lines.
3
SOD
-
Slave Output Disable. This bit is relevant only in slave
mode (MS = 1). If it is 1, this blocks this SSP controller
from driving the transmit data line (MISO).
7:4
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
6.3 SSPn Data Register (SSP0DR - 0xE006 8008, SSP1DR - 0xE003 0008)
Software can write data to be transmitted to this register, and read data that has been
received.
Table 473: SSPn Data Register (SSP0DR - address 0xE006 8008, SSP1DR - 0xE003 0008) bit
description
Bit
Symbol Description
Reset Value
15:0 DATA
Write: software can write data to be sent in a future frame to this 0x0000
register whenever the TNF bit in the Status register is 1,
indicating that the Tx FIFO is not full. If the Tx FIFO was
previously empty and the SSP controller is not busy on the bus,
transmission of the data will begin immediately. Otherwise the
data written to this register will be sent as soon as all previous
data has been sent (and received). If the data length is less than
16 bits, software must right-justify the data written to this register.
Read: software can read data from this register whenever the
RNE bit in the Status register is 1, indicating that the Rx FIFO is
not empty. When software reads this register, the SSP controller
returns data from the least recent frame in the Rx FIFO. If the
data length is less than 16 bits, the data is right-justified in this
field with higher order bits filled with 0s.
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Chapter 20: LPC24XX SSP interface SSP0/1
6.4 SSPn Status Register (SSP0SR - 0xE006 800C, SSP1SR -
0xE003 000C)
This read-only register reflects the current status of the SSP controller.
Table 474: SSPn Status Register (SSP0SR - address 0xE006 800C, SSP1SR - 0xE003 000C)
bit description
Bit
Symbol
Description
Reset Value
0
TFE
Transmit FIFO Empty. This bit is 1 is the Transmit FIFO is
empty, 0 if not.
1
1
2
TNF
RNE
Transmit FIFO Not Full. This bit is 0 if the Tx FIFO is full, 1 if not. 1
Receive FIFO Not Empty. This bit is 0 if the Receive FIFO is
empty, 1 if not.
0
0
0
3
4
RFF
BSY
Receive FIFO Full. This bit is 1 if the Receive FIFO is full, 0 if
not.
Busy. This bit is 0 if the SSPn controller is idle, or 1 if it is
currently sending/receiving a frame and/or the Tx FIFO is not
empty.
7:5
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.5 SSPn Clock Prescale Register (SSP0CPSR - 0xE006 8010, SSP1CPSR
- 0xE003 0010)
This register controls the factor by which the Prescaler divides the SSP peripheral clock
SSP_PCLK to yield the prescaler clock that is, in turn, divided by the SCR factor in
SSPnCR0, to determine the bit clock.
Table 475: SSPn Clock Prescale Register (SSP0CPSR - address 0xE006 8010, SSP1CPSR -
0xE003 8010) bit description
Bit
Symbol
Description
Reset Value
7:0
CPSDVSR This even value between 2 and 254, by which SSP_PCLK is
divided to yield the prescaler output clock. Bit 0 always reads
as 0.
0
Important: the SSPnCPSR value must be properly initialized or the SSP controller will not
be able to transmit data correctly.
In Slave mode, the SSP clock rate provided by the master must not exceed 1/12 of the
is not relevant.
In master mode, CPSDVSRmin = 2 or larger (even numbers only).
6.6 SSPn Interrupt Mask Set/Clear Register (SSP0IMSC - 0xE006 8014,
SSP1IMSC - 0xE003 0014)
This register controls whether each of the four possible interrupt conditions in the SSP
controller are enabled. Note that ARM uses the word “masked” in the opposite sense from
classic computer terminology, in which “masked” meant “disabled”. ARM uses the word
“masked” to mean “enabled”. To avoid confusion we will not use the word “masked”.
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Chapter 20: LPC24XX SSP interface SSP0/1
Table 476: SSPn Interrupt Mask Set/Clear register (SSP0IMSC - address 0xE006 8014,
SSP1IMSC - 0xE003 0014) bit description
Bit
Symbol
Description
Reset
Value
0
RORIM
Software should set this bit to enable interrupt when a Receive
Overrun occurs, that is, when the Rx FIFO is full and another frame is
completely received. The ARM spec implies that the preceding frame
data is overwritten by the new frame data when this occurs.
0
1
RTIM
Software should set this bit to enable interrupt when a Receive
Timeout condition occurs. A Receive Timeout occurs when the Rx
FIFO is not empty, and no has not been read for a "timeout period".
0
2
RXIM
TXIM
-
Software should set this bit to enable interrupt when the Rx FIFO is at
least half full.
0
0
3
Software should set this bit to enable interrupt when the Tx FIFO is at
least half empty.
7:4
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
6.7 SSPn Raw Interrupt Status Register (SSP0RIS - 0xE006 8018,
SSP1RIS - 0xE003 0018)
This read-only register contains a 1 for each interrupt condition that is asserted,
regardless of whether or not the interrupt is enabled in the SSPnIMSC.
Table 477: SSPn Raw Interrupt Status register (SSP0RIS - address 0xE006 8018, SSP1RIS -
0xE003 0018) bit description
Bit
Symbol
Description
Reset Value
0
RORRIS
This bit is 1 if another frame was completely received while the
RxFIFO was full. The ARM spec implies that the preceding
frame data is overwritten by the new frame data when this
occurs.
0
1
RTRIS
This bit is 1 if the Rx FIFO is not empty, and has not been read
for a "timeout period".
0
2
RXRIS
TXRIS
-
This bit is 1 if the Rx FIFO is at least half full.
This bit is 1 if the Tx FIFO is at least half empty.
0
3
1
7:4
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.8 SSPn Masked Interrupt Status Register (SSP0MIS - 0xE006 801C,
SSP1MIS - 0xE003 001C)
This read-only register contains a 1 for each interrupt condition that is asserted and
enabled in the SSPnIMSC. When an SSP interrupt occurs, the interrupt service routine
should read this register to determine the cause(s) of the interrupt.
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Chapter 20: LPC24XX SSP interface SSP0/1
Table 478: SSPn Masked Interrupt Status register (SSPnMIS -address 0xE006 801C,
SSP1MIS - 0xE003 001C) bit description
Bit
Symbol
Description
Reset Value
0
RORMIS
This bit is 1 if another frame was completely received while the
RxFIFO was full, and this interrupt is enabled.
0
1
RTMIS
RXMIS
TXMIS
-
This bit is 1 if the Rx FIFO is not empty, has not been read for
a "timeout period", and this interrupt is enabled.
0
2
This bit is 1 if the Rx FIFO is at least half full, and this interrupt
is enabled.
0
3
This bit is 1 if the Tx FIFO is at least half empty, and this
interrupt is enabled.
0
7:4
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.9 SSPn Interrupt Clear Register (SSP0ICR - 0xE006 8020, SSP1ICR -
0xE003 0020)
Software can write one or more one(s) to this write-only register, to clear the
corresponding interrupt condition(s) in the SSP controller. Note that the other two interrupt
conditions can be cleared by writing or reading the appropriate FIFO, or disabled by
clearing the corresponding bit in SSPnIMSC.
Table 479: SSPn interrupt Clear Register (SSP0ICR - address 0xE006 8020, SSP1ICR -
0xE003 0020) bit description
Bit
Symbol
Description
Reset Value
0
RORIC
Writing a 1 to this bit clears the “frame was received when
RxFIFO was full” interrupt.
NA
1
RTIC
-
Writing a 1 to this bit clears the "Rx FIFO was not empty and NA
has not been read for a timeout period" interrupt.
7:2
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.10 SSPn DMA Control Register (SSP0DMACR - 0xE006 8024,
SSP1DMACR - 0xE003 0024)
The SSPnDMACR register is the DMA control register.It is a read/write register.
Table 480: SSPn DMA Control Register (SSP0DMACR - address 0xE006 8024, SSP1DMACR -
0xE003 0024) bit description
Bit
Symbol
Description
Reset
Value
0
Receive DMA
Enable
When this bit is set to one 1, DMA for the receive FIFO is
enabled, otherwise receive DMA is disabled.
0
(RXDMAE)
1
Transmit DMA
Enable
When this bit is set to one 1, DMA for the transmit FIFO is
enabled, otherwise transmit DMA is disabled
0
(TXDMAE)
15:2
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
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Chapter 21: LPC24XX SD/MMC card interface
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User manual
1. Basic configuration
The SD/MMC is configured using the following registers:
Remark: On reset, the SD/MMC is disabled (PCMCI = 0).
3. Pins: Select SD/MMC pins and their modes in PINSEL0 to PINSEL4 and PINMODE0
4. Interrupts: Interrupts are enabled in the VIC using the VICIntEnable register
2. Introduction
The Secure Digital and Multimedia Card Interface (MCI) is an interface between the
Advanced Peripheral Bus (APB) system bus and multimedia and/or secure digital memory
cards. It consists of two parts:
• The MCI adapter block provides all functions specific to the Secure Digital/MultiMedia
memory card, such as the clock generation unit, power management control,
command and data transfer.
• The APB interface accesses the MCI adapter registers, and generates interrupt and
DMA request signals.
3. Features of the MCI
The following features are provided by the MCI:
• Conformance to Multimedia Card Specification v2.11.
• Conformance to Secure Digital Memory Card Physical Layer Specification, v0.96.
• Use as a multimedia card bus or a secure digital memory card bus host. It can be
connected to several multimedia cards, or a single secure digital memory card.
• DMA supported through the General Purpose DMA Controller.
4. SD/MMC card interface pin description
Table 481. SD/MMC card interface pin description
Pin Name
MCICLK
Type
Description
Output
Input
Clock output
MCICMD
MCIDAT[3:0]
MCIPWR
Command input/output.
Output
Output
Data lines. Only MCIDAT[0] is used for Multimedia cards.
Power Supply Enable for external SD/MMC power supply.
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Chapter 21: LPC24XX SD/MMC card interface
There is one additional signal needed in the interface, a power control line MCIPWR, but it
can be sourced from any GPIO signal.
5. Functional overview
The MCI may be used as a multimedia card bus host (see Section 21–5.1 “Mutimedia
memory card”). Up to 4 multimedia cards (depending on board loading) or a single secure
digital memory card may be connected.
5.1 Mutimedia card
Figure 21–104 shows the multimedia card system.
MULTIMEDIA
CARD
INTERFACE
POWER
SUPPLY
MULTIMEDIA CARD BUS
CARD
CARD
CARD
MULTIMEDIA CARD STACK
Fig 104. Multimedia card system
Multimedia cards are grouped into three types according to their function:
• Read Only Memory (ROM) cards, containing pre-programmed data
• Read/Write (R/W) cards, used for mass storage
• Input/Output (I/O) cards, used for communication
The multimedia card system transfers commands and data using three signal lines:
• CLK: One bit is transferred on both command and data lines with each clock cycle.
The clock frequency varies between 0 MHz and 20 MHz (for a multimedia card) or
0 MHz and 25 MHz (for a secure digital memory card).
• CMD: Bidirectional command channel that initializes a card and transfers commands.
CMD has two operational modes:
– Open-drain for initialization
– Push-pull for command transfer
• DAT: Bidirectional data channel, operating in push-pull mode
5.2 Secure digital memory card
Figure 21–105 shows the secure digital memory card connection.
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Chapter 21: LPC24XX SD/MMC card interface
CLK
SECURE
DIGITAL
MEMORY CARD
CONTROLLER
SECURE
DIGITAL
MEMORY CARD
D[3:0]
CMD
Fig 105. Secure digital memory card connection
5.2.1 Secure digital memory card bus signals
The following signals are used on the secure digital memory card bus:
• CLK Host to card clock signal
• CMD Bidirectional command/response signal
• DAT[3:0] Bidirectional data signals
5.3 MCI adapter
Figure 21–106 shows a simplified block diagram of the MCI adapter.
MULTIMEDIA CARD INTERFACE
MCICLK
CONTROL
UNIT
MCIPWR
MCICMD
COMMAND
PATH
APB
INTERFACE
ADAPTER
REGISTERS
APB BUS
MCIDATA [3:0]
DATA PATH
FIFO
Fig 106. MCI adapter
The MCI adapter is a multimedia/secure digital memory card bus master that provides an
interface to a multimedia card stack or to a secure digital memory card. It consists of five
subunits:
• Adapter register block
• Control unit
• Command path
• Data path
• Data FIFO
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Chapter 21: LPC24XX SD/MMC card interface
5.3.1 Adapter register block
The adapter register block contains all system registers. This block also generates the
signals that clear the static flags in the multimedia card. The clear signals are generated
when 1 is written into the corresponding bit location of the MCIClear register.
5.3.2 Control unit
The control unit contains the power management functions and the clock divider for the
memory card clock.
There are three power phases:
• Power-off
• Power-up
• Power-on
The power management logic controls an external power supply unit, and disables the
card bus output signals during the power-off or power-up phases. The power-up phase is
a transition phase between the power-off and power-on phases, and allows an external
power supply to reach the card bus operating voltage. A device driver is used to ensure
that the PrimeCell MCI remains in the power-up phase until the external power supply
reaches the operating voltage.
The clock management logic generates and controls the MCICLK signal. The MCICLK
output can use either a clock divide or clock bypass mode. The clock output is inactive:
• after reset
• during the power-off or power-up phases
• if the power saving mode is enabled and the card bus is in the IDLE state (eight clock
periods after both the command and data path subunits enter the IDLE phase)
5.3.3 Command path
The command path subunit sends commands to and receives responses from the cards.
5.3.4 Command path state machine
When the command register is written to and the enable bit is set, command transfer
starts. When the command has been sent, the Command Path State Machine (CPSM)
sets the status flags and enters the IDLE state if a response is not required. If a response
the received CRC code and the internally generated code are compared, and the
appropriate status flags are set.
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Chapter 21: LPC24XX SD/MMC card interface
IDLE
Response received
or disabled or
command CRC failed
Enabled and
Pending command
Disabled
RECEIVE
Disabled or
no response
PEND
Disabled
Enabled and
or timeout
command start
Response
started
LastData
SEND
WAIT
Wait for
response
Fig 107. Command path state machine
When the WAIT state is entered, the command timer starts running. If the timeout1 is
reached before the CPSM moves to the RECEIVE state, the timeout flag is set and the
IDLE2 state is entered.
If the interrupt bit is set in the command register, the timer is disabled and the CPSM waits
for an interrupt request from one of the cards. If a pending bit is set in the command
register, the CPSM enters the PEND state, and waits for a CmdPend signal from the data
path subunit. When CmdPend is detected, the CPSM moves to the SEND state. This
enables the data counter to trigger the stop command transmission.
Figure 21–108 shows the MCI command transfer.
min 8
MCICLK
MCICLK
State
COMMAND
SEND
RESPONSE
RECEIVE
COMMAND
SEND
IDLE
HI-Z
WAIT
HI-Z
IDLE
HI-Z
MCICMD
controller drives
card drives
controller drives
Fig 108. MCI command transfer
1. The timeout period has a fixed value of 64 MCICLK clocks period.
2. The CPSM remains in the IDLE state for at least eight MCICLK periods to meet Ncc and Nrc timing constraints.
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Chapter 21: LPC24XX SD/MMC card interface
5.3.5 Command format
The command path operates in a half-duplex mode, so that commands and responses
can either be sent or received. If the CPSM is not in the SEND state, the MCICMD output
command format.
Table 482. Command format
Bit Position
Width
Value
Description
End bit.
0
1
1
-
7:1
39:8
45:40
46
7
CRC7
32
6
-
Argument.
Command index.
Transmission bit.
Stat bit.
-
1
1
0
47
1
The MCI adapter supports two response types. Both use CRC error checking:
Note: If the response does not contain CRC (CMD1 response), the device driver must
ignore the CRC failed status.
Table 483. Simple response format
Bit Position
Width
Value
Description
End bit.
0
1
1
-
7:1
39:8
45:40
46
7
CRC7 (or 1111111).
Argument.
32
6
-
-
Command index.
Transmission bit.
Start bit.
1
0
0
47
1
Table 484. Long response format
Bit Position
0
Width
Value
Description
1
1
End bit.
127:1
133:128
134
127
6
-
CID or CSD (including internal CRC7).
Reserved.
111111
1
1
0
Transmission bit.
Start bit.
135
1
The command register contains the command index (six bits sent to a card) and the
command type. These determine whether the command requires a response, and
whether the response is 48 or 136 bits long (see Section 21–6.4 “Command Register
(MCICommand - 0xE008 C00C)” for more information). The command path implements
- 0xE008 C034)” for more information).
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Table 485. Command path status flags
Flag
Description
CmdRespEnd
CmdCrcFail
CmdSent
Set if response CRC is OK.
Set if response CRC fails.
Set when command (that does not require response) is sent.
Response timeout.
CmdTimeOut
CmdActive
Command transfer in progress.
The CRC generator calculates the CRC checksum for all bits before the CRC code. This
includes the start bit, transmitter bit, command index, and command argument (or card
status). The CRC checksum is calculated for the first 120 bits of CID or CSD for the long
response format. Note that the start bit, transmitter bit and the six reserved bits are not
used in the CRC calculation.
The CRC checksum is a 7 bit value:
CRC[6:0] = Remainder [(M(x) × x7 ) / G(x)]
G(x) = x7 + x3 + 1
M(x) = (start bit) × x39 + ... + (last bit before CRC) × x0 , or
M(x) = (start bit) × x119 + ... + (last bit before CRC) × x0
5.3.6 Data path
The card data bus width can be programmed using the clock control register. If the wide
bus mode is enabled, data is transferred at four bits per clock cycle over all four data
signals (MCIDAT[3:0]). If the wide bus mode is not enabled, only one bit per clock cycle is
transferred over MCIDAT0.
Depending on the transfer direction (send or receive), the Data Path State Machine
(DPSM) moves to the WAIT_S or WAIT_R state when it is enabled:
• Send: The DPSM moves to the WAIT_S state. If there is data in the send FIFO, the
DPSM moves to the SEND state, and the data path subunit starts sending data to a
card.
• Receive: The DPSM moves to the WAIT_R state and waits for a start bit. When it
receives a start bit, the DPSM moves to the RECEIVE state, and the data path subunit
starts receiving data from a card.
5.3.7 Data path state machine
The DPSM operates at MCICLK frequency. Data on the card bus signals is synchronous
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Reset
IDLE
Disabled or
CRC fail or
timeout
Disabled or
FIFO underrun or
end of data or
CRC fail
Disabled or
Rx FIFO empty
or timeout or
start bit error
Enable and
not send
Disabled or
CRC fail
Disabled or
end of data
Enable
WAIT_R
BUSY
and send
Not busy
End of packet
WAIT_S
or end of data
End of packet
or FIFO overrun
Start bit
Data ready
SEND
RECEIVE
Fig 109. Data path state machine
• IDLE: The data path is inactive, and the MCIDAT[3:0] outputs are in HI-Z. When the
data control register is written and the enable bit is set, the DPSM loads the data
counter with a new value and, depending on the data direction bit, moves to either the
WAIT_S or WAIT_R state.
WAIT_R: If the data counter equals zero, the DPSM moves to the IDLE state when
the receive FIFO is empty. If the data counter is not zero, the DPSM waits for a start
bit on MCIDAT.
The DPSM moves to the RECEIVE state if it receives a start bit before a timeout, and
loads the data block counter. If it reaches a timeout before it detects a start bit, or a start
bit error occurs, it moves to the IDLE state and sets the timeout status flag.
• RECEIVE: Serial data received from a card is packed in bytes and written to the data
FIFO. Depending on the transfer mode bit in the data control register, the data transfer
mode can be either block or stream:
– In block mode, when the data block counter reaches zero, the DPSM waits until it
receives the CRC code. If the received code matches the internally generated
CRC code, the DPSM moves to the WAIT_R state. If not, the CRC fail status flag is
set and the DPSM moves to the IDLE state.
– In stream mode, the DPSM receives data while the data counter is not zero. When
the counter is zero, the remaining data in the shift register is written to the data
FIFO, and the DPSM moves to the WAIT_R state.
If a FIFO overrun error occurs, the DPSM sets the FIFO error flag and moves to the
WAIT_R state.
• WAIT_S: The DPSM moves to the IDLE state if the data counter is zero. If not, it waits
until the data FIFO empty flag is deasserted, and moves to the SEND state.
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Note: The DPSM remains in the WAIT_S state for at least two clock periods to meet Nwr
timing constraints.
• SEND: The DPSM starts sending data to a card. Depending on the transfer mode bit
in the data control register, the data transfer mode can be either block or stream:
– In block mode, when the data block counter reaches zero, the DPSM sends an
internally generated CRC code and end bit, and moves to the BUSY state.
– In stream mode, the DPSM sends data to a card while the enable bit is HIGH and
the data counter is not zero. It then moves to the IDLE state.
If a FIFO underrun error occurs, the DPSM sets the FIFO error flag and moves to the
IDLE state.
• BUSY: The DPSM waits for the CRC status flag:
– If it does not receive a positive CRC status, it moves to the IDLE state and sets the
CRC fail status flag.
– If it receives a positive CRC status, it moves to the WAIT_S state if MCIDAT0 is not
LOW (the card is not busy).
If a timeout occurs while the DPSM is in the BUSY state, it sets the data timeout flag and
moves to the IDLE state.
The data timer is enabled when the DPSM is in the WAIT_R or BUSY state, and
generates the data timeout error:
• When transmitting data, the timeout occurs if the DPSM stays in the BUSY state for
longer than the programmed timeout period
• When receiving data, the timeout occurs if the end of the data is not true, and if the
DPSM stays in the WAIT_R state for longer than the programmed timeout period.
5.3.8 Data counter
The data counter has two functions:
• To stop a data transfer when it reaches zero. This is the end of the data condition.
the stop command for a stream data transfer.
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MCICLK
MCICMD
cmd state
MCIDAT0
3
Z
2
Z
1
PEND
Z
0
Z
7
Z
6
5
4
3
2
1
SEND
S
CMD
CMD
6
CMD
CMD
CMD
data
counter
7
CmdPend
Fig 110. Pending command start
The data block counter determines the end of a data block. If the counter is zero, the
end-of-data condition is TRUE (see Section 21–6.9 “Data Control Register (MCIDataCtrl -
0xE008 C02C)” for more information).
5.3.9 Bus mode
In wide bus mode, all four data signals (MCIDAT[3:0]) are used to transfer data, and the
CRC code is calculated separately for each data signal. While transmitting data blocks to
a card, only MCIDAT0 is used for the CRC token and busy signalling. The start bit must be
transmitted on all four data signals at the same time (during the same clock period). If the
start bit is not detected on all data signals on the same clock edge while receiving data,
the DPSM sets the start bit error flag and moves to the IDLE state.
The data path also operates in half-duplex mode, where data is either sent to a card or
received from a card. While not being transferred, MCIDAT[3:0] are in the HI-Z state.
Data on these signals is synchronous to the rising edge of the clock period.
If standard bus mode is selected the MCIDAT[3:1] outputs are always in HI-Z state and
only the MCIDAT0 output is driven LOW when data is transmitted.
Design note: If wide mode is selected, both nMCIDAT0EN and nMCIDATEN outputs are
driven low at the same time. If not, the MCIDAT[3:1] outputs are always in HI-Z state
(nMCIDATEN) is driven HIGH), and only the MCIDAT0 output is driven LOW when data is
transmitted.
5.3.10 CRC Token status
The CRC token status follows each write data block, and determines whether a card has
received the data block correctly. When the token has been received, the card asserts a
Table 486. CRC token status
Token
010
Description
Card has received error-free data block.
Card has detected a CRC error.
101
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5.3.11 Status flags
(MCIStatus - 0xE008 C034)” on page 569 for more information).
Table 487. Data path status flags
Flag
Description
TxFifoFull
Transmit FIFO is full.
TxFifoEmpty
TxFifoHalfEmpty
TxDataAvlbl
TxUnderrun
RxFifoFull
Transmit FIFO is empty.
Transmit FIFO is half full.
Transmit FIFO data available.
Transmit FIFO underrun error.
Receive FIFO is full.
RxFifoEmpty
RxFifoHalfFull
RxDataAvlbl
RxOverrun
DataBlockEnd
StartBitErr
Receive FIFO is empty.
Receive FIFO is half full.
Receive FIFO data available.
Receive FIFO overrun error.
Data block sent/received.
Start bit not detected on all data signals in wide bus mode.
Data packet CRC failed.
Data end (data counter is zero).
Data timeout.
DataCrcFail
DataEnd
DataTimeOut
TxActive
Data transmission in progress.
Data reception in progress.
RxActive
5.3.12 CRC generator
The CRC generator calculates the CRC checksum only for the data bits in a single block,
and is bypassed in data stream mode. The checksum is a 16 bit value:
CRC[15:0] = Remainder [(M(x) × x15) / G(x)]
G(x) = x16 + x12 + x5 + 1
M(x) - (first data bit) × xn + ... + (last data bit) ¥ X0
5.3.13 Data FIFO
The data FIFO (first-in-first-out) subunit is a data buffer with transmit and receive logic.
The FIFO contains a 32 bit wide, 16-word deep data buffer, and transmit and receive
logic. Because the data FIFO operates in the APB clock domain (PCLK), all signals from
the subunits in the MCI clock domain (MCLK) are resynchronized.
Depending on TxActive and RxActive, the FIFO can be disabled, transmit enabled, or
receive enabled. TxActive and RxActive are driven by the data path subunit and are
mutually exclusive:
• The transmit FIFO refers to the transmit logic and data buffer when TxActive is
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• The receive FIFO refers to the receive logic and data buffer when RxActive is
5.3.14 Transmit FIFO
Data can be written to the transmit FIFO through the APB interface once the MCI is
enabled for transmission.
The transmit FIFO is accessible via 16 sequential addresses (see Section 21–6.15 “Data
FIFO Register (MCIFIFO - 0xE008 C080 to 0xE008 C0BC)”). The transmit FIFO contains
a data output register that holds the data word pointed to by the read pointer. When the
data path subunit has loaded its shift register, it increments the read pointer and drives
new data out.
If the transmit FIFO is disabled, all status flags are deasserted. The data path subunit
Table 488. Transmit FIFO status flags
Flag
Description
TxFifoFull
TxFifoEmpty
TxHalfEmpty
Set to HIGH when all 16 transmit FIFO words contain valid data.
Set to HIGH when the transmit FIFO does not contain valid data.
Set to HIGH when 8 or more transmit FIFO words are empty. This flag
can be used as a DMA request.
TxDataAvlbl
TxUnderrun
Set to HIGH when the transmit FIFO contains valid data. This flag is the
inverse of the TxFifoEmpty flag.
Set to HIGH when an underrun error occurs. This flag is cleared by
writing to the MCIClear register.
5.3.15 Receive FIFO
When the data path subunit receives a word of data, it drives data on the write data bus
and asserts the write enable signal. This signal is synchronized to the PCLK domain. The
write pointer is incremented after the write is completed, and the receive FIFO control
logic asserts RxWrDone, that then deasserts the write enable signal.
On the read side, the content of the FIFO word pointed to by the current value of the read
pointer is driven on the read data bus. The read pointer is incremented when the APB bus
interface asserts RxRdPrtInc.
If the receive FIFO is disabled, all status flags are deasserted, and the read and write
pointers are reset. The data path subunit asserts RxActive when it receives data. Table
353 lists the receive FIFO status flags.
The receive FIFO is accessible via 16 sequential addresses (see Section 21–6.15 “Data
If the receive FIFO is disabled, all status flags are deasserted, and the read and write
pointers are reset. The data path subunit asserts RxActive when it receives data.
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Table 489. Receive FIFO status flags
Symbol Description
RxFifoFull
RxFifoEmpty
RxHalfFull
Set to HIGH when all 16 receive FIFO words contain valid data.
Set to HIGH when the receive FIFO does not contain valid data.
Set to HIGH when 8 or more receive FIFO words contain valid data. This
flag can be used as a DMA request.
RxDataAvlbl
RxOverrun
Set to HIGH when the receive FIFO is not empty. This flag is the inverse
of the RxFifoEmpty flag.
Set to HIGH when an overrun error occurs. This flag is cleared by writing
to the MCIClear register.
5.3.16 APB interfaces
The APB interface generates the interrupt and DMA requests, and accesses the MCI
adapter registers and the data FIFO. It consists of a data path, register decoder, and
interrupt/DMA logic. DMA is controlled by the General Purpose DMA controller, see that
chapter for details.
5.3.17 Interrupt logic
The interrupt logic generates an interrupt request signal that is asserted when at least one
of the selected status flags is HIGH. A mask register is provided to allow selection of the
conditions that will generate an interrupt. A status flag generates the interrupt request if a
corresponding mask flag is set.
6. Register description
Table 490. Summary of MCI registers
Name
Description
Access Width Reset
Value[1]
Address
MCIPower
MCIClock
Power control register.
Clock control register.
Argument register.
R/W
R/W
R/W
R/W
RO
8
0x00
0xE008 C000
0xE008 C004
12
32
11
6
0x000
MCIArgument
0x00000000 0xE008 C008
MMCCommand Command register.
0x000
0x00
0xE008 C00C
0xE008 C010
MCIRespCmd
Response command register.
MCIResponse0 Response register.
MCIResponse1 Response register.
MCIResponse2 Response register.
MCIResponse3 Response register.
MCIDataTimer Data Timer.
RO
32
32
32
31
32
16
8
0x00000000 0xE008 C014
0x00000000 0xE008 C018
0x00000000 0xE008 C01C
0x00000000 0xE008 C020
0x00000000 0xE008 C024
RO
RO
RO
R/W
R/W
R/W
RO
MCIDataLength Data control register.
0x0000
0x00
0xE008 C028
0xE008 C02C
0xE008 C030
0xE008 C034
0xE008 C038
MCIDataCtrl
MCIDataCnt
MCIStatus
MCIClear
Data control register.
Data counter.
16
22
11
0x0000
0x000000
-
Status register.
Clear register.
RO
WO
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Table 490. Summary of MCI registers
Name
Description
Access Width Reset
Value[1]
Address
MCIMask0
MCIFifoCnt
MCIFIFO
Interrupt 0 mask register.
FIFO Counter.
R/W
RO
22
15
32
0x000000
0x0000
0xE008 C03C
0xE008 C048
Data FIFO Register.
R/W
0x00000000 0xE008 C080
to
0xE008 C0BC
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
6.1 Power Control Register (MCI Power - 0xE008 C000)
The MCIPower register controls an external power supply. Power can be switched on and
MCIPower register.
The active level of the MCIPWR (Power Supply Enable) pin can be selected by bit 3 of the
SCS register (see Section 3–7.1 “System Controls and Status register (SCS - 0xE01F
C1A0)” on page 36 for details).
Table 491: Power Control register (MCIPower - address 0xE008 C000) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
Ctrl
00
01
10
11
Power-off
Reserved
Power-up
Power-on
00
5:2
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
6
OpenDrain
MCICMD output control.
Rod control.
0
7
Rod
-
0
31:8
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
When the external power supply is switched on, the software first enters the power-up
phase, and waits until the supply output is stable before moving to the power-on phase.
During the power-up phase, MCIPWR is set HIGH. The card bus outlets are disabled
during both phases.
Note: After a data write, data cannot be written to this register for three MCLK clock
periods plus two PCLK clock periods.
6.2 Clock Control Register (MCIClock - 0xE008 C004)
assignment of the clock control register.
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Table 492: Clock Control register (MCIClock - address 0xE008 C004) bit description
Bit
Symbol
Value Description
Reset
Value
7:0
ClkDiv
MCI bus clock period:
0x00
MCLCLK frequency = MCLK / [2×(ClkDiv+1)].
Enable MCI bus clock:
8
Enable
PwrSave
Bypass
WideBus
-
0
0
1
Clock disabled.
Clock enabled.
9
Disable MCI clock output when bus is idle:
Always enabled.
0
0
1
Clock enabled when bus is active.
Enable bypass of clock divide logic:
Disable bypass.
10
11
0
0
1
Enable bypass. MCLK driven to card bus output (MCICLK).
Enable wide bus mode:
0
0
1
Standard bus mode (only MCIDAT0 used).
Wide bus mode (MCIDAT3:0 used)
31:12
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
While the MCI is in identification mode, the MCICLK frequency must be less than
400 kHz. The clock frequency can be changed to the maximum card bus frequency when
relative card addresses are assigned to all cards.
Note: After a data write, data cannot be written to this register for three MCLK clock
periods plus two PCLK clock periods.
6.3 Argument Register (MCIArgument - 0xE008 C008)
The MCIArgument register contains a 32 bit command argument, which is sent to a card
MCIArgument register.
Table 493: Argument register (MCIArgument - address 0xE008 C008) bit description
Bit
Symbol
Description
Reset Value
31:0
CmdArg
Command argument
0x0000 0000
If a command contains an argument, it must be loaded into the argument register before
writing a command to the command register.
6.4 Command Register (MCICommand - 0xE008 C00C)
The MCICommand register contains the command index and command type bits:
• The command index is sent to a card as part of a command message.
• The command type bits control the Command Path State Machine (CPSM). Writing 1
to the enable bit starts the command send operation, while clearing the bit disables
the CPSM.
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Table 494: Command register (MCICommand - address 0xE008 C00C) bit description
Bit
Symbol
Description
Reset
Value
5:0
6
CmdIndex Command index.
0
0
0
Response If set, CPSM waits for a response.
LongRsp If set, CPSM receives a 136 bit long response.
7
8
Interrupt
Pending
Enable
-
If set, CPSM disables command timer and waits for interrupt request. 0
If set, CPSM waits for CmdPend before it starts sending a command. 0
If set, CPSM is enabled.
9
10
31:11
0
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
Note: After a data write, data cannot be written to this register for three MCLK clock
periods plus two PCLK clock periods.
Table 495: Command Response Types
Response
Long Response Description
0
0
1
1
0
1
0
1
No response, expect CmdSent flag.
No response, expect CmdSent flag.
Short response, expect CmdRespEnd or CmdCrcFail flag.
Long response, expect CmdRespEnd or CmdCrcFail flag.
6.5 Command Response Register (MCIRespCommand - 0xE008 C010)
The MCIRespCommand register contains the command index field of the last command
register.
Table 496: Command Response register (MCIRespCommand - address 0xE008 C010) bit
description
Bit
Symbol
Description
Reset
Value
5:0
RespCmd Response command index
0x00
31:6
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
If the command response transmission does not contain the command index field (long
response), the RespCmd field is unknown, although it must contain 111111 (the value of
the reserved field from the response).
6.6 Response Registers (MCIResponse0-3 - 0xE008 C014, E008 C018,
E008 C01C and E008 C020)
The MCIResponse0-3 registers contain the status of a card, which is part of the received
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Table 497: Response registers (MCIResponse0-3 - addresses 0xE008 0014, 0xE008 C018,
0xE008 001C and 0xE008 C020) bit description
Bit Symbol Description
31:0 Status Card status
Reset Value
0x0000 0000
The card status size can be 32 or 127 bits, depending on the response type (see
Table 498: Response Register Type
Description
Short Response
Card status [31:0]
Unused
Long Response
Card status [127:96]
Card status [95:64]
Card status [63:32]
Card status [31:1]
MCIResponse0
MCIResponse1
MCIResponse2
MCIResponse3
Unused
Unused
The most significant bit of the card status is received first. The MCIResponse3 register
LSBit is always 0.
6.7 Data Timer Register (MCIDataTimer - 0xE008 C024)
The MCIDataTimer register contains the data timeout period, in card bus clock periods.
Table 499: Data Timer register (MCIDataTimer - address 0xE008 C024) bit description
Bit
Symbol
Description
Reset Value
31:0
DataTime Data timeout period.
0x0000 0000
A counter loads the value from the data timer register, and starts decrementing when the
Data Path State Machine (DPSM) enters the WAIT_R or BUSY state. If the timer reaches
0 while the DPSM is in either of these states, the timeout status flag is set.
A data transfer must be written to the data timer register and the data length register
before being written to the data control register.
6.8 Data Length Register (MCIDataLength - 0xE008 C028)
The MCIDataLength register contains the number of data bytes to be transferred. The
bit assignment of the MCIDataLength register.
Table 500: Data Length register (MCIDataLength - address 0xE008 C028) bit description
Bit
Symbol
Description
Reset
Value
15:0
DataLength Data length value
0x0000
31:16
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
For a block data transfer, the value in the data length register must be a multiple of the
To initiate a data transfer, write to the data timer register and the data length register
before writing to the data control register.
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6.9 Data Control Register (MCIDataCtrl - 0xE008 C02C)
the MCIDataCtrl register.
Table 501: Data Control register (MCIDataCtrl - address 0xE008 C02C) bit description
Bit
Symbol
Value Description
Reset
Value
0
1
Enable
Data transfer enable.
0
0
Direction
Data transfer direction:
From controller to card.
From card to controller.
Data transfer mode:
Block data transfer.
Stream data transfer.
Enable DMA:
0
1
2
3
Mode
0
0
0
1
DMAEnable
0
1
DMA disabled.
DMA enabled.
7:4 BlockSize
31:8
Data block length
0
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
Note: After a data write, data cannot be written to this register for three MCLK clock
periods plus two PCLK clock periods.
Data transfer starts if 1 is written to the enable bit. Depending on the direction bit, the
DPSM moves to the WAIT_S or WAIT_R state. It is not necessary to clear the enable bit
after the data transfer. BlockSize controls the data block length if Mode is 0, as shown in
Table 502: Data Block Length
Block Size
Block Length
20= 1 byte.
21 = 2 bytes.
-
0
1
...
11
211 = 2048 bytes.
12:15
Reserved.
6.10 Data Counter Register (MCIDataCnt - 0xE008 C030)
The MCIDataCnt register loads the value from the data length register (see Section
21–6.8 “Data Length Register (MCIDataLength - 0xE008 C028)”) when the DPSM moves
from the IDLE state to the WAIT_R or WAIT_S state. As data is transferred, the counter
decrements the value until it reaches 0. The DPSM then moves to the IDLE state and the
register.
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Chapter 21: LPC24XX SD/MMC card interface
Table 503: Data Counter register (MCIDataCnt - address 0xE008 C030) bit description
Bit
Symbol
Description
Reset
Value
15:0
DataCount Remaining data
0x0000
31:16
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
Note: This register should be read only when the data transfer is complete.
6.11 Status Register (MCIStatus - 0xE008 C034)
The MCIStatus register is a read-only register. It contains two types of flag:
• Static [10:0]: These remain asserted until they are cleared by writing to the Clear
• Dynamic [21:11]: These change state depending on the state of the underlying logic
(for example, FIFO full and empty flags are asserted and deasserted as data while
written to the FIFO).
Table 504: Status register (MCIStatus - address 0xE008 C034) bit description
Bit
Symbol
Description
Reset
Value
0
CmdCrcFail
DataCrcFail
CmdTimeOut
DataTimeOut
TxUnderrun
RxOverrun
CmdRespEnd
CmdSent
Command response received (CRC check failed).
Data block sent/received (CRC check failed).
Command response timeout.
0
0
0
0
0
0
0
0
0
1
2
3
Data timeout.
4
Transmit FIFO underrun error.
5
Receive FIFO overrun error.
6
Command response received (CRC check passed).
Command sent (no response required).
Data end (data counter is zero).
7
8
DataEnd
9
StartBitErr
Start bit not detected on all data signals in wide bus mode. 0
10
11
12
13
14
15
16
17
18
19
DataBlockEnd
CmdActive
TxActive
Data block sent/received (CRC check passed).
Command transfer in progress.
Data transmit in progress.
0
0
0
0
0
0
0
0
0
0
RxActive
Data receive in progress.
TxFifoHalfEmpty Transmit FIFO half empty.
RxFifoHalfFull
TxFifoFull
Receive FIFO half full.
Transmit FIFO full.
Receive FIFO full.
RxFifoFull
TxFifoEmpty
RxFifoEmpty
Transmit FIFO empty.
Receive FIFO empty.
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Chapter 21: LPC24XX SD/MMC card interface
Table 504: Status register (MCIStatus - address 0xE008 C034) bit description
Bit
Symbol
Description
Reset
Value
20
TxDataAvlbl
RxDataAvlbl
-
Data available in transmit FIFO.
Data available in receive FIFO.
0
0
21
31:22
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
6.12 Clear Register (MCIClear - 0xE008 C038)
The MCIClear register is a write-only register. The corresponding static status flags can be
assignment of the MCIClear register.
Table 505: Clear register (MCIClear - address 0xE008 C038) bit description
Bit
Symbol
Description
Reset
Value
0
CmdCrcFailClr
DataCrcFailClr
CmdTimeOutClr
DataTimeOutClr
TxUnderrunClr
RxOverrunClr
CmdRespEndClr
CmdSentClr
Clears CmdCrcFail flag.
Clears DataCrcFail flag.
Clears CmdTimeOut flag.
Clears DataTimeOut flag.
Clears TxUnderrun flag.
Clears RxOverrun flag.
Clears CmdRespEnd flag.
Clears CmdSent flag.
-
-
-
-
-
-
-
-
-
-
-
1
2
3
4
5
6
7
8
DataEndClr
Clears DataEnd flag.
9
StartBitErrClr
DataBlockEndClr
-
Clears StartBitErr flag.
Clears DataBlockEnd flag.
10
31:11
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
6.13 Interrupt Mask Registers (MCIMask0 - 0xE008 C03C)
The interrupt mask registers determine which status flags generate an interrupt request by
MCIMaskx registers.
Table 506: Interrupt Mask registers (MCIMask0 - address 0xE008 C03C) bit description
Bit
Symbol
Description
Reset
Value
0
1
2
3
4
5
6
7
Mask0
Mask1
Mask2
Mask3
Mask4
Mask5
Mask6
Mask7
Mask CmdCrcFail flag.
Mask DataCrcFail flag.
Mask CmdTimeOut flag.
Mask DataTimeOut flag.
Mask TxUnderrun flag.
Mask RxOverrun flag.
Mask CmdRespEnd flag.
Mask CmdSent flag.
0
0
0
0
0
0
0
0
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Table 506: Interrupt Mask registers (MCIMask0 - address 0xE008 C03C) bit description
Bit
Symbol
Description
Reset
Value
8
Mask8
Mask9
Mask10
Mask11
Mask12
Mask13
Mask14
Mask15
Mask16
Mask17
Mask18
Mask19
Mask20
Mask21
-
Mask DataEnd flag.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
9
Mask StartBitErr flag.
Mask DataBlockEnd flag.
Mask CmdActive flag.
Mask TxActive flag.
10
11
12
13
14
15
16
17
18
19
20
21
31:22
Mask RxActive flag.
Mask TxFifoHalfEmpty flag.
Mask RxFifoHalfFull flag.
Mask TxFifoFull flag.
Mask RxFifoFull flag.
Mask TxFifoEmpty flag.
Mask RxFifoEmpty flag.
Mask TxDataAvlbl flag.
Mask RxDataAvlbl flag.
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
6.14 FIFO Counter Register (MCIFifoCnt - 0xE008 C048)
The MCIFifoCnt register contains the remaining number of words to be written to or read
from the FIFO. The FIFO counter loads the value from the data length register (see
Enable bit is set in the data control register. If the data length is not word aligned (multiple
assignment of the MCIFifoCnt register.
Table 507: FIFO Counter register (MCIFifoCnt - address 0xE008 C048) bit description
Bit
Symbol
Description
Reset
Value
14:0
DataCount Remaining data
0x0000
31:15
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.15 Data FIFO Register (MCIFIFO - 0xE008 C080 to 0xE008 C0BC)
The receive and transmit FIFOs can be read or written as 32 bit wide registers. The FIFOs
contain 16 entries on 16 sequential addresses. This allows the microprocessor to use its
assignment of the MCIFIFO register.
Table 508: Data FIFO register (MCIFIFO - address 0xE008 C080 to 0xE008 C0BC) bit
description
Bit
Symbol
Description
Reset Value
31:0
Data
FIFO data.
0x0000 0000
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
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User manual
1. Basic configuration
The I2C0/1/2 interfaces are configured using the following registers:
Remark: On reset, all I2C interfaces are enabled (PCI2C0/1/2 = 1).
2. Clock: In PCLK_SEL0 select PCLK_I2C0; in PCLK_SEL1 select PCLK_I2C1/2 (see
3. Pins: Select I2C pins and their modes in PINSEL0 to PINSEL4 and PINMODE0 to
Remark: I2C0 pins SDA0 and SCL0 are open-drain outputs for I2C-bus compliance
2. Features
• Standard I2C compliant bus interfaces that may be configured as Master, Slave, or
Master/Slave.
• Arbitration between simultaneously transmitting masters without corruption of serial
data on the bus.
• Programmable clock to allow adjustment of I2C transfer rates.
• Bidirectional data transfer between masters and slaves.
• Serial clock synchronization allows devices with different bit rates to communicate via
one serial bus.
• Serial clock synchronization can be used as a handshake mechanism to suspend and
resume serial transfer.
• The I2C bus may be used for test and diagnostic purposes.
3. Applications
Interfaces to external I2C standard parts, such as serial RAMs, LCDs, tone generators,
etc.
4. Description
direction bit (R/W), two types of data transfers are possible on the I2C bus:
• Data transfer from a master transmitter to a slave receiver. The first byte transmitted
by the master is the slave address. Next follows a number of data bytes. The slave
returns an acknowledge bit after each received byte.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
• Data transfer from a slave transmitter to a master receiver. The first byte (the slave
address) is transmitted by the master. The slave then returns an acknowledge bit.
Next follows the data bytes transmitted by the slave to the master. The master returns
an acknowledge bit after all received bytes other than the last byte. At the end of the
last received byte, a “not acknowledge” is returned. The master device generates all
of the serial clock pulses and the START and STOP conditions. A transfer is ended
with a STOP condition or with a repeated START condition. Since a repeated START
condition is also the beginning of the next serial transfer, the I2C bus will not be
released.
Each of the three I2C interfaces on the LPC2400 is byte oriented, and has four operating
modes: master transmitter mode, master receiver mode, slave transmitter mode and
slave receiver mode.
The three I2C interfaces are identical except for the pin I/O characteristics. I2C0 complies
with entire I2C specification, supporting the ability to turn power off to the LPC2400
without causing a problem with other devices on the same I2C bus (see "The I2C-bus
specification" description under the heading "Fast-Mode", and notes for the table titled
"Characteristics of the SDA and SCL I/O stages for F/S-mode I2C-bus devices"). This is
sometimes a useful capability, but intrinsically limits alternate uses for the same pins if the
I2C interface is not used. Seldom is this capability needed on multiple I2C interfaces
within the same microcontroller. Therefore, I2C1 and I2C2 are implemented using
standard port pins, and do not support the ability to turn power off to the LPC2400 while
leaving the I2C bus functioning between other devices. This difference should be
considered during system design while assigning uses for the I2C interfaces.
pull-up
resistor
pull-up
resistor
SDA
SCL
I 2C bus
SCL
SDA
OTHER DEVICE WITH
I 2C INTERFACE
OTHER DEVICE WITH
I C INTERFACE
LPC2400
2
Fig 111. I2C bus configuration
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
5. Pin description
Table 509. I2C Pin Description
Pin
Type
Description
SDA0,1, 2
SCL0,1, 2
Input/Output
Input/Output
I2C Serial Data
I2C Serial Clock
6. I2C operating modes
In a given application, the I2C block may operate as a master, a slave, or both. In the slave
mode, the I2C hardware looks for its own slave address and the general call address. If
one of these addresses is detected, an interrupt is requested. If the processor wishes to
become the bus master, the hardware waits until the bus is free before the master mode is
entered so that a possible slave operation is not interrupted. If bus arbitration is lost in the
master mode, the I2C block switches to the slave mode immediately and can detect its
own slave address in the same serial transfer.
6.1 Master Transmitter mode
In this mode data is transmitted from master to slave. Before the master transmitter mode
I2EN must be set to 1 to enable the I2C function. If the AA bit is 0, the I2C interface will not
acknowledge any address when another device is master of the bus, so it can not enter
slave mode. The STA, STO and SI bits must be 0. The SI Bit is cleared by writing 1 to the
SIC bit in the I2CONCLR register.
Table 510. I2CnCONSET used to configure Master mode
Bit
7
-
6
5
4
3
2
1
-
0
-
Symbol
Value
I2EN
1
STA
0
STO
0
SI
0
AA
0
-
-
-
The first byte transmitted contains the slave address of the receiving device (7 bits) and
the data direction bit. In this mode the data direction bit (R/W) should be 0 which means
Write. The first byte transmitted contains the slave address and Write bit. Data is
transmitted 8 bits at a time. After each byte is transmitted, an acknowledge bit is received.
START and STOP conditions are output to indicate the beginning and the end of a serial
transfer.
The I2C interface will enter master transmitter mode when software sets the STA bit. The
I2C logic will send the START condition as soon as the bus is free. After the START
condition is transmitted, the SI bit is set, and the status code in the I2STAT register is
0x08. This status code is used to vector to a state service routine which will load the slave
address and Write bit to the I2DAT register, and then clear the SI bit. SI is cleared by
writing a 1 to the SIC bit in the I2CONCLR register. The STA bit should be cleared after
writing the slave address.
When the slave address and R/W bit have been transmitted and an acknowledgment bit
has been received, the SI bit is set again, and the possible status codes now are 0x18,
0x20, or 0x38 for the master mode, or 0x68, 0x78, or 0xB0 if the slave mode was enabled
(by setting AA to 1). The appropriate actions to be taken for each of these status codes
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
A/A
S
SLAVE ADDRESS
RW
A
DATA
A
DATA
P
“0” - write
“1” - read
data transferred
(n Bytes + Acknowledge)
A = Acknowledge (SDA low)
A = Not acknowledge (SDA high)
S = START condition
from Master to Slave
from Slave to Master
P = STOP condition
Fig 112. Format in the Master Transmitter mode
6.2 Master Receiver mode
In the master receiver mode, data is received from a slave transmitter. The transfer is
initiated in the same way as in the master transmitter mode. When the START condition
has been transmitted, the interrupt service routine must load the slave address and the
data direction bit to the I2C Data Register (I2DAT), and then clear the SI bit. In this case,
the data direction bit (R/W) should be 1 to indicate a read.
When the slave address and data direction bit have been transmitted and an
acknowledge bit has been received, the SI bit is set, and the Status Register will show the
status code. For master mode, the possible status codes are 0x40, 0x48, or 0x38. For
slave mode, the possible status codes are 0x68, 0x78, or 0xB0. For details, refer to
A
S
SLAVE ADDRESS
R
A
DATA
A
DATA
P
“0” - write
“1” - read
data transferred
(n Bytes + Acknowledge)
A = Acknowledge (SDA low)
A = Not acknowledge (SDA high)
S = START condition
from Master to Slave
from Slave to Master
P = STOP condition
Fig 113. Format of Master Receive mode
After a repeated START condition, I2C may switch to the master transmitter mode.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
S
SLA
R
A
DATA
A
DATA
A
RS
SLA
W
A
DATA
A
P
data transferred
(n Bytes + Acknowledge)
A = Acknowledge (SDA low)
A = Not acknowledge (SDA high)
S = START condition
From master to slave
From slave to master
P = STOP condition
SLA = Slave Address
Fig 114. A master receiver switch to master Transmitter after sending repeated START
6.3 Slave Receiver mode
In the slave receiver mode, data bytes are received from a master transmitter. To initialize
the slave receiver mode, user write the Slave Address Register (I2ADR) and write the I2C
Table 511. I2CnCONSET used to configure Slave mode
Bit
7
-
6
5
4
3
2
1
-
0
-
Symbol
Value
I2EN
1
STA
0
STO
0
SI
0
AA
1
-
-
-
I2EN must be set to 1 to enable the I2C function. AA bit must be set to 1 to acknowledge
its own slave address or the general call address. The STA, STO and SI bits are set to 0.
After I2ADR and I2CONSET are initialized, the I2C interface waits until it is addressed by
its own address or general address followed by the data direction bit. If the direction bit is
0 (W), it enters slave receiver mode. If the direction bit is 1 (R), it enters slave transmitter
mode. After the address and direction bit have been received, the SI bit is set and a valid
status codes and actions.
A/A
S
SLAVE ADDRESS
W
A
DATA
A
DATA
P/RS
“0” - write
“1” - read
data transferred
(n Bytes + Acknowledge)
A = Acknowledge (SDA low)
A = Not acknowledge (SDA high)
S = START condition
from Master to Slave
from Slave to Master
P = STOP condition
RS = Repeated START condition
Fig 115. Format of Slave Receiver mode
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6.4 Slave Transmitter mode
The first byte is received and handled as in the slave receiver mode. However, in this
mode, the direction bit will be 1, indicating a read operation. Serial data is transmitted via
SDA while the serial clock is input through SCL. START and STOP conditions are
recognized as the beginning and end of a serial transfer. In a given application, I2C may
operate as a master and as a slave. In the slave mode, the I2C hardware looks for its own
slave address and the general call address. If one of these addresses is detected, an
interrupt is requested. When the microcontrollers wishes to become the bus master, the
hardware waits until the bus is free before the master mode is entered so that a possible
slave action is not interrupted. If bus arbitration is lost in the master mode, the I2C
interface switches to the slave mode immediately and can detect its own slave address in
the same serial transfer.
A
S
SLAVE ADDRESS
R
A
DATA
A
DATA
P
“0” - write
“1” - read
data transferred
(n Bytes + Acknowledge)
A = Acknowledge (SDA low)
A = Not acknowledge (SDA high)
S = START condition
from Master to Slave
from Slave to Master
P = STOP condition
Fig 116. Format of Slave Transmitter mode
7. I2C implementation and operation
7.1 Input filters and output stages
Input signals are synchronized with the internal clock , and spikes shorter than three
clocks are filtered out.
The output for I2C is a special pad designed to conform to the I2C specification. The
outputs for I2C1 and I2C2 are standard port I/Os that support a subset of the full I2C
specification.
text describes the individual blocks.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
8
ADDRESS REGISTER
I2ADR
COMPARATOR
INPUT
FILTER
SDA
OUTPUT
STAGE
SHIFT REGISTER
ACK
I2DAT
8
BIT COUNTER/
ARBITRATION &
SYNC LOGIC
PCLK
INPUT
FILTER
TIMING &
CONTROL
LOGIC
SCL
interrupt
OUTPUT
STAGE
SERIAL CLOCK
GENERATOR
I2CONSET
I2CONCLR
I2SCLH
CONTROL REGISTER & SCL DUTY
CYCLE REGISTERS
I2SCLL
16
STATUS
DECODER
status
bus
STATUS REGISTER
I2STAT
8
Fig 117. I2C Bus serial interface block diagram
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
7.2 Address Register I2ADDR
This register may be loaded with the 7 bit slave address (7 most significant bits) to which
the I2C block will respond when programmed as a slave transmitter or receiver. The LSB
(GC) is used to enable general call address (0x00) recognition.
7.3 Comparator
The comparator compares the received 7 bit slave address with its own slave address (7
most significant bits in I2ADR). It also compares the first received 8 bit byte with the
general call address (0x00). If an equality is found, the appropriate status bits are set and
an interrupt is requested.
7.4 Shift register I2DAT
This 8 bit register contains a byte of serial data to be transmitted or a byte which has just
been received. Data in I2DAT is always shifted from right to left; the first bit to be
transmitted is the MSB (bit 7) and, after a byte has been received, the first bit of received
data is located at the MSB of I2DAT. While data is being shifted out, data on the bus is
simultaneously being shifted in; I2DAT always contains the last byte present on the bus.
Thus, in the event of lost arbitration, the transition from master transmitter to slave
receiver is made with the correct data in I2DAT.
7.5 Arbitration and synchronization logic
In the master transmitter mode, the arbitration logic checks that every transmitted logic 1
actually appears as a logic 1 on the I2C bus. If another device on the bus overrules a logic
1 and pulls the SDA line low, arbitration is lost, and the I2C block immediately changes
from master transmitter to slave receiver. The I2C block will continue to output clock
pulses (on SCL) until transmission of the current serial byte is complete.
Arbitration may also be lost in the master receiver mode. Loss of arbitration in this mode
can only occur while the I2C block is returning a “not acknowledge: (logic 1) to the bus.
Arbitration is lost when another device on the bus pulls this signal LOW. Since this can
occur only at the end of a serial byte, the I2C block generates no further clock pulses.
Figure 22–118 shows the arbitration procedure.
(1)
1
(1)
2
(2)
3
(3)
SDA line
SCL line
4
8
9
ACK
(1) A device transmits serial data.
(2) Another device overrules a logic 1 (dotted line), transmitted by this I2C master, by pulling the SDA
line low. Arbitration is lost, and this I2C enters Slave Receiver mode.
(3) This I2C is in Slave Receiver mode but still generates clock pulses until the current byte has been
transmitted. This I2C will not generate clock pulses for the next byte. Data on SDA originates from
the new master once it has won arbitration.
Fig 118. Arbitration procedure
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
The synchronization logic will synchronize the serial clock generator with the clock pulses
on the SCL line from another device. If two or more master devices generate clock pulses,
the “mark” duration is determined by the device that generates the shortest “marks,” and
the “space” duration is determined by the device that generates the longest “spaces”.
Figure 22–119 shows the synchronization procedure.
SDA line
(1)
(3)
(1)
SCL line
(2)
high
low
period
period
(1) Another device pulls the SCL line low before this I2C has timed a complete high time. The other
device effectively determines the (shorter) HIGH period.
(2) Another device continues to pull the SCL line low after this I2C has timed a complete low time and
released SCL. The I2C clock generator is forced to wait until SCL goes HIGH. The other device
effectively determines the (longer) LOW period.
(3) The SCL line is released , and the clock generator begins timing the HIGH time.
Fig 119. Serial clock synchronization
A slave may stretch the space duration to slow down the bus master. The space duration
may also be stretched for handshaking purposes. This can be done after each bit or after
a complete byte transfer. the I2C block will stretch the SCL space duration after a byte has
been transmitted or received and the acknowledge bit has been transferred. The serial
interrupt flag (SI) is set, and the stretching continues until the serial interrupt flag is
cleared.
7.6 Serial clock generator
This programmable clock pulse generator provides the SCL clock pulses when the I2C
block is in the master transmitter or master receiver mode. It is switched off when the I2C
block is in a slave mode. The I2C output clock frequency and duty cycle is programmable
via the I2C Clock Control Registers. See the description of the I2CSCLL and I2CSCLH
registers for details. The output clock pulses have a duty cycle as programmed unless the
bus is synchronizing with other SCL clock sources as described above.
7.7 Timing and control
The timing and control logic generates the timing and control signals for serial byte
handling. This logic block provides the shift pulses for I2DAT, enables the comparator,
generates and detects start and stop conditions, receives and transmits acknowledge bits,
controls the master and slave modes, contains interrupt request logic, and monitors the
I2C bus status.
7.8 Control register I2CONSET and I2CONCLR
The I2C control register contains bits used to control the following I2C block functions: start
and restart of a serial transfer, termination of a serial transfer, bit rate, address recognition,
and acknowledgment.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
The contents of the I2C control register may be read as I2CONSET. Writing to I2CONSET
will set bits in the I2C control register that correspond to ones in the value written.
Conversely, writing to I2CONCLR will clear bits in the I2C control register that correspond
to ones in the value written.
7.9 Status decoder and status register
The status decoder takes all of the internal status bits and compresses them into a 5 bit
code. This code is unique for each I2C bus status. The 5 bit code may be used to generate
vector addresses for fast processing of the various service routines. Each service routine
processes a particular bus status. There are 26 possible bus states if all four modes of the
I2C block are used. The 5 bit status code is latched into the five most significant bits of the
status register when the serial interrupt flag is set (by hardware) and remains stable until
the interrupt flag is cleared by software. The three least significant bits of the status
register are always zero. If the status code is used as a vector to service routines, then the
routines are displaced by eight address locations. Eight bytes of code is sufficient for most
of the service routines (see the software example in this section).
8. Register description
Table 512. Summary of I2C registers
Generic
Name
Description
Access Reset I2Cn Register
I2CONSET I2C Control Set Register. When a one is written to a R/W
bit of this register, the corresponding bit in the I2C
0x00
I2C0CONSET - 0xE001 C000
I2C1CONSET - 0xE005 C000
I2C2CONSET - 0xE008 0000
control register is set. Writing a zero has no effect on
the corresponding bit in the I2C control register.
I2STAT
I2DAT
I2C Status Register. During I2C operation, this
register provides detailed status codes that allow
software to determine the next action needed.
RO
0xF8
0x00
I2C0STAT - 0xE001 C004
I2C1STAT - 0xE005 C004
I2C2STAT - 0xE008 0004
I2C Data Register. During master or slave transmit
mode, data to be transmitted is written to this register.
During master or slave receive mode, data that has
been received may be read from this register.
R/W
I2C0DAT - 0xE001 C008
I2C1DAT - 0xE005 C008
I2C2DAT - 0xE008 0008
I2ADR
I2C Slave Address Register. Contains the 7 bit slave R/W
address for operation of the I2C interface in slave
mode, and is not used in master mode. The least
significant bit determines whether a slave responds to
the general call address.
0x00
I2C0ADR - 0xE001 C00C
I2C1ADR - 0xE005 C00C
I2C2ADR - 0xE008 000C
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 512. Summary of I2C registers
Generic
Name
Description
Access Reset I2Cn Register
value[1] Name & Address
I2SCLH
SCH Duty Cycle Register High Half Word.
Determines the high time of the I2C clock.
R/W
0x04
I2C0SCLH - 0xE001 C010
I2C1SCLH - 0xE005 C010
I2C2SCLH - 0xE008 0010
I2SCLL
SCL Duty Cycle Register Low Half Word.
Determines the low time of the I2C clock. I2nSCLL
and I2nSCLH together determine the clock frequency
generated by an I2C master and certain times used in
slave mode.
R/W
0x04
I2C0SCLL - 0xE001 C014
I2C1SCLL - 0xE005 C014
I2C2SCLL - 0xE008 0014
I2CONCLR I2C Control Clear Register. When a one is written to WO
a bit of this register, the corresponding bit in the I2C
NA
I2C0CONCLR - 0xE001 C018
I2C1CONCLR - 0xE005 C018
I2C2CONCLR - 0xE008 0018
control register is cleared. Writing a zero has no effect
on the corresponding bit in the I2C control register.
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
8.1 I2C Control Set Register (I2C[0/1/2]CONSET: 0xE001 C000,
0xE005 C000, 0xE008 0000)
The I2CONSET registers control setting of bits in the I2CON register that controls
operation of the I2C interface. Writing a one to a bit of this register causes the
corresponding bit in the I2C control register to be set. Writing a zero has no effect.
Table 513. I2C Control Set Register (I2C[0/1/2]CONSET - addresses: 0xE001 C000,
0xE005 C000, 0xE008 0000) bit description
Bit Symbol
Description
Reset
Value
1:0 -
Reserved. User software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
2
3
4
5
6
7
AA
SI
Assert acknowledge flag. See the text below.
I2C interrupt flag.
0
0
0
0
STO
STA
I2EN
-
STOP flag. See the text below.
START flag. See the text below.
I2C interface enable. See the text below.
Reserved. User software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
I2EN I2C Interface Enable. When I2EN is 1, the I2C interface is enabled. I2EN can be
cleared by writing 1 to the I2ENC bit in the I2CONCLR register. When I2EN is 0, the I2C
interface is disabled.
When I2EN is “0”, the SDA and SCL input signals are ignored, the I2C block is in the “not
addressed” slave state, and the STO bit is forced to “0”.
I2EN should not be used to temporarily release the I2C bus since, when I2EN is reset, the
I2C bus status is lost. The AA flag should be used instead.
STA is the START flag. Setting this bit causes the I2C interface to enter master mode and
transmit a START condition or transmit a repeated START condition if it is already in
master mode.
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When STA is 1 and the I2C interface is not already in master mode, it enters master mode,
checks the bus and generates a START condition if the bus is free. If the bus is not free, it
waits for a STOP condition (which will free the bus) and generates a START condition
after a delay of a half clock period of the internal clock generator. If the I2C interface is
already in master mode and data has been transmitted or received, it transmits a repeated
START condition. STA may be set at any time, including when the I2C interface is in an
addressed slave mode.
STA can be cleared by writing 1 to the STAC bit in the I2CONCLR register. When STA is
0, no START condition or repeated START condition will be generated.
If STA and STO are both set, then a STOP condition is transmitted on the I2C bus if it the
interface is in master mode, and transmits a START condition thereafter. If the I2C
interface is in slave mode, an internal STOP condition is generated, but is not transmitted
on the bus.
STO is the STOP flag. Setting this bit causes the I2C interface to transmit a STOP
condition in master mode, or recover from an error condition in slave mode. When STO is
1 in master mode, a STOP condition is transmitted on the I2C bus. When the bus detects
the STOP condition, STO is cleared automatically.
In slave mode, setting this bit can recover from an error condition. In this case, no STOP
condition is transmitted to the bus. The hardware behaves as if a STOP condition has
been received and it switches to “not addressed” slave receiver mode. The STO flag is
cleared by hardware automatically.
SI is the I2C Interrupt Flag. This bit is set when the I2C state changes. However, entering
state F8 does not set SI since there is nothing for an interrupt service routine to do in that
case.
While SI is set, the low period of the serial clock on the SCL line is stretched, and the
serial transfer is suspended. When SCL is high, it is unaffected by the state of the SI flag.
SI must be reset by software, by writing a 1 to the SIC bit in I2CONCLR register.
AA is the Assert Acknowledge Flag. When set to 1, an acknowledge (low level to SDA)
will be returned during the acknowledge clock pulse on the SCL line on the following
situations:
1. The address in the Slave Address Register has been received.
2. The general call address has been received while the general call bit (GC) in I2ADR is
set.
3. A data byte has been received while the I2C is in the master receiver mode.
4. A data byte has been received while the I2C is in the addressed slave receiver mode.
The AA bit can be cleared by writing 1 to the AAC bit in the I2CONCLR register. When AA
is 0, a not acknowledge (high level to SDA) will be returned during the acknowledge clock
pulse on the SCL line on the following situations:
1. A data byte has been received while the I2C is in the master receiver mode.
2. A data byte has been received while the I2C is in the addressed slave receiver mode.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
8.2 I2C Control Clear Register (I2C[0/1/2]CONCLR: 0xE001 C018,
0xE005 C018, 0xE008 0018)
The I2CONCLR registers control clearing of bits in the I2CON register that controls
operation of the I2C interface. Writing a one to a bit of this register causes the
corresponding bit in the I2C control register to be cleared. Writing a zero has no effect.
Table 514. I2C Control Set Register (I2C[0/1/2]CONCLR - addresses 0xE001 C018,
0xE005 C018, 0xE008 0018) bit description
Bit Symbol
Description
Reset
Value
1:0 -
Reserved. User software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
2
3
4
AAC
SIC
-
Assert acknowledge Clear bit.
I2C interrupt Clear bit.
0
Reserved. User software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
5
6
7
STAC
I2ENC
-
START flag Clear bit.
I2C interface Disable bit.
0
0
Reserved. User software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
AAC is the Assert Acknowledge Clear bit. Writing a 1 to this bit clears the AA bit in the
I2CONSET register. Writing 0 has no effect.
SIC is the I2C Interrupt Clear bit. Writing a 1 to this bit clears the SI bit in the I2CONSET
register. Writing 0 has no effect.
STAC is the Start flag Clear bit. Writing a 1 to this bit clears the STA bit in the I2CONSET
register. Writing 0 has no effect.
I2ENC is the I2C Interface Disable bit. Writing a 1 to this bit clears the I2EN bit in the
I2CONSET register. Writing 0 has no effect.
8.3 I2C Status Register (I2C[0/1/2]STAT - 0xE001 C004, 0xE005 C004,
0xE008 0004)
Each I2C Status register reflects the condition of the corresponding I2C interface. The I2C
Status register is Read-Only.
Table 515. I2C Status Register (I2C[0/1/2]STAT - addresses 0xE001 C004, 0xE005 C004,
0xE008 0004) bit description
Bit Symbol Description
Reset Value
2:0 -
These bits are unused and are always 0.
0
7:3 Status
These bits give the actual status information about the I2C interface. 0x1F
The three least significant bits are always 0. Taken as a byte, the status register contents
represent a status code. There are 26 possible status codes. When the status code is
0xF8, there is no relevant information available and the SI bit is not set. All other 25 status
codes correspond to defined I2C states. When any of these states entered, the SI bit will
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
8.4 I2C Data Register (I2C[0/1/2]DAT - 0xE001 C008, 0xE005 C008,
0xE008 0008)
This register contains the data to be transmitted or the data just received. The CPU can
read and write to this register only while it is not in the process of shifting a byte, when the
SI bit is set. Data in I2DAT remains stable as long as the SI bit is set. Data in I2DAT is
always shifted from right to left: the first bit to be transmitted is the MSB (bit 7), and after a
byte has been received, the first bit of received data is located at the MSB of I2DAT.
Table 516. I2C Data Register ( I2C[0/1/2]DAT - addresses 0xE001 C008, 0xE005 C008,
0xE008 0008) bit description
Bit Symbol
Description
Reset Value
7:0 Data
This register holds data values that have been received, or are to
be transmitted.
0
8.5 I2C Slave Address Register (I2C[0/1/2]ADR - 0xE001 C00C,
0xE005 C00C, 0xE008 000C)
These registers are readable and writable, and is only used when an I2C interface is set to
slave mode. In master mode, this register has no effect. The LSB of I2ADR is the general
call bit. When this bit is set, the general call address (0x00) is recognized.
Table 517. I2C Slave Address register (I2C[0/1/2]ADR - addresses 0xE001 C00C,
0xE005 C00C, 0xE008 000C) bit description
Bit Symbol
GC
7:1 Address
Description
Reset Value
0
General Call enable bit.
The I2C device address for slave mode.
0
0x00
8.6 I2C SCL High Duty Cycle Register (I2C[0/1/2]SCLH - 0xE001 C010,
0xE005 C010, 0xE008 0010)
Table 518. I2C SCL High Duty Cycle register (I2C[0/1/2]SCLH - addresses 0xE001 C010,
0xE005 C010, 0xE008 0010) bit description
Bit
Symbol Description
SCLH Count for SCL HIGH time period selection.
Reset Value
15:0
0x0004
8.7 I2C SCL Low Duty Cycle Register (I2C[0/1/2]SCLL - 0xE001 C014,
0xE005 C014, 0xE008 0014)
Table 519. I2C SCL Low Duty Cycle register (I2C[0/1/2]SCLL - addresses 0xE001 C014,
0xE005 C014, 0xE008 0014) bit description
Bit
Symbol Description
SCLL Count for SCL LOW time period selection.
Reset Value
15:0
0x0004
8.8 Selecting the appropriate I2C data rate and duty cycle
Software must set values for the registers I2SCLH and I2SCLL to select the appropriate
data rate and duty cycle. I2SCLH defines the number of PCLK cycles for the SCL high
time, I2SCLL defines the number of PCLK cycles for the SCL low time. The frequency is
determined by the following formula (fPCLK being the frequency of PCLK):
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
(12)
fPCLK
2
I Cbitfrequency
=
--------------------------------------------------------
I2CSCLH + I2CSCLL
The values for I2SCLL and I2SCLH should not necessarily be the same. Software can set
different duty cycles on SCL by setting these two registers. For example, the I2C bus
specification defines the SCL low time and high time at different values for a 400 kHz I2C
rate. The value of the register must ensure that the data rate is in the I2C data rate range
of 0 through 400 kHz. Each register value must be greater than or equal to 4.
I2SCLL and I2SCLH values.
Table 520. Example I2C Clock Rates
I2SCLL +
I2SCLH
I2C Bit Frequency (kHz) at PCLK (MHz)
1
5
10
16
20
40
60
8
125
100
40
10
25
200
100
50
400
200
100
62.5
50
50
20
320
160
100
80
400
200
125
100
50
100
160
200
400
800
10
400
250
200
100
50
6.25
5
31.25
25
375
300
150
75
2.5
1.25
12.5
6.25
25
40
12.5
20
25
9. Details of I2C operating modes
The four operating modes are:
• Master Transmitter
• Master Receiver
• Slave Receiver
• Slave Transmitter
lists abbreviations used in these figures when describing the I2C operating modes.
Table 521. Abbreviations used to describe an I2C operation
Abbreviation
Explanation
S
Start Condition
SLA
R
7 bit slave address
Read bit (high level at SDA)
Write bit (low level at SDA)
Acknowledge bit (low level at SDA)
W
A
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 521. Abbreviations used to describe an I2C operation
Abbreviation Explanation
A
Not acknowledge bit (high level at SDA)
8 bit data byte
Data
P
Stop condition
numbers in the circles show the status code held in the I2STAT register. At these points, a
service routine must be executed to continue or complete the serial transfer. These
service routines are not critical since the serial transfer is suspended until the serial
interrupt flag is cleared by software.
When a serial interrupt routine is entered, the status code in I2STAT is used to branch to
the appropriate service routine. For each status code, the required software action and
9.1 Master Transmitter mode
In the master transmitter mode, a number of data bytes are transmitted to a slave receiver
initialized as follows:
Table 522. I2CONSET used to initialize Master Transmitter mode
Bit
7
-
6
5
4
3
2
1
-
0
-
Symbol
Value
I2EN
1
STA
0
STO
0
SI
0
AA
x
-
-
-
The I2C rate must also be configured in the I2SCLL and I2SCLH registers. I2EN must be
set to logic 1 to enable the I2C block. If the AA bit is reset, the I2C block will not
acknowledge its own slave address or the general call address in the event of another
device becoming master of the bus. In other words, if AA is reset, the I2C interface cannot
enter a slave mode. STA, STO, and SI must be reset.
The master transmitter mode may now be entered by setting the STA bit. The I2C logic will
now test the I2C bus and generate a start condition as soon as the bus becomes free.
When a START condition is transmitted, the serial interrupt flag (SI) is set, and the status
code in the status register (I2STAT) will be 0x08. This status code is used by the interrupt
service routine to enter the appropriate state service routine that loads I2DAT with the
slave address and the data direction bit (SLA+W). The SI bit in I2CON must then be reset
before the serial transfer can continue.
When the slave address and the direction bit have been transmitted and an
acknowledgment bit has been received, the serial interrupt flag (SI) is set again, and a
number of status codes in I2STAT are possible. There are 0x18, 0x20, or 0x38 for the
master mode and also 0x68, 0x78, or 0xB0 if the slave mode was enabled (AA = logic 1).
The appropriate action to be taken for each of these status codes is detailed in
the master receiver mode by loading I2DAT with SLA+R).
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
9.2 Master Receiver mode
In the master receiver mode, a number of data bytes are received from a slave transmitter
the start condition has been transmitted, the interrupt service routine must load I2DAT with
the 7 bit slave address and the data direction bit (SLA+R). The SI bit in I2CON must then
be cleared before the serial transfer can continue.
When the slave address and the data direction bit have been transmitted and an
acknowledgment bit has been received, the serial interrupt flag (SI) is set again, and a
number of status codes in I2STAT are possible. These are 0x40, 0x48, or 0x38 for the
master mode and also 0x68, 0x78, or 0xB0 if the slave mode was enabled (AA = 1). The
After a repeated start condition (state 0x10), the I2C block may switch to the master
transmitter mode by loading I2DAT with SLA+W.
9.3 Slave Receiver mode
In the slave receiver mode, a number of data bytes are received from a master transmitter
loaded as follows:
Table 523. I2C0ADR and I2C1ADR usage in Slave Receiver mode
Bit
7
6
5
4
3
2
1
0
Symbol
own slave 7 bit address
GC
The upper 7 bits are the address to which the I2C block will respond when addressed by a
master. If the LSB (GC) is set, the I2C block will respond to the general call address
(0x00); otherwise it ignores the general call address.
Table 524. I2C0CONSET and I2C1CONSET used to initialize Slave Receiver mode
Bit
7
-
6
5
4
3
2
1
-
0
-
Symbol
Value
I2EN
1
STA
0
STO
0
SI
0
AA
1
-
-
-
The I2C bus rate settings do not affect the I2C block in the slave mode. I2EN must be set
to logic 1 to enable the I2C block. The AA bit must be set to enable the I2C block to
acknowledge its own slave address or the general call address. STA, STO, and SI must
be reset.
When I2ADR and I2CON have been initialized, the I2C block waits until it is addressed by
its own slave address followed by the data direction bit which must be “0” (W) for the I2C
block to operate in the slave receiver mode. After its own slave address and the W bit
have been received, the serial interrupt flag (SI) is set and a valid status code can be read
from I2STAT. This status code is used to vector to a state service routine. The appropriate
action to be taken for each of these status codes is detailed in Table 104. The slave
receiver mode may also be entered if arbitration is lost while the I2C block is in the master
mode (see status 0x68 and 0x78).
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If the AA bit is reset during a transfer, the I2C block will return a not acknowledge (logic 1)
to SDA after the next received data byte. While AA is reset, the I2C block does not
respond to its own slave address or a general call address. However, the I2C bus is still
monitored and address recognition may be resumed at any time by setting AA. This
means that the AA bit may be used to temporarily isolate the I2C block from the I2C bus.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
MT
successful
transmission
S
SLA
W
A
DATA
A
P
to a Slave
Receiver
18H
28H
08H
next transfer
started with a
Repeated Start
condition
S
SLA
W
R
10H
Not
Acknowledge
received after
the Slave
address
A
P
20H
to Master
receive
mode,
entry
Not
Acknowledge
received after a
Data byte
A
P
= MR
30H
arbitration lost
in Slave
address or
Data byte
other Master
continues
other Master
continues
A OR A
38H
A OR A
38H
arbitration lost
and
addressed as
Slave
other Master
continues
A
to corresponding
states in Slave mode
68H 78H B0H
from Master to Slave
from Slave to Master
any number of data bytes and their associated Acknowledge bits
DATA
n
this number (contained in I2STA) corresponds to a defined state of the
I2C bus
Fig 120. Format and States in the Master Transmitter mode
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MR
successful
transmission to
a Slave
A
S
SLA
R
A
DATA
A
DATA
P
transmitter
08H
40H
50H
58H
next transfer
started with a
Repeated Start
condition
S
SLA
R
10H
Not Acknowledge
received after the
Slave address
A
P
W
48H
to Master
transmit
mode, entry
= MT
arbitration lost in
Slave address or
Acknowledge bit
other Master
continues
other Master
continues
A OR A
38H
A
38H
arbitration lost
and addressed
as Slave
other Master
continues
A
to corresponding
states in Slave
mode
68H 78H B0H
from Master to Slave
from Slave to Master
any number of data bytes and their associated
Acknowledge bits
DATA
n
A
this number (contained in I2STA) corresponds to a defined state of
the I2C bus
Fig 121. Format and States in the Master Receiver mode
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reception of the own
Slave address and one
or more Data bytes all
are acknowledged
S
SLA
R
A
DATA
A
DATA
A
P OR S
A0H
60H
80H
80H
last data byte
received is Not
acknowledged
A
P OR S
88H
arbitration lost as
Master and addressed
as Slave
A
68H
reception of the
General Call address
and one or more Data
bytes
A
GENERAL CALL
A
DATA
A
DATA
P OR S
A0H
70h
90h
90h
last data byte is Not
acknowledged
A
P OR S
98h
arbitration lost as
Master and addressed
as Slave by General
Call
A
78h
from Master to Slave
from Slave to Master
DATA
n
A
any number of data bytes and their associated Acknowledge bits
this number (contained in I2STA) corresponds to a defined state of the2IC
bus
Fig 122. Format and States in the Slave Receiver mode
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
reception of the own
Slave address and
one or more Data
bytes all are
A
S
SLA
R
A
DATA
A
DATA
P OR S
acknowledged
A8H
B8H
C0H
arbitration lost as
Master and
A
addressed as Slave
B0H
last data byte
transmitted. Switched
to Not Addressed
Slave (AA bit in
A
ALL ONES P OR S
I2CON = “0”)
C8H
from Master to Slave
from Slave to Master
any number of data bytes and their associated
Acknowledge bits
DATA
n
A
this number (contained in I2STA) corresponds to a defined state of
the I2C bus
Fig 123. Format and States in the Slave Transmitter mode
9.4 Slave Transmitter mode
In the slave transmitter mode, a number of data bytes are transmitted to a master receiver
I2ADR and I2CON have been initialized, the I2C block waits until it is addressed by its own
slave address followed by the data direction bit which must be “1” (R) for the I2C block to
operate in the slave transmitter mode. After its own slave address and the R bit have been
received, the serial interrupt flag (SI) is set and a valid status code can be read from
I2STAT. This status code is used to vector to a state service routine, and the appropriate
transmitter mode may also be entered if arbitration is lost while the I2C block is in the
master mode (see state 0xB0).
If the AA bit is reset during a transfer, the I2C block will transmit the last byte of the transfer
and enter state 0xC0 or 0xC8. The I2C block is switched to the not addressed slave mode
and will ignore the master receiver if it continues the transfer. Thus the master receiver
receives all 1s as serial data. While AA is reset, the I2C block does not respond to its own
slave address or a general call address. However, the I2C bus is still monitored, and
address recognition may be resumed at any time by setting AA. This means that the AA
bit may be used to temporarily isolate the I2C block from the I2C bus.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 525. Master Transmitter mode
Status
Status of the I2C bus Application software response
Next action taken by I2C hardware
Code
(I2CSTAT)
and hardware
To/From I2DAT
To I2CON
STA STO SI
AA
0x08
0x10
A START condition
has been transmitted.
Load SLA+W
Clear STA
X
0
0
X
SLA+W will be transmitted; ACK bit will
be received.
A repeated START
condition has been
transmitted.
Load SLA+W or
Load SLA+R
Clear STA
X
X
0
0
0
0
X
X
As above.
SLA+W will be transmitted; the I2C block
will be switched to MST/REC mode.
0x18
0x20
0x28
0x30
0x38
SLA+W has been
transmitted; ACK has
been received.
Load data byte or
0
1
0
1
0
0
1
1
0
0
0
0
X
X
X
X
Data byte will be transmitted; ACK bit will
be received.
No I2DAT action
or
Repeated START will be transmitted.
No I2DAT action
or
STOP condition will be transmitted; STO
flag will be reset.
No I2DAT action
STOP condition followed by a START
condition will be transmitted; STO flag will
be reset.
SLA+W has been
transmitted; NOT ACK
has been received.
Load data byte or
0
1
0
1
0
0
1
1
0
0
0
0
X
X
X
X
Data byte will be transmitted; ACK bit will
be received.
No I2DAT action
or
Repeated START will be transmitted.
No I2DAT action
or
STOP condition will be transmitted; STO
flag will be reset.
No I2DAT action
STOP condition followed by a START
condition will be transmitted; STO flag will
be reset.
Data byte in I2DAT
has been transmitted;
ACK has been
Load data byte or
0
1
0
1
0
0
1
1
0
0
0
0
X
X
X
X
Data byte will be transmitted; ACK bit will
be received.
No I2DAT action
or
Repeated START will be transmitted.
received.
No I2DAT action
or
STOP condition will be transmitted; STO
flag will be reset.
No I2DAT action
STOP condition followed by a START
condition will be transmitted; STO flag will
be reset.
Data byte in I2DAT
has been transmitted;
NOT ACK has been
received.
Load data byte or
0
1
0
1
0
0
1
1
0
0
0
0
X
X
X
X
Data byte will be transmitted; ACK bit will
be received.
No I2DAT action
or
Repeated START will be transmitted.
No I2DAT action
or
STOP condition will be transmitted; STO
flag will be reset.
No I2DAT action
STOP condition followed by a START
condition will be transmitted; STO flag will
be reset.
I2C bus will be released; not addressed
slave will be entered.
Arbitration lost in
SLA+R/W or Data
bytes.
No I2DAT action
or
0
1
0
0
0
0
X
X
No I2DAT action
A START condition will be transmitted
when the bus becomes free.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 526. Master Receiver mode
Status
Status of the I2C bus Application software response
Next action taken by I2C hardware
Code
(I2CSTAT)
and hardware
To/From I2DAT
To I2CON
STA STO SI
AA
0x08
0x10
A START condition
has been transmitted.
Load SLA+R
X
0
0
X
SLA+R will be transmitted; ACK bit will be
received.
A repeated START
condition has been
transmitted.
Load SLA+R or
Load SLA+W
X
X
0
0
0
0
X
X
As above.
SLA+W will be transmitted; the I2C block
will be switched to MST/TRX mode.
0x38
0x40
0x48
Arbitration lost in NOT No I2DAT action
0
1
0
0
1
0
1
0
0
0
0
0
1
1
0
0
0
0
0
0
0
X
X
0
I2C bus will be released; the I2C block will
enter a slave mode.
ACK bit.
or
No I2DAT action
A START condition will be transmitted
when the bus becomes free.
SLA+R has been
No I2DAT action
Data byte will be received; NOT ACK bit
will be returned.
transmitted; ACK has or
been received.
No I2DAT action
1
Data byte will be received; ACK bit will be
returned.
SLA+R has been
No I2DAT action
X
X
X
Repeated START condition will be
transmitted.
transmitted; NOT ACK or
has been received.
No I2DAT action
or
STOP condition will be transmitted; STO
flag will be reset.
No I2DAT action
STOP condition followed by a START
condition will be transmitted; STO flag will
be reset.
0x50
0x58
Data byte has been
received; ACK has
been returned.
Read data byte or
Read data byte
0
0
1
0
1
0
0
0
1
1
0
0
0
0
0
0
Data byte will be received; NOT ACK bit
will be returned.
1
Data byte will be received; ACK bit will be
returned.
Data byte has been
received; NOT ACK
has been returned.
Read data byte or
Read data byte or
Read data byte
X
X
X
Repeated START condition will be
transmitted.
STOP condition will be transmitted; STO
flag will be reset.
STOP condition followed by a START
condition will be transmitted; STO flag will
be reset.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 527. Slave Receiver Mode
Status
Status of the I2C bus Application software response
Next action taken by I2C hardware
Code
(I2CSTAT)
and hardware
To/From I2DAT
To I2CON
STA STO SI
AA
0x60
0x68
Own SLA+W has
been received; ACK
has been returned.
No I2DAT action
or
X
X
X
X
0
0
0
0
0
0
0
0
0
1
0
1
Data byte will be received and NOT ACK
will be returned.
No I2DAT action
Data byte will be received and ACK will
be returned.
Arbitration lost in
SLA+R/W as master; or
Own SLA+W has
been received, ACK
returned.
No I2DAT action
Data byte will be received and NOT ACK
will be returned.
No I2DAT action
Data byte will be received and ACK will
be returned.
0x70
0x78
General call address No I2DAT action
X
X
X
X
0
0
0
0
0
0
0
0
0
1
0
1
Data byte will be received and NOT ACK
will be returned.
(0x00) has been
received; ACK has
been returned.
or
No I2DAT action
Data byte will be received and ACK will
be returned.
Arbitration lost in
No I2DAT action
Data byte will be received and NOT ACK
will be returned.
SLA+R/W as master; or
General call address
No I2DAT action
Data byte will be received and ACK will
be returned.
has been received,
ACK has been
returned.
0x80
0x88
Previously addressed Read data byte or
with own SLV
X
X
0
0
0
0
0
1
Data byte will be received and NOT ACK
will be returned.
address; DATA has
been received; ACK
has been returned.
Read data byte
Data byte will be received and ACK will
be returned.
Previously addressed Read data byte or
with own SLA; DATA
byte has been
0
0
0
0
0
0
0
1
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address.
received; NOT ACK
has been returned.
Read data byte or
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1.
Read data byte or
1
1
0
0
0
0
0
1
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address. A START condition will be
transmitted when the bus becomes free.
Read data byte
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1. A START condition
will be transmitted when the bus becomes
free.
0x90
Previously addressed Read data byte or
with General Call;
X
X
0
0
0
0
0
1
Data byte will be received and NOT ACK
will be returned.
DATA byte has been
Read data byte
Data byte will be received and ACK will
be returned.
received; ACK has
been returned.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 527. Slave Receiver Mode
Status
Status of the I2C bus Application software response
Next action taken by I2C hardware
Code
(I2CSTAT)
and hardware
To/From I2DAT
To I2CON
STA STO SI
AA
0x98
Previously addressed Read data byte or
with General Call;
DATA byte has been
0
0
0
0
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address.
received; NOT ACK
has been returned.
Read data byte or
0
0
0
1
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1.
Read data byte or
1
1
0
0
0
0
0
1
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address. A START condition will be
transmitted when the bus becomes free.
Read data byte
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1. A START condition
will be transmitted when the bus becomes
free.
0xA0
A STOP condition or No STDAT action
0
0
0
0
0
0
0
1
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address.
repeated START
condition has been
received while still
addressed as
SLV/REC or
or
No STDAT action
or
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
SLV/TRX.
I2ADR[0] = logic 1.
No STDAT action
or
1
1
0
0
0
0
0
1
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address. A START condition will be
transmitted when the bus becomes free.
No STDAT action
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1. A START condition
will be transmitted when the bus becomes
free.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 528. Tad_105: Slave Transmitter mode
Status
Status of the I2C bus Application software response
Next action taken by I2C hardware
Code
(I2CSTAT)
and hardware
To/From I2DAT
To I2CON
STA STO SI
AA
0xA8
0xB0
Own SLA+R has been Load data byte or
received; ACK has
X
X
X
X
0
0
0
0
0
0
0
0
0
1
0
1
Last data byte will be transmitted and
ACK bit will be received.
been returned.
Load data byte
Data byte will be transmitted; ACK will be
received.
Arbitration lost in
Load data byte or
Load data byte
Last data byte will be transmitted and
ACK bit will be received.
SLA+R/W as master;
Own SLA+R has been
received, ACK has
been returned.
Data byte will be transmitted; ACK bit will
be received.
0xB8
0xC0
Data byte in I2DAT
has been transmitted;
ACK has been
Load data byte or
Load data byte
No I2DAT action
X
X
0
0
0
0
0
0
0
0
1
0
Last data byte will be transmitted and
ACK bit will be received.
Data byte will be transmitted; ACK bit will
be received.
received.
Data byte in I2DAT
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address.
has been transmitted; or
NOT ACK has been
received.
No I2DAT action
or
0
1
1
0
0
0
0
0
0
1
0
1
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1.
No I2DAT action
or
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address. A START condition will be
transmitted when the bus becomes free.
No I2DAT action
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1. A START condition
will be transmitted when the bus becomes
free.
0xC8
Last data byte in
I2DAT has been
transmitted (AA = 0);
ACK has been
received.
No I2DAT action
or
0
0
0
0
0
0
0
1
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address.
No I2DAT action
or
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR[0] = logic 1.
No I2DAT action
or
1
1
0
0
0
0
0
1
Switched to not addressed SLV mode; no
recognition of own SLA or General call
address. A START condition will be
transmitted when the bus becomes free.
No I2DAT action
Switched to not addressed SLV mode;
Own SLA will be recognized; General call
address will be recognized if
I2ADR.0 = logic 1. A START condition will
be transmitted when the bus becomes
free.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
9.5 Miscellaneous states
There are two I2STAT codes that do not correspond to a defined I2C hardware state (see
22.9.5.1 I2STAT = 0xF8
This status code indicates that no relevant information is available because the serial
interrupt flag, SI, is not yet set. This occurs between other states and when the I2C block
is not involved in a serial transfer.
22.9.5.2 I2STAT = 0x00
This status code indicates that a bus error has occurred during an I2C serial transfer. A
bus error is caused when a START or STOP condition occurs at an illegal position in the
format frame. Examples of such illegal positions are during the serial transfer of an
address byte, a data byte, or an acknowledge bit. A bus error may also be caused when
external interference disturbs the internal I2C block signals. When a bus error occurs, SI is
set. To recover from a bus error, the STO flag must be set and SI must be cleared. This
causes the I2C block to enter the “not addressed” slave mode (a defined state) and to
clear the STO flag (no other bits in I2CON are affected). The SDA and SCL lines are
released (a STOP condition is not transmitted).
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
Table 529. Miscellaneous states
Status
Status of the I2C bus Application software response
Next action taken by I2C hardware
Code
(I2CSTAT)
and hardware
To/From I2DAT
To I2CON
STA STO SI
AA
0xF8
0x00
No relevant state
information available;
SI = 0.
No I2DAT action
No I2CON action
Wait or proceed current transfer.
Bus error during MST No I2DAT action
or selected slave
modes, due to an
0
1
0
X
Only the internal hardware is affected in
the MST or addressed SLV modes. In all
cases, the bus is released and the I2C
block is switched to the not addressed
SLV mode. STO is reset.
illegal START or
STOP condition. State
0x00 can also occur
when interference
causes the I2C block
to enter an undefined
state.
9.6 Some special cases
The I2C hardware has facilities to handle the following special cases that may occur
during a serial transfer:
9.7 Simultaneous repeated START conditions from two masters
A repeated START condition may be generated in the master transmitter or master
receiver modes. A special case occurs if another master simultaneously generates a
either master since they were both transmitting the same data.
If the I2C hardware detects a repeated START condition on the I2C bus before generating
a repeated START condition itself, it will release the bus, and no interrupt request is
generated. If another master frees the bus by generating a STOP condition, the I2C block
will transmit a normal START condition (state 0x08), and a retry of the total serial data
transfer can commence.
9.8 Data transfer after loss of arbitration
Arbitration may be lost in the master transmitter and master receiver modes (see
If the STA flag in I2CON is set by the routines which service these states, then, if the bus
is free again, a START condition (state 0x08) is transmitted without intervention by the
CPU, and a retry of the total serial transfer can commence.
9.9 Forced access to the I2C bus
In some applications, it may be possible for an uncontrolled source to cause a bus
hang-up. In such situations, the problem may be caused by interference, temporary
interruption of the bus or a temporary short-circuit between SDA and SCL.
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If an uncontrolled source generates a superfluous START or masks a STOP condition,
then the I2C bus stays busy indefinitely. If the STA flag is set and bus access is not
obtained within a reasonable amount of time, then a forced access to the I2C bus is
possible. This is achieved by setting the STO flag while the STA flag is still set. No STOP
condition is transmitted. The I2C hardware behaves as if a STOP condition was received
and is able to transmit a START condition. The STO flag is cleared by hardware (see
Figure 34).
9.10 I2C Bus obstructed by a Low level on SCL or SDA
An I2C bus hang-up occurs if SDA or SCL is pulled LOW by an uncontrolled source. If the
SCL line is obstructed (pulled LOW) by a device on the bus, no further serial transfer is
possible, and the I2C hardware cannot resolve this type of problem. When this occurs, the
problem must be resolved by the device that is pulling the SCL bus line LOW.
If the SDA line is obstructed by another device on the bus (e.g., a slave device out of bit
synchronization), the problem can be solved by transmitting additional clock pulses on the
the STA flag is set, but no START condition can be generated because the SDA line is
pulled LOW while the I2C bus is considered free. The I2C hardware attempts to generate a
START condition after every two additional clock pulses on the SCL line. When the SDA
line is eventually released, a normal START condition is transmitted, state 0x08 is
entered, and the serial transfer continues.
If a forced bus access occurs or a repeated START condition is transmitted while SDA is
obstructed (pulled LOW), the I2C hardware performs the same action as described above.
In each case, state 0x08 is entered after a successful START condition is transmitted and
normal serial transfer continues. Note that the CPU is not involved in solving these bus
hang-up problems.
9.11 Bus error
A bus error occurs when a START or STOP condition is present at an illegal position in the
format frame. Examples of illegal positions are during the serial transfer of an address
byte, a data bit, or an acknowledge bit.
The I2C hardware only reacts to a bus error when it is involved in a serial transfer either as
a master or an addressed slave. When a bus error is detected, the I2C block immediately
switches to the not addressed slave mode, releases the SDA and SCL lines, sets the
interrupt flag, and loads the status register with 0x00. This status code may be used to
vector to a state service routine which either attempts the aborted serial transfer again or
OTHER MASTER
CONTINUES
S
SLA
W
A
DATA
A
S
P
S
SLA
08H
08H
18H
28H
other Master sends
repeated START earlier
retry
Fig 124. Simultaneous repeated START conditions from 2 masters
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time limit
STA flag
STO flag
SDA line
SCL line
start
condition
Fig 125. Forced access to a busy I2C bus
STA flag
(2)
(3)
(1)
(1)
SDA line
SCL line
start
condition
(1) Unsuccessful attempt to send a start condition.
(2) SDA line is released.
(3) Successful attempt to send a start condition. State 08H is entered.
Fig 126. Recovering from a bus obstruction caused by a low level on SDA
9.12 I2C State service routines
This section provides examples of operations that must be performed by various I2C state
service routines. This includes:
• Initialization of the I2C block after a Reset.
• I2C Interrupt Service.
• The 26 state service routines providing support for all four I2C operating modes.
9.12.1 Initialization
In the initialization example, the I2C block is enabled for both master and slave modes.
For each mode, a buffer is used for transmission and reception. The initialization routine
performs the following functions:
• I2ADR is loaded with the part’s own slave address and the general call bit (GC).
• The I2C interrupt enable and interrupt priority bits are set.
• The slave mode is enabled by simultaneously setting the I2EN and AA bits in I2CON
and the serial clock frequency (for master modes) is defined by loading CR0 and CR1
in I2CON. The master routines must be started in the main program.
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The I2C hardware now begins checking the I2C bus for its own slave address and general
call. If the general call or the own slave address is detected, an interrupt is requested and
I2STAT is loaded with the appropriate state information.
9.12.2 I2C interrupt service
When the I2C interrupt is entered, I2STAT contains a status code which identifies one of
the 26 state services to be executed.
9.12.3 The state service routines
Each state routine is part of the I2C interrupt routine and handles one of the 26 states.
9.12.4 Adapting state services to an application
The state service examples show the typical actions that must be performed in response
to the 26 I2C state codes. If one or more of the four I2C operating modes are not used, the
associated state services can be omitted, as long as care is taken that the those states
can never occur.
In an application, it may be desirable to implement some kind of timeout during I2C
operations, in order to trap an inoperative bus or a lost service routine.
10. Software example
10.1 Initialization routine
Example to initialize I2C Interface as a Slave and/or Master.
1. Load I2ADR with own Slave Address, enable general call recognition if needed.
2. Enable I2C interrupt.
3. Write 0x44 to I2CONSET to set the I2EN and AA bits, enabling Slave functions. For
Master only functions, write 0x40 to I2CONSET.
10.2 Start master transmit function
Begin a Master Transmit operation by setting up the buffer, pointer, and data count, then
initiating a Start.
1. Initialize Master data counter.
2. Set up the Slave Address to which data will be transmitted, and add the Write bit.
3. Write 0x20 to I2CONSET to set the STA bit.
4. Set up data to be transmitted in Master Transmit buffer.
5. Initialize the Master data counter to match the length of the message being sent.
6. Exit
10.3 Start master receive function
Begin a Master Receive operation by setting up the buffer, pointer, and data count, then
initiating a Start.
1. Initialize Master data counter.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
2. Set up the Slave Address to which data will be transmitted, and add the Read bit.
3. Write 0x20 to I2CONSET to set the STA bit.
4. Set up the Master Receive buffer.
5. Initialize the Master data counter to match the length of the message to be received.
6. Exit
10.4 I2C interrupt routine
Determine the I2C state and which state routine will be used to handle it.
1. Read the I2C status from I2STA.
2. Use the status value to branch to one of 26 possible state routines.
10.5 Non mode specific states
10.5.1 State : 0x00
Bus Error. Enter not addressed Slave mode and release bus.
1. Write 0x14 to I2CONSET to set the STO and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.6 Master states
State 08 and State 10 are for both Master Transmit and Master Receive modes. The R/W
bit decides whether the next state is within Master Transmit mode or Master Receive
mode.
10.6.1 State : 0x08
A Start condition has been transmitted. The Slave Address + R/W bit will be transmitted,
an ACK bit will be received.
1. Write Slave Address with R/W bit to I2DAT.
2. Write 0x04 to I2CONSET to set the AA bit.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Set up Master Transmit mode data buffer.
5. Set up Master Receive mode data buffer.
6. Initialize Master data counter.
7. Exit
10.6.2 State : 0x10
A repeated Start condition has been transmitted. The Slave Address + R/W bit will be
transmitted, an ACK bit will be received.
1. Write Slave Address with R/W bit to I2DAT.
2. Write 0x04 to I2CONSET to set the AA bit.
3. Write 0x08 to I2CONCLR to clear the SI flag.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
4. Set up Master Transmit mode data buffer.
5. Set up Master Receive mode data buffer.
6. Initialize Master data counter.
7. Exit
10.7 Master Transmitter states
10.7.1 State : 0x18
Previous state was State 8 or State 10, Slave Address + Write has been transmitted, ACK
has been received. The first data byte will be transmitted, an ACK bit will be received.
1. Load I2DAT with first data byte from Master Transmit buffer.
2. Write 0x04 to I2CONSET to set the AA bit.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Increment Master Transmit buffer pointer.
5. Exit
10.7.2 State : 0x20
Slave Address + Write has been transmitted, NOT ACK has been received. A Stop
condition will be transmitted.
1. Write 0x14 to I2CONSET to set the STO and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.7.3 State : 0x28
Data has been transmitted, ACK has been received. If the transmitted data was the last
data byte then transmit a Stop condition, otherwise transmit the next data byte.
1. Decrement the Master data counter, skip to step 5 if not the last data byte.
2. Write 0x14 to I2CONSET to set the STO and AA bits.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Exit
5. Load I2DAT with next data byte from Master Transmit buffer.
6. Write 0x04 to I2CONSET to set the AA bit.
7. Write 0x08 to I2CONCLR to clear the SI flag.
8. Increment Master Transmit buffer pointer
9. Exit
10.7.4 State : 0x30
Data has been transmitted, NOT ACK received. A Stop condition will be transmitted.
1. Write 0x14 to I2CONSET to set the STO and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
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10.7.5 State : 0x38
Arbitration has been lost during Slave Address + Write or data. The bus has been
released and not addressed Slave mode is entered. A new Start condition will be
transmitted when the bus is free again.
1. Write 0x24 to I2CONSET to set the STA and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.8 Master Receive states
10.8.1 State : 0x40
Previous state was State 08 or State 10. Slave Address + Read has been transmitted,
ACK has been received. Data will be
received and ACK returned.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.8.2 State : 0x48
Slave Address + Read has been transmitted, NOT ACK has been received. A Stop
condition will be transmitted.
1. Write 0x14 to I2CONSET to set the STO and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.8.3 State : 0x50
Data has been received, ACK has been returned. Data will be read from I2DAT. Additional
data will be received. If this is the last data byte then NOT ACK will be returned, otherwise
ACK will be returned.
1. Read data byte from I2DAT into Master Receive buffer.
2. Decrement the Master data counter, skip to step 5 if not the last data byte.
3. Write 0x0C to I2CONCLR to clear the SI flag and the AA bit.
4. Exit
5. Write 0x04 to I2CONSET to set the AA bit.
6. Write 0x08 to I2CONCLR to clear the SI flag.
7. Increment Master Receive buffer pointer
8. Exit
10.8.4 State : 0x58
Data has been received, NOT ACK has been returned. Data will be read from I2DAT. A
Stop condition will be transmitted.
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1. Read data byte from I2DAT into Master Receive buffer.
2. Write 0x14 to I2CONSET to set the STO and AA bits.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Exit
10.9 Slave Receiver states
10.9.1 State : 0x60
Own Slave Address + Write has been received, ACK has been returned. Data will be
received and ACK returned.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Set up Slave Receive mode data buffer.
4. Initialize Slave data counter.
5. Exit
10.9.2 State : 0x68
Arbitration has been lost in Slave Address and R/W bit as bus Master. Own Slave Address
+ Write has been received, ACK has been returned. Data will be received and ACK will be
returned. STA is set to restart Master mode after the bus is free again.
1. Write 0x24 to I2CONSET to set the STA and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Set up Slave Receive mode data buffer.
4. Initialize Slave data counter.
5. Exit.
10.9.3 State : 0x70
General call has been received, ACK has been returned. Data will be received and ACK
returned.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Set up Slave Receive mode data buffer.
4. Initialize Slave data counter.
5. Exit
10.9.4 State : 0x78
Arbitration has been lost in Slave Address + R/W bit as bus Master. General call has been
received and ACK has been returned. Data will be received and ACK returned. STA is set
to restart Master mode after the bus is free again.
1. Write 0x24 to I2CONSET to set the STA and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
3. Set up Slave Receive mode data buffer.
4. Initialize Slave data counter.
5. Exit
10.9.5 State : 0x80
Previously addressed with own Slave Address. Data has been received and ACK has
been returned. Additional data will be read.
1. Read data byte from I2DAT into the Slave Receive buffer.
2. Decrement the Slave data counter, skip to step 5 if not the last data byte.
3. Write 0x0C to I2CONCLR to clear the SI flag and the AA bit.
4. Exit.
5. Write 0x04 to I2CONSET to set the AA bit.
6. Write 0x08 to I2CONCLR to clear the SI flag.
7. Increment Slave Receive buffer pointer.
8. Exit
10.9.6 State : 0x88
Previously addressed with own Slave Address . Data has been received and NOT ACK
has been returned. Received data will not be saved. Not addressed Slave mode is
entered.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.9.7 State : 0x90
Previously addressed with general call. Data has been received, ACK has been returned.
Received data will be saved. Only the first data byte will be received with ACK. Additional
data will be received with NOT ACK.
1. Read data byte from I2DAT into the Slave Receive buffer.
2. Write 0x0C to I2CONCLR to clear the SI flag and the AA bit.
3. Exit
10.9.8 State : 0x98
Previously addressed with general call. Data has been received, NOT ACK has been
returned. Received data will not be saved. Not addressed Slave mode is entered.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.9.9 State : 0xA0
A Stop condition or repeated Start has been received, while still addressed as a Slave.
Data will not be saved. Not addressed Slave mode is entered.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
10.10 Slave Transmitter States
10.10.1 State : 0xA8
Own Slave Address + Read has been received, ACK has been returned. Data will be
transmitted, ACK bit will be received.
1. Load I2DAT from Slave Transmit buffer with first data byte.
2. Write 0x04 to I2CONSET to set the AA bit.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Set up Slave Transmit mode data buffer.
5. Increment Slave Transmit buffer pointer.
6. Exit
10.10.2 State : 0xB0
Arbitration lost in Slave Address and R/W bit as bus Master. Own Slave Address + Read
has been received, ACK has been returned. Data will be transmitted, ACK bit will be
received. STA is set to restart Master mode after the bus is free again.
1. Load I2DAT from Slave Transmit buffer with first data byte.
2. Write 0x24 to I2CONSET to set the STA and AA bits.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Set up Slave Transmit mode data buffer.
5. Increment Slave Transmit buffer pointer.
6. Exit
10.10.3 State : 0xB8
Data has been transmitted, ACK has been received. Data will be transmitted, ACK bit will
be received.
1. Load I2DAT from Slave Transmit buffer with data byte.
2. Write 0x04 to I2CONSET to set the AA bit.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Increment Slave Transmit buffer pointer.
5. Exit
10.10.4 State : 0xC0
Data has been transmitted, NOT ACK has been received. Not addressed Slave mode is
entered.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
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Chapter 22: LPC24XX I2C interfaces I2C0/1/2
3. Exit
10.10.5 State : 0xC8
The last data byte has been transmitted, ACK has been received. Not addressed Slave
mode is entered.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
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1. Basic configuration
The I2S interface is configured using the following registers:
Remark: On reset, the I2S interface is disabled (PCI2S = 0).
3. Pins: Select I2S pins and their modes in PINSEL0 to PINSEL4 and PINMODE0 to
2. Features
The I2S bus provides a standard communication interface for digital audio applications.
The I2S bus specification defines a 3-wire serial bus, having 1 data, 1 clock, and one word
select signal. The basic I2S connection has one master, which is always the master, and
one slave. The I2S interface on the LPC2400 provides a separate transmit and receive
channel, each of which can operate as either a master or a slave.
• The I2S output can operate in both master and slave mode, independent of the I2S
input.
• Capable of handling 8, 16, and 32 bit word sizes.
• Mono and stereo audio data supported.
• The sampling frequency can range (in practice) from 16 - 96 kHz. (16, 22.05, 32, 44.1,
48, 96 kHz) for audio applications.
• Word Select period in master mode is configurable (separately for I2S input and I2S
output).
• Two 8 word FIFO data buffers are provided, one for transmit and one for receive.
• Generates interrupt requests when buffer levels cross a programmable boundary.
• Two DMA requests, controlled by programmable buffer levels. These are connected
to the General Purpose DMA block.
• Controls include reset, stop and mute options separately for I2S input and I2S output.
3. Description
The I2S performs serial data out via the transmit channel and serial data in via the receive
channel. These support the NXP Inter IC Audio format for 8, 16 and 32 bits audio data
both for stereo and mono modes. Configuration, data access and control is performed by
a APB register set. Data streams are buffered by FIFOs with a depth of 8 bytes.
The I2S receive and transmit stage can operate independently in either slave or master
mode. Within the I2S module the difference between these modes lies in the word select
(WS) signal which determines the timing of data transmissions. Data words start on the
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next falling edge of the transmitting clock after a WS change. In stereo mode when WS is
low left data is transmitted and right data when WS is high. In mono mode the same data
is transmitted twice, once when WS is low and again when WS is high.
• In master mode (ws_sel = 0), word select is generated internally with a 9 bit counter.
The half period count value of this counter can be set in the control register.
• In slave mode (ws_sel = 1) word select is input from the relevant bus pin.
• When an I2S bus is active, the word select, receive clock and transmit clock signals
are sent continuously by the bus master, while data is sent continuously by the
transmitter.
• Disabling the I2S can be done with the stop or mute control bits separately for the
transmit and receive.
• The stop bit will disable accesses by the transmit channel or the receive channel to
the FIFOs and will place the transmit channel in mute mode.
• The mute control bit will place the transmit channel in mute mode. In mute mode, the
transmit channel FIFO operates normally, but the output is discarded and replaced by
zeroes. This bit does not affect the receive channel, data reception can occur
normally.
4. Pin descriptions
Table 530. Pin descriptions
Pin Name Type
Description
I2SRX_CLK Input/Output Receive Clock. A clock signal used to synchronize the transfer of
data on the receive channel. It is driven by the master and received
by the slave. Corresponds to the signal SCK in the I2S bus
specification.
I2SRX_WS
Input/Output Receive Word Select. Selects the channel from which data is to be
received. It is driven by the master and received by the slave.
Corresponds to the signal WS in the I2S bus specification.
WS = 0 indicates that data is being received by channel 1 (left
channel).
WS = 1 indicates that data is being received by channel 2 (right
channel).
I2SRX_SDA Input/Output Receive Data. Serial data, received MSB first. It is driven by the
transmitter and read by the receiver. Corresponds to the signal SD
in the I2S bus specification.
I2STX_CLK Input/Output Transmit Clock. A clock signal used to synchronize the transfer of
data on the transmit channel. It is driven by the master and received
by the slave. Corresponds to the signal SCK in the I2S bus
specification.
I2STX_WS
Input/Output Transmit Word Select. Selects the channel to which data is being
sent. It is driven by the master and received by the slave.
Corresponds to the signal WS in the I2S bus specification.
WS = 0 indicates that data is being sent to channel 1 (left channel).
WS = 1 indicates that data is being sent to channel 2 (right channel).
I2STX_SDA Input/Output Transmit Data. Serial data, sent MSB first. It is driven by the
transmitter and read by the receiver. Corresponds to the signal SD
in the I2S bus specification.
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Chapter 23: LPC24XX I2S interface
SCK: serial clock
SCK: serial clock
TRANSMITTER
(MASTER)
RECEIVER
(SLAVE)
TRANSMITTER
(SLAVE)
RECEIVER
(MASTER)
WS: word select
SD: serial data
WS: word select
SD: serial data
CONTROLLER
(MASTER)
SCK
WS
SD
TRANSMITTER
(SLAVE)
RECEIVER
(SLAVE)
SCK
WS
SD
MSB
LSB
MSB
word n-1
right channel
word n
left channel
word n+1
right channel
Fig 127. Simple I2S configurations and bus timing
5. Register description
their functions. Following the table are details for each register.
Table 531. Summary of I2S registers
Name
Description
Access Reset
Value[1]
Address
I2SDAO
I2SDAI
Digital Audio Output Register. Contains control R/W
bits for the I2S transmit channel.
0xE008 8000
0xE008 8004
0xE008 8008
0xE008 800C
0xE008 8010
0xE008 8014
0xE008 8018
Digital Audio Input Register. Contains control
bits for the I2S receive channel.
R/W
I2STXFIFO Transmit FIFO. Access register for the 8 × 32 bit WO
transmitter FIFO.
I2SRXFIFO Receive FIFO. Access register for the 8 × 32 bit RO
receiver FIFO.
I2SSTATE
I2SDMA1
I2SDMA2
Status Feedback Register. Contains status
information about the I2S interface.
RO
DMA Configuration Register 1. Contains control R/W
information for DMA request 1.
DMA Configuration Register 2. Contains control R/W
information for DMA request 2.
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Chapter 23: LPC24XX I2S interface
Table 531. Summary of I2S registers
Name
Description
Access Reset
Value[1]
Address
I2SIRQ
Interrupt Request Control Register. Contains bits R/W
that control how the I2S interrupt request is
generated.
0xE008 801C
I2STXRATE Transmit bit rate divider. This register
determines the I2S transmit bit rate by specifying
the value to divide pclk by in order to produce
the transmit bit clock.
R/W
0xE008 8020
0xE008 8024
I2SRXRATE Receive bit rate divider. This register determines R/W
the I2S receive bit rate by specifying the value to
divide pclk by in order to produce the receive bit
clock.
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
5.1 Digital Audio Output Register (I2SDAO - 0xE008 8000)
The I2SDAO register controls the operation of the I2S transmit channel. The function of
Table 532: Digital Audio Output register (I2SDAO - address 0xE008 8000) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
wordwidth
Selects the number of bytes in data as follows:
01
00 8 bit data
01 16 bit data
10 Reserved, do not use this setting
11 32 bit data
2
3
mono
stop
When one, data is of monaural format. When zero, the
data is in stereo format.
0
0
Disables accesses on FIFOs, places the transmit
channel in mute mode.
4
5
reset
Asynchronously reset the transmit channel and FIFO.
When 0 master mode, when 1 slave mode.
0
1
ws_sel
14:6 ws_halfperiod
Word select half period minus one, i.e. WS 64clk period 0x1F
-> ws_halfperiod = 31.
15 mute
When true, the transmit channel sends only zeroes.
1
5.2 Digital Audio Input Register (I2SDAI - 0xE008 8004)
The I2SDAI register controls the operation of the I2S receive channel. The function of bits
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Table 533: Digital Audio Input register (I2SDAI - address 0xE008 8004) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
wordwidth
Selects the number of bytes in data as follows:
01
00 8 bit data
01 16 bit data
10 Reserved, do not use this setting
11 32 bit data
2
3
mono
stop
When one, data is of monaural format. When zero, the
data is in stereo format.
0
0
Disables accesses on FIFOs, places the transmit
channel in mute mode.
4
reset
Asynchronously reset the transmit channel and FIFO.
When 0 master mode, when 1 slave mode.
0
1
5
ws_sel
14:6
ws_halfperiod
Word select half period minus one, i.e. WS 64clk period 0x1F
-> ws_halfperiod = 31.
15
Unused
Unused.
1
5.3 Transmit FIFO Register (I2STXFIFO - 0xE008 8008)
The I2STXFIFO register provides access to the transmit FIFO. The function of bits in
Table 534: Transmit FIFO register (I2STXFIFO - address 0xE008 8008) bit description
Bit
Symbol
Description
Reset Value
31:0 I2STXFIFO
8 × 32 bits transmit FIFO.
Level = 0
5.4 Receive FIFO Register (I2SRXFIFO - 0xE008 800C)
The I2SRXFIFO register provides access to the receive FIFO. The function of bits in
Table 535: Receive FIFO register (I2RXFIFO - address 0xE008 800C) bit description
Bit
Symbol
Description
Reset Value
31:0 I2SRXFIFO
8 × 32 bits transmit FIFO.
level = 0
5.5 Status Feedback Register (I2SSTATE - 0xE008 8010)
The I2SSTATE register provides status information about the I2S interface. The meaning
Table 536: Status Feedback register (I2SSTATE - address 0xE008 8010) bit description
Bit
Symbol Description
Reset
Value
0
irq
This bit reflects the presence of Receive Interrupt or Transmit Interrupt. 0
1
dmareq1 This bit reflects the presence of Receive or Transmit DMA Request 1.
dmareq2 This bit reflects the presence of Receive or Transmit DMA Request 2.
0
0
0
2
7:3
Unused
Unused.
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Table 536: Status Feedback register (I2SSTATE - address 0xE008 8010) bit description
Bit Symbol Description
Reset
Value
15:8 rx_level
23:16 tx_level
Reflects the current level of the Receive FIFO.
Reflects the current level of the Transmit FIFO.
0
0
31:24
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
5.6 DMA Configuration Register 1 (I2SDMA1 - 0xE008 8014)
The I2SDMA1 register controls the operation of DMA request 1. The function of bits in
chapter for details of DMA operation.
Table 537: DMA Configuration register 1 (I2SDMA1 - address 0xE008 8014) bit description
Bit
Symbol
Description
Reset
Value
0
rx_dma1_enable
tx_dma1_enable
Unused
When 1, enables DMA1 for I2S receive.
When 1, enables DMA1 for I2S transmit.
Unused.
0
0
0
0
1
7:2
15:8
rx_depth_dma1
Set the FIFO level that triggers a receive DMA request on
DMA1.
23:16 tx_depth_dma1
31:24
Set the FIFO level that triggers a transmit DMA request on
DMA1.
0
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
5.7 DMA Configuration Register 2 (I2SDMA2 - 0xE008 8018)
The I2SDMA2 register controls the operation of DMA request 2. The function of bits in
Table 538: DMA Configuration register 2 (I2SDMA2 - address 0xE008 8018) bit description
Bit
Symbol
Description
Reset
Value
0
rx_dma2_enable
tx_dma2_enable
Unused
When 1, enables DMA1 for I2S receive.
When 1, enables DMA1 for I2S transmit.
Unused.
0
0
0
0
1
7:2
15:8
rx_depth_dma2
Set the FIFO level that triggers a receive DMA request
on DMA2.
23:16 tx_depth_dma2
31:24
Set the FIFO level that triggers a transmit DMA request
on DMA2.
0
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
5.8 Interrupt Request Control Register (I2SIRQ - 0xE008 801C)
The I2SIRQ register controls the operation of the I2S interrupt request. The function of bits
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Chapter 23: LPC24XX I2S interface
Table 539: Interrupt Request Control register (I2SIRQ - address 0xE008 801C) bit description
Bit
Symbol
Description
Reset
Value
0
rx_Irq_enable
tx_Irq_enable
Unused
When 1, enables I2S receive interrupt.
When 1, enables I2S transmit interrupt.
Unused.
0
1
0
7:2
15:8
0
rx_depth_Irq
Set the FIFO level on which to create an irq request.
Set the FIFO level on which to create an irq request.
0
23:16 tx_depth_Irq
31:24
0
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
5.9 Transmit Clock Rate Register (I2STXRATE - 0xE008 8020)
The bit rate for the I2S transmitter is determined by the value of the I2STXRATE register.
The value depends on the audio sample rate desired, and the data size and format
(stereo/mono) used. For example, a 48 kHz sample rate for 16 bit stereo data requires a
bit rate of 48,000×16×2 = 1.536 MHz.
Table 540: Transmit Clock Rate register (I2TXRATE - address 0xE008 8020) bit description
Bit
Symbol
Description
Reset
Value
9:0
tx_rate
I2S transmit bit rate. This value plus one is used to divide PCLK by
to produce the transmit bit clock. Ten bits of divide supports a wide
range of I2S rates over a wide range of pclk rates.
0
15:10 Unused
Unused.
0
5.10 Receive Clock Rate Register (I2SRXRATE - 0xE008 8024)
The bit rate for the I2S receiver is determined by the value of the I2SRXRATE register.
The value depends on the audio sample rate, as well as the data size and format used.
The calculation is the same as for I2STXRATE.
Table 541: Receive Clock Rate register (I2SRXRATE - address 0xE008 8024) bit description
Bit
Symbol
Description
Reset
Value
9:0
rx_rate
I2S receive bit rate. This value plus one is used to divide PCLK by
to produce the receive bit clock. Ten bits of divide supports a wide
range of I2S rates over a wide range of pclk rates.
0
15:10 Unused
Unused.
0
6. I2S transmit and receive interfaces
The I2S interface can transmit and receive 8, 16 or 32 bits stereo or mono audio
information. Some details of I2S implementation are:
• When the FIFO is empty, the transmit channel will repeat transmitting the same data
until new data is written to the FIFO.
• When mute is true, the data value 0 is transmitted.
• When mono is false, two successive data words are respectively left and right data.
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Chapter 23: LPC24XX I2S interface
• Data word length is determined by the wordwidth value in the configuration register.
There is a separate wordwidth value for the receive channel and the transmit channel.
– 0: word is considered to contain four 8 bits data words.
– 1: word is considered to contain two 16 bits data words.
– 3: word is considered to contain one 32 bits data word.
• When the transmit FIFO contains insufficient data the transmit channel will repeat
transmitting the last data until new data is available. This can occur when the
microprocessor or the DMA at some time is unable to provide new data fast enough.
Because of this delay in new data there is a need to fill the gap, which is
accomplished by continuing to transmit the last sample. The data is not muted as this
would produce an noticeable and undesirable effect in the sound.
• The transmit channel and the receive channel only handle 32 bit aligned words, data
chunks must be clipped or extended to a multiple of 32 bits.
When switching between data width or modes the I2S must be reset via the reset bit in the
control register in order to ensure correct synchronization. It is advisable to set the stop bit
also until sufficient data has been written in the transmit FIFO. Note that when stopped
data output is muted.
sequences.
A data sample in the FIFO consists of:
• 1×32 bits in 8 or 16 bit stereo modes.
• 1×32 bits in mono modes.
• 2×32 bits, first left data, second right data, in 32 bit stereo modes.
Data is read from the transmit FIFO after the falling edge of WS, it will be transferred to
the transmit clock domain after the rising edge of WS. On the next falling edge of WS the
left data will be loaded in the shift register and transmitted and on the following rising edge
of WS the right data is loaded and transmitted.
The receive channel will start receiving data after a change of WS. When word select
becomes low it expects this data to be left data, when WS is high received data is
expected to be right data. Reception will stop when the bit counter has reached the limit
set by wordwidth. On the next change of WS the received data will be stored in the
appropriate hold register. When complete data is available it will be written into the receive
FIFO.
7. FIFO controller
Handling of data for transmission and reception is performed via the FIFO controller which
can generate two DMA requests and an interrupt request. The controller consists of a set
of comparators which compare FIFO levels with depth settings contained in registers. The
current status of the level comparators can be seen in the APB status register.
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Chapter 23: LPC24XX I2S interface
Table 542. Conditions for FIFO level comparison
Level Comparison
Condition
dmareq_tx_1
dmareq_rx_1
dmareq_tx_2
dmareq_rx_2
irq_tx
tx_depth_dma1 >= tx_level
rx_depth_dma1 <= rx_level
tx_depth_dma2 >= tx_level
rx_depth_dma2 <= rx_level
tx_depth_irq >= tx_level
rx_depth_irq <= rx_level
irq_rx
System signaling occurs when a level detection is true and enabled.
Table 543. DMA and interrupt request generation
System Signaling
irq
Condition
(irq_rx & rx_irq_enable) | (irq_tx & tx_irq_enable
dmareq[0]
(dmareq_tx_1 & tx_dma1_enable ) | (dmareq_rx_1 &
rx_dma1_enable )
dmareq[1]
( dmareq_tx_2 & tx_dma2_enable ) | (dmareq_rx_2 &
rx_dma2_enable )
Table 544. Status feedback in the I2SSTATE register
Status Feedback
irq
Status
irq_rx | irq_tx
dmareq1
dmareq2
(dmareq_tx_1 | dmareq_rx_1)
(dmareq_rx_2 | dmareq_tx_2)
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Chapter 23: LPC24XX I2S interface
Mono 8-bit data mode
N + 3
7
N + 2
N + 1
LEFT
N
0
0
7
7
0
0
0
0
7
0
0
7
0
0
0
0
0
Stereo 8-bit data mode
LEFT + 1
7
RIGHT + 1
RIGHT
7
7
Mono 16-bit data mode
15
N + 1
LEFT
N
15
15
Stereo 16-bit data mode
15
RIGHT
Mono 32-bit data mode
31
N
Stereo 32-bit data mode
31
LEFT
N
0
0
RIGHT
N + 1
31
Fig 128. FIFO contents for various I2S modes
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Chapter 24: LPC24XX Timer0/1/2/3
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1. Basic configuration
The Timer0/1/2/3 peripherals are configured using the following registers:
Remark: On reset, Timer0/1 are enabled (PCTIM0/1 = 1), and Timer2/3 are disabled
(PCTIM2/3 = 0).
3. Pins: Select Timer0/1/2/3 pins and pin modes in registers PINSELn and PINMODEn
2. Features
Remark: The four Timer/Counters are identical except for the peripheral base address. A
minimum of two Capture inputs and two Match outputs are pinned out for all four timers,
with a choice of several pins for each. Timer 1 brings out a third Match output, while
Timers 2 and 3 bring out all four Match outputs.
• A 32 bit Timer/Counter with a programmable 32 bit Prescaler.
• Counter or Timer operation
• Up to four 32 bit capture channels per timer, that can take a snapshot of the timer
value when an input signal transitions. A capture event may also optionally generate
an interrupt.
• Four 32 bit match registers that allow:
– Continuous operation with optional interrupt generation on match.
– Stop timer on match with optional interrupt generation.
– Reset timer on match with optional interrupt generation.
• Up to four external outputs corresponding to match registers, with the following
capabilities:
– Set low on match.
– Set high on match.
– Toggle on match.
– Do nothing on match.
3. Applications
• Interval Timer for counting internal events.
• Pulse Width Demodulator via Capture inputs.
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Chapter 24: LPC24XX Timer0/1/2/3
• Free running timer.
4. Description
The Timer/Counter is designed to count cycles of the peripheral clock (PCLK) or an
externally-supplied clock, and can optionally generate interrupts or perform other actions
at specified timer values, based on four match registers. It also includes four capture
inputs to trap the timer value when an input signal transitions, optionally generating an
interrupt.
5. Pin description
Table 545. Timer/Counter pin description
Pin
Type
Description
CAP0[1:0] Input
CAP1[1:0]
CAP2[1:0]
Capture Signals- A transition on a capture pin can be configured to load one
of the Capture Registers with the value in the Timer Counter and optionally
generate an interrupt. Capture functionality can be selected from a number
of pins. When more than one pin is selected for a Capture input on a single
TIMER0/1 channel, the pin with the lowest Port number is used
CAP3[1:0]
Timer/Counter block can select a capture signal as a clock source instead of
the PCLK derived clock. For more details see Section 24–6.3 “Count Control
MAT0[1:0] Output External Match Output 0/1- When a match register 0/1 (MR3:0) equals the
MAT1[2:0]
MAT2[3:0]
MAT3[3:0]
timer counter (TC) this output can either toggle, go low, go high, or do
nothing. The External Match Register (EMR) controls the functionality of this
output. Match Output functionality can be selected on a number of pins in
parallel.
5.1 Multiple CAP and MAT pins
Software can select multiple pins for most of the CAP or MAT functions in the Pin Select
MAT output, all such pins are driven identically. When more than one pin is selected for a
CAP input, the pin with the lowest port number is used.
6. Register description
the data stored in used bits only; it does not include reserved bits content). More detailed
descriptions follow.
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Chapter 24: LPC24XX Timer0/1/2/3
Table 546. Summary of timer/counter registers
Generic Description
Name
Access Reset
TIMERn Register/
IR
Interrupt Register. The IR can be written to R/W
0
0
0
0
0
T0IR - 0xE000 4000
T1IR - 0xE000 8000
T2IR - 0xE007 0000
T3IR - 0xE007 4000
clear interrupts. The IR can be read to
identify which of eight possible interrupt
sources are pending.
TCR
TC
PR
PC
Timer Control Register. The TCR is used to R/W
control the Timer Counter functions. The
Timer Counter can be disabled or reset
through the TCR.
T0TCR - 0xE000 4004
T1TCR - 0xE000 8004
T2TCR - 0xE007 0004
T3TCR - 0xE007 4004
Timer Counter. The 32 bit TC is
incremented every PR+1 cycles of PCLK.
The TC is controlled through the TCR.
R/W
R/W
R/W
T0TC - 0xE000 4008
T1TC - 0xE000 8008
T2TC - 0xE007 0008
T3TC - 0xE007 4008
Prescale Register. The Prescale Counter
(below) is equal to this value, the next clock
increments the TC and clears the PC.
T0PR - 0xE000 400C
T1PR - 0xE000 800C
T2PR - 0xE007 000C
T3PR - 0xE007 400C
Prescale Counter. The 32 bit PC is a
counter which is incremented to the value
stored in PR. When the value in PR is
reached, the TC is incremented and the PC
is cleared. The PC is observable and
controllable through the bus interface.
T0PC - 0xE000 4010
T1PC - 0xE000 8010
T2PC - 0xE007 0010
T3PC - 0xE007 4010
MCR
MR0
MR1
MR2
MR3
CCR
Match Control Register. The MCR is used R/W
to control if an interrupt is generated and if
the TC is reset when a Match occurs.
0
0
0
0
0
0
T0MCR - 0xE000 4014
T1MCR - 0xE000 8014
T2MCR - 0xE007 0014
T3MCR - 0xE007 4014
Match Register 0. MR0 can be enabled
through the MCR to reset the TC, stop both
the TC and PC, and/or generate an
R/W
R/W
R/W
R/W
R/W
T0MR0 - 0xE000 4018
T1MR0 - 0xE000 8018
T2MR0 - 0xE007 0018
T3MR0 - 0xE007 4018
interrupt every time MR0 matches the TC.
Match Register 1. See MR0 description.
Match Register 2. See MR0 description.
Match Register 3. See MR0 description.
T0MR1 - 0xE000 401C
T1MR1 - 0xE000 801C
T2MR1 - 0xE007 001C
T3MR1 - 0xE007 401C
T0MR2 - 0xE000 4020
T1MR2 - 0xE000 8020
T2MR2 - 0xE007 0020
T3MR2 - 0xE007 4020
T0MR3 - 0xE000 4024
T1MR3 - 0xE000 8024
T2MR3 - 0xE007 0024
T3MR3 - 0xE007 4024
Capture Control Register. The CCR
controls which edges of the capture inputs
are used to load the Capture Registers and
whether or not an interrupt is generated
when a capture takes place.
T0CCR - 0xE000 4028
T1CCR - 0xE000 8028
T2CCR - 0xE007 0028
T3CCR - 0xE007 4028
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Chapter 24: LPC24XX Timer0/1/2/3
Table 546. Summary of timer/counter registers …continued
Generic Description
Name
Access Reset
TIMERn Register/
Value[1] Name & Address
CR0
Capture Register 0. CR0 is loaded with the RO
0
0
0
0
T0CR0 - 0xE000 402C
T1CR0 - 0xE000 802C
T2CR0 - 0xE007 002C
T3CR0 - 0xE007 402C
value of TC when there is an event on the
CAPn[0] (CAP0[0], CAP1[0], CAP2[0],
CAP3[0]) inputs.
CR1
Capture Register 1. CR1 is loaded with the RO
value of TC when there is an event on the
CAPn[1] pins (CAP0[1], CAP1[1], CAP2[1],
CAP3[1]) inputs.
T0CR1 - 0xE000 4030
T1CR1 - 0xE000 8030
T2CR1 - 0xE007 0030
T3CR1 - 0xE007 4030
EMR
CTCR
External Match Register. The EMR controls R/W
the external match pins MATn.0-3
(MAT0.0-3 and MAT1.0-3 respectively).
T0EMR - 0xE000 403C
T1EMR - 0xE000 803C
T2EMR - 0xE007 003C
T3EMR - 0xE007 403C
Count Control Register. The CTCR selects R/W
between Timer and Counter mode, and in
Counter mode selects the signal and
edge(s) for counting.
T0CTCR -
0xE000 4070
T1CTCR -
0xE000 8070
T2CTCR -
0xE007 0070
T3CTCR -
0xE007 4070
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
6.1 Interrupt Register (T[0/1/2/3]IR - 0xE000 4000, 0xE000 8000,
0xE007 0000, 0xE007 4000)
The Interrupt Register consists of four bits for the match interrupts and four bits for the
capture interrupts. If an interrupt is generated then the corresponding bit in the IR will be
high. Otherwise, the bit will be low. Writing a logic one to the corresponding IR bit will reset
the interrupt. Writing a zero has no effect.
Table 547: Interrupt Register (T[0/1/2/3]IR - addresses 0xE000 4000, 0xE000 8000,
0xE007 0000, 0xE007 4000) bit description
Bit Symbol
Description
Reset
Value
0
1
2
3
4
5
6
7
MR0 Interrupt Interrupt flag for match channel 0.
MR1 Interrupt Interrupt flag for match channel 1.
MR2 Interrupt Interrupt flag for match channel 2.
MR3 Interrupt Interrupt flag for match channel 3.
CR0 Interrupt Interrupt flag for capture channel 0 event.
CR1 Interrupt Interrupt flag for capture channel 1 event.
CR2 Interrupt Interrupt flag for capture channel 2 event.
CR3 Interrupt Interrupt flag for capture channel 3 event.
0
0
0
0
0
0
0
0
6.2 Timer Control Register (T[0/1/2/3]CR - 0xE000 4004, 0xE000 8004,
0xE007 0004, 0xE007 4004)
The Timer Control Register (TCR) is used to control the operation of the Timer/Counter.
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Chapter 24: LPC24XX Timer0/1/2/3
Table 548: Timer Control Register (TCR, TIMERn: TnTCR - addresses 0xE000 4004,
0xE000 8004, 0xE007 0004, 0xE007 4004) bit description
Bit
Symbol
Description
Reset Value
0
Counter Enable When one, the Timer Counter and Prescale Counter are
enabled for counting. When zero, the counters are
disabled.
0
1
Counter Reset When one, the Timer Counter and the Prescale Counter
are synchronously reset on the next positive edge of
PCLK. The counters remain reset until TCR[1] is
returned to zero.
0
7:2
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
6.3 Count Control Register (T[0/1/2/3]CTCR - 0xE000 4070, 0xE000 8070,
0xE007 0070, 0xE007 4070)
The Count Control Register (CTCR) is used to select between Timer and Counter mode,
and in Counter mode to select the pin and edge(s) for counting.
When Counter Mode is chosen as a mode of operation, the CAP input (selected by the
CTCR bits 3:2) is sampled on every rising edge of the PCLK clock. After comparing two
consecutive samples of this CAP input, one of the following four events is recognized:
rising edge, falling edge, either of edges or no changes in the level of the selected CAP
input. Only if the identified event corresponds to the one selected by bits 1:0 in the CTCR
register, the Timer Counter register will be incremented.
Effective processing of the externally supplied clock to the counter has some limitations.
Since two successive rising edges of the PCLK clock are used to identify only one edge
on the CAP selected input, the frequency of the CAP input can not exceed one quarter of
the PCLK clock. Consequently, duration of the high/low levels on the same CAP input in
this case can not be shorter than 1/(2 PCLK).
Table 549: Count Control Register (T[0/1/2/3]CTCR - addresses 0xE000 4070, 0xE000 8070,
0xE007 0070, 0xE007 4070) bit description
Bit
Symbol Value Description
Reset
Value
1:0
Counter/
Timer
Mode
This field selects which rising PCLK edges can increment
Timer’s Prescale Counter (PC), or clear PC and increment
Timer Counter (TC).
00
Timer Mode: the TC is incremented when the Prescale
Counter matches the Prescale Register.
00
01
Timer Mode: every rising PCLK edge
Counter Mode: TC is incremented on rising edges on the
CAP input selected by bits 3:2.
10
11
Counter Mode: TC is incremented on falling edges on the
CAP input selected by bits 3:2.
Counter Mode: TC is incremented on both edges on the CAP
input selected by bits 3:2.
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Chapter 24: LPC24XX Timer0/1/2/3
Table 549: Count Control Register (T[0/1/2/3]CTCR - addresses 0xE000 4070, 0xE000 8070,
0xE007 0070, 0xE007 4070) bit description
Bit
Symbol Value Description
Reset
Value
3:2
Count
Input
When bits 1:0 in this register are not 00, these bits select
which CAP pin is sampled for clocking:
00
Select
00
01
CAPn.0 for TIMERn
CAPn.1 for TIMERn
Note: If Counter mode is selected for a particular CAPn input
in the TnCTCR, the 3 bits for that input in the Capture
Control Register (TnCCR) must be programmed as 000.
However, capture and/or interrupt can be selected for the
other 3 CAPn inputs in the same timer.
10
11
-
Reserved.
Reserved.
7:4
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.4 Timer Counter registers (T0TC - T3TC, 0xE000 4008, 0xE000 8008,
0xE007 0008, 0xE007 4008)
The 32-bit Timer Counter register is incremented when the prescale counter reaches its
terminal count. Unless it is reset before reaching its upper limit, the Timer Counter will
count up through the value 0xFFFF FFFF and then wrap back to the value 0x0000 0000.
This event does not cause an interrupt, but a match register can be used to detect an
overflow if needed.
6.5 Prescale register (T0PR - T3PR, 0xE000 400C, 0xE000 800C,
0xE007 000C, 0xE007 400C)
The 32-bit Prescale register specifies the maximum value for the Prescale Counter.
6.6 Prescale Counter register (T0PC - T3PC, 0xE000 4010, 0xE000 8010,
0xE007 0010, 0xE007 4010)
The 32-bit Prescale Counter controls division of PCLK by some constant value before it is
applied to the Timer Counter. This allows control of the relationship of the resolution of the
timer versus the maximum time before the timer overflows. The Prescale Counter is
incremented on every PCLK. When it reaches the value stored in the Prescale register,
the Timer Counter is incremented and the Prescale Counter is reset on the next PCLK.
This causes the Timer Counter to increment on every PCLK when PR = 0, every 2 PCLKs
when PR = 1, etc.
6.7 Match Registers (MR0 - MR3)
The Match register values are continuously compared to the Timer Counter value. When
the two values are equal, actions can be triggered automatically. The action possibilities
are to generate an interrupt, reset the Timer Counter, or stop the timer. Actions are
controlled by the settings in the MCR register.
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6.8 Match Control Register (T[0/1/2/3]MCR - 0xE000 4014, 0xE000 8014,
0xE007 0014, 0xE007 4014)
The Match Control Register is used to control what operations are performed when one of
the Match Registers matches the Timer Counter. The function of each of the bits is shown
Table 550: Match Control Register (T[0/1/2/3]MCR - addresses 0xE000 4014, 0xE000 8014,
0xE007 0014, 0xE007 4014) bit description
Bit
Symbol Value Description
Reset
Value
0
MR0I
1
Interrupt on MR0: an interrupt is generated when MR0 matches
the value in the TC.
0
0
1
0
1
This interrupt is disabled
1
2
MR0R
MR0S
Reset on MR0: the TC will be reset if MR0 matches it.
Feature disabled.
0
0
Stop on MR0: the TC and PC will be stopped and TCR[0] will be
set to 0 if MR0 matches the TC.
0
1
Feature disabled.
3
MR1I
Interrupt on MR1: an interrupt is generated when MR1 matches
the value in the TC.
0
0
1
0
1
This interrupt is disabled
4
5
MR1R
MR1S
Reset on MR1: the TC will be reset if MR1 matches it.
Feature disabled.
0
0
Stop on MR1: the TC and PC will be stopped and TCR[0] will be
set to 0 if MR1 matches the TC.
0
1
Feature disabled.
6
MR2I
Interrupt on MR2: an interrupt is generated when MR2 matches
the value in the TC.
0
0
1
0
1
This interrupt is disabled
7
8
MR2R
MR2S
Reset on MR2: the TC will be reset if MR2 matches it.
Feature disabled.
0
0
Stop on MR2: the TC and PC will be stopped and TCR[0] will be
set to 0 if MR2 matches the TC.
0
1
Feature disabled.
9
MR3I
Interrupt on MR3: an interrupt is generated when MR3 matches
the value in the TC.
0
0
1
0
1
This interrupt is disabled
10
11
MR3R
MR3S
Reset on MR3: the TC will be reset if MR3 matches it.
Feature disabled.
0
0
Stop on MR3: the TC and PC will be stopped and TCR[0] will be
set to 0 if MR3 matches the TC.
0
Feature disabled.
15:12 -
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
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Chapter 24: LPC24XX Timer0/1/2/3
6.9 Capture Registers (CR0 - CR3)
Each Capture register is associated with a device pin and may be loaded with the Timer
Counter value when a specified event occurs on that pin. The settings in the Capture
Control Register register determine whether the capture function is enabled, and whether
a capture event happens on the rising edge of the associated pin, the falling edge, or on
both edges.
6.10 Capture Control Register (T[0/1/2/3]CCR - 0xE000 4028, 0xE000 8028,
0xE007 0028, 0xE007 4028)
The Capture Control Register is used to control whether one of the four Capture Registers
is loaded with the value in the Timer Counter when the capture event occurs, and whether
an interrupt is generated by the capture event. Setting both the rising and falling bits at the
same time is a valid configuration, resulting in a capture event for both edges. In the
description below, "n" represents the Timer number, 0 or 1.
Note: If Counter mode is selected for a particular CAP input in the CTCR, the 3 bits for
that input in this register should be programmed as 000, but capture and/or interrupt can
be selected for the other 3 CAP inputs.
Table 551: Capture Control Register (T[0/1/2/3]CCR - addresses 0xE000 4028, 0xE000 8020,
0xE007 0028, 0xE007 4028) bit description
Bit
Symbol Value Description
Reset
Value
0
CAP0RE 1
Capture on CAPn.0 rising edge: a sequence of 0 then 1 on
CAPn.0 will cause CR0 to be loaded with the contents of TC.
0
0
0
0
0
0
0
This feature is disabled.
1
CAP0FE 1
Capture on CAPn.0 falling edge: a sequence of 1 then 0 on
CAPn.0 will cause CR0 to be loaded with the contents of TC.
0
This feature is disabled.
2
CAP0I
1
Interrupt on CAPn.0 event: a CR0 load due to a CAPn.0 event
will generate an interrupt.
0
This feature is disabled.
3
CAP1RE 1
Capture on CAPn.1 rising edge: a sequence of 0 then 1 on
CAPn.1 will cause CR1 to be loaded with the contents of TC.
0
This feature is disabled.
4
CAP1FE 1
Capture on CAPn.1 falling edge: a sequence of 1 then 0 on
CAPn.1 will cause CR1 to be loaded with the contents of TC.
0
This feature is disabled.
5
CAP1I
1
Interrupt on CAPn.1 event: a CR1 load due to a CAPn.1 event
will generate an interrupt.
0
This feature is disabled.
15:6
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
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Chapter 24: LPC24XX Timer0/1/2/3
6.11 External Match Register (T[0/1/2/3]EMR - 0xE000 403C, 0xE000 803C,
0xE007 003C, 0xE007 403C)
The External Match Register provides both control and status of the external match pins.
In the descriptions below, “n” represents the Timer number, 0,1, 2, or 3, and “m” represent
a Match number, 0 through 3.
Table 552: External Match Register (T[0/1/2/3]EMR - addresses 0xE000 403C, 0xE000 803C,
0xE007 003C, 0xE007 403C) bit description
Bit
Symbol Description
Reset
Value
0
EM0
EM1
EM2
EM3
External Match 0. When a match occurs between the TC and MR0, this
0
0
0
0
bit can either toggle, go low, go high, or do nothing, depending on bits 5:4
of this register. This bit can be driven onto a MATn.0 pin, in a
positive-logic manner (0 = low, 1 = high).
1
2
3
External Match 1. When a match occurs between the TC and MR1, this
bit can either toggle, go low, go high, or do nothing, depending on bits 7:6
of this register. This bit can be driven onto a MATn.1 pin, in a
positive-logic manner (0 = low, 1 = high).
External Match 2. When a match occurs between the TC and MR2, this
bit can either toggle, go low, go high, or do nothing, depending on bits 9:8
of this register. This bit can be driven onto a MATn.0 pin, in a
positive-logic manner (0 = low, 1 = high).
External Match 3. When a match occurs between the TC and MR3, this
bit can either toggle, go low, go high, or do nothing, depending on bits
11:10 of this register. This bit can be driven onto a MATn.0 pin, in a
positive-logic manner (0 = low, 1 = high).
5:4
7:6
9:8
EMC0
EMC1
EMC2
External Match Control 0. Determines the functionality of External Match 00
External Match Control 1. Determines the functionality of External Match 00
External Match Control 2. Determines the functionality of External Match 00
11:10 EMC3
15:12 -
External Match Control 3. Determines the functionality of External Match 00
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
Table 553. External Match Control
EMR[11:10], EMR[9:8], Function
EMR[7:6], or EMR[5:4]
00
01
Do Nothing.
Clear the corresponding External Match bit/output to 0 (MATn.m pin is
LOW if pinned out).
10
11
Set the corresponding External Match bit/output to 1 (MATn.m pin is
HIGH if pinned out).
Toggle the corresponding External Match bit/output.
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Chapter 24: LPC24XX Timer0/1/2/3
7. Example timer operation
Figure 24–129 shows a timer configured to reset the count and generate an interrupt on
match. The prescaler is set to 2 and the match register set to 6. At the end of the timer
cycle where the match occurs, the timer count is reset. This gives a full length cycle to the
match value. The interrupt indicating that a match occurred is generated in the next clock
after the timer reached the match value.
Figure 24–130 shows a timer configured to stop and generate an interrupt on match. The
prescaler is again set to 2 and the match register set to 6. In the next clock after the timer
reaches the match value, the timer enable bit in TCR is cleared, and the interrupt
indicating that a match occurred is generated.
PCLK
prescale
counter
2
4
0
1
5
2
0
1
6
2
0
1
0
2
0
1
timer
counter
1
timer counter
reset
interrupt
Fig 129. A timer cycle in which PR=2, MRx=6, and both interrupt and reset on match are enabled.
PCLK
prescale counter
timer counter
2
4
0
1
5
1
2
0
6
TCR[0]
(counter enable)
0
interrupt
Fig 130. A timer Cycle in Which PR=2, MRx=6, and both interrupt and stop on match are enabled
8. Architecture
The block diagram for TIMER/COUNTER0 and TIMER/COUNTER1 is shown in
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Chapter 24: LPC24XX Timer0/1/2/3
MATCH REGISTER 0
MATCH REGISTER 1
MATCH REGISTER 2
MATCH REGISTER 3
MATCH CONTROL REGISTER
EXTERNAL MATCH REGISTER
INTERRUPT REGISTER
CONTROL
=
MAT[3:0]
INTERRUPT
CAP[3:0]
=
=
STOP ON MATCH
RESET ON MATCH
LOAD[3:0]
=
CAPTURE CONTROL REGISTER
CSN
CAPTURE REGISTER 0
CAPTURE REGISTER 1
CAPTURE REGISTER 2
CAPTURE REGISTER 3
TIMER COUNTER
CE
TCI
PCLK
PRESCALE COUNTER
MAXVAL
reset
enable
TIMER CONTROL REGISTER
PRESCALE REGISTER
Fig 131. Timer block diagram
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
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User manual
1. Basic configuration
The PWM is configured using the following registers:
Remark: On reset, the both PWMs are enabled (PCPWM0/1 = 1).
3. Pins: Select PWM pins and pin modes in registers PINSELn and PINMODEn (see
2. Features
• Two PWMs with the same operational features. The PWMs may be operated in a
synchronized fashion by setting them both up to run at the same rate, then enabling
both simultaneously. PWM0 acts as the Master and PWM1 as the slave for this use.
• Counter or Timer operation (may use the peripheral clock or one of the capture inputs
as the clock source).
• Seven match registers allow up to 6 single edge controlled or 3 double edge
controlled PWM outputs, or a mix of both types. The match registers also allow:
– Continuous operation with optional interrupt generation on match.
– Stop timer on match with optional interrupt generation.
– Reset timer on match with optional interrupt generation.
• Supports single edge controlled and/or double edge controlled PWM outputs. Single
edge controlled PWM outputs all go high at the beginning of each cycle unless the
output is a constant low. Double edge controlled PWM outputs can have either edge
occur at any position within a cycle. This allows for both positive going and negative
going pulses.
• Pulse period and width can be any number of timer counts. This allows complete
flexibility in the trade-off between resolution and repetition rate. All PWM outputs will
occur at the same repetition rate.
• Double edge controlled PWM outputs can be programmed to be either positive going
or negative going pulses.
• Match register updates are synchronized with pulse outputs to prevent generation of
erroneous pulses. Software must "release" new match values before they can
become effective.
• May be used as a standard timer if the PWM mode is not enabled.
• A 32 bit Timer/Counter with a programmable 32 bit Prescaler.
• Three 32 bit capture channels take a snapshot of the timer value when an input signal
transitions. A capture event may also optionally generate an interrupt.
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
3. Description
The PWM is based on the standard Timer block and inherits all of its features, although
only the PWM function is pinned out on the microcontroller. The Timer is designed to
count cycles of the peripheral clock (PCLK) and optionally generate interrupts or perform
other actions when specified timer values occur, based on seven match registers. It also
includes four capture inputs to save the timer value when an input signal transitions, and
optionally generate an interrupt when those events occur. The PWM function is in addition
to these features, and is based on match register events.
The ability to separately control rising and falling edge locations allows the PWM to be
used for more applications. For instance, multi-phase motor control typically requires
three non-overlapping PWM outputs with individual control of all three pulse widths and
positions.
Two match registers can be used to provide a single edge controlled PWM output. One
match register (MR0) controls the PWM cycle rate, by resetting the count upon match.
The other match register controls the PWM edge position. Additional single edge
controlled PWM outputs require only one match register each, since the repetition rate is
the same for all PWM outputs. Multiple single edge controlled PWM outputs will all have a
rising edge at the beginning of each PWM cycle, when an MR0 match occurs.
Three match registers can be used to provide a PWM output with both edges controlled.
Again, the MR0 match register controls the PWM cycle rate. The other match registers
control the two PWM edge positions. Additional double edge controlled PWM outputs
require only two match registers each, since the repetition rate is the same for all PWM
outputs.
With double edge controlled PWM outputs, specific match registers control the rising and
falling edge of the output. This allows both positive going PWM pulses (when the rising
edge occurs prior to the falling edge), and negative going PWM pulses (when the falling
edge occurs prior to the rising edge).
Figure 25–132 shows the block diagram of the PWM. The portions that have been added
to the standard timer block are on the right hand side and at the top of the diagram. At the
lower left of the diagram may be found the Master Enable output from the Timer Control
register that allows the Master PWM (PWM0) to enable both itself and the Salve PWM
(PWM1) at the same time, if desired. The Master Enable output from PWM0 is connected
to the external enable input of both PWM blocks.
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
SHADOW REGISTER 0
LOAD ENABLE
MATCH REGISTER 0
MATCH REGISTER 1
SHADOW REGISTER 1
LOAD ENABLE
SHADOW REGISTER 2
LOAD ENABLE
MATCH REGISTER 2
MATCH REGISTER 3
MATCH REGISTER 4
MATCH REGISTER 5
MATCH REGISTER 6
SHADOW REGISTER 3
LOAD ENABLE
SHADOW REGISTER 4
LOAD ENABLE
SHADOW REGISTER 5
LOAD ENABLE
Match 0
Match 1
PWM1
S
R
Q
SHADOW REGISTER 6
LOAD ENABLE
PWMENA1
EN
PWMSEL2
PWM2
Q
MUX
S
R
Match0
PWMENA2
Match 2
EN
CLEAR
LOAD ENABLE REGISTER
PWMSEL3
MATCH CONTROL REGISTER
PWM3
Q
S
R
MUX
PWMENA3
Match 3
EN
INTERRUPT REGISTER
PWMSEL4
PWM4
Q
MUX
S
R
CONTROL
M[6:0]
=
PWMENA4
Match 4
EN
=
=
INTERRUPT
CAPTURE[1:0]
PWMSEL5
=
PWM5
Q
MUX
S
R
=
STOP ON MATCH
RESET ON MATCH
LOAD[1:0]
=
Match 5
PWMENA5
EN
=
PWMSEL6
CAPTURE CONTROL REGISTER
PWM6
Q
MUX
S
R
CSN
CAPTURE REGISTER 0
CAPTURE REGISTER 1
RESERVED
Match 6
PWMENA6
TIMER COUNTER
CE
EN
RESERVED
TCI
PRESCALE COUNTER
MAXVAL
PWMENA1..6 PWMSEL2..6
PWM CONTROL REGISTER
master
disable
reset
enable
TIMER CONTROL REGISTER
PRESCALE REGISTER
Fig 132. PWM block diagram
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
3.1 Rules for single edge controlled PWM outputs
1. All single edge controlled PWM outputs go high at the beginning of a PWM cycle
unless their match value is equal to 0.
2. Each PWM output will go low when its match value is reached. If no match occurs (i.e.
the match value is greater than the PWM rate), the PWM output remains continuously
high.
3.2 Rules for double edge controlled PWM outputs
Five rules are used to determine the next value of a PWM output when a new cycle is
about to begin:
1. The match values for the next PWM cycle are used at the end of a PWM cycle (a time
point which is coincident with the beginning of the next PWM cycle), except as noted
in rule 3.
2. A match value equal to 0 or the current PWM rate (the same as the Match channel 0
value) have the same effect, except as noted in rule 3. For example, a request for a
falling edge at the beginning of the PWM cycle has the same effect as a request for a
falling edge at the end of a PWM cycle.
3. When match values are changing, if one of the "old" match values is equal to the
PWM rate, it is used again once if the neither of the new match values are equal to 0
or the PWM rate, and there was no old match value equal to 0.
4. If both a set and a clear of a PWM output are requested at the same time, clear takes
precedence. This can occur when the set and clear match values are the same as in,
or when the set or clear value equals 0 and the other value equals the PWM rate.
5. If a match value is out of range (i.e. greater than the PWM rate value), no match event
occurs and that match channel has no effect on the output. This means that the PWM
output will remain always in one state, allowing always low, always high, or
"no change" outputs.
3.3 Summary of differences from the standard timer block
1. A synchronizing register (shadow register) is added to each match register to allow
changes to take effect only when requested by software, and only at the transition
between PWM cycles.
2. A new Load Enable Register (LER) is added to allow software to control Match
register updates. The LER contains one bit for each Match register. When a bit in the
LER is written with a one, the shadow register contents for the corresponding Match
channel are loaded into the actual Match register when the counter is reset (when
Match 0 occurs). LER bits are reset automatically when the counter is reset.
3. A single PWM mode bit is added to the TCR register. The PWM mode enables
loading the actual match registers from the shadow registers under
software/hardware control as described above. When PWM mode is not enabled, the
match value shadow registers are either transparent or bypassed.
4. A Master Enable bit is added to the TCR register, the value of which is brought out of
the PWM block. An external enable input is added to the PWM block, that is
connected to the Master Enable output of the Master PWM block.
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
5. The maximum number of match registers is increased to 7 in order to allow support
for up to 3 double edge PWM channels. This includes the necessary match outputs,
control bits, etc. for each match register:
– Three new Match registers are added, creating Match channels 4 through 6.
– Three additional sets of stop (S), reset (R), and interrupt (I) bits are added to the
MCR register (3 per additional match register).
6. Add PWM outputs to the timer that connect a functional equivalent of an RS Flip-Flop
to two match outputs. A 2-to-1 mux on each PWM output allows selection of either a
single or a double edged PWM. A new register (PCR) is added to hold the control bits
for the muxes (PWMSEL bits).
7. Three interrupt bits are added to the IR register.
double edge controlled PWM outputs via the muxes controlled by the PWMSELn bits. The
implementation of the PWM module supports up to N-1 single edge PWM outputs or
(N-1)/2 double edge PWM outputs, where N is the number of match registers that are
implemented. PWM types can be mixed if desired.For LPC2400 devices N = 7 which
gives up to 6 single edge PWM outputs or up to 3 double edge PWM outputs available at
the same time
PWM2
PWM4
PWM5
1
27
41
53
65
78
100
(counter is reset)
The waveforms below show a single PWM cycle and demonstrate PWM outputs under the
following conditions:
The timer is configured for PWM mode (counter resets to one).
Match 0 is configured to reset the timer/counter when a match event occurs.
Control bits PWMSEL2 and PWMSEL4 are set.
The Match register values are as follows:
MR0 = 100 (PWM rate)
MR1 = 41, MR2 = 78 (PWM2 output)
MR3 = 53, MR4 = 27 (PWM4 output)
MR5 = 65 (PWM5 output)
Fig 133. Sample PWM waveforms
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 554. Set and reset inputs for PWM flip-flops
PWM Channel Single Edge PWM (PWMSELn = 0) Double Edge PWM (PWMSELn = 1)
Set by
Reset by
Match 1
Match 2
Match 3
Match 4
Match 5
Match 6
Set by
Reset by
Match 1[1]
Match 2
1
2
3
4
5
6
Match 0
Match 0
Match 0
Match 0
Match 0
Match 0
Match 0[1]
Match 1
Match 2[2]
Match 3
Match 4[2]
Match 5
Match 3[2]
Match 4
Match 5[2]
Match 6
[1] Identical to single edge mode in this case since Match 0 is the neighboring match register. Essentially,
PWM1 cannot be a double edged output.
[2] It is generally not advantageous to use PWM channels 3 and 5 for double edge PWM outputs because it
would reduce the number of double edge PWM outputs that are possible. Using PWM 2, PWM4, and
PWM6 for double edge PWM outputs provides the most pairings.
4. Pin description
Table 555. Pin summary
Pin
Type
Description
PWM0/1[1]
PWM0/1[2]
PWM0/1[3]
PWM0/1[4]
PWM0/1[5]
PWM0/1[6]
PCAP0[0]
PCAP1[1:0]
Output
Output
Output
Output
Output
Output
Input
Output from PWM channel 1.
Output from PWM channel 2.
Output from PWM channel 3.
Output from PWM channel 4.
Output from PWM channel 5.
Output from PWM channel 6.
Capture Inputs. A transition on a capture pin can be configured to load
the corresponding Capture register with the value of the Timer Counter
and optionally generate an interrupt. PWM0 brings out one capture
input, PWM1 brings out 2 capture inputs.
5. PWM base addresses
Table 556: Addresses for PWM 0 and 1
PWM
Base addresses
0xE001 4000
0xE001 8000
0
1
6. Register description
The PWM0 and PWM1 function adds new registers and registers bits as shown in
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 557. PWM0 and PWM1 register map
Generic Description
Name
Access Reset
PWM0 Address PWM1 Address
& Name
IR
Interrupt Register. The IR can be written to clear
interrupts. The IR can be read to identify which of eight
possible interrupt sources are pending.
R/W
R/W
0
0
0xE001 4000
PWM0IR
0xE001 8000
PWM1IR
TCR
Timer Control Register. The TCR is used to control the
Timer Counter functions. The Timer Counter can be
disabled or reset through the TCR.
0xE001 4004
PWM0TCR
0xE001 8004
PWM1TCR
TC
PR
PC
Timer Counter. The 32 bit TC is incremented every PR+1 R/W
cycles of PCLK. The TC is controlled through the TCR.
0
0
0
0xE001 4008
PWM0TC
0xE001 8008
PWM1TC
Prescale Register. The TC is incremented every PR+1
cycles of PCLK.
R/W
0xE001 400C
PWM0PR
0xE001 800C
PWM1PR
Prescale Counter. The 32 bit PC is a counter which is
incremented to the value stored in PR. When the value in
PR is reached, the TC is incremented. The PC is
observable and controllable through the bus interface.
R/W
0xE000 4010
PWM0PC
0xE001 8010
PWM1PC
MCR
MR0
Match Control Register. The MCR is used to control if an R/W
interrupt is generated and if the TC is reset when a Match
occurs.
0
0
0xE001 4014
PWM0MCR
0xE001 8014
PWM0MCR
Match Register 0. MR0 can be enabled in the MCR to
reset the TC, stop both the TC and PC, and/or generate
an interrupt when it matches the TC. In addition, a match
between this value and the TC sets any PWM output that
is in single-edge mode, and sets PWM1 if it’s in
double-edge mode.
R/W
0xE001 4018
PWM0MR0
0xE001 8018
PWM1MR0
MR1
MR2
MR3
CCR
Match Register 1. MR1 can be enabled in the MCR to
reset the TC, stop both the TC and PC, and/or generate
an interrupt when it matches the TC. In addition, a match
between this value and the TC clears PWM1 in either
edge mode, and sets PWM2 if it’s in double-edge mode.
R/W
R/W
R/W
0
0
0
0
0xE001 401C
PWM0MR1
0xE001 801C
PWM1MR1
Match Register 2. MR2 can be enabled in the MCR to
reset the TC, stop both the TC and PC, and/or generate
an interrupt when it matches the TC. In addition, a match
between this value and the TC clears PWM2 in either
edge mode, and sets PWM3 if it’s in double-edge mode.
0xE001 4020
PWM0MR2
0xE001 8020
PWM1MR2
Match Register 3. MR3 can be enabled in the MCR to
reset the TC, stop both the TC and PC, and/or generate
an interrupt when it matches the TC. In addition, a match
between this value and the TC clears PWM3 in either
edge mode, and sets PWM4 if it’s in double-edge mode.
0xE001 4024
PWM0MR3
0xE001 8024
PWM1MR3
Capture Control Register. The CCR controls which edges R/W
of the capture inputs are used to load the Capture
Registers and whether or not an interrupt is generated
when a capture takes place.
0xE001 4028
PWM0CCR
0xE001 8028
PWM1CCR
CR0
CR1
Capture Register 0. PWMn CR0 is loaded with the value RO
of the TC when there is an event on the CAPn.0 input.
0
0
0xE001 402C
PWM0CR0
-
Capture Register 1. See CR0 description.
RO
0xE001 4030
PWM0CR1
0xE001 8030
PWM1CR1
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 557. PWM0 and PWM1 register map
Generic Description
Name
Access Reset
PWM0 Address PWM1 Address
Value[1] & Name
& Name
MR4
MR5
MR6
PCR
Match Register 4. MR4 can be enabled in the MCR to
reset the TC, stop both the TC and PC, and/or generate
an interrupt when it matches the TC. In addition, a match
between this value and the TC clears PWM4 in either
edge mode, and sets PWM5 if it’s in double-edge mode.
R/W
R/W
R/W
R/W
0
0
0
0
0xE001 4040
PWM0MR
0xE001 8040
PWM1MR
Match Register 5. MR5 can be enabled in the MCR to
reset the TC, stop both the TC and PC, and/or generate
an interrupt when it matches the TC. In addition, a match
between this value and the TC clears PWM5 in either
edge mode, and sets PWM6 if it’s in double-edge mode.
0xE001 4044
PWM0MR
0xE001 8044
PWM1MR
Match Register 6. MR6 can be enabled in the MCR to
reset the TC, stop both the TC and PC, and/or generate
an interrupt when it matches the TC. In addition, a match
between this value and the TC clears PWM6 in either
edge mode.
0xE001 4048
PWM0MR
0xE001 8048
PWM1MR
PWM Control Register. Enables PWM outputs and
selects PWM channel types as either single edge or
double edge controlled.
0xE001 404C
PWM0PCR
0xE001 804C
PWM1PCR
LER
Load Enable Register. Enables use of new PWM match
values.
R/W
R/W
0
0
0xE001 4050
PWM0LER
0xE001 8050
PWM1LER
CTCR
Count Control Register. The CTCR selects between
Timer and Counter mode, and in Counter mode selects
the signal and edge(s) for counting.
0xE001 4070
PWM0CTCR
0xE001 8070
PWM1CTCR
[1] Reset Value relects the data stored in used bits only. It does not include reserved bits content.
6.1 PWM Interrupt Register (PWM0IR - 0xE001 4000 and PWM1IR
0xE001 8000)
interrupts and four reserved. If an interrupt is generated then the corresponding bit in the
PWMIR will be high. Otherwise, the bit will be low. Writing a logic one to the corresponding
IR bit will reset the interrupt. Writing a zero has no effect.
Table 558: PWM Interrupt Register (PWM0IR - address 0xE001 4000 and PWM1IR address
0xE001 8000) bit description
Bit
Symbol
Description
Reset
Value
0
1
2
3
4
PWMMR0 Interrupt Interrupt flag for PWM match channel 0.
PWMMR1 Interrupt Interrupt flag for PWM match channel 1.
PWMMR2 Interrupt Interrupt flag for PWM match channel 2.
PWMMR3 Interrupt Interrupt flag for PWM match channel 3.
0
0
0
0
0
PWMCAP0
Interrupt
Interrupt flag for capture input 0
5
PWMCAP1
Interrupt
Interrupt flag for capture input 1 (available in PWM1IR only;
this bit is reserved in PWM0IR).
0
-
7:6
8
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
PWMMR4 Interrupt Interrupt flag for PWM match channel 4.
0
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 558: PWM Interrupt Register (PWM0IR - address 0xE001 4000 and PWM1IR address
0xE001 8000) bit description
Bit
Symbol
Description
Reset
Value
9
PWMMR5 Interrupt Interrupt flag for PWM match channel 5.
PWMMR6 Interrupt Interrupt flag for PWM match channel 6.
0
10
0
15:11 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.2 PWM Timer Control Register (PWM0TCR - 0xE001 4004 and
PWM1TCR 0xE001 8004)
The PWM Timer Control Register (PWMTCR) is used to control the operation of the PWM
Table 559: PWM Timer Control Register (PWM0TCR - address 0xE001 4004 PWM1TCR address 0xE001 8004) bit
description
Bit
Symbol
Value
Description
Reset
Value
0
Counter Enable 1
0
The PWM Timer Counter and PWM Prescale Counter are
enabled for counting.
0
The counters are disabled.
1
Counter Reset
1
The PWM Timer Counter and the PWM Prescale Counter
are synchronously reset on the next positive edge of PCLK.
The counters remain reset until this bit is returned to zero.
0
0
Clear reset.
2
3
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
0
PWM Enable
1
PWM mode is enabled (counter resets to 1). PWM mode
causes the shadow registers to operate in connection with
the Match registers. A program write to a Match register will
not have an effect on the Match result until the
corresponding bit in PWMLER has been set, followed by the
occurrence of a PWM Match 0 event. Note that the PWM
Match register that determines the PWM rate (PWM Match
Register 0 - MR0) must be set up prior to the PWM being
enabled. Otherwise a Match event will not occur to cause
shadow register contents to become effective.
0
Timer mode is enabled (counter resets to 0).
4
Master Disable
(PWM0 only)
The two PWMs may be synchronized using the Master
Disable control bit. The Master disable bit of the Master
PWM (PWM0 module) controls a secondary enable input to
0
This bit has no function in the Slave PWM (PWM1).
1
0
PWM0 is the master, and both PWMs are enabled for
counting.
The PWM’s are used independently, and the individual
Counter Enable bits are used to control the PWM’s.
7:5
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
6.3 PWM Count Control Register (PWM0CTCR - 0xE001 4070 and
PWM1CTCR 0xE001 8070)
The Count Control Register (CTCR) is used to select between Timer and Counter mode,
and in Counter mode to select the pin and edge(s) for counting. The function of each of
Table 560: PWM Count control Register (PWM0TCR - address 0xE001 4004 and PWM1CTCR
address 0xE001 8004) bit description
Bit
Symbol
Description
Reset Value
1:0
Counter/
Timer Mode
00: Timer Mode: the TC is incremented when the
Prescale Counter matches the Prescale register.
00
01: Counter Mode: the TC is incremented on rising
edges of the PCAP input selected by bits 3:2.
10: Counter Mode: the TC is incremented on falling
edges of the PCAP input selected by bits 3:2.
11: Counter Mode: the TC is incremented on both edges
of the PCAP input selected by bits 3:2.
3:2
7:4
Count Input
Select
When bits 1:0 are not 00, these bits select which PCAP 00
pin carries the signal used to increment the TC.
For PWM0: 00 = PCAP0.0 (Other combinations are
reserved)
For PWM1: 00 = PCAP1.0, 01 = PCAP1.1(Other
combinations are reserved)
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
[1] PCAP input signal frequency must not exceed PCLK/4. When the PWM clock is supplied via the PCAP pin,
at no time high(low) level of the signal on this pin can last less than 1/(2×PCLK).
6.4 PWM Match Control Register (PWM0MCR - 0xE001 4014 and
PWM1MCR 0xE001 8014)
The PWM Match Control registers are used to control what operations are performed
when one of the PWM Match registers matches the PWM Timer Counter. The function of
Table 561: Match Control Register (PWM0MCR - address 0xE000 4014 and PWM1MCR -
address 0xE000 8014) bit description
Bit
Symbol
Value Description
Reset
Value
0
PWMMR0I
1
0
Interrupt on PWMMR0: an interrupt is generated when
PWMMR0 matches the value in the PWMTC.
0
0
0
This interrupt is disabled.
1
2
PWMMR0R 1
Reset on PWMMR0: the PWMTC will be reset if PWMMR0
matches it.
0
This feature is disabled.
PWMMR0S 1
Stop on PWMMR0: the PWMTC and PWMPC will be stopped
and PWMTCR bt 0 will be set to 0 if PWMMR0 matches the
PWMTC.
0
This feature is disabled
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 561: Match Control Register (PWM0MCR - address 0xE000 4014 and PWM1MCR -
address 0xE000 8014) bit description
Bit
Symbol
Value Description
Reset
Value
3
PWMMR1I
1
0
Interrupt on PWMMR1: an interrupt is generated when
PWMMR1 matches the value in the PWMTC.
0
0
0
This interrupt is disabled.
4
5
PWMMR1R 1
Reset on PWMMR1: the PWMTC will be reset if PWMMR1
matches it.
0
This feature is disabled.
PWMMR1S 1
Stop on PWMMR1: the PWMTC and PWMPC will be stopped
and PWMTCR bit 0 will be set to 0 if PWMMR1 matches the
PWMTC.
0
This feature is disabled.
6
7
8
PWMMR2I
1
Interrupt on PWMMR2: an interrupt is generated when
PWMMR2 matches the value in the PWMTC.
0
0
0
0
This interrupt is disabled.
PWMMR2R 1
Reset on PWMMR2: the PWxMTC will be reset if PWMMR2
matches it.
0
This feature is disabled.
PWMMR2S 1
Stop on PWMMR2: the PWMTC and PWMPC will be stopped
and PWMTCR bit 0 will be set to 0 if PWMMR2 matches the
PWxMTC.
0
This feature is disabled
9
PWMMR3I
1
Interrupt on PWMMR3: an interrupt is generated when
PWMMR3 matches the value in the PWMTC.
0
0
0
0
This interrupt is disabled.
10
11
PWMMR3R 1
Reset on PWMMR3: the PWMTC will be reset if PWMMR3
matches it.
0
This feature is disabled
PWMMR3S 1
Stop on PWMMR3: The PWMTC and PWMPC will be
stopped and PWMTCR bit 0 will be set to 0 if PWMMR3
matches the PWMTC.
0
This feature is disabled
12
13
14
PWMMR4I
1
Interrupt on PWMMR4: An interrupt is generated when
PWMMR4 matches the value in the PWMTC.
0
0
0
0
This interrupt is disabled.
PWMMR4R 1
Reset on PWMMR4: the PWMTC will be reset if PWMMR4
matches it.
0
This feature is disabled.
PWMMR4S 1
Stop on PWMMR4: the PWMTC and PWMPC will be stopped
and PWMTCR[0] will be set to 0 if PWMMR4 matches the
PWMTC.
0
This feature is disabled
15
PWMMR5I
1
Interrupt on PWMMR5: An interrupt is generated when
PWMMR5 matches the value in the PWMTC.
0
0
This interrupt is disabled.
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 561: Match Control Register (PWM0MCR - address 0xE000 4014 and PWM1MCR -
address 0xE000 8014) bit description
Bit
Symbol
Value Description
Reset
Value
16
PWMMR5R 1
Reset on PWMMR5: the PWMTC will be reset if PWMMR5
matches it.
0
0
This feature is disabled.
17
PWMMR5S 1
Stop on PWMMR5: the PWMTC and PWMPC will be stopped
and PWMTCR[0] will be set to 0 if PWMMR5 matches the
PWMTC.
0
0
This feature is disabled
18
19
20
PWMMR6I
1
Interrupt on PWMMR6: an interrupt is generated when
PWMMR6 matches the value in the PWMTC.
0
0
0
0
This interrupt is disabled.
PWMMR6R 1
Reset on PWMMR6: the PWMTC will be reset if PWMMR6
matches it.
0
This feature is disabled.
PWMMR6S 1
Stop on PWMMR6: the PWMTC and PWMPC will be stopped
and PWMTCR[0] will be set to 0 if PWMMR6 matches the
PWMTC.
0
This feature is disabled
31:21 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.5 PWM Capture Control Register (PWM0CCR - 0xE001 4028 and
PWM1CCR 0xE001 8028)
The Capture Control register is used to control whether any of the Capture registers is
loaded with the value in the Timer Counter when a capture event occurs on PCAP0[0] or
PCAP1[1:0], and whether an interrupt is generated by the capture event. Setting both the
rising and falling bits at the same time is a valid configuration, resulting in a capture event
for both edges. In the descriptions below, “n” represents the Timer number, 0 or 1.
Note: If Counter mode is selected for a particular PCAP input in the CTCR, the 3 bits for
that input in this register should be programmed as 000, but capture and/or interrupt can
be selected for the other two PCAP inputs.
Table 562: PWM Capture Control Register (PWM0CCR - address 0xE001 4028 and PWM1CCR
address 0xE001 8028) bit description
Bit Symbol
Value Description
Reset
Value
0
1
2
Capture on
PCAPn.0
rising edge
0
1
This feature is disabled.
0
0
0
A synchronously sampled rising edge on the PCAPn.0 input
will cause CR0 to be loaded with the contents of the TC.
Capture on
PCAPn.0
falling edge
0
1
This feature is disabled.
A synchronously sampled falling edge on PCAPn.0 will cause
CR0 to be loaded with the contents of TC.
Interrupt on
PCAPn.0
event
0
1
This feature is disabled.
A CR0 load due to a PCAPn.0 event will generate an
interrupt.
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 562: PWM Capture Control Register (PWM0CCR - address 0xE001 4028 and PWM1CCR
address 0xE001 8028) bit description
Bit Symbol
Value Description
Reset
Value
3
4
5
Capture on
PCAPn.1
rising edge[1]
0
1
This feature is disabled.
0
A synchronously sampled rising edge on the PCAPn.1 input
will cause CR1 to be loaded with the contents of the TC.
Capture on
PCAPn.1
falling edge[1]
0
1
This feature is disabled.
0
A synchronously sampled falling edge on PCAPn.1 will cause
CR1 to be loaded with the contents of TC.
Interrupt on
PCAPn.1
event[1]
0
1
This feature is disabled.
0
A CR1 load due to a PCAPn.1 event will generate an
interrupt.
31:6 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
[1] Reserved for PWM0.
6.6 PWM Control Registers (PWM0PCR - 0xE001 404C and PWM1PCR
0xE001 804C)
The PWM Control registers are used to enable and select the type of each PWM channel.
Table 563: PWM Control Registers (PWMPCR - address 0xE001 404C and PWM1PCR
address 0xE001 804C) bit description
Bit
Symbol
Value Description
Reset
Value
1:0
2
Unused
Unused, always zero.
NA
0
PWMSEL2
PWM2 output single/double edge mode control.
Double edge controlled mode is selected.
1
0
1
1
1
1
Single edge controlled mode is selected.
3
PWMSEL3
PWMSEL4
PWMSEL5
PWMSEL6
-
PWM3 output edge control. See PWMSEL2 for details.
PWM4 output edge control. See PWMSEL2 for details.
PWM5 output edge control. See PWMSEL2 for details.
PWM6 output edge control. See PWMSEL2 for details.
0
4
0
5
0
6
0
8:7
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
9
PWMENA1
The PWM1 output enable control.
The PWM output is disabled.
The PWM output is enabled.
0
0
1
10
11
12
13
14
PWMENA2
PWMENA3
PWMENA4
PWMENA5
PWMENA6
The PWM2 output enable control. See PWMENA1 for details. 0
The PWM3 output enable control. See PWMENA1 for details. 0
The PWM4 output enable control. See PWMENA1 for details. 0
The PWM5 output enable control. See PWMENA1 for details. 0
The PWM6 output enable control. See PWMENA1 for details. 0
31:15 Unused
Unused, always zero.
NA
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
6.7 PWM Latch Enable Register (PWM0LER - 0xE001 4050 and PWM1LER
0xE001 8050)
The PWM Latch Enable registers are used to control the update of the PWM Match
registers when they are used for PWM generation. When software writes to the location of
a PWM Match register while the Timer is in PWM mode, the value is actually held in a
shadow register and not used immediately.
When a PWM Match 0 event occurs (normally also resetting the timer in PWM mode), the
contents of shadow registers will be transferred to the actual Match registers if the
corresponding bit in the Latch Enable register has been set. At that point, the new values
will take effect and determine the course of the next PWM cycle. Once the transfer of new
values has taken place, all bits of the LER are automatically cleared. Until the
corresponding bit in the PWMLER is set and a PWM Match 0 event occurs, any value
written to the PWM Match registers has no effect on PWM operation.
For example, if PWM is configured for double edge operation and is currently running, a
typical sequence of events for changing the timing would be:
• Write a new value to the PWM Match1 register.
• Write a new value to the PWM Match2 register.
• Write to the PWMLER, setting bits 1 and 2 at the same time.
• The altered values will become effective at the next reset of the timer (when a PWM
Match 0 event occurs).
The order of writing the two PWM Match registers is not important, since neither value will
be used until after the write to PWMLER. This insures that both values go into effect at the
same time, if that is required. A single value may be altered in the same way if needed.
Table 564: PWM Latch Enable Register (PWM0LER - address 0xE001 4050 and PWM1LER
address 0xE001 8050) bit description
Bit Symbol
Description
Reset
Value
0
Enable PWM
PWM MR0 register update control. Writing a one to this bit allows
Match 0 Latch the last value written to the PWM Match Register 0 to be become
effective when the timer is next reset by a PWM Match event. See
0
1
2
3
4
Enable PWM
Match 1 Latch
PWM MR1 register update control. See bit 0 for details.
PWM MR2 register update control. See bit 0 for details.
PWM MR3 register update control. See bit 0 for details.
PWM MR4 register update control. See bit 0 for details.
0
0
0
0
Enable PWM
Match 2 Latch
Enable PWM
Match 3 Latch
Enable PWM
Match 4 Latch
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Chapter 25: LPC24XX Pulse Width Modulator PWM0/PWM1
Table 564: PWM Latch Enable Register (PWM0LER - address 0xE001 4050 and PWM1LER
address 0xE001 8050) bit description
Bit Symbol
Description
Reset
Value
5
6
7
Enable PWM
Match 5 Latch
PWM MR5 register update control. See bit 0 for details.
PWM MR6 register update control. See bit 0 for details.
0
Enable PWM
Match 6 Latch
0
-
Reserved, user software should not write ones to reserved bits. The NA
value read from a reserved bit is not defined.
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Chapter 26: LPC24XX Real-Time Clock (RTC) and battery RAM
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User manual
1. Basic configuration
The RTC is configured using the following registers:
2. Features
• Measures the passage of time to maintain a calendar and clock.
• Ultra Low Power design to support battery powered systems.
• Provides Seconds, Minutes, Hours, Day of Month, Month, Year, Day of Week, and
Day of Year.
• Dedicated 32 kHz oscillator or programmable prescaler from APB clock.
• Dedicated power supply pin can be connected to a battery or to the main 3.3 V.
• An alarm output pin is included to assist in waking up from Power-down mode or
when the chip has had power removed to all functions except the RTC and Battery
RAM.
• Periodic interrupts can be generated from increments of any field of the time registers,
and selected fractional second values.
• 2 kilobyte static RAM powered by VBAT.
• RTC and Battery RAM power supply is isolated from the rest of the chip.
3. Description
The Real-Time Clock (RTC) is a set of counters for measuring time when system power is
on, and optionally when it is off. It uses little power in power down mode. On the
LPC2400, the RTC can be clocked by a separate 32.768 KHz oscillator or by a
programmable prescale divider based on the APB clock. The RTC is powered by its own
power supply pin, VBAT, which can be connected to a battery or to the same 3.3 V supply
used by the rest of the device.
The VBAT pin supplies power only to the RTC and the Battery RAM. These two functions
require a minimum of power to operate, which can be supplied by an external battery.
When the CPU and the rest of chip functions are stopped and power removed, the RTC
can supply an alarm output that can be used by external hardware to restore chip power
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Chapter 26: LPC24XX Real-Time Clock (RTC) and battery RAM
and resume operation. The alarm output has a nominal voltage swing of 1.8 V. Note that
start-up procedure.
4. Architecture
RTC OSCILLATOR
CLK32k
MUX
CLOCK GENERATOR
REFERENCE CLOCK DIVIDER
(PRESCALER)
strobe
CLK1
CCLK
ALARM
REGISTERS
TIME COUNTERS
COMPARATORS
COUNTER INCREMENT
INTERRUPT ENABLE
ALARM MASK
REGISTER
counter
enables
INTERRUPT GENERATOR
Fig 134. RTC block diagram
5. Pin description
Table 565. RTC pin description
Name
Type
Description
ALARM
RTCX1
RTCX2
O
I
Input to the RTC oscillator circuit.
O
Output from the RTC oscillator circuit.
Remark: If the RTC is not used, the RTCX1/2 pins can be left
floating.
VBAT
I
RTC power supply: 3.3 V on this pin supplies the power to the
RTC.
Remark: If the RTC is used, VBAT must be connected to either pin
VDD(3V3) or an independent power supply (external battery).
Otherwise, VBAT should be left floating.
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Chapter 26: LPC24XX Real-Time Clock (RTC) and battery RAM
6. Register description
The RTC includes a number of registers. The address space is split into four sections by
functionality. The first eight addresses are the Miscellaneous Register Group
of the registers follow. In these descriptions, for most of the registers the Reset Value
column shows "NC", meaning that these registers are not changed by a Reset. Software
must initialize these registers between power-on and setting the RTC into operation.
Table 566. Summary of Real-Time Clock registers
Name
Size Description
Access Reset
Value[1]
Address
ILR
2
Interrupt Location Register
R/W
RO
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
0xE002 4000
0xE002 4004
0xE002 4008
0xE002 400C
0xE002 4010
0xE002 4014
0xE002 4018
0xE002 401C
0xE002 4020
0xE002 4024
0xE002 4028
0xE002 402C
0xE002 4030
0xE002 4034
0xE002 4038
0xE002 403C
0xE002 4040
CTC
15
4
Clock Tick Counter
CCR
Clock Control Register
Counter Increment Interrupt Register
Alarm Mask Register
Consolidated Time Register 0
Consolidated Time Register 1
Consolidated Time Register 2
Seconds Counter
R/W
R/W
R/W
RO
CIIR
8
AMR
8
CTIME0
CTIME1
CTIME2
SEC
32
32
32
6
RO
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
MIN
6
Minutes Register
HOUR
DOM
DOW
DOY
5
Hours Register
5
Day of Month Register
Day of Week Register
Day of Year Register
Months Register
3
9
MONTH
YEAR
CISS
4
12
8
Years Register
Counter Increment select mask for
Sub-Second interrupt
ALSEC
ALMIN
6
Alarm value for Seconds
Alarm value for Minutes
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
NC
NC
NC
NC
NC
NC
NC
NC
0
0xE002 4060
0xE002 4064
0xE002 4068
0xE002 406C
0xE002 4070
0xE002 4074
0xE002 4078
0xE002 407C
0xE002 4080
0xE002 4084
6
ALHOUR
ALDOM
ALDOW
ALDOY
ALMON
ALYEAR
PREINT
5
Alarm value for Seconds
Alarm value for Day of Month
Alarm value for Day of Week
Alarm value for Day of Year
Alarm value for Months
5
3
9
4
12
13
Alarm value for Year
Prescaler value, integer portion
Prescaler value, fractional portion
PREFRAC 15
0
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[1] Registers in the RTC other than those that are part of the Prescaler are not affected by chip Reset. These
registers must be initialized by software if the RTC is enabled. Reset Value reflects the data stored in used
bits only. It does not include reserved bits content.
6.1 RTC interrupts
Interrupt generation is controlled through the Interrupt Location Register (ILR), Counter
Increment Interrupt Register (CIIR), the alarm registers, and the Alarm Mask Register
(AMR). Interrupts are generated only by the transition into the interrupt state. The ILR
separately enables CIIR and AMR interrupts. Each bit in CIIR corresponds to one of the
time counters. If CIIR is enabled for a particular counter, then every time the counter is
incremented an interrupt is generated. The alarm registers allow the user to specify a date
and time for an interrupt to be generated. The AMR provides a mechanism to mask alarm
compares. If all nonmasked alarm registers match the value in their corresponding time
counter, then an interrupt is generated.
The RTC interrupt can bring the microcontroller out of power-down mode if the RTC is
operating from its own oscillator on the RTCX1-2 pins. When the RTC interrupt is enabled
for wakeup and its selected event occurs, the oscillator wakeup cycle associated with the
XTAL1/2 pins is started. For details on the RTC based wakeup process see Section
6.2 Miscellaneous register group
descriptions follow.
Table 567. Miscellaneous registers
Name
Size Description
Access Address
ILR
3
Interrupt Location. Reading this location indicates
R/W
0xE002 4000
the source of an interrupt. Writing a one to the
appropriate bit at this location clears the associated
interrupt.
CTC
CCR
15
4
Clock Tick Counter. Value from the clock divider.
RO
0xE002 4004
0xE002 4008
Clock Control Register. Controls the function of the R/W
clock divider.
CIIR
8
8
Counter Increment Interrupt. Selects which counters R/W
will generate an interrupt when they are
incremented.
0xE002 400C
0xE002 4010
AMR
Alarm Mask Register. Controls which of the alarm
registers are masked.
R/W
CTIME0
CTIME1
CTIME2
32
32
32
Consolidated Time Register 0
Consolidated Time Register 1
Consolidated Time Register 2
RO
RO
RO
0xE002 4014
0xE002 4018
0xE002 401C
6.2.1 Interrupt Location Register (ILR - 0xE002 4000)
The Interrupt Location Register is a 2 bit register that specifies which blocks are
corresponding interrupt. Writing a zero has no effect. This allows the programmer to read
this register and write back the same value to clear only the interrupt that is detected by
the read.
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Table 568. Interrupt Location Register (ILR - address 0xE002 4000) bit description
Bit
Symbol Description
Reset
value
0
RTCCIF When one, the Counter Increment Interrupt block generated an interrupt. NC
Writing a one to this bit location clears the counter increment interrupt.
1
RTCALF When one, the alarm registers generated an interrupt. Writing a one to NC
this bit location clears the alarm interrupt.
2
RTSSF
When one, the Counter Increment Sub-Seconds interrupt is generated. NC
The interrupt rate is determined by the CISS register.
7:2
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
6.2.2 Clock Tick Counter Register (CTCR - 0xE002 4004)
The Clock Tick Counter is read only. It can be reset to zero through the Clock Control
Register (CCR). The CTC consists of the bits of the clock divider counter.
Table 569. Clock Tick Counter Register (CTCR - address 0xE002 4004) bit description
Bit
Symbol
Description
Reset
value
0
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
15:1 Clock Tick Prior to the Seconds counter, the CTC counts 32,768 clocks per
NA
Counter
second. Due to the RTC Prescaler, these 32,768 time increments may
not all be of the same duration. Refer to the Section 26–10.1
“Reference Clock Divider (Prescaler)” on page 657 for details.
If the RTC is driven by the external 32.786 kHz oscillator, subsequent read operations of
the CTCR may yield an incorrect result. The CTCR is implemented as a 15-bit ripple
counter so that not all 15 bits change simultaneously. The LSB changes first, then the
next, and so forth. Since the 32.786 kHz oscillator is asynchronous to the CPU clock, it is
possible for a CTC read to occur during the time when the CTCR bits are changing
resulting in an incorrect large difference between back-to-back reads.
If the RTC is driven by the PCLK, the CPU and the RTC are synchronous because both of
their clocks are driven from the PLL output. Therefore, incorrect consecutive reads can
not occur.
6.2.3 Clock Control Register (CCR - 0xE002 4008)
The clock register is a 4 bit register that controls the operation of the clock divide circuit.
Table 570. Clock Control Register (CCR - address 0xE002 4008) bit description
Bit
Symbol
Description
Reset
value
0
CLKEN
Clock Enable. When this bit is a one the time counters are enabled.
When it is a zero, they are disabled so that they may be initialized.
NA
1
CTCRST CTC Reset. When one, the elements in the Clock Tick Counter are
reset. The elements remain reset until CCR[1] is changed to zero.
NA
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Table 570. Clock Control Register (CCR - address 0xE002 4008) bit description
Bit
3:2
4
Symbol
Description
Reset
value
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
CLKSRC If this bit is 0, the Clock Tick Counter takes its clock from the Prescaler, NA
as on earlier devices in the NXP Embedded ARM family. If this bit is 1,
the CTC takes its clock from the 32 kHz oscillator that’s connected to
the RTCX1 and RTCX2 pins (see Section 26–12 “RTC external 32 kHz
oscillator component selection” for hardware details).
7:5
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
6.2.4 Counter Increment Interrupt Register (CIIR - 0xE002 400C)
The Counter Increment Interrupt Register (CIIR) gives the ability to generate an interrupt
every time a counter is incremented. This interrupt remains valid until cleared by writing a
one to bit zero of the Interrupt Location Register (ILR[0]).
Table 571. Counter Increment Interrupt Register (CIIR - address 0xE002 400C) bit description
Bit
Symbol
Description
Reset
value
0
1
2
3
IMSEC
IMMIN
When 1, an increment of the Second value generates an interrupt.
When 1, an increment of the Minute value generates an interrupt.
NA
NA
NA
NA
IMHOUR When 1, an increment of the Hour value generates an interrupt.
IMDOM
When 1, an increment of the Day of Month value generates an
interrupt.
4
5
6
7
IMDOW
IMDOY
IMMON
When 1, an increment of the Day of Week value generates an interrupt. NA
When 1, an increment of the Day of Year value generates an interrupt. NA
When 1, an increment of the Month value generates an interrupt.
NA
NA
IMYEAR When 1, an increment of the Year value generates an interrupt.
6.2.5 Counter Increment Select Mask Register (CISS - 0xE002 4040)
The CISS register provides a way to obtain millisecond-range periodic CPU interrupts
from the Real Time Clock. This can allow freeing up one of the general purpose timers, or
support power saving by putting the CPU into a reduced power mode between periodic
interrupts.
Carry out signals from different stages of the Clock Tick Counter are used to generate the
sub-second interrupts. The possibilities range from 16 counts of the CTC (about
488 microseconds), up to 2,048 counts of the CTC (about 62.5 milliseconds). The
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Table 572. Counter Increment Select Mask register (CISS - address 0xE002 4040) bit description
Bit Symbol
Value Description
Reset
value
2:0 SubSecSel
SubSecSelSub-Second Select. This field selects a count for the sub-second interrupt as NC
follows:
000
001
010
011
100
101
110
111
An interrupt is generated on every 16 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 488 microseconds.
An interrupt is generated on every 32 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 977 microseconds.
An interrupt is generated on every 64 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 1.95 milliseconds.
An interrupt is generated on every 128 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 3.9 milliseconds.
An interrupt is generated on every 256 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 7.8 milliseconds.
An interrupt is generated on every 512 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 15.6 milliseconds.
An interrupt is generated on every 1024 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 31.25 milliseconds.
An interrupt is generated on every 2048 counts of the Clock Tick Counter. At 32.768 kHz,
this generates an interrupt approximately every 62.5 milliseconds.
6:3 Unused
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
NC
7
SubSecEna
Subsecond interrupt enable.
0
1
The sub-second interrupt is disabled.
The sub-second interrupt is enabled.
6.2.6 Alarm Mask Register (AMR - 0xE002 4010)
The Alarm Mask Register (AMR) allows the user to mask any of the alarm registers.
alarm function, every non-masked alarm register must match the corresponding time
counter for an interrupt to be generated. The interrupt is generated only when the counter
comparison first changes from no match to match. The interrupt is removed when a one is
written to the appropriate bit of the Interrupt Location Register (ILR). If all mask bits are
set, then the alarm is disabled.
Table 573. Alarm Mask Register (AMR - address 0xE002 4010) bit description
Bit
Symbol
Description
Reset
value
0
1
2
3
4
5
6
7
AMRSEC
AMRMIN
When 1, the Second value is not compared for the alarm.
When 1, the Minutes value is not compared for the alarm.
NA
NA
NA
NA
NA
NA
NA
NA
AMRHOUR When 1, the Hour value is not compared for the alarm.
AMRDOM When 1, the Day of Month value is not compared for the alarm.
AMRDOW When 1, the Day of Week value is not compared for the alarm.
AMRDOY
When 1, the Day of Year value is not compared for the alarm.
AMRMON When 1, the Month value is not compared for the alarm.
AMRYEAR When 1, the Year value is not compared for the alarm.
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6.3 Consolidated time registers
The values of the Time Counters can optionally be read in a consolidated format which
allows the programmer to read all time counters with only three read operations. The
24.
The Consolidated Time Registers are read only. To write new values to the Time
Counters, the Time Counter addresses should be used.
6.3.1 Consolidated Time Register 0 (CTIME0 - 0xE002 4014)
The Consolidated Time Register 0 contains the low order time values: Seconds, Minutes,
Hours, and Day of Week.
Table 574. Consolidated Time register 0 (CTIME0 - address 0xE002 4014) bit description
Bit
Symbol
Description
Reset
value
5:0
7:6
Seconds
-
Seconds value in the range of 0 to 59
NA
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
13:8
Minutes
-
Minutes value in the range of 0 to 59
NA
15:14
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
20:16
23:21
Hours
-
Hours value in the range of 0 to 23
NA
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
26:24
31:27
Day Of Week Day of week value in the range of 0 to 6
NA
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.3.2 Consolidated Time Register 1 (CTIME1 - 0xE002 4018)
The Consolidate Time Register 1 contains the Day of Month, Month, and Year values.
Table 575. Consolidated Time register 1 (CTIME1 - address 0xE002 4018) bit description
Bit
4:0
7:5
Symbol
Description
Reset
value
Day of Month Day of month value in the range of 1 to 28, 29, 30, or 31
(depending on the month and whether it is a leap year).
NA
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
11:8
Month
-
Month value in the range of 1 to 12.
NA
15:12
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
27:16
31:28
Year
-
Year value in the range of 0 to 4095.
NA
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.3.3 Consolidated Time Register 2 (CTIME2 - 0xE002 401C)
The Consolidate Time Register 2 contains just the Day of Year value.
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Table 576. Consolidated Time register 2 (CTIME2 - address 0xE002 401C) bit description
Bit
Symbol
Description
Reset
value
11:0
Day of Year
-
Day of year value in the range of 1 to 365 (366 for leap years).
NA
31:12
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.4 Time Counter Group
Table 577. Time Counter relationships and values)
Counter
Size Enabled by
Minimum value
Maximum value
Second
6
Clk1 (see
0
59
Minute
6
Second
0
0
1
0
1
1
0
59
Hour
5
Minute
23
Day of Month
Day of Week
Day of Year
Month
5
Hour
28, 29, 30 or 31
3
Hour
6
9
Hour
365 or 366 (for leap year)
4
Day of Month
Month or day of Year
12
Year
12
4095
Table 578. Time Counter registers
Name
SEC
Size Description
Access
R/W
Address
6
6
5
5
Seconds value in the range of 0 to 59
Minutes value in the range of 0 to 59
Hours value in the range of 0 to 23
0xE002 4020
0xE002 4024
0xE002 4028
0xE002 402C
MIN
R/W
HOUR
DOM
R/W
Day of month value in the range of 1 to 28, 29, 30, R/W
or 31 (depending on the month and whether it is a
leap year).[1]
DOW
DOY
3
9
Day of week value in the range of 0 to 6[1]
R/W
0xE002 4030
0xE002 4034
Day of year value in the range of 1 to 365 (366 for R/W
leap years)[1]
MONTH
YEAR
4
Month value in the range of 1 to 12
Year value in the range of 0 to 4095
R/W
R/W
0xE002 4038
0xE002 403C
12
[1] These values are simply incremented at the appropriate intervals and reset at the defined overflow point.
They are not calculated and must be correctly initialized in order to be meaningful.
6.4.1 Leap year calculation
The RTC does a simple bit comparison to see if the two lowest order bits of the year
counter are zero. If true, then the RTC considers that year a leap year. The RTC considers
all years evenly divisible by 4 as leap years. This algorithm is accurate from the year 1901
through the year 2099, but fails for the year 2100, which is not a leap year. The only effect
of leap year on the RTC is to alter the length of the month of February for the month, day
of month, and year counters.
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7. Alarm register group
compared with the time counters. If all the unmasked (See Section 26–6.2.6 “Alarm Mask
Register (AMR - 0xE002 4010)” on page 653) alarm registers match their corresponding
time counters then an interrupt is generated. The interrupt is cleared when a one is written
to bit one of the Interrupt Location Register (ILR[1]).
Table 579. Alarm registers
Name
Size Description
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Address
ALSEC
ALMIN
6
Alarm value for Seconds
0xE002 4060
0xE002 4064
0xE002 4068
0xE002 406C
0xE002 4070
0xE002 4074
0xE002 4078
0xE002 407C
6
Alarm value for Minutes
Alarm value for Hours
ALHOUR
ALDOM
ALDOW
ALDOY
ALMON
ALYEAR
5
5
Alarm value for Day of Month
Alarm value for Day of Week
Alarm value for Day of Year
Alarm value for Months
Alarm value for Years
3
9
4
12
8. Alarm output
The RTC includes an alarm output pin that reflects both the alarm comparisons and
interrupts from the RTC. This pin is in the RTC power domain, and therefore it is available
during all power saving modes as long as power is supplied to VBAT. Since the Alarm pin
combines the alarm and interrupt functions of the RTC, either a specific time/date/etc. or a
periodic interval can be provided to the outside world. For example, a time of day alarm
could be used to tell external circuitry to turn on power to the LPC2400 in order to wake up
from Power-down mode.
9. RTC usage notes
The RTC may be clocked by either the 32.786 kHz RTC oscillator, or by the APB
peripheral clock (PCLK) after adjustment by the reference clock divider.
If the RTC is used, VBAT must be connected to either pin VDD(3V3) or an independent
power supply (external battery). Otherwise, VBAT should be left floating. No provision is
made in the LPC2400 to retain RTC status upon the VBAT power loss, or to maintain time
incrementation if the clock source is lost, interrupted, or altered.
Since the RTC operates using one of two available clocks (the APB clock (PCLK) or the
32 kHz signal coming from the RTCX1-2pins), any interruption of the selected clock will
cause the time to drift away from the time value it would have provided otherwise. The
variance could be to actual clock time if the RTC was initialized to that, or simply an error
in elapsed time since the RTC was activated.
While the signal from RTCX1-2 pins can be used to supply the RTC clock at anytime,
selecting the PCLK as the RTC clock and entering the Power Down mode will cause a
lapse in the time update. Also, feeding the RTC with the PCLK and altering this timebase
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during system operation (by reconfiguring the PLL, the APB divider, or the RTC prescaler)
will result in some form of accumulated time error. Accumulated time errors may occur in
case RTC clock source is switched between the PCLK to the RTCX pins, too.
Once the 32 kHz signal from RTCX1-2 pins is selected as a clock source, the RTC can
operate completely without the presence of the APB clock (PCLK). Therefore, power
sensitive applications (i.e. battery powered application) utilizing the RTC will reduce the
power consumption by using the signal from RTCX1-2 pins, and writing a 0 into the
PCRTC bit in the PCONP power control register (see Section 4–3.4 “Power control” on
page 59).
Remark: Note that if the RTC is running from the 32 kHz signal and powered by VBAT, the
internal registers can be read. However, they cannot be written to unless the PCRTC bit in
10. RTC clock generation
The RTC may be clocked by either the 32.786 kHz RTC oscillator, or by the APB
peripheral clock (PCLK) after adjustment by the reference clock divider.
10.1 Reference Clock Divider (Prescaler)
The reference clock divider (hereafter referred to as the Prescaler) may be used when the
RTC clock source is not supplied by the RTC oscillator, but comes from the APB
peripheral clock (PCLK).
The Prescaler allows generation of a 32.768 kHz reference clock from any PCLK
frequency greater than or equal to 65.536 kHz (2 × 32.768 kHz). This permits the RTC to
always run at the proper rate regardless of the peripheral clock rate. Basically, the
Prescaler divides PCLK by a value which contains both an integer portion and a fractional
portion. The result is not a continuous output at a constant frequency, some clock periods
will be one PCLK longer than others. However, the overall result can always be 32,768
counts per second.
The reference clock divider consists of a 13 bit integer counter and a 15 bit fractional
counter. The reasons for these counter sizes are as follows:
1. For frequencies that are expected to be supported by the LPC2400, a 13 bit integer
counter is required. This can be calculated as 160 MHz divided by 32,768 minus 1
equals 4881 with a remainder of 26,624. Thirteen bits are needed to hold the value
4881, but actually supports frequencies up to 268.4 MHz (32,768 × 8192).
2. The remainder value could be as large as 32,767, which requires 15 bits.
Table 580. Reference Clock Divider registers
Name
Size Description
13 Prescale Value, integer portion
Prescale Value, fractional portion
Access
R/W
Address
PREINT
0xE002 4080
0xE002 4084
PREFRAC 15
R/W
10.2 Prescaler Integer Register (PREINT - 0xE002 4080)
This is the integer portion of the prescale value, calculated as:
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PREINT = int (PCLK/32768) - 1. The value of PREINT must be greater than or equal to 1.
Table 581: Prescaler Integer register (PREINT - address 0xE002 4080) bit description
Bit
Symbol
Description
Reset
Value
12:0
Prescaler Integer Contains the integer portion of the RTC prescaler value.
0
15:13
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
10.3 Prescaler Fraction Register (PREFRAC - 0xE002 4084)
This is the fractional portion of the prescale value, and may be calculated as:
PREFRAC = PCLK - ((PREINT + 1) x 32768).
Table 582: Prescaler Integer register (PREFRAC - address 0xE002 4084) bit description
Bit
14:0
15
Symbol
Description
Reset
Value
Prescaler
Fraction
Contains the integer portion of the RTC prescaler value.
0
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
10.4 Example of Prescaler Usage
In a simplistic case, the PCLK frequency is 65.537 kHz. So:
PREINT = int (PCLK / 32768) - 1 = 1 and
PREFRAC = PCLK - ([PREINT + 1] x 32768) = 1
With this prescaler setting, exactly 32,768 clocks per second will be provided to the RTC
by counting 2 PCLKs 32,767 times, and 3 PCLKs once.
In a more realistic case, the PCLK frequency is 10 MHz. Then,
PREINT = int (PCLK / 32768) - 1 = 304 and
PREFRAC = PCLK - ([PREINT + 1] x 32768) = 5,760.
In this case, 5,760 of the prescaler output clocks will be 306 (305+1) PCLKs long, the rest
will be 305 PCLKs long.
In a similar manner, any PCLK rate greater than 65.536 kHz (as long as it is an even
number of cycles per second) may be turned into a 32 kHz reference clock for the RTC.
The only caveat is that if PREFRAC does not contain a zero, then not all of the 32,768 per
second clocks are of the same length. Some of the clocks are one PCLK longer than
others. While the longer pulses are distributed as evenly as possible among the remaining
pulses, this "jitter" could possibly be of concern in an application that wishes to observe
the contents of the Clock Tick Counter (CTC) directly(Section 26–6.2.2 “Clock Tick
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PCLK
(APB clock)
to clock tick counter
CLK
UNDERFLOW
15 BIT FRACTION COUNTER
CLK
13 BIT INTEGER COUNTER
(DOWN COUNTER)
RELOAD
15
COMBINATORIAL LOGIC
15
13
extend
reload
13 BIT RELOAD INTEGER
REGISTER
15 BIT FRACTION REGISTER
(PREFRAC)
(PREINT)
13
15
APB bus
Fig 135. RTC prescaler block diagram
10.5 Prescaler operation
decrement of the 13 bit PREINT counter is extended by one PCLK. In order to both insert
the correct number of longer cycles, and to distribute them evenly, the combinatorial Logic
associates each bit in PREFRAC with a combination in the 15 bit Fraction Counter. These
For example, if PREFRAC bit 14 is a one (representing the fraction 1/2), then half of the
cycles counted by the 13 bit counter need to be longer. When there is a 1 in the LSB of the
Fraction Counter, the logic causes every alternate count (whenever the LSB of the
Fraction Counter=1) to be extended by one PCLK, evenly distributing the pulse widths.
Similarly, a one in PREFRAC bit 13 (representing the fraction 1/4) will cause every fourth
cycle (whenever the two LSBs of the Fraction Counter = 10) counted by the 13 bit counter
to be longer.
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Chapter 26: LPC24XX Real-Time Clock (RTC) and battery RAM
Table 583. Prescaler cases where the Integer Counter reload value is incremented
Fraction Counter
PREFRAC Bit
14 13 12 11 10 9
8
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
7
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
6
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
5
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
4
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
3
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
2
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
-
--- ---- ---- ---1
--- ---- ---- --10
--- ---- ---- -100
--- ---- ---- 1000
--- ---- ---1 0000
--- ---- --10 0000
--- ---- -100 0000
--- ---- 1000 0000
--- ---1 0000 0000
--- --10 0000 0000
--- -100 0000 0000
--- 1000 0000 0000
--1 0000 0000 0000
-10 0000 0000 0000
100 0000 0000 0000
11. Battery RAM
The Battery RAM is a 2 kbyte static RAM residing on the APB bus. The address range is
0xE008 4000 to 0xE008 47FF.The SRAM can be accessed word-wise (32-bit) only.
The Battery RAM is powered from the VBAT pin along with the RTC, both of which exist
in a power domain that is isolated from the rest of the chip. This allows them to operate
while the main chip power has been removed.
12. RTC external 32 kHz oscillator component selection
resistance is integrated on chip, only a crystal, the capacitances CX1 and CX2 need to be
connected externally to the microcontroller.
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Chapter 26: LPC24XX Real-Time Clock (RTC) and battery RAM
LPC24xx
RTCX1
RTCX2
32 kHz
Xtal
CX1
CX2
Fig 136. RTC 32 kHz crystal oscillator circuit
capacitance of the crystal and is usually specified by the crystal manufacturer. The actual
CL influences oscillation frequency. When using a crystal that is manufactured for a
different load capacitance, the circuit will oscillate at a slightly different frequency
(depending on the quality of the crystal) compared to the specified one. Therefore for an
accurate time reference it is advised to use the load capacitors as specified in
C
X2 specified in this table are calculated from the internal parasitic capacitances and the
CL. Parasitics from PCB and package are not taken into account.
Table 584. Recommended values for the RTC external 32 kHz oscillator CX1/X2 components
Crystal load capacitance Maximum crystal series
External load capacitors CX1,
CX2
CL
resistance RS
11 pF
13 pF
15 pF
< 100 kΩ
18 pF, 18 pF
22 pF, 22 pF
27 pF, 27 pF
< 100 kΩ
< 100 kΩ
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Chapter 27: LPC24XX WatchDog Timer (WDT)
Rev. 02 — 19 December 2008
User manual
1. Features
• Internally resets chip if not periodically reloaded.
• Debug mode.
• Enabled by software but requires a hardware reset or a Watchdog reset/interrupt to be
disabled.
• Incorrect/Incomplete feed sequence causes reset/interrupt if enabled.
• Flag to indicate Watchdog reset.
• Programmable 32 bit timer with internal pre-scaler.
• Selectable time period from (TWDCLK × 256 × 4) to (TWDCLK × 232 × 4) in multiples of
TWDCLK × 4.
• The Watchdog clock (WDCLK) source can be selected from the RTC clock, the
gives a wide range of potential timing choices for Watchdog operation under different
power reduction conditions. It also provides the ability to run the Watchdog timer from
an entirely internal source that is not dependent on an external crystal and its
associated components and wiring, for increased reliability.
2. Applications
The purpose of the Watchdog is to reset the microcontroller within a reasonable amount of
time if it enters an erroneous state. When enabled, the Watchdog will generate a system
reset if the user program fails to "feed" (or reload) the Watchdog within a predetermined
amount of time.
For interaction of the on-chip watchdog and other peripherals, especially the reset and
3. Description
The Watchdog consists of a divide by 4 fixed pre-scaler and a 32 bit counter. The clock is
fed to the timer via a pre-scaler. The timer decrements when clocked. The minimum value
from which the counter decrements is 0xFF. Setting a value lower than 0xFF causes 0xFF
to be loaded in the counter. Hence the minimum Watchdog interval is (TWDCLK × 256 × 4)
and the maximum Watchdog interval is (TWDCLK × 232 × 4) in multiples of (TWDCLK × 4).
The Watchdog should be used in the following manner:
• Set the Watchdog timer constant reload value in WDTC register.
• Setup mode in WDMOD register.
• Enable the Watchdog by writing 0xAA followed by 0x55 to the WDFEED register.
• Watchdog should be fed again before the Watchdog counter underflows to prevent
reset/interrupt.
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Chapter 27: LPC24XX WatchDog Timer (WDT)
When the Watchdog counter underflows, the program counter will start from 0x0000 0000
as in the case of external reset. The Watchdog time-out flag (WDTOF) can be examined
to determine if the Watchdog has caused the reset condition. The WDTOF flag must be
cleared by software.
The watchdog timer block uses two clocks: PCLK and WDCLK. PCLK is used for the APB
accesses to the watchdog registers. The WDCLK is used for the watchdog timer counting.
There is some synchronization logic between these two clock domains. When the
WDMOD and WDTC registers are updated by APB operations, the new value will take
effect in 3 WDCLK cycles on the logic in the WDCLK clock domain. When the watchdog
timer is counting on WDCLK, the synchronization logic will first lock the value of the
counter on WDCLK and then synchronize it with the PCLK for reading as the WDTV
register by the CPU.
4. Register description
Table 585. Summary of Watchdog registers
Name
Description
Access Reset
Value[1]
Address
WDMOD
Watchdog mode register. This register contains R/W
the basic mode and status of the Watchdog
Timer.
0
0xE000 0000
WDTC
Watchdog timer constant register. This register
determines the time-out value.
R/W
0xFF
NA
0xE000 0004
0xE000 0008
WDFEED
Watchdog feed sequence register. Writing 0xAA WO
followed by 0x55 to this register reloads the
Watchdog timer with the value contained in
WDTC.
WDTV
Watchdog timer value register. This register
reads out the current value of the Watchdog
timer.
RO
0xFF
0
0xE000 000C
0xE000 0010
WDCLKSEL Watchdog clock source selection register.
R/W
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
4.1 Watchdog Mode Register (WDMOD - 0xE000 0000)
The WDMOD register controls the operation of the Watchdog as per the combination of
WDEN and RESET bits.
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Chapter 27: LPC24XX WatchDog Timer (WDT)
Table 586. Watchdog operating modes selection
WDEN WDRESET Mode of Operation
0
1
X (0 or 1)
0
Debug/Operate without the Watchdog running.
Watchdog interrupt mode: debug with the Watchdog interrupt but no
WDRESET enabled.
When this mode is selected, a watchdog counter underflow will set the
WDINT flag and the Watchdog interrupt request will be generated.
1
1
Watchdog reset mode: operate with the Watchdog interrupt and
WDRESET enabled.
When this mode is selected, a watchdog counter underflow will reset
the microcontroller. Although the Watchdog interrupt is also enabled in
this case (WDEN = 1) it will not be recognized since the watchdog
reset will clear the WDINT flag.
Once the WDEN and/or WDRESET bits are set they can not be cleared by software. Both
flags are cleared by an external reset or a Watchdog timer underflow.
WDTOF The Watchdog time-out flag is set when the Watchdog times out. This flag is
cleared by software.
WDINT The Watchdog interrupt flag is set when the Watchdog times out. This flag is
cleared when any reset occurs. Once the watchdog interrupt is serviced, it can be
disabled in the VIC or the watchdog interrupt request will be generated indefinitely.
Table 587: Watchdog Mode register (WDMOD - address 0xE000 0000) bit description
Bit
0
Symbol
Description
Reset Value
WDEN
WDEN Watchdog interrupt enable bit (Set Only).
0
0
1
WDRESET WDRESET Watchdog reset enable bit (Set Only).
2
WDTOF
WDTOF Watchdog time-out flag.
0 (Only after
external reset)
3
WDINT
-
WDINT Watchdog interrupt flag (Read Only).
0
7:4
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
4.2 Watchdog Timer Constant Register (WDTC - 0xE000 0004)
The WDTC register determines the time-out value. Every time a feed sequence occurs
the WDTC content is reloaded in to the Watchdog timer. It’s a 32 bit register with 8 LSB
set to 1 on reset. Writing values below 0xFF will cause 0x0000 00FF to be loaded to the
WDTC. Thus the minimum time-out interval is TWDCLK × 256 × 4.
Table 588: Watchdog Constant register (WDTC - address 0xE000 0004) bit description
Bit
Symbol
Description
Reset Value
31:0
Count
Watchdog time-out interval.
0x0000 00FF
4.3 Watchdog Feed Register (WDFEED - 0xE000 0008)
Writing 0xAA followed by 0x55 to this register will reload the Watchdog timer with the
WDTC value. This operation will also start the Watchdog if it is enabled via the WDMOD
register. Setting the WDEN bit in the WDMOD register is not sufficient to enable the
Watchdog. A valid feed sequence must be completed after setting WDEN before the
Watchdog is capable of generating a reset. Until then, the Watchdog will ignore feed
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Chapter 27: LPC24XX WatchDog Timer (WDT)
errors. After writing 0xAA to WDFEED, access to any Watchdog register other than writing
0x55 to WDFEED causes an immediate reset/interrupt when the Watchdog is enabled.
The reset will be generated during the second PCLK following an incorrect access to a
Watchdog register during a feed sequence.
Interrupts should be disabled during the feed sequence. An abort condition will occur if an
interrupt happens during the feed sequence.
Table 589: Watchdog Feed Register (WDFEED - address 0xE000 0008) bit description
Bit
Symbol
Description
Reset Value
7:0
Feed
Feed value should be 0xAA followed by 0x55.
NA
4.4 Watchdog Timer Value Register (WDTV - 0xE000 000C)
The WDTV register is used to read the current value of Watchdog timer.
When reading the value of the 32 bit timer, the lock and synchronization procedure takes
up to 6 WDCLK cycles plus 6 PCLK cycles, so the value of WDTV is older than the actual
value of the timer when it's being read by the CPU.
Table 590: Watchdog Timer Value register (WDTV - address 0xE000 000C) bit description
Bit
Symbol
Description
Reset Value
31:0
Count
Counter timer value.
0x0000 00FF
4.5 Watchdog Timer Clock Source Selection Register (WDCLKSEL -
0xE000 0010)
This register allows selecting the clock source for the Watchdog timer. The possibilities are: the
Internal RC oscillator (IRC), the RTC oscillator, and the APB peripheral clock (pclk). The function of
Table 591: Watchdog Timer Clock Source Selection register (WDCLKSEL - address
0xE000 0010) bit description
Bit Symbol Value Description
Reset
Value
1:0 WDSEL These bits select the clock source for the Watchdog timer as
0
described below.
Warning: Improper setting of this value may result in incorrect
operation of the Watchdog timer, which could adversely affect
system operation.
00
01
Selects the Internal RC oscillator as the Watchdog clock source
(default).
Selects the APB peripheral clock (PCLK) as the Watchdog clock
source.
10
11
-
Selects the RTC oscillator as the Watchdog clock source.
Reserved
31:2 -
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
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Chapter 27: LPC24XX WatchDog Timer (WDT)
5. Block diagram
synchronization logic (PCLK - WDCLK) is not shown in the block diagram.
feed sequence
WDTC
feed ok
WDFEED
feed error
RTC oscillator
wdclk
÷ 4
32 BIT DOWN COUNTER
underflow
pclk
internal RC oscillator
enable
count
WDCLKSEL
SHADOW BIT
WMOD register
WDINT WDTOF WDRESET WDEN
reset
interrupt
Fig 137. Watchdog block diagram
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Chapter 28: LPC24XX Analog-to Digital Converter (ADC)
Rev. 02 — 19 December 2008
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1. Basic configuration
The ADC is configured using the following registers:
Remark: On reset, the ADC is disabled. To enable the ADC, first set the PCADC bit,
the ADC, first clear the PDN bit, and then clear the PCADC bit.
3. Pins: Select ADC pins and pin modes in registers PINSELn and PINMODEn (see
2. Features
• 10 bit successive approximation analog to digital converter.
• Input multiplexing among 8 pins.
• Power down mode.
• Measurement range 0 to 3 V.
• 10 bit conversion time ≥ 2.44 μs.
• Burst conversion mode for single or multiple inputs.
• Optional conversion on transition on input pin or Timer Match signal.
• Individual result registers for each A/D channel to reduce interrupt overhead.
3. Description
Basic clocking for the A/D converters is provided by the APB clock (PCLK). A
programmable divider is included in each converter, to scale this clock to the 4.5 MHz
(max) clock needed by the successive approximation process. A fully accurate conversion
requires 11 of these clocks.
4. Pin description
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Chapter 28: LPC24XX Analog-to Digital Converter (ADC)
Table 592. ADC pin description
Pin
Type
Description
AD0[7:0]
Input
Analog Inputs. The A/D converter cell can measure the voltage on any of these input signals.
Note that these analog inputs are always connected to their pins, even if the Pin Multiplexing
Register assigns them to port pins. A simple self-test of the A/D Converter can be done by driving
these pins as port outputs.
in the ADC block is not. More than VDD(3V3)/VREF/3.3 V (VDDA) should not be applied to any pin
that is selected as an ADC input, or the ADC reading will be incorrect. If for example AD0.0 and
AD0.1 are used as the ADC0 inputs and voltage on AD0.0 = 4.5 V while AD0.1 = 2.5 V, an
excessive voltage on the AD0.0 can cause an incorrect reading of the AD0.1, although the AD0.1
input voltage is within the right range.
If the A/D converter is not used in an application then the pins associated with A/D inputs can be
used as 5V tolerant digital IO pins
VREF
Reference Voltage Reference. This pin provides a voltage reference level for the A/D converter.
VDDA, VSSA Power
Analog Power and Ground. These should be nominally the same voltages as VDD(3V3) and VSS
respectively but should be isolated to minimize noise and error.
Remark: When the ADC is not used, the VDDA and VREF pins must be connected to the
power supply, and pin VSSA must be grounded. These pins should not be left floating.
5. Register description
The base address of the ADC is 0xE003 4000. The A/D Converter includes registers as
Table 593. Summary of ADC registers
Name
Description
Access Reset
Value[1]
Address
AD0CR
A/D Control Register. The AD0CR register
must be written to select the operating mode
before A/D conversion can occur.
R/W
0x0000 0001 0xE003 4000
AD0GDR
A/D Global Data Register. Contains the result R/W
of the most recent A/D conversion.
NA
0
0xE003 4004
0xE003 4030
AD0STAT A/D Status Register. This register contains
DONE and OVERRUN flags for all of the A/D
channels, as well as the A/D interrupt flag.
RO
AD0INTEN A/D Interrupt Enable Register. This register
contains enable bits that allow the DONE flag
of each A/D channel to be included or
excluded from contributing to the generation
of an A/D interrupt.
R/W
0x0000 0100 0xE003 400C
AD0DR0
AD0DR1
AD0DR2
A/D Channel 0 Data Register. This register
contains the result of the most recent
conversion completed on channel 0
R/W
R/W
R/W
NA
NA
NA
0xE003 4010
0xE003 4014
0xE003 4018
A/D Channel 1 Data Register. This register
contains the result of the most recent
conversion completed on channel 1.
A/D Channel 2 Data Register. This register
contains the result of the most recent
conversion completed on channel 2.
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Chapter 28: LPC24XX Analog-to Digital Converter (ADC)
Table 593. Summary of ADC registers
Name
Description
Access Reset
Value[1]
Address
AD0DR3
A/D Channel 3 Data Register. This register
contains the result of the most recent
conversion completed on channel 3.
R/W
R/W
R/W
R/W
R/W
NA
NA
NA
NA
NA
0xE003 401C
AD0DR4
AD0DR5
AD0DR6
AD0DR7
A/D Channel 4 Data Register. This register
contains the result of the most recent
conversion completed on channel 4.
0xE003 4020
0xE003 4024
0xE003 4028
0xE003 402C
A/D Channel 5 Data Register. This register
contains the result of the most recent
conversion completed on channel 5.
A/D Channel 6 Data Register. This register
contains the result of the most recent
conversion completed on channel 6.
A/D Channel 7 Data Register. This register
contains the result of the most recent
conversion completed on channel 7.
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
5.1 A/D Control Register (AD0CR - 0xE003 4000)
The A/D Control Register provides bits to select A/D channels to be converted, A/D timing,
A/D modes, and the A/D start trigger.
Table 594: A/D Control Register (AD0CR - address 0xE003 4000) bit description
Bit
Symbol Value Description
Reset
Value
7:0
SEL Selects which of the AD0.7:0 pins is (are) to be sampled and converted. For AD0, bit 0
0x01
selects Pin AD0.0, and bit 7 selects pin AD0.7. In software-controlled mode, only one of
these bits should be 1. In hardware scan mode, any value containing 1 to 8 ones. All
zeroes is equivalent to 0x01.
15:8 CLKDIV
The APB clock (PCLK) is divided by (this value plus one) to produce the clock for the A/D
converter, which should be less than or equal to 4.5 MHz. Typically, software should
program the smallest value in this field that yields a clock of 4.5 MHz or slightly less, but in
certain cases (such as a high-impedance analog source) a slower clock may be
desirable.
0
16
BURST
0
1
Conversions are software controlled and require 11 clocks.
0
The AD converter does repeated conversions at the rate selected by the CLKS field,
scanning (if necessary) through the pins selected by 1s in the SEL field. The first
conversion after the start corresponds to the least-significant 1 in the SEL field, then
higher numbered 1 bits (pins) if applicable. Repeated conversions can be terminated by
clearing this bit, but the conversion that’s in progress when this bit is cleared will be
completed.
Important: START bits must be 000 when BURST = 1 or conversions will not start.
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Chapter 28: LPC24XX Analog-to Digital Converter (ADC)
Table 594: A/D Control Register (AD0CR - address 0xE003 4000) bit description
Bit Symbol Value Description
Reset
Value
19:17 CLKS
This field selects the number of clocks used for each conversion in Burst mode, and the 000
number of bits of accuracy of the result in the LS bits of ADDR, between 11 clocks
(10 bits) and 4 clocks (3 bits).
000
001
010
011
100
101
110
111
11 clocks / 10 bits
10 clocks / 9 bits
9 clocks / 8 bits
8 clocks / 7 bits
7 clocks / 6 bits
6 clocks / 5 bits
5 clocks / 4 bits
4 clocks / 3 bits
20
21
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
0
PDN
1
0
The A/D converter is operational.
The A/D converter is in power-down mode.
23:22 -
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
0
26:24 START
When the BURST bit is 0, these bits control whether and when an A/D conversion is
started:
000
001
010
011
100
101
110
111
No start (this value should be used when clearing PDN to 0).
Start conversion now.
Start conversion when the edge selected by bit 27 occurs on P2.10/EINT0.
Start conversion when the edge selected by bit 27 occurs on P1.27/CAP0.1.
Start conversion when the edge selected by bit 27 occurs on MAT0.1.
Start conversion when the edge selected by bit 27 occurs on MAT0.3.
Start conversion when the edge selected by bit 27 occurs on MAT1.0.
Start conversion when the edge selected by bit 27 occurs on MAT1.1.
This bit is significant only when the START field contains 010-111. In these cases:
Start conversion on a falling edge on the selected CAP/MAT signal.
Start conversion on a rising edge on the selected CAP/MAT signal.
27
EDGE
0
1
0
31:28 -
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
5.2 A/D Global Data Register (AD0GDR - 0xE003 4004)
The A/D Global Data Register contains the result of the most recent A/D conversion. This
includes the data, DONE, and Overrun flags, and the number of the A/D channel to which
the data relates.
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Chapter 28: LPC24XX Analog-to Digital Converter (ADC)
Table 595: A/D Global Data Register (AD0GDR - address 0xE003 4004) bit description
Bit
Symbol Description
Reset
Value
5:0
Unused These bits always read as zeroes. They provide compatible expansion
room for future, higher-resolution A/D converters.
0
15:6 V/VREF
When DONE is 1, this field contains a binary fraction representing the
voltage on the Ain pin selected by the SEL field, divided by the voltage
on the VDDA pin. Zero in the field indicates that the voltage on the Ain
pin was less than, equal to, or close to that on VSSA, while 0x3FF
indicates that the voltage on Ain was close to, equal to, or greater than
X
that on VREF
.
23:16 Unused These bits always read as zeroes. They allow accumulation of
successive A/D values without AND-masking, for at least 256 values
without overflow into the CHN field.
0
26:24 CHN
These bits contain the channel from which the LS bits were converted.
X
0
29:27 Unused These bits always read as zeroes. They could be used for expansion of
the CHN field in future compatible A/D converters that can convert more
channels.
30
OVERU This bit is 1 in burst mode if the results of one or more conversions was
0
0
N
(were) lost and overwritten before the conversion that produced the
result in the LS bits. In non-FIFO operation, this bit is cleared by reading
this register.
31
DONE
This bit is set to 1 when an A/D conversion completes. It is cleared
when this register is read and when the ADCR is written. If the ADCR is
written while a conversion is still in progress, this bit is set and a new
conversion is started.
5.3 A/D Status Register (AD0STAT - 0xE003 4030)
The A/D Status register allows checking the status of all A/D channels simultaneously.
The DONE and OVERRUN flags appearing in the ADDRn register for each A/D channel
are mirrored in ADSTAT. The interrupt flag (the logical OR of all DONE flags) is also found
in ADSTAT.
Table 596: A/D Status Register (AD0STAT - address 0xE003 4030) bit description
Bit
Symbol
Description
Reset
Value
7:0
Done7:0
These bits mirror the DONE status flags that appear in the result
register for each A/D channel.
0
15:8 Overrun7:0 These bits mirror the OVERRRUN status flags that appear in the
result register for each A/D channel. Reading ADSTAT allows
checking the status of all A/D channels simultaneously.
0
16
ADINT
This bit is the A/D interrupt flag. It is one when any of the individual
A/D channel Done flags is asserted and enabled to contribute to the
A/D interrupt via the ADINTEN register.
0
0
31:17 Unused
Unused, always 0.
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Chapter 28: LPC24XX Analog-to Digital Converter (ADC)
5.4 A/D Interrupt Enable Register (AD0INTEN - 0xE003 400C)
This register allows control over which A/D channels generate an interrupt when a
conversion is complete. For example, it may be desirable to use some A/D channels to
monitor sensors by continuously performing conversions on them. The most recent
results are read by the application program whenever they are needed. In this case, an
interrupt is not desirable at the end of each conversion for some A/D channels.
Table 597: A/D Interrupt Enable Register (AD0INTEN - address 0xE003 400C) bit description
Bit Symbol
Description
Reset
Value
7:0 ADINTEN 7:0 These bits allow control over which A/D channels generate
interrupts for conversion completion. When bit 0 is one, completion
of a conversion on A/D channel 0 will generate an interrupt, when bit
1 is one, completion of a conversion on A/D channel 1 will generate
an interrupt, etc.
0x00
8
ADGINTEN
When 1, enables the global DONE flag in ADDR to generate an
interrupt. When 0, only the individual A/D channels enabled by
ADINTEN 7:0 will generate interrupts.
1
0
31:9 Unused
Unused, always 0.
5.5 A/D Data Registers (AD0DR0 to AD0DR7 - 0xE003 4010 to
0xE003 402C)
The A/D Data Register hold the result when an A/D conversion is complete, and also
include the flags that indicate when a conversion has been completed and when a
conversion overrun has occurred.
Table 598: A/D Data Registers (AD0DR0 to AD0DR7 - addresses 0xE003 4010 to
0xE003 402C) bit description
Bit
Symbol
Description
Reset
Value
5:0
Unused
Unused, always 0.
0
These bits always read as zeroes. They provide compatible expansion
room for future, higher-resolution ADCs.
15:6 V/VREF
29:16 Unused
When DONE is 1, this field contains a binary fraction representing the NA
voltage on the Ain pin, divided by the voltage on the Vref pin. Zero in
the field indicates that the voltage on the Ain pin was less than, equal
to, or close to that on VREF, while 0x3FF indicates that the voltage on
Ain was close to, equal to, or greater than that on Vref.
These bits always read as zeroes. They allow accumulation of
successive A/D values without AND-masking, for at least 256 values
without overflow into the CHN field.
0
0
0
30
31
OVERRUN This bit is 1 in burst mode if the results of one or more conversions
was (were) lost and overwritten before the conversion that produced
the result in the LS bits.This bit is cleared by reading this register.
DONE
This bit is set to 1 when an A/D conversion completes. It is cleared
when this register is read.
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Chapter 28: LPC24XX Analog-to Digital Converter (ADC)
6. Operation
6.1 Hardware-triggered conversion
If the BURST bit in the ADCR is 0 and the START field contains 010-111, the A/D
converter will start a conversion when a transition occurs on a selected pin or Timer Match
signal. The choices include conversion on a specified edge of any of 4 Match signals, or
conversion on a specified edge of either of 2 Capture/Match pins. The pin state from the
selected pad or the selected Match signal, XORed with ADCR bit 27, is used in the edge
detection logic.
6.2 Interrupts
An interrupt is requested to the Vectored Interrupt Controller (VIC) when the ADINT bit in
the ADSTAT register is 1. The ADINT bit is one when any of the DONE bits of A/D
channels that are enabled for interrupts (via the ADINTEN register) are one. Software
can use the Interrupt Enable bit in the VIC that corresponds to the ADC to control whether
this results in an interrupt. The result register for an A/D channel that is generating an
interrupt must be read in order to clear the corresponding DONE flag.
6.3 Accuracy vs. digital receiver
While the A/D converter can be used to measure the voltage on any AD0 pin, regardless
registers” on page 177), selecting the AD0 function improves the conversion accuracy by
disabling the pin’s digital receiver.
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Chapter 29: LPC24XX Digital-to Analog Converter (DAC)
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1. Basic configuration
The DAC is configured using the following registers:
1. Power: The DAC is always on.
3. Pins: Select the DAC pin and pin mode in registers PINSEL1 and PINMODE1 (see
2. Features
• 10 bit digital to analog converter
• Resistor string architecture
• Buffered output
• Power down mode
• Selectable speed vs. power
3. Pin description
Table 599. D/A Pin Description
Pin
Type
Description
AOUT
Output
Analog Output. After the selected settling time after the DACR is
written with a new value, the voltage on this pin (with respect to
VSSA) is VALUE/1024 × VREF.
VREF
Reference Voltage Reference. This pin provides a voltage reference level for
the D/A converter.
VDDA, VSSA
Power
Analog Power and Ground. These should be nominally the same
voltages as VDD(3V3) and VSS, but should be isolated to minimize
noise and error.
Remark: When the DAC is not used, the VDDA and VREF pins must be connected to the
power supply, and pin VSSA must be grounded. These pins should not be left floating.
4. Register description (DACR - 0xE006 C000)
This read/write register includes the digital value to be converted to analog, and a bit that
trades off performance vs. power. Bits 5:0 are reserved for future, higher-resolution D/A
converters.
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Chapter 29: LPC24XX Digital-to Analog Converter (DAC)
Table 600: D/A Converter Register (DACR - address 0xE006 C000) bit description
Bit
Symbol Value Description
Reset
Value
5:0
-
Reserved, user software should not write ones to reserved
NA
bits. The value read from a reserved bit is not defined.
15:6 VALUE
After the selected settling time after this field is written with a
new VALUE, the voltage on the AOUT pin (with respect to VSSA
is VALUE/1024 × VREF.
0
)
16
BIAS
0
1
The settling time of the DAC is 1 μs max, and the maximum
current is 700 μA.
0
The settling time of the DAC is 2.5 μs and the maximum
current is 350 μA.
31:17
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
5. Operation
Bits 21:20 of the PINSEL1 register (Section 9–5.2 “Pin Function Select Register 1
(PINSEL1 - 0xE002 C004)” on page 179) control whether the DAC is enabled and
controlling the state of pin P0.26/AD0.3/AOUT/RXD3. When these bits are 10, the DAC is
powered on and active.
The settling times noted in the description of the BIAS bit are valid for a capacitance load
on the AOUT pin not exceeding 100 pF. A load impedance value greater than that value
will cause settling time longer than the specified time. One or more graph(s) of load
impedance vs. settling time will be included in the final data sheet.
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Chapter 30: LPC24XX Flash memory programming firmware
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User manual
1. How to read this chapter
Remark: This chapter applies to parts LPC2458, LPC2468, and LPC2478.
2. Flash boot loader
The Boot Loader controls initial operation after reset, and also provides the means to
accomplish programming of the Flash memory. This could be initial programming of a
blank device, erasure and re-programming of a previously programmed device, or
programming of the Flash memory by the application program in a running system.
3. Features
• In-System Programming: In-System programming (ISP) is programming or
reprogramming the on-chip Flash memory, using the boot loader software and UART0
serial port. This can be done when the part resides in the end-user board.
• In Application Programming: In-Application (IAP) programming is performing erase
and write operation on the on-chip Flash memory, as directed by the end-user
application code.
4. Applications
The Flash boot loader provides both In-System and In-Application programming
interfaces for programming the on-chip Flash memory.
5. Description
The Flash boot loader code is executed every time the part is powered on or reset. The
loader can execute the ISP command handler or the user application code. A LOW level
after reset at the P2.10 pin is considered as an external hardware request to start the ISP
command handler. Assuming that power supply pins are on their nominal levels when the
rising edge on RESET pin is generated, it may take up to 3 ms before P2.10 is sampled
and the decision on whether to continue with user code or ISP handler is made. If P2.10 is
sampled low and the watchdog overflow flag is set, the external hardware request to start
the ISP command handler is ignored. If there is no request for the ISP command handler
execution (P2.10 is sampled HIGH after reset), a search is made for a valid user program.
If a valid user program is found then the execution control is transferred to it. If a valid user
program is not found, the auto-baud routine is invoked.
Pin P2.10 that is used as hardware request for ISP requires special attention. Since P2.10
is in high impedance mode after reset, it is important that the user provides external
hardware (a pull-up resistor or other device) to put the pin in a defined state. Otherwise
unintended entry into ISP mode may occur.
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Chapter 30: LPC24XX Flash memory programming firmware
When ISP mode is entered after a power on reset, the IRC and PLL are used to generate
CCLK of 14.748 MHz. This may not be the case when ISP is invoked by the user
5.1 Memory map after any reset
The Flash portion of the boot block is 8 kB in size and resides in the top portion (starting
from 0x0007 E000) of the on-chip Flash memory. After any reset the entire boot block is
also mapped to the top of the on-chip memory space i.e. the boot block is also visible in
the memory region starting from the address 0x7FFF E000. The Flash boot loader is
designed to run from this memory area, but both the ISP and IAP software use parts of the
on-chip RAM. The RAM usage is described later in this chapter. The interrupt vectors
residing in the boot block of the on-chip Flash memory also become active after reset, i.e.,
the bottom 64 bytes of the boot block are also visible in the memory region starting from
the address 0x0000 0000. The reset vector contains a jump instruction to the entry point
of the flash boot loader software.
0x7FFF FFFF
0x7FFF E000
2.0 GB
8 kB BOOT BLOCK
(RE-MAPPED FROM TOP OF FLASH MEMORY)
(BOOT BLOCK INTERRUPT VECTORS)
2.0 GB - 8 kB
0x0007 FFFF
0x0007 E000
8 kB BOOT BLOCK RE-MAPPED TO
HIGHER ADDRESS RANGE
ON-CHIP FLASH MEMORY
ACTIVE INTERRUPT VECTORS
FROM THE BOOT BLOCK
0.0 GB
0x0000 0000
Fig 138. Map of lower memory after reset
5.1.1 Criterion for Valid User Code
Criterion for valid user code: The reserved ARM interrupt vector location (0x0000 0014)
should contain the 2’s complement of the check-sum of the remaining interrupt vectors.
This causes the checksum of all of the vectors together to be 0. The boot loader code
disables the overlaying of the interrupt vectors from the boot block, then checksums the
interrupt vectors in sector 0 of the Flash. If the signatures match then the execution
control is transferred to the user code by loading the program counter with 0x0000 0000.
Hence the user Flash reset vector should contain a jump instruction to the entry point of
the user application code.
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Chapter 30: LPC24XX Flash memory programming firmware
If the signature is not valid, the auto-baud routine synchronizes with the host via serial port
0. The host should send a ’?’ (0x3F) as a synchronization character and wait for a
response. The host side serial port settings should be 8 data bits, 1 stop bit and no parity.
The auto-baud routine measures the bit time of the received synchronization character in
terms of its own frequency and programs the baud rate generator of the serial port. It also
sends an ASCII string ("Synchronized<CR><LF>") to the Host. In response to this host
should send the same string ("Synchronized<CR><LF>"). The auto-baud routine looks at
the received characters to verify synchronization. If synchronization is verified then
"OK<CR><LF>" string is sent to the host. Host should respond by sending the crystal
frequency (in kHz) at which the part is running. For example, if the part is running at 10
MHz , the response from the host should be "10000<CR><LF>". "OK<CR><LF>" string is
sent to the host after receiving the crystal frequency. If synchronization is not verified then
the auto-baud routine waits again for a synchronization character. For auto-baud to work
correctly in case of user invoked ISP, the CCLK frequency should be greater than or equal
to 10 MHz.
For more details on Reset, PLL and startup/boot code interaction see Section 4–3.2.2
Once the crystal frequency is received the part is initialized and the ISP command handler
is invoked. For safety reasons an "Unlock" command is required before executing the
commands resulting in Flash erase/write operations and the "Go" command. The rest of
the commands can be executed without the unlock command. The Unlock command is
required to be executed once per ISP session. The Unlock command is explained in
5.2 Communication protocol
All ISP commands should be sent as single ASCII strings. Strings should be terminated
with Carriage Return (CR) and/or Line Feed (LF) control characters. Extra <CR> and
<LF> characters are ignored. All ISP responses are sent as <CR><LF> terminated ASCII
strings. Data is sent and received in UU-encoded format.
5.2.1 ISP command format
"Command Parameter_0 Parameter_1 ... Parameter_n<CR><LF>" "Data" (Data only for
Write commands).
5.2.2 ISP response format
"Return_Code<CR><LF>Response_0<CR><LF>Response_1<CR><LF> ...
Response_n<CR><LF>" "Data" (Data only for Read commands).
5.2.3 ISP data format
The data stream is in UU-encode format. The UU-encode algorithm converts 3 bytes of
binary data in to 4 bytes of printable ASCII character set. It is more efficient than Hex
format which converts 1 byte of binary data in to 2 bytes of ASCII hex. The sender should
send the check-sum after transmitting 20 UU-encoded lines. The length of any
UU-encoded line should not exceed 61 characters(bytes) i.e. it can hold 45 data bytes.
The receiver should compare it with the check-sum of the received bytes. If the
check-sum matches then the receiver should respond with "OK<CR><LF>" to continue
further transmission. If the check-sum does not match the receiver should respond with
"RESEND<CR><LF>". In response the sender should retransmit the bytes.
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A description of UU-encode is available at the wotsit webpage.
5.2.4 ISP flow control
A software XON/XOFF flow control scheme is used to prevent data loss due to buffer
overrun. When the data arrives rapidly, the ASCII control character DC3 (stop) is sent to
stop the flow of data. Data flow is resumed by sending the ASCII control character DC1
(start). The host should also support the same flow control scheme.
5.2.5 ISP command abort
Commands can be aborted by sending the ASCII control character "ESC". This feature is
not documented as a command under "ISP Commands" section. Once the escape code is
received the ISP command handler waits for a new command.
5.2.6 Interrupts during ISP
The boot block interrupt vectors located in the boot block of the Flash are active after any
reset.
5.2.7 Interrupts during IAP
The on-chip Flash memory is not accessible during erase/write operations. When the user
application code starts executing the interrupt vectors from the user Flash area are active.
The user should either disable interrupts, or ensure that user interrupt vectors are active in
RAM and that the interrupt handlers reside in RAM, before making a Flash erase/write IAP
call. The IAP code does not use or disable interrupts.
5.2.8 RAM used by ISP command handler
ISP commands use on-chip RAM from 0x4000 0120 to 0x4000 01FF. The user could use
this area, but the contents may be lost upon reset. Flash programming commands use the
top 32 bytes of on-chip RAM. The stack is located at RAM top - 32. The maximum stack
usage is 256 bytes and it grows downwards.
5.2.9 RAM used by IAP command handler
Flash programming commands use the top 32 bytes of on-chip RAM. The maximum stack
usage in the user allocated stack space is 128 bytes and it grows downwards.
5.2.10 RAM used by RealMonitor
The RealMonitor uses on-chip RAM from 0x4000 0040 to 0x4000 011F. The user could
use this area if RealMonitor based debug is not required. The Flash boot loader does not
initialize the stack for RealMonitor.
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Chapter 30: LPC24XX Flash memory programming firmware
6. Boot process flowchart
RESET
INITIALIZE
no
CRP1/2/3ENABLED?
ENABLE DEBUG
yes
yes
WATCHDOG
FLAG SET?
A
no
yes
USER CODE
VALID?
no
CRP3ENABLED?
yes
EXECUTE INTERNAL
USER CODE
Enter ISP
MODE?
(P2.10=LOW)
no
USER CODE VALID?
no
yes
yes
A
RUN AUTO-BAUD
no
AUTO-BAUD
SUCCESSFUL?
yes
RUN ISP COMMAND
HANDLER2
RECEIVE CRYSTAL
FREQUENCY1
(2) For details on available ISP commands based on the CRP settings see Section 30–8 “Code Read Protection (CRP)”
Fig 139. Boot process flowchart
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Chapter 30: LPC24XX Flash memory programming firmware
7. Sector numbers
Some IAP and ISP commands operate on "sectors" and specify sector numbers. The
following table indicate the correspondence between sector numbers and memory
addresses for LPC2400 devices. IAP, ISP, and RealMonitor routines are located in the
boot block. The boot block is present at addresses 0x0007 E000 to 0x0007 FFFF. ISP and
IAP commands do not allow write/erase/go operation on the boot block. Because of the
boot block, the amount of Flash available for user code and data is 504 K bytes.
Table 601. Sectors in a LPC2400 device
Sector
Sector size [kB]
Address range
number
0
4
0X0000 0000 - 0X0000 0FFF
0X0000 1000 - 0X0000 1FFF
0X0000 2000 - 0X0000 2FFF
0X0000 3000 - 0X0000 3FFF
0X0000 4000 - 0X0000 4FFF
0X0000 5000 - 0X0000 5FFF
0X0000 6000 - 0X0000 6FFF
0X0000 7000 - 0X0000 7FFF
0x0000 8000 - 0X0000 FFFF
0x0001 0000 - 0X0001 7FFF
0x0001 8000 - 0X0001 FFFF
0x0002 0000 - 0X0002 7FFF
0x0002 8000 - 0X0002 FFFF
0x0003 0000 - 0X0003 7FFF
0x0003 8000 - 0X0003 FFFF
0x0004 0000 - 0X0004 7FFF
0x0004 8000 - 0X0004 FFFF
0x0005 0000 - 0X0005 7FFF
0x0005 8000 - 0X0005 FFFF
0x0006 0000 - 0X0006 7FFF
0x0006 8000 - 0X0006 FFFF
0x0007 0000 - 0X0007 7FFF
0x0007 8000 - 0X0007 8FFF
0x0007 9000 - 0X0007 9FFF
0x0007 A000 - 0X0007 AFFF
0x0007 B000 - 0X0007 BFFF
0x0007 C000 - 0X0007 CFFF
0x0007 D000 - 0X0007 DFFF
1
4
2
4
3
4
4
4
5
4
6
4
7
4
8
32
32
32
32
32
32
32
32
32
32
32
32
32
32
4
9
10 (0x0A)
11 (0x0B)
12 (0x0C)
13 (0x0D)
14 (0X0E)
15 (0x0F)
16 (0x10)
17 (0x11)
18 (0x12)
19 (0x13)
20 (0x14)
21 (0x15)
22 (0x16)
23 (0x17)
24 (0x18)
25 (0x19)
26 (0x1A)
27 (0x1B)
4
4
4
4
4
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Chapter 30: LPC24XX Flash memory programming firmware
8. Code Read Protection (CRP)
Code Read Protection is a mechanism that allows user to enable different levels of
security in the system so that access to the on-chip Flash and use of the ISP can be
restricted. When needed, CRP is invoked by programming a specific pattern in Flash
location at 0x000001FC. IAP commands are not affected by the code read protection.
Starting with bootloader version 3.2 three levels of CRP are implemented. Earlier
bootloader versions had only CRP2 option implemented.
Important: any CRP change becomes effective only after the device has gone
through a power cycle.
Table 602. Code Read Protection options
Name Pattern
programmed
Description
in 0x000001FC
CRP1 0x12345678
Access to chip via the JTAG pins is disabled. This mode allows partial
Flash update using the following ISP commands and restrictions:
• Write to RAM command can not access RAM below 0x40000200
• Copy RAM to Flash command can not write to Sector 0
• Erase command can erase Sector 0 only when all sectors are
selected for erase
• Compare command is disabled
This mode is useful when CRP is required and Flash field updates are
needed but all sectors can not be erased. Since compare command is
disabled in case of partial updates the secondary loader should
implement checksum mechanism to verify the integrity of the Flash.
CRP2 0x87654321
Access to chip via the JTAG pins is disabled. The following ISP
commands are disabled:
• Read Memory
• Write to RAM
• Go
• Copy RAM to Flash
• Compare
When CRP2 is enabled the ISP erase command only allows erasure of
all user sectors.
CRP3 0x43218765
Access to chip via the JTAG pins is disabled. ISP entry by pulling P2.10
LOW is disabled if a valid user code is present in Flash sector 0.
This mode effectively disables ISP overide using P2.10 pin. It is up to the
user’s application to provide need Flash update mechanism using IAP
calls or call reinvoke ISP command to enable Flash update via UART0.
Caution: If CRP3 is selected, no future factory testing can be
performed on the device.
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Chapter 30: LPC24XX Flash memory programming firmware
Table 603. Code Read Protection hardware/software interaction
CRP option
User Code
Valid
P2.10 pin at
reset
JTAG enabled LPC2400
enters ISP
partial Flash
Update in ISP
mode
mode
No
No
X
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Yes
No
Yes
NA
Yes
NA
Yes
NA
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
High
Low
High
Low
High
Low
x
No
Yes
No
CRP1
CRP1
CRP2
CRP2
CRP3
CRP1
CRP2
CRP3
Yes
No
Yes
No
NA
Yes
No
x
Yes
Yes
Yes
No
x
No
x
No
In case a CRP mode is enabled and access to the chip is allowed via the ISP, an
unsupoorted or restricted ISP command will be terminated with return code
CODE_READ_PROTECTION_ENABLED.
9. ISP commands
The following commands are accepted by the ISP command handler. Detailed status
codes are supported for each command. The command handler sends the return code
INVALID_COMMAND when an undefined command is received. Commands and return
codes are in ASCII format.
CMD_SUCCESS is sent by ISP command handler only when received ISP command has
been completely executed and the new ISP command can be given by the host.
Exceptions from this rule are "Set Baud Rate", "Write to RAM", "Read Memory", and "Go"
commands.
Table 604. ISP command summary
ISP Command
Unlock
Usage
Described in
U <Unlock Code>
Set Baud Rate
Echo
B <Baud Rate> <stop bit>
A <setting>
Write to RAM
Read Memory
W <start address> <number of bytes>
R <address> <number of bytes>
P <start sector number> <end sector number>
Prepare sector(s) for
write operation
Copy RAM to Flash
Go
G <address> <Mode>
Erase sector(s)
Blank check sector(s)
E <start sector number> <end sector number>
I <start sector number> <end sector number>
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Chapter 30: LPC24XX Flash memory programming firmware
Table 604. ISP command summary
ISP Command
Read Part ID
Usage
Described in
J
Read Boot code version
Compare
K
M <address1> <address2> <number of bytes>
9.1 Unlock <Unlock code>
Table 605. ISP Unlock command
Command
Input
U
Unlock code: 2313010
CMD_SUCCESS |
INVALID_CODE |
PARAM_ERROR
Return Code
Description
Example
This command is used to unlock Flash Write, Erase, and Go commands.
"U 23130<CR><LF>" unlocks the Flash Write/Erase & Go commands.
9.2 Set Baud Rate <Baud Rate> <stop bit>
Table 606. ISP Set Baud Rate command
Command
B
Input
Baud Rate: 9600 | 19200 | 38400 | 57600 | 115200 | 230400
Stop bit: 1 | 2
Return Code
CMD_SUCCESS |
INVALID_BAUD_RATE |
INVALID_STOP_BIT |
PARAM_ERROR
Description
Example
This command is used to change the baud rate. The new baud rate is effective
after the command handler sends the CMD_SUCCESS return code.
"B 57600 1<CR><LF>" sets the serial port to baud rate 57600 bps and 1 stop bit.
Table 607. Correlation between possible ISP baudrates and CCLK frequency (in MHz)
ISP Baudrate .vs.
CCLK Frequency
9600
19200
38400
57600
115200 230400
10.0000
11.0592
12.2880
14.7456[1]
15.3600
18.4320
19.6608
24.5760
25.0000
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
[1] ISP entry after reset uses the on chip IRC and PLL to run the device at CCLK = 14.748 MHz
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9.3 Echo <setting>
Table 608. ISP Echo command
Command
Input
A
Setting: ON = 1 | OFF = 0
CMD_SUCCESS |
PARAM_ERROR
Return Code
Description
Example
The default setting for echo command is ON. When ON the ISP command handler
sends the received serial data back to the host.
"A 0<CR><LF>" turns echo off.
9.4 Write to RAM <start address> <number of bytes>
The host should send the data only after receiving the CMD_SUCCESS return code. The
host should send the check-sum after transmitting 20 UU-encoded lines. The checksum is
generated by adding raw data (before UU-encoding) bytes and is reset after transmitting
20 UU-encoded lines. The length of any UU-encoded line should not exceed
61 characters(bytes) i.e. it can hold 45 data bytes. When the data fits in less then
20 UU-encoded lines then the check-sum should be of the actual number of bytes sent.
The ISP command handler compares it with the check-sum of the received bytes. If the
check-sum matches, the ISP command handler responds with "OK<CR><LF>" to
continue further transmission. If the check-sum does not match, the ISP command
handler responds with "RESEND<CR><LF>". In response the host should retransmit the
bytes.
Table 609. ISP Write to RAM command
Command
W
Input
Start Address: RAM address where data bytes are to be written. This address
should be a word boundary.
Number of Bytes: Number of bytes to be written. Count should be a multiple of 4
CMD_SUCCESS |
Return Code
ADDR_ERROR (Address not on word boundary) |
ADDR_NOT_MAPPED |
COUNT_ERROR (Byte count is not multiple of 4) |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to download data to RAM. Data should be in UU-encoded
format. This command is blocked when code read protection is enabled.
"W 1073742336 4<CR><LF>" writes 4 bytes of data to address 0x4000 0200.
9.5 Read Memory <address> <no. of bytes>
The data stream is followed by the command success return code. The check-sum is sent
after transmitting 20 UU-encoded lines. The checksum is generated by adding raw data
(before UU-encoding) bytes and is reset after transmitting 20 UU-encoded lines. The
length of any UU-encoded line should not exceed 61 characters(bytes) i.e. it can hold
45 data bytes. When the data fits in less then 20 UU-encoded lines then the check-sum is
of actual number of bytes sent. The host should compare it with the checksum of the
received bytes. If the check-sum matches then the host should respond with
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"OK<CR><LF>" to continue further transmission. If the check-sum does not match then
the host should respond with "RESEND<CR><LF>". In response the ISP command
handler sends the data again.
Table 610. ISP Read Memory command
Command
R
Input
Start Address: Address from where data bytes are to be read. This address
should be a word boundary.
Number of Bytes: Number of bytes to be read. Count should be a multiple of 4.
CMD_SUCCESS followed by <actual data (UU-encoded)> |
ADDR_ERROR (Address not on word boundary) |
ADDR_NOT_MAPPED |
Return Code
COUNT_ERROR (Byte count is not a multiple of 4) |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to read data from RAM or Flash memory. This command is
blocked when code read protection is enabled.
"R 1073741824 4<CR><LF>" reads 4 bytes of data from address 0x4000 0000.
9.6 Prepare sector(s) for write operation <start sector number> <end
sector number>
This command makes Flash write/erase operation a two step process.
Table 611. ISP Prepare sector(s) for write operation command
Command
P
Input
Start Sector Number
End Sector Number: Should be greater than or equal to start sector number.
Return Code
Description
CMD_SUCCESS |
BUSY |
INVALID_SECTOR |
PARAM_ERROR
This command must be executed before executing "Copy RAM to Flash" or
"Erase Sector(s)" command. Successful execution of the "Copy RAM to Flash" or
"Erase Sector(s)" command causes relevant sectors to be protected again. The
boot block can not be prepared by this command. To prepare a single sector use
the same "Start" and "End" sector numbers.
Example
"P 0 0<CR><LF>" prepares the Flash sector 0.
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9.7 Copy RAM to Flash <Flash address> <RAM address> <no of bytes>
Table 612. ISP Copy command
Command
C
Input
Flash Address(DST): Destination Flash address where data bytes are to be
written. The destination address should be a 256 byte boundary.
RAM Address(SRC): Source RAM address from where data bytes are to be read.
Number of Bytes: Number of bytes to be written. Should be 256 | 512 | 1024 |
4096.
Return Code CMD_SUCCESS |
SRC_ADDR_ERROR (Address not on word boundary) |
DST_ADDR_ERROR (Address not on correct boundary) |
SRC_ADDR_NOT_MAPPED |
DST_ADDR_NOT_MAPPED |
COUNT_ERROR (Byte count is not 256 | 512 | 1024 | 4096) |
SECTOR_NOT_PREPARED_FOR WRITE_OPERATION |
BUSY |
CMD_LOCKED |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to program the Flash memory. The "Prepare Sector(s) for
Write Operation" command should precede this command. The affected sectors are
automatically protected again once the copy command is successfully executed.
The boot block cannot be written by this command. This command is blocked when
code read protection is enabled.
"C 0 1073774592 512<CR><LF>" copies 512 bytes from the RAM address
0x4000 8000 to the Flash address 0.
9.8 Go <address> <mode>
Table 613. ISP Go command
Command
G
Input
Address: Flash or RAM address from which the code execution is to be started.
This address should be on a word boundary.
Mode: T (Execute program in Thumb Mode) | A (Execute program in ARM mode).
Return Code CMD_SUCCESS |
ADDR_ERROR |
ADDR_NOT_MAPPED |
CMD_LOCKED |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to execute a program residing in RAM or Flash memory. It
may not be possible to return to the ISP command handler once this command is
successfully executed. This command is blocked when code read protection is
enabled.
"G 0 A<CR><LF>" branches to address 0x0000 0000 in ARM mode.
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9.9 Erase sector(s) <start sector number> <end sector number>
Table 614. ISP Erase sector command
Command
E
Input
Start Sector Number
End Sector Number: Should be greater than or equal to start sector number.
Return Code CMD_SUCCESS |
BUSY |
INVALID_SECTOR |
SECTOR_NOT_PREPARED_FOR_WRITE_OPERATION |
CMD_LOCKED |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to erase one or more sector(s) of on-chip Flash memory.
The boot block can not be erased using this command. This command only allows
erasure of all user sectors when the code read protection is enabled.
"E 2 3<CR><LF>" erases the Flash sectors 2 and 3.
9.10 Blank check sector(s) <sector number> <end sector number>
Table 615. ISP Blank check sector command
Command
I
Input
Start Sector Number:
End Sector Number: Should be greater than or equal to start sector number.
Return Code CMD_SUCCESS |
SECTOR_NOT_BLANK (followed by <Offset of the first non blank word location>
<Contents of non blank word location>) |
INVALID_SECTOR |
PARAM_ERROR |
Description
Example
This command is used to blank check one or more sectors of on-chip Flash
memory.
Blank check on sector 0 always fails as first 64 bytes are re-mapped to Flash
boot block.
"I 2 3<CR><LF>" blank checks the Flash sectors 2 and 3.
9.11 Read Part Identification number
Table 616. ISP Read Part Identification command
Command
J
Input
None.
Description
This command is used to read the part identification number.
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Table 617. LPC24xx part Identification numbers
Device
ASCII/dec coding
352386869
Hex coding
0x1500 FF35
0x1600 FF35
0x1701 FF35
LPC2458
LPC2468
LPC2478
369164085
386006837
9.12 Read Boot code version number
Table 618. ISP Read Boot Code version number command
Command
K
Input
None
Return Code CMD_SUCCESS followed by 2 bytes of boot code version number in ASCII format.
It is to be interpreted as <byte1(Major)>.<byte0(Minor)>.
Description
This command is used to read the boot code version number.
9.13 Compare <address1> <address2> <no of bytes>
Table 619. ISP Compare command
Command
M
Input
Address1 (DST): Starting Flash or RAM address of data bytes to be compared.
This address should be a word boundary.
Address2 (SRC): Starting Flash or RAM address of data bytes to be compared.
This address should be a word boundary.
Number of Bytes: Number of bytes to be compared; should be a multiple of 4.
Return Code CMD_SUCCESS | (Source and destination data are equal)
COMPARE_ERROR | (Followed by the offset of first mismatch)
COUNT_ERROR (Byte count is not a multiple of 4) |
ADDR_ERROR |
ADDR_NOT_MAPPED |
PARAM_ERROR |
Description
Example
This command is used to compare the memory contents at two locations.
Compare result may not be correct when source or destination address
contains any of the first 64 bytes starting from address zero. First 64 bytes
are re-mapped to Flash boot sector
"M 8192 1073741824 4<CR><LF>" compares 4 bytes from the RAM address
0x4000 0000 to the 4 bytes from the Flash address 0x2000.
9.14 ISP Return Codes
Table 620. ISP Return Codes Summary
Return Mnemonic
Code
Description
0
CMD_SUCCESS
Command is executed successfully. Sent by ISP
handler only when command given by the host has
been completely and successfully executed.
1
2
INVALID_COMMAND
SRC_ADDR_ERROR
Invalid command.
Source address is not on word boundary.
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Table 620. ISP Return Codes Summary
Return Mnemonic
Description
Code
3
4
DST_ADDR_ERROR
Destination address is not on a correct boundary.
SRC_ADDR_NOT_MAPPED
Source address is not mapped in the memory map.
Count value is taken in to consideration where
applicable.
5
DST_ADDR_NOT_MAPPED
Destination address is not mapped in the memory
map. Count value is taken in to consideration
where applicable.
6
7
COUNT_ERROR
Byte count is not multiple of 4 or is not a permitted
value.
INVALID_SECTOR
Sector number is invalid or end sector number is
greater than start sector number.
8
9
SECTOR_NOT_BLANK
Sector is not blank.
SECTOR_NOT_PREPARED_FOR_ Command to prepare sector for write operation
WRITE_OPERATION
COMPARE_ERROR
BUSY
was not executed.
10
11
12
Source and destination data not equal.
Flash programming hardware interface is busy.
PARAM_ERROR
Insufficient number of parameters or invalid
parameter.
13
14
ADDR_ERROR
Address is not on word boundary.
ADDR_NOT_MAPPED
Address is not mapped in the memory map. Count
value is taken in to consideration where applicable.
15
16
17
18
19
CMD_LOCKED
Command is locked.
INVALID_CODE
Unlock code is invalid.
Invalid baud rate setting.
Invalid stop bit setting.
Code read protection enabled.
INVALID_BAUD_RATE
INVALID_STOP_BIT
CODE_READ_PROTECTION_
ENABLED
10. IAP commands
For in application programming the IAP routine should be called with a word pointer in
register r0 pointing to memory (RAM) containing command code and parameters. Result
of the IAP command is returned in the result table pointed to by register r1. The user can
reuse the command table for result by passing the same pointer in registers r0 and r1. The
parameter table should be big enough to hold all the results in case if number of results
are more than number of parameters. Parameter passing is illustrated in the
Figure 30–140. The number of parameters and results vary according to the IAP
command. The maximum number of parameters is 5, passed to the "Copy RAM to
FLASH" command. The maximum number of results is 2, returned by the "Blankcheck
sector(s)" command. The command handler sends the status code INVALID_COMMAND
when an undefined command is received. The IAP routine resides at 0x7FFF FFF0
location and it is thumb code.
The IAP function could be called in the following way using C.
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Define the IAP location entry point. Since the 0th bit of the IAP location is set there will be
a change to Thumb instruction set when the program counter branches to this address.
#define IAP_LOCATION 0x7ffffff1
Define data structure or pointers to pass IAP command table and result table to the IAP
function:
unsigned long command[5];
unsigned long result[3];
or
unsigned long * command;
unsigned long * result;
command=(unsigned long *) 0x……
result= (unsigned long *) 0x……
Define pointer to function type, which takes two parameters and returns void. Note the IAP
returns the result with the base address of the table residing in R1.
typedef void (*IAP)(unsigned int [],unsigned int[]);
IAP iap_entry;
Setting function pointer:
iap_entry=(IAP) IAP_LOCATION;
Whenever you wish to call IAP you could use the following statement.
iap_entry (command, result);
The IAP call could be simplified further by using the symbol definition file feature
supported by ARM Linker in ADS (ARM Developer Suite). You could also call the IAP
routine using assembly code.
The following symbol definitions can be used to link IAP routine and user application:
#<SYMDEFS># ARM Linker, ADS1.2 [Build 826]: Last Updated: Wed May 08 16:12:23 2002
0x7fffff90 T rm_init_entry
0x7fffffa0 A rm_undef_handler
0x7fffffb0 A rm_prefetchabort_handler
0x7fffffc0 A rm_dataabort_handler
0x7fffffd0 A rm_irqhandler
0x7fffffe0 A rm_irqhandler2
0x7ffffff0 T iap_entry
As per the ARM specification (The ARM Thumb Procedure Call Standard SWS ESPC
0002 A-05) up to 4 parameters can be passed in the r0, r1, r2 and r3 registers
respectively. Additional parameters are passed on the stack. Up to 4 parameters can be
returned in the r0, r1, r2 and r3 registers respectively. Additional parameters are returned
indirectly via memory. Some of the IAP calls require more than 4 parameters. If the ARM
suggested scheme is used for the parameter passing/returning then it might create
problems due to difference in the C compiler implementation from different vendors. The
suggested parameter passing scheme reduces such risk.
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The Flash memory is not accessible during a write or erase operation. IAP commands,
which results in a Flash write/erase operation, use 32 bytes of space in the top portion of
the on-chip RAM for execution. The user program should not be use this space if IAP
Flash programming is permitted in the application.
Table 621. IAP Command Summary
IAP Command
Command Code
Described in
Prepare sector(s) for write operation
Copy RAM to Flash
Erase sector(s)
5010
5110
5210
5310
5410
5510
5610
5710
Blank check sector(s)
Read Part ID
Read Boot code version
Compare
Reinvoke ISP
COMMAND CODE
PARAMETER 1
PARAMETER 2
command
parameter table
ARM REGISTER r0
ARM REGISTER r1
PARAMETER n
STATUS CODE
RESULT 1
command
result table
RESULT 2
RESULT n
Fig 140. IAP parameter passing
10.1 Prepare sector(s) for write operation
This command makes Flash write/erase operation a two step process.
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Table 622. IAP Prepare sector(s) for write operation command
Command Prepare sector(s) for write operation
Input
Command code: 5010
Param0: Start Sector Number
Param1: End Sector Number (should be greater than or equal to start sector
number).
Return Code
CMD_SUCCESS |
BUSY |
INVALID_SECTOR
None
Result
Description
This command must be executed before executing "Copy RAM to Flash" or
"Erase Sector(s)" command. Successful execution of the "Copy RAM to Flash" or
"Erase Sector(s)" command causes relevant sectors to be protected again. The
boot sector can not be prepared by this command. To prepare a single sector use
the same "Start" and "End" sector numbers.
10.2 Copy RAM to Flash
Table 623. IAP Copy RAM to Flash command
Command
Copy RAM to Flash
Command code: 5110
Input
Param0(DST): Destination Flash address where data bytes are to be written. This
address should be a 256 byte boundary.
Param1(SRC): Source RAM address from which data bytes are to be read. This
address should be a word boundary.
Param2: Number of bytes to be written. Should be 256 | 512 | 1024 | 4096.
Param3: System Clock Frequency (CCLK) in kHz.
CMD_SUCCESS |
Return Code
SRC_ADDR_ERROR (Address not a word boundary) |
DST_ADDR_ERROR (Address not on correct boundary) |
SRC_ADDR_NOT_MAPPED |
DST_ADDR_NOT_MAPPED |
COUNT_ERROR (Byte count is not 256 | 512 | 1024 | 4096) |
SECTOR_NOT_PREPARED_FOR_WRITE_OPERATION |
BUSY |
Result
None
Description
This command is used to program the Flash memory. The affected sectors should
be prepared first by calling "Prepare Sector for Write Operation" command. The
affected sectors are automatically protected again once the copy command is
successfully executed. The boot sector can not be written by this command.
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10.3 Erase Sector(s)
Table 624. IAP Erase Sector(s) command
Command
Erase Sector(s)
Input
Command code: 5210
Param0: Start Sector Number
Param1: End Sector Number (should be greater than or equal to start sector
number).
Param2: System Clock Frequency (CCLK) in kHz.
Return Code
CMD_SUCCESS |
BUSY |
SECTOR_NOT_PREPARED_FOR_WRITE_OPERATION |
INVALID_SECTOR
None
Result
Description
This command is used to erase a sector or multiple sectors of on-chip Flash
memory. The boot sector can not be erased by this command. To erase a single
sector use the same "Start" and "End" sector numbers.
10.4 Blank check sector(s)
Table 625. IAP Blank check sector(s) command
Command
Blank check sector(s)
Command code: 5310
Input
Param0: Start Sector Number
Param1: End Sector Number (should be greater than or equal to start sector
number).
Return Code
CMD_SUCCESS |
BUSY |
SECTOR_NOT_BLANK |
INVALID_SECTOR
Result
Result0: Offset of the first non blank word location if the Status Code is
SECTOR_NOT_BLANK.
Result1: Contents of non blank word location.
Description
This command is used to blank check a sector or multiple sectors of on-chip Flash
memory. To blank check a single sector use the same "Start" and "End" sector
numbers.
10.5 Read Part Identification number
Table 626. IAP Read Part Identification command
Command
Read part identification number
Command code: 5410
Input
Parameters: None
Return Code
Result
CMD_SUCCESS |
Result0: Part Identification Number.
This command is used to read the part identification number.
Description
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10.6 Read Boot code version number
Table 627. IAP Read Boot Code version number command
Command
Read boot code version number
Command code: 5510
Parameters: None
Input
Return Code
Result
CMD_SUCCESS |
Result0: 2 bytes of boot code version number in ASCII format. It is to be
interpreted as <byte1(Major)>.<byte0(Minor)>
Description
This command is used to read the boot code version number.
10.7 Compare <address1> <address2> <no of bytes>
Table 628. IAP Compare command
Command
Compare
Input
Command code: 5610
Param0(DST): Starting Flash or RAM address of data bytes to be compared. This
address should be a word boundary.
Param1(SRC): Starting Flash or RAM address of data bytes to be compared. This
address should be a word boundary.
Param2: Number of bytes to be compared; should be a multiple of 4.
CMD_SUCCESS |
Return Code
COMPARE_ERROR |
COUNT_ERROR (Byte count is not a multiple of 4) |
ADDR_ERROR |
ADDR_NOT_MAPPED
Result
Result0: Offset of the first mismatch if the Status Code is COMPARE_ERROR.
This command is used to compare the memory contents at two locations.
Description
The result may not be correct when the source or destination includes any
of the first 64 bytes starting from address zero. The first 64 bytes can be
re-mapped to RAM.
10.8 Reinvoke ISP
Table 629. Reinvoke ISP
Command
Compare
Input
Command code: 5710
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Table 629. Reinvoke ISP
Command
Compare
None
Return Code
Result
None.
Description
This command is used to invoke the bootloader in ISP mode. It maps boot
vectors, sets PCLK = CCLK / 4, configures UART0 pins Rx and Tx, restets
used when a valid user program is present in the internal Flash memory and the
P2.10 pin is not accessible to force the ISP mode. The command does not disable
the PLL hence it is possible to invoke the bootloader when the part is running off
the PLL. In such case the ISP utility should pass the CCLK (crystal or PLL output
autobaud handshake.
Another option is to disable the PLL and select the IRC as the clock source before
making this IAP call. In this case frequency sent by ISP is ignored and IRC and
PLL are used to generate CCLK = 14.748 MHz.
10.9 IAP Status Codes
Table 630. IAP Status Codes Summary
Status Mnemonic
Code
Description
0
1
2
3
4
CMD_SUCCESS
Command is executed successfully.
Invalid command.
INVALID_COMMAND
SRC_ADDR_ERROR
DST_ADDR_ERROR
SRC_ADDR_NOT_MAPPED
Source address is not on a word boundary.
Destination address is not on a correct boundary.
Source address is not mapped in the memory map.
Count value is taken in to consideration where
applicable.
5
6
DST_ADDR_NOT_MAPPED
COUNT_ERROR
Destination address is not mapped in the memory
map. Count value is taken in to consideration where
applicable.
Byte count is not multiple of 4 or is not a permitted
value.
7
8
9
INVALID_SECTOR
Sector number is invalid.
Sector is not blank.
SECTOR_NOT_BLANK
SECTOR_NOT_PREPARED_
FOR_WRITE_OPERATION
Command to prepare sector for write operation was
not executed.
10
11
COMPARE_ERROR
BUSY
Source and destination data is not same.
Flash programming hardware interface is busy.
11. JTAG Flash programming interface
Debug tools can write parts of the Flash image to the RAM and then execute the IAP call
"Copy RAM to Flash" repeatedly with proper offset.
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1. How to read this chapter
Remark: This chapter describes the boot process for flashless parts LPC2420/60 and
LPC2470. It does not apply to parts LPC2458, LPC2468, and LPC2478.
The on-chip bootloader version 3.4 controls the boot process for flashless LPC2400 parts
LPC2420/60 and LPC2470.
2. Features
• In-System Programming: In-System programming (ISP) is programming or
reprogramming the on-chip memory, using the boot loader software and UART0 serial
port. This can be done when the part resides in the end-user board.
• In Application Programming: In-Application (IAP) programming is performing erase
and write operation on the on-chip memory, as directed by the end-user application
code.
3. Applications
The boot loader provides both In-System and In-Application programming interfaces for
programming the on-chip memory.
4. Description
The bootloader is designed as a tool that enables the user to load system specific
application for further programming of in system available off-chip Flash and/or RAM
resources. The bootloader itself does not contain any external memory programming
algorithms. The bootloader implemented in LPC2460/70 supports a limited set of
commands dedicated to code download and its execution from on-chip RAM only. UART0
is the sole serial channel the boot loader can use for data download. Although a fractional
divider is available in the UART0, it is not used by the on-chip bootloader.
The boot loader code is executed every time the part is powered on or reset. The loader
can execute the ISP command handler or the user application code. A LOW level after
reset at the P2.10 pin is considered as an external hardware request to start the ISP
command handler. Assuming that power supply pins are on their nominal levels when the
rising edge on RESET pin is generated, it may take up to 3 ms before P2.10 is sampled
and the decision on whether to continue with user code or ISP handler is made. If P2.10 is
sampled low and the watchdog overflow flag is set, the external hardware request to start
the ISP command handler is ignored. If there is no request for the ISP command handler
execution (P2.10 is sampled HIGH after reset), a search is made for a valid user program.
If a valid user program is found then the execution control is transferred to it. If a valid user
program is not found, the auto-baud routine is invoked.
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Pin P2.10 that is used as hardware request for ISP requires special attention. Since P2.10
is in high impedance mode after reset, it is important that the user provides external
hardware (a pull-up resistor or other device) to put the pin in a defined state. Otherwise
unintended entry into ISP mode may occur.
When ISP mode is entered after a power on reset, the IRC and PLL are used to generate
CCLK of 14.748 MHz.
4.1 Memory map after any reset
The boot loader resides in an on-chip ROM sector of 8 kB in size. After any reset the
entire boot sector is also mapped to the top of the on-chip memory space i.e. the boot
block is also visible in the memory region starting from the address 0x7FFF E000. The
serial boot loader is designed to run from this memory area, and both the ISP and IAP
software use parts of the on-chip RAM. The RAM usage is described later in this chapter.
In addition, the bottom 64 byte of the ROM boot sector are also visible in the memory
region starting from address 0x0000 0000, i.e. the interrupt vectors are mapped to the
boot ROM sector. The reset vector contains a jump instruction to the entry point of the
serial boot loader software.
0x7FFF FFFF
0x7FFF E000
2.0 GB
8 kB BOOT BLOCK
(BOOT BLOCK INTERRUPT VECTORS)
2.0 GB - 8 kB
ACTIVE INTERRUPT VECTORS
FROM THE BOOT BLOCK
0.0 GB
0x0000 0000
Fig 141. Map of lower memory after reset for flashless LPC2400 parts
4.2 Communication protocol
All ISP commands should be sent as single ASCII strings. Strings should be terminated
with Carriage Return (CR) and/or Line Feed (LF) control characters. Extra <CR> and
<LF> characters are ignored. All ISP responses are sent as <CR><LF> terminated ASCII
strings. Data is sent and received in UU-encoded format.
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4.2.1 ISP command format
"Command Parameter_0 Parameter_1 ... Parameter_n<CR><LF>" "Data" (Data only for
Write commands).
4.2.2 ISP response format
"Return_Code<CR><LF>Response_0<CR><LF>Response_1<CR><LF> ...
Response_n<CR><LF>" "Data" (Data only for Read commands).
4.2.3 ISP data format
The data stream is in UU-encode format. The UU-encode algorithm converts 3 bytes of
binary data in to 4 bytes of printable ASCII character set. It is more efficient than Hex
format which converts 1 byte of binary data in to 2 bytes of ASCII hex. The sender should
send the check-sum after transmitting 20 UU-encoded lines. The length of any
UU-encoded line should not exceed 61 characters(bytes) i.e. it can hold 45 data bytes.
The receiver should compare it with the check-sum of the received bytes. If the
check-sum matches then the receiver should respond with "OK<CR><LF>" to continue
further transmission. If the check-sum does not match the receiver should respond with
"RESEND<CR><LF>". In response the sender should retransmit the bytes.
A description of UU-encode is available at the wotsit webpage.
4.2.4 ISP flow control
A software XON/XOFF flow control scheme is used to prevent data loss due to buffer
overrun. When the data arrives rapidly, the ASCII control character DC3 (stop) is sent to
stop the flow of data. Data flow is resumed by sending the ASCII control character DC1
(start). The host should also support the same flow control scheme.
4.2.5 ISP command abort
Commands can be aborted by sending the ASCII control character "ESC". This feature is
not documented as a command under "ISP Commands" section. Once the escape code is
received the ISP command handler waits for a new command.
4.2.6 Interrupts during ISP
The boot block interrupt vectors located in the boot ROM sector are active after any reset.
4.2.7 Interrupts during IAP
IAP calls can be interrupted and an adequate interrupt service routine can be executed if
interrupts are enabled. For details on how the address for an interrupt service routine will
4.2.8 RAM used by ISP command handler
ISP commands use on-chip RAM from 0x4000 0120 to 0x4000 01FF. The user could use
this area, but the contents may be lost upon reset. The ROM boot loader also uses the top
32 bytes of on-chip RAM. The stack is located at RAM top - 32. The maximum stack
usage is 256 bytes and grows downwards.
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4.2.9 RAM used by IAP command handler
IAP programming commands use the top 32 bytes of on-chip RAM. The maximum stack
usage in the user allocated stack space is 128 bytes and it grows downwards.
4.2.10 RAM used by RealMonitor
The RealMonitor uses on-chip RAM from 0x4000 0040 to 0x4000 011F. The user could
use this area if RealMonitor based debug is not required. The serial boot loader does not
initialize the stack for RealMonitor.
5. Boot process flowchart
RESET
INITIALIZE
Yes
WATCHDOG
FLAG SET?
No
EXECUTE EXTERNAL
USER CODE
No
ENTER ISP
MODE?
(P2.10 LOW?)
Yes
RUN AUTO-BAUD
No
AUTO-BAUD
SUCCESSFUL?
Yes
RECEIVE CRYSTAL
(1)
FREQUENCY
Fig 142. Boot process flowchart
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6. ISP commands
The following commands are accepted by the ISP command handler. Detailed status
codes are supported for each command. The command handler sends the return code
INVALID_COMMAND when an undefined command is received. Commands and return
codes are in ASCII format.
CMD_SUCCESS is sent by ISP command handler only when received ISP command has
been completely executed and the new ISP command can be given by the host.
Exceptions from this rule are "Set Baud Rate", "Write to RAM", "Read Memory", and "Go"
commands.
Table 631. ISP command summary
ISP Command
Unlock
Usage
Described in
U <Unlock Code>
Set Baud Rate
Echo
B <Baud Rate> <stop bit>
A <setting>
Write to RAM
Read Memory
Go
W <start address> <number of bytes>
R <address> <number of bytes>
G <address> <Mode>
Read Part ID
Read Boot code version
Compare
J
K
M <address1> <address2> <number of bytes>
6.1 Unlock <Unlock code>
Table 632. ISP Unlock command
Command
Input
U
Unlock code: 2313010
Return Code
CMD_SUCCESS |
INVALID_CODE |
PARAM_ERROR
Description
Example
This command is used to unlock the Go command.
"U 23130<CR><LF>" unlocks the Go command.
6.2 Set Baud Rate <Baud Rate> <stop bit>
Table 633. ISP Set Baud Rate command
Command
B
Input
Baud Rate: 9600 | 19200 | 38400 | 57600 | 115200 | 230400
Stop bit: 1 | 2
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Table 633. ISP Set Baud Rate command
Command
B
Return Code
CMD_SUCCESS |
INVALID_BAUD_RATE |
INVALID_STOP_BIT |
PARAM_ERROR
Description
Example
This command is used to change the baud rate. The new baud rate is effective
after the command handler sends the CMD_SUCCESS return code.
"B 57600 1<CR><LF>" sets the serial port to baud rate 57600 bps and 1 stop bit.
Table 634. Correlation between possible ISP baudrates and CCLK frequency (in MHz)
ISP Baudrate .vs.
CCLK Frequency
9600
19200
38400
57600
115200 230400
10.0000
11.0592
12.2880
14.7456[1]
15.3600
18.4320
19.6608
24.5760
25.0000
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
[1] ISP entry after reset uses the on chip IRC and PLL to run the device at CCLK = 14.748 MHz
6.3 Echo <setting>
Table 635. ISP Echo command
Command
Input
A
Setting: ON = 1 | OFF = 0
CMD_SUCCESS |
PARAM_ERROR
Return Code
Description
Example
The default setting for echo command is ON. When ON the ISP command handler
sends the received serial data back to the host.
"A 0<CR><LF>" turns echo off.
6.4 Write to RAM <start address> <number of bytes>
The host should send the data only after receiving the CMD_SUCCESS return code. The
host should send the check-sum after transmitting 20 UU-encoded lines. The checksum is
generated by adding raw data (before UU-encoding) bytes and is reset after transmitting
20 UU-encoded lines. The length of any UU-encoded line should not exceed
61 characters(bytes) i.e. it can hold 45 data bytes. When the data fits in less then
20 UU-encoded lines then the check-sum should be of the actual number of bytes sent.
The ISP command handler compares it with the check-sum of the received bytes. If the
check-sum matches, the ISP command handler responds with "OK<CR><LF>" to
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continue further transmission. If the check-sum does not match, the ISP command
handler responds with "RESEND<CR><LF>". In response the host should retransmit the
bytes.
Table 636. ISP Write to RAM command
Command
W
Input
Start Address: RAM address where data bytes are to be written. This address
should be a word boundary.
Number of Bytes: Number of bytes to be written. Count should be a multiple of 4
CMD_SUCCESS |
Return Code
ADDR_ERROR (Address not on word boundary) |
ADDR_NOT_MAPPED |
COUNT_ERROR (Byte count is not multiple of 4) |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to download data to RAM. Data should be in UU-encoded
format. This command is blocked when code read protection is enabled.
"W 1073742336 4<CR><LF>" writes 4 bytes of data to address 0x4000 0200.
6.5 Read Memory <address> <no. of bytes>
The data stream is followed by the command success return code. The check-sum is sent
after transmitting 20 UU-encoded lines. The checksum is generated by adding raw data
(before UU-encoding) bytes and is reset after transmitting 20 UU-encoded lines. The
length of any UU-encoded line should not exceed 61 characters(bytes) i.e. it can hold
45 data bytes. When the data fits in less then 20 UU-encoded lines then the check-sum is
of actual number of bytes sent. The host should compare it with the checksum of the
received bytes. If the check-sum matches then the host should respond with
"OK<CR><LF>" to continue further transmission. If the check-sum does not match then
the host should respond with "RESEND<CR><LF>". In response the ISP command
handler sends the data again.
Table 637. ISP Read Memory command
Command
R
Input
Start Address: Address from where data bytes are to be read. This address
should be a word boundary.
Number of Bytes: Number of bytes to be read. Count should be a multiple of 4.
CMD_SUCCESS followed by <actual data (UU-encoded)> |
ADDR_ERROR (Address not on word boundary) |
ADDR_NOT_MAPPED |
Return Code
COUNT_ERROR (Byte count is not a multiple of 4) |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to read data from RAM.
"R 1073741824 4<CR><LF>" reads 4 bytes of data from address 0x4000 0000.
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6.6 Go <address> <mode>
Table 638. ISP Go command
Command
G
Input
Address: RAM address from which the code execution is to be started. This
address should be on a word boundary.
Mode: T (Execute program in Thumb Mode) | A (Execute program in ARM mode).
Return Code CMD_SUCCESS |
ADDR_ERROR |
ADDR_NOT_MAPPED |
CMD_LOCKED |
PARAM_ERROR |
CODE_READ_PROTECTION_ENABLED
Description
Example
This command is used to execute a program residing in RAM memory. It may not
be possible to return to the ISP command handler once this command is
successfully executed.
"G 0 A<CR><LF>" branches to address 0x0000 0000 in ARM mode.
6.7 Read Part Identification number
Table 639. ISP Read Part Identification command
Command
J
Input
None.
Description
This command is used to read the part identification number.
Table 640. LPC24xx part Identification numbers
Device
ASCII/dec coding
302049073
Hex coding
0x1200 E731
0x1600 FF30
0x1701 FF30
LPC2420
LPC2460
LPC2470
369164080
386006832
6.8 Read Boot code version number
Table 641. ISP Read Boot Code version number command
Command
K
Input
None
Return Code CMD_SUCCESS followed by 2 bytes of boot code version number in ASCII format.
It is to be interpreted as <byte1(Major)>.<byte0(Minor)>.
Description
This command is used to read the boot code version number.
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6.9 Compare <address1> <address2> <no of bytes>
Table 642. ISP Compare command
Command
M
Input
Address1 (DST): Starting RAM address of data bytes to be compared. This
address should be a word boundary.
Address2 (SRC): StartingRAM address of data bytes to be compared. This
address should be a word boundary.
Number of Bytes: Number of bytes to be compared; should be a multiple of 4.
Return Code CMD_SUCCESS | (Source and destination data are equal)
COMPARE_ERROR | (Followed by the offset of first mismatch)
COUNT_ERROR (Byte count is not a multiple of 4) |
ADDR_ERROR |
ADDR_NOT_MAPPED |
PARAM_ERROR |
Description
Example
This command is used to compare the memory contents at two locations.
Compare result may not be correct when source or destination address
contains any of the first 64 bytes starting from address zero. After any reset,
the first 64 bytes are re-mapped to the ROM boot sector
"M 1073742336 1073741824 4<CR><LF>" compares 4 bytes from the RAM
address 0x4000 0000 to the 4 bytes from the RAM address 0x4000 0200.
6.10 ISP Return Codes
Table 643. ISP Return Codes Summary
Return Mnemonic
Code
Description
0
CMD_SUCCESS
Command is executed successfully. Sent by ISP
handler only when command given by the host has
been completely and successfully executed.
1
2
3
4
INVALID_COMMAND
SRC_ADDR_ERROR
DST_ADDR_ERROR
SRC_ADDR_NOT_MAPPED
Invalid command.
Source address is not on word boundary.
Destination address is not on a correct boundary.
Source address is not mapped in the memory map.
Count value is taken in to consideration where
applicable.
5
6
DST_ADDR_NOT_MAPPED
COUNT_ERROR
Destination address is not mapped in the memory
map. Count value is taken in to consideration
where applicable.
Byte count is not multiple of 4 or is not a permitted
value.
7:9
10
11
-
not used
COMPARE_ERROR
BUSY
Source and destination data not equal.
Programming hardware interface is busy.
12
PARAM_ERROR
Insufficient number of parameters or invalid
parameter.
13
ADDR_ERROR
Address is not on word boundary.
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Table 643. ISP Return Codes Summary
Return Mnemonic
Description
Code
14
ADDR_NOT_MAPPED
Address is not mapped in the memory map. Count
value is taken in to consideration where applicable.
15
16
17
18
19
CMD_LOCKED
INVALID_CODE
INVALID_BAUD_RATE
INVALID_STOP_BIT
-
Command is locked.
Unlock code is invalid.
Invalid baud rate setting.
Invalid stop bit setting.
not used
7. IAP commands
For in application programming the IAP routine should be called with a word pointer in
register r0 pointing to memory (RAM) containing command code and parameters. Result
of the IAP command is returned in the result table pointed to by register r1. The user can
reuse the command table for result by passing the same pointer in registers r0 and r1. The
parameter table should be big enough to hold all the results in case if number of results
are more than number of parameters. Parameter passing is illustrated in the
Figure 31–143. The number of parameters and results vary according to the IAP
command. The maximum number of parameters is 3, passed to the "Compare" command.
The maximum number of results is 1, returned by all three available IAP commands. The
command handler sends the status code INVALID_COMMAND when an undefined
command is received. The IAP routine resides at 0x7FFF FFF0 location and it is thumb
code.
The IAP function could be called in the following way using C.
Define the IAP location entry point. Since the 0th bit of the IAP location is set there will be
a change to Thumb instruction set when the program counter branches to this address.
#define IAP_LOCATION 0x7ffffff1
Define data structure or pointers to pass IAP command table and result table to the IAP
function:
unsigned long command[5];
unsigned long result[3];
or
unsigned long * command;
unsigned long * result;
command=(unsigned long *) 0x……
result= (unsigned long *) 0x……
Define pointer to function type, which takes two parameters and returns void. Note the IAP
returns the result with the base address of the table residing in R1.
typedef void (*IAP)(unsigned int [],unsigned int[]);
IAP iap_entry;
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Setting function pointer:
iap_entry=(IAP) IAP_LOCATION;
Whenever you wish to call IAP you could use the following statement.
iap_entry (command, result);
The IAP call could be simplified further by using the symbol definition file feature
supported by ARM Linker in ADS (ARM Developer Suite). You could also call the IAP
routine using assembly code.
The following symbol definitions can be used to link IAP routine and user application:
#<SYMDEFS># ARM Linker, ADS1.2 [Build 826]: Last Updated: Wed May 08 16:12:23 2002
0x7fffff90 T rm_init_entry
0x7fffffa0 A rm_undef_handler
0x7fffffb0 A rm_prefetchabort_handler
0x7fffffc0 A rm_dataabort_handler
0x7fffffd0 A rm_irqhandler
0x7fffffe0 A rm_irqhandler2
0x7ffffff0 T iap_entry
As per the ARM specification (The ARM Thumb Procedure Call Standard SWS ESPC
0002 A-05) up to 4 parameters can be passed in the r0, r1, r2 and r3 registers
respectively. Additional parameters are passed on the stack. Up to 4 parameters can be
returned in the r0, r1, r2 and r3 registers respectively. Additional parameters are returned
indirectly via memory. Some of the IAP calls require more than 4 parameters. If the ARM
suggested scheme is used for the parameter passing/returning then it might create
problems due to difference in the C compiler implementation from different vendors. The
suggested parameter passing scheme reduces such risk.
Table 644. IAP Command Summary
IAP Command
Read Part ID
Command Code
Described in
5410
5510
5610
5710
Read Boot code version
Compare
Reinvoke ISP
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COMMAND CODE
command
PARAMETER 1
parameter table
PARAMETER 2
ARM REGISTER r0
ARM REGISTER r1
PARAMETER n
STATUS CODE
RESULT 1
command
result table
RESULT 2
RESULT n
Fig 143. IAP parameter passing
7.1 Read Part Identification number
Table 645. IAP Read Part Identification command
Command
Read part identification number
Command code: 5410
Input
Parameters: None
Return Code
Result
CMD_SUCCESS |
Result0: Part Identification Number.
Description
This command is used to read the part identification number.
7.2 Read Boot code version number
Table 646. IAP Read Boot Code version number command
Command
Read boot code version number
Command code: 5510
Parameters: None
Input
Return Code
Result
CMD_SUCCESS |
Result0: 2 bytes of boot code version number in ASCII format. It is to be
interpreted as <byte1(Major)>.<byte0(Minor)>
Description
This command is used to read the boot code version number.
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7.3 Compare <address1> <address2> <no of bytes>
Table 647. IAP Compare command
Command
Compare
Input
Command code: 5610
Param0(DST): Starting RAM address of data bytes to be compared. This address
should be a word boundary.
Param1(SRC): Starting RAM address of data bytes to be compared. This address
should be a word boundary.
Param2: Number of bytes to be compared; should be a multiple of 4.
CMD_SUCCESS |
Return Code
COMPARE_ERROR |
COUNT_ERROR (Byte count is not a multiple of 4) |
ADDR_ERROR |
ADDR_NOT_MAPPED
Result
Result0: Offset of the first mismatch if the Status Code is COMPARE_ERROR.
This command is used to compare the memory contents at two locations.
Description
The result may not be correct when the source or destination includes any
of the first 64 bytes starting from address zero. The first 64 bytes can be
re-mapped to RAM.
7.4 Reinvoke ISP
Table 648. Reinvoke ISP
Command
Input
Compare
Command code: 5710
None
Return Code
Result
None.
Description
This command is used to invoke the bootloader in ISP mode. It maps boot
vectors, sets PCLK = CCLK / 4, configures UART0 pins Rx and Tx, resets
used when a valid user program is present in the external memory and the P2.10
pin is not accessible to force the ISP mode. The command does not disable the
PLL hence it is possible to invoke the bootloader when the part is running off the
PLL. In such case the ISP utility should pass the CCLK (crystal or PLL output
autobaud handshake.
Another option is to disable the PLL and select the IRC as the clock source before
making this IAP call. In this case frequency sent by ISP is ignored and IRC and
PLL are used to generate CCLK = 14.748 MHz.
7.5 IAP Status Codes
Table 649. IAP Status Codes Summary
Status Mnemonic
Code
Description
0
1
2
CMD_SUCCESS
Command is executed successfully.
Invalid command.
INVALID_COMMAND
SRC_ADDR_ERROR
Source address is not on a word boundary.
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Table 649. IAP Status Codes Summary
Status Mnemonic
Description
Code
3
4
DST_ADDR_ERROR
Destination address is not on a correct boundary.
SRC_ADDR_NOT_MAPPED
Source address is not mapped in the memory map.
Count value is taken in to consideration where
applicable.
5
6
DST_ADDR_NOT_MAPPED
COUNT_ERROR
Destination address is not mapped in the memory
map. Count value is taken in to consideration where
applicable.
Byte count is not multiple of 4 or is not a permitted
value.
7:9
10
11
-
Not used.
COMPARE_ERROR
BUSY
Source and destination data is not same.
Programming hardware interface is busy.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA)
controller
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User manual
1. Basic configuration
The GPDMA is configured using the following registers:
Remark: On reset, the GPDMA is disabled (PCGPDMA = 0).
2. Introduction
The General Purpose DMA Controller (GPDMA) is an AMBA AHB compliant peripheral
allowing selected LPC2400 peripherals to have DMA support.
3. Features of the GPDMA
• Two DMA channels. Each channel can support a unidirectional transfer.
• The GPDMA provides 16 peripheral DMA request lines. Some of these are connected
to peripheral functions that support DMA: the SD/MMC, two SSP, and I2S interfaces.
• Single DMA and burst DMA request signals. Each peripheral connected to the
GPDMA can assert either a burst DMA request or a single DMA request. The DMA
burst size is set by programming the GPDMA.
• Memory-to-memory, memory-to-peripheral, peripheral-to-memory, and
peripheral-to-peripheral transfers.
• Scatter or gather DMA is supported through the use of linked lists. This means that
the source and destination areas do not have to occupy contiguous areas of memory.
• Hardware DMA channel priority. Each DMA channel has a specific hardware priority.
DMA channel 0 has the highest priority and channel 1 has the lowest priority. If
requests from two channels become active at the same time the channel with the
highest priority is serviced first.
• AHB slave DMA programming interface. The GPDMA is programmed by writing to the
DMA control registers over the AHB slave interface.
• One AHB bus master for transferring data. This interface transfers data when a DMA
request goes active.
• 32-bit AHB master bus width.
• Incrementing or non-incrementing addressing for source and destination.
• Programmable DMA burst size. The DMA burst size can be programmed to more
efficiently transfer data. Usually the burst size is set to half the size of the FIFO in the
peripheral.
• Internal four-word FIFO per channel.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
• Supports 8, 16, and 32 bit wide transactions.
• Big-endian and little-endian support. The GPDMA defaults to little-endian mode on
reset.
• An interrupt to the processor can be generated on a DMA completion or when a DMA
error has occurred.
• Interrupt masking. The DMA error and DMA terminal count interrupt requests can be
masked.
• Raw interrupt status. The DMA error and DMA count raw interrupt status can be read
prior to masking.
• Test registers for use in block and integration system level testing.
• Identification registers that uniquely identify the GPDMA. These can be used by an
operating system to automatically configure itself.
4. Functional overview
This chapter describes the major functional blocks of the GPDMA. It contains the following
sections:
• GPDMA functional description
• System considerations
• System connectivity
• Use with memory management unit based systems
4.1 Memory regions accessible by the GPDMA
Table 650. GPDMA accessible memory
Memory region
On-chip RAM
Address range
Memory Type
0x7FD0 0000 - 0x7FD0 3FFF
USB RAM (16 kB)
Off-Chip Memory
Four static memory banks, 16 MB each
0x8000 0000 - 0x80FF FFFF
0x8100 0000 - 0x81FF FFFF
0x8200 0000 - 0x82FF FFFF
0x8300 0000 - 0x83FF FFFF
Static memory bank 0
Static memory bank 1
Static memory bank 2
Static memory bank 3
Four dynamic memory banks, 256 MB each
0xA000 0000 - 0xAFFF FFFF
0xB000 0000 - 0xBFFF FFFF
Dynamic memory bank 0
Dynamic memory bank 1
0xC000 0000 - 0xCFFF FFFF Dynamic memory bank 2
0xD000 0000 - 0xDFFF FFFF Dynamic memory bank 3
4.2 GPDMA functional description
The GPDMA enables peripheral-to-memory, memory-to-peripheral,
peripheral-to-peripheral, and memory-to-memory transactions. Each DMA stream
provides unidirectional serial DMA transfers for a single source and destination. For
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
example, a bidirectional port requires one stream for transmit and one for receive. The
source and destination areas can each be either a memory region or a peripheral, and
can be accessed through the AHB master.
Figure 32–144 shows a block diagram of the GPDMA.
GPDMA
CONTROL
LOGIC AND
REGISTERS
AHB SLAVE
INTERFACE
AHB BUS
DMA
requests
DMA
REQUEST
AND
RESPONSE
INTERFACE
CHANNEL
LOGIC AND
REGISTERS
AHB
MASTER
INTERFACE
DMA
responses
AHB BUS
DMA
Interrupts
INTERRUPT
REQUEST
Fig 144. GPDMA block diagram
The functions of the GPDMA are described in the following sections:
• AHB slave interface
• Control logic and register bank
• DMA request and response interface
• Channel logic and channel register bank
• Interrupt request
• AHB master interface
• Channel hardware
• DMA request priority
4.2.1 AHB Slave Interface
All transactions on the AHB slave programming bus of the GPDMA are 32 bit wide.
4.2.2 Control Logic and Register Bank
The register block stores data written, or to be read across the AHB interface.
4.2.3 DMA Request and Response Interface
See DMA Interface description for information on the DMA request and response
interface.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
4.2.4 Channel Logic and Channel Register Bank
The channel logic and channel register bank contains registers and logic required for each
DMA channel.
4.2.5 Interrupt Request
The interrupt request generates interrupts to the ARM processor.
4.2.6 AHB Master Interface
GPDMA connected into a system.
ARM
GPDMA
AHB
SLAVE
AHB
MASTER
AHB
BRIDGE
UART
EXTERNAL
MEMORY
CONTROLLER
EXTERNAL
MEMORY
APB
BRIDGE
TIMER
GPIO
AHB
PERIPHERAL
INTERNAL
SRAM
Fig 145. Example of GPDMA in a system
The AHB master is capable of dealing with all types of AHB transactions, including:
• Split, retry, and error responses from slaves. If a peripheral performs a split or retry,
the GPDMA stalls and waits until the transaction can complete.
• Locked transfers for source and destination of each stream.
• Setting of protection bits for transfers on each stream.
4.2.7 Bus and transfer widths
The physical width of the AHB bus is 32 bits. Source and destination transfers can be of
differing widths, and can be the same width or narrower than the physical bus width. The
GPDMA packs or unpacks data as appropriate.
4.2.8 Endian behavior
The GPDMA can cope with both little-endian and big-endian addressing. You can set the
endianness of each AHB master individually.
Internally the GPDMA treats all data as a stream of bytes instead of 16 bit or 32 bit
quantities. This means that when performing mixed-endian activity, where the endianness
of the source and destination are different, byte swapping of the data within the 32 bit data
bus is observed.
Note: If you do not require byte swapping then avoid using different endianness between
the source and destination addresses.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 651. Endian behavior
Source
Endian
Destination
Endian
Source
Width
Destination
Width
Source
Transfer no/
byte Lane
Source
Data
Destination
Transfer no/
byte Lane
Destination
Data
Little
Little
Little
Little
Little
Little
Little
Little
Little
Big
Little
Little
Little
Little
Little
Little
Little
Little
Little
Big
8
8
1/[7:0]
21
43
65
87
21
43
65
87
21
43
65
87
21
43
65
87
21
43
65
87
21
43
65
87
21
43
65
87
21
43
65
87
21
43
65
87
12
34
56
78
1/[7:0]
21212121
43434343
65656565
87878787
43214321
87658765
2/[15:8]
3/[23:16]
4/[31:24]
1/[7:0]
2/[15:8]
3/[23:16]
4/[31:24]
1/[15:0]
2/[31:16]
8
16
32
8
2/[15:8]
3/[23:16]
4/[31:24]
1/[7:0]
8
1/[31:0]
87654321
2/[15:8]
3/[23:16]
4/[31:24]
1/[7:0]
16
16
16
32
32
32
8
1/[7:0]
21212121
43434343
65656565
87878787
43214321
87658765
1/[15:8]
2/[23:16]
2/[31:24]
1/[7:0]
2/[15:8]
3/[23:16]
4/[31:24]
1/[15:0]
2/[31:16]
16
32
8
1/[15:8]
2/[23:16]
2/[31:24]
1/[7:0]
1/[31:0]
87654321
2/[15:8]
3/[23:16]
4/[31:24]
1/[7:0]
1/[7:0]
21212121
43434343
65656565
87878787
43214321
87658765
1/[15:8]
2/[23:16]
2/[31:24]
1/[7:0]
2/[15:8]
3/[23:16]
4/[31:24]
1/[15:0]
2/[31:16]
16
32
8
1/[15:8]
2/[23:16]
2/[31:24]
1/[7:0]
1/[31:0]
87654321
2/[15:8]
3/[23:16]
4/[31:24]
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
12121212
34343434
56565656
78787878
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 651. Endian behavior
Source
Endian
Destination
Endian
Source
Width
Destination
Width
Source
Transfer no/
byte Lane
Source
Data
Destination
Transfer no/
byte Lane
Destination
Data
Big
Big
Big
Big
Big
Big
Big
Big
Big
Big
Big
Big
Big
Big
Big
Big
8
16
32
8
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
12
34
56
78
12
34
56
78
12
34
56
78
12
34
56
78
12
34
56
78
12
34
56
78
12
34
56
78
12
34
56
78
1/[15:0]
12341234
56785678
2/[31:16]
8
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[31:0]
12345678
16
16
16
32
32
32
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
12121212
34343434
56565656
78787878
12341234
56785678
16
32
8
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[15:0]
2/[31:16]
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[31:0]
12345678
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
12121212
34343434
56565656
78787878
12341234
56785678
16
32
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[15:0]
2/[31:16]
1/[31:24]
2/[23:16]
3/[15:8]
4/[7:0]
1/[31:0]
12345678
4.2.9 Error conditions
An error during a DMA transfer is flagged directly by the peripheral by asserting an Error
response on the AHB bus during the transfer. The GPDMA automatically disables the
DMA stream after the current transfer has completed, and can optionally generate an
error interrupt to the CPU. This error interrupt can be masked.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
4.2.10 Channel hardware
Each stream is supported by a dedicated hardware channel, including source and
destination controllers, and a FIFO. This enables better latency than a DMA controller with
only a single hardware channel shared between several DMA streams and simplifies the
control logic.
4.2.11 DMA request priority
DMA channel priority is fixed. DMA channel 0 has the highest priority and DMA channel 1
has the lowest priority.
If the GPDMA is transferring data for the lower priority channel and then the higher priority
channel goes active, it completes the number of transfers delegated to the master
interface by the lower priority channel before switching over to transfer data for the higher
priority channel. In the worst case this is as large as a one quadword. Channel 1 in the
GPDMA is designed so that it cannot saturate the AHB bus. If it goes active, the GPDMA
relinquishes control of the bus (for a bus cycle), after four transfers of the programmed
size (irrespective of the size of transfer). This enables other AHB masters to access the
bus.
It is recommended that memory-to-memory transactions use the low priority channel.
Otherwise other (lower priority) AHB bus masters are prevented from accessing the bus
during GPDMA memory-to-memory transfer.
4.2.12 Interrupt generation
A combined interrupt output is generated as an OR function of the individual interrupt
requests of the GPDMA, and is connected to the LPC2400 interrupt controller.
4.2.13 The completion of the DMA transfer indication
The completion of the DMA transfer is indicated by:
1. The transfer count reaching 0 if the GPDMA is performing flow control, OR
2. The peripheral setting the DMA Last Word Request Input (DMACLSREQ) or the DMA
Last Burst Request Input (DMALBREQ) if the peripheral is performing flow control.
Last Word Request Input nor DMA Last Burst Request Input. Therefore there will be no
indication of completion if SSP0, SSP1 and I2S are performing the flow control.
4.3 DMA system connections
The connection of the GPDMA to the supported peripheral devices depends on the DMA
numbers used by the supported peripherals.
Table 652. DMA Connections
Peripheral Function DMA Single
Request Input
DMA Burst
Request Input
DMA Last Word DMA Last Burst
Request Input
Request Input
SSP0 Tx
SSP0 Rx
SSP1 Tx
0
1
2
0
1
2
-
-
-
-
-
-
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 652. DMA Connections
Peripheral Function DMA Single
Request Input
DMA Burst
Request Input
DMA Last Word DMA Last Burst
Request Input
Request Input
SSP1 Rx
3
4
-
3
4
5
6
-
-
SD/MMC
4
-
4
-
I2S channel 0
I2S channel 1
-
-
-
5. Programming the GPDMA
The GPDMA enables peripheral-to-memory, memory-to-peripheral,
peripheral-to-peripheral, and memory-to-memory transactions. Each DMA stream is
configured to provide unidirectional DMA transfers for a single source and destination.
The source and destination areas can each be either a memory region or a peripheral
which supports the GPDMA, and must be accessible through AHB1.
The following applies to the registers used in the GPDMA:
• Reserved or unused address locations must not be accessed because this can result
in unpredictable behavior of the device.
• Reserved or unused bits of registers must be written as zero, and ignored on read
unless otherwise stated in the relevant text.
• All register bits are reset to a logic 0 by a system or power-on reset unless otherwise
stated in the relevant text.
• Unless otherwise stated in the relevant text, all registers support read and write
accesses. A write updates the contents of a register and a read returns the contents
of the register.
• All registers defined in this document can only be accessed using word reads and
word writes (i.e. 32 bit accesses), unless otherwise stated in the relevant text.
5.1 Enabling the GPDMA
To enable the GPDMA set the DMA Enable bit in the DMACConfiguration Register
5.2 Disabling the GPDMA
To disable the GPDMA:
1. Read the DMACEnbldChns Register and ensure that all the DMA channels have
been disabled. If any channels are active, see Section 32–5.4 “Disabling a DMA
2. Disable the GPDMA by writing 0 to the DMA Enable bit in the DMACConfiguration
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
5.3 Enabling a DMA channel
To enable the DMA channel set the Channel Enable bit in the relevant DMA channel
Configuration Register ( Section 32–6.2.6 “Channel Configuration Registers
Note: The channel must be fully initialized before it is enabled. Additionally, you must set
the Enable bit of the GPDMA before any channels are enabled.
5.4 Disabling a DMA channel
You can disable a DMA channel in the following ways:
• Write directly to the Channel Enable bit. Any outstanding data in the FIFOs is lost if
this method is used.
• Use the Active and Halt bits in conjunction with the Channel Enable bit.
• Wait until the transfer completes. The channel is then automatically disabled.
5.5 Disabling a DMA channel without losing data in the FIFO
To disable a DMA channel without losing data in the FIFO:
DMACC1Configuration - 0xFFE0 4130)”). This causes any further DMA requests to
be ignored.
2. Poll the Active bit in the relevant channel Configuration Register until it reaches 0.
This bit indicates whether there is any data in the channel which has to be transferred.
3. Clear the Channel Enable bit in the relevant channel Configuration Register.
5.6 Setup a new DMA transfer
To set up a new DMA transfer:
1. If the channel is not set aside for the DMA transaction:
– Read the DMACEnbldChns Register and find out which channels are inactive (see
– Choose an inactive channel that has the required priority.
2. Program the GPDMA.
5.7 Disabling a DMA channel and losing data in the FIFO
Clear the relevant Channel Enable bit in the relevant channel Configuration Register
0xFFE0 4110 and DMACC1Configuration - 0xFFE0 4130)”). The current AHB transfer, if
one is in progress, completes and the channel is disabled. Any data in the FIFO is lost.
5.8 Halting a DMA transfer
Set the Halt bit in the relevant DMA channel Configuration Register. The current source
request is serviced. Any further source DMA requests are ignored until the Halt bit is
cleared.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
5.9 Programming a DMA channel
To program a DMA channel:
1. Choose a free DMA channel with the priority required. DMA channel 0 has the highest
priority and DMA channel 1 the lowest priority.
2. Clear any pending interrupts on the channel to be used by writing to the
channel operation might have left interrupts active.
5. Write the address of the next Linked List Item (LLI) into the DMACCxLLI Register
and DMACC1LLI - 0xFFE0 4128)”). If the transfer consists of a single packet of data
then 0 must be written into this register.
7. Write the channel configuration information into the DMACCxConfiguration Register
0xFFE0 4110 and DMACC1Configuration - 0xFFE0 4130)”). If the Enable bit is set
then the DMA channel is automatically enabled.
6. Register description
Table 653. Summary of GPDMA registers
Name
Description
Access Reset
Value[1]
Address
General Registers
DMACIntStatus
Interrupt Status Register
RO
RO
0x0
0x0
0xFFE0 4000
0xFFE0 4004
DMACIntTCStatus
Interrupt Terminal Count
Status Register
DMACIntTCClear
Interrupt Terminal Count Clear WO
Register
-
0xFFE0 4008
DMACIntErrorStatus
DMACIntErrClr
Interrupt Error Status Register RO
Interrupt Error Clear Register WO
0x0
0xFFE0 400C
0xFFE0 4010
0xFFE0 4014
-
-
DMACRawIntTCStatus
Raw Interrupt Terminal Count RO
Status Register
DMACRawIntErrorStatus Raw Error Interrupt Status
Register
RO
-
0xFFE0 4018
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 653. Summary of GPDMA registers
Name
Description
Access Reset
Value[1]
Address
DMACEnbldChns
DMACSoftBReq
Enabled Channel Register
RO
0x0
0xFFE0 401C
0xFFE0 4020
Software Burst Request
Register
R/W
0x0000
DMACSoftSReq
DMACSoftLBReq
DMACSoftLSReq
Software Single Request
Register
R/W
R/W
0x0000
0x0000
0x0000
0xFFE0 4024
0xFFE0 4028
0xFFE0 402C
Software Last Burst Request
Register
Software Last Single Request R/W
Register
DMACConfiguration
DMACSync
Configuration Register
R/W
R/W
0x0000 0000 0xFFE0 4030
0x0000 0xFFE0 4034
Synchronization Register
Channel 0 Registers
DMACC0SrcAddr
Channel 0 Source Address
Register
R/W
R/W
R/W
0x0000 0000 0xFFE0 4100
0x0000 0000 0xFFE0 4104
0x0000 0000 0xFFE0 4108
0x0000 0000 0xFFE0 410C
DMACC0DestAddr
DMACC0LLI
Channel 0 Destination
Address Register
Channel 0 Linked List Item
Register
DMACC0Control
Channel 0 Control Register
R/W
R/W
DMACC0Configuration
Channel 0 Configuration
Register
0x00000 [2]
0xFFE0 4110
Channel 1 Registers
DMACC1SrcAddr
Channel 1 Source Address
Register
R/W
R/W
R/W
0x0000 0000 0xFFE0 4120
0x0000 0000 0xFFE0 4124
0x0000 0000 0xFFE0 4128
0x0000 0000 0xFFE0 412C
DMACC1DestAddr
DMACC1LLI
Channel 1 Destination
Address Register
Channel 1 Linked List Item
Register
DMACC1Control
Channel 1 Control Register
R/W
R/W
DMACC1Configuration
Channel 1 Configuration
Register
0x00000 [2]
0xFFE0 4130
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
[2] Bit [17] is read-only.
6.1 General GPDMA registers
This section describes the registers of the GPDMA.
6.1.1 Interrupt Status Register (DMACIntStatus - 0xFFE0 4000)
The DMACIntStatus Register is read-only and shows the status of the interrupts after
masking. A HIGH bit indicates that a specific DMA channel interrupt request is active. The
request can be generated from either the error or terminal count interrupt requests.
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Table 654. Interrupt Status register (DMACIntStatus - address 0xFFE0 4000) bit description
Bit
Symbol
Description
Reset
Value
0
IntStatus0
IntStatus1
-
Status of channel 0 interrupts after masking.
Status of channel 1 interrupts after masking.
0
0
1
31:2
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.1.2 Interrupt Terminal Count Status Register (DMACIntTCStatus - 0xFFE0 4004)
The DMACIntTCStatus Register is read-only and indicates the status of the terminal count
Register.
Table 655. Interrupt Terminal Count Status register (DMACIntTCStatus - address
0xFFE0 4004) bit description
Bit
Symbol
Description
Reset
Value
0
IntTCStatus0
IntTCStatus1
-
Terminal count interrupt request status for channel 0.
Terminal count interrupt request status for channel 1.
0
0
1
31:2
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.1.3 Interrupt Terminal Count Clear Register (DMACIntClear - 0xFFE0 4008)
The DMACIntTCClear Register is write-only and clears a terminal count interrupt request.
When writing to this register, each data bit that is set HIGH causes the corresponding bit
in the status register to be cleared. Data bits that are LOW have no effect on the
DMACIntTCClear Register.
Table 656. Interrupt Terminal Count Clear register (DMACIntClear - address 0xFFE0 4008) bit
description
Bit
Symbol
IntTCClear0
IntTCClear1
-
Description
Reset
Value
0
Writing a 1 clears the terminal count interrupt request for
channel 0 (IntTCStatus0).
-
1
Writing a 1 clears the terminal count interrupt request for
channel 1 (IntTCStatus1).
-
31:2
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.1.4 Interrupt Error Status Register (DMACIntErrorStatus - 0xFFE0 400C)
The DMACIntErrorStatus Register is read-only and indicates the status of the error
DMACIntErrorStatus Register.
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Table 657. Interrupt Error Status register (DMACIntErrorStatus - address 0xFFE0 400C) bit
description
Bit
Symbol
Description
Reset
Value
0
IntErrorStatus0
Interrupt error status for channel 0.
Interrupt error status for channel 1.
0x0
0x0
1
IntErrorStatus1
-
31:2
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.1.5 Interrupt Error Clear Register (DMACIntErrClr - 0xFFE0 4010)
The DMACIntErrClr Register is write-only and clears the error interrupt requests. When
writing to this register, each data bit that is HIGH causes the corresponding bit in the
status register to be cleared. Data bits that are LOW have no effect on the corresponding
Table 658. Interrupt Error Clear register (DMACIntErrClr - address 0xFFE0 4010) bit
description
Bit
Symbol
IntErrClr0
IntErrClr1
-
Description
Reset
Value
0
Writing a 1 clears the error interrupt request for channel 0
(IntErrorStatus0).
-
1
Writing a 1 clears the error interrupt request for channel 1
(IntErrorStatus1).
-
31:2
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.1.6 Raw Interrupt Terminal Count Status Register (DMACRawIntTCStatus -
0xFFE0 4014)
The DMACRawIntTCStatus Register is read-only and indicates which DMA channel is
requesting a transfer complete (terminal count interrupt) prior to masking. A HIGH bit
shows the bit assignments of the DMACRawIntTCStatus Register.
Table 659. Raw Interrupt Terminal Count Status register (DMACRawIntTCStatus - address
0xFFE0 4014) bit description
Bit
Symbol
Description
Reset
Value
0
RawIntTCStatus0 Status of the terminal count interrupt for channel 0 prior to
masking.
-
1
RawIntTCStatus1 Status of the terminal count interrupt for channel 1 prior to
masking.
-
31:2
-
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.1.7 Raw Error Interrupt Status Register (DMACRawIntErrorStatus -
0xFFE0 4018)
The DMACRawIntErrorStatus Register is read-only and indicates which DMA channel is
requesting an error interrupt prior to masking. A HIGH bit indicates that the error interrupt
the DMACRawIntErrorStatus Register.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 660. Raw Error Interrupt Status register (DMACRawIntErrorStatus - address
0xFFE0 4018) bit description
Bit
Symbol
Description
Reset
Value
0
RawIntErrorStatus0 Status of the error interrupt for channel 0 prior to masking.
RawIntErrorStatus1 Status of the error interrupt for channel 1 prior to masking.
-
1
-
31:2
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.1.8 Enabled Channel Register (DMACEnbldChns - 0xFFE0 401C)
The DMACEnbldChns Register is read-only and indicates which DMA channels are
enabled, as indicated by the Enable bit in the DMACCxConfiguration Register. A HIGH bit
indicates that a DMA channel is enabled. A bit is cleared on completion of the DMA
Table 661. Enabled Channel register (DMACEnbldChns - address 0xFFE0 401C) bit
description
Bit
Symbol
Description
Reset
Value
0
EnabledChannels0 Enable status for Channel 0.
EnabledChannels1 Enable status for Channel 1.
0
1
0
31:2
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.1.9 Software Burst Request Register (DMACSoftBReq - 0xFFE0 4020)
The DMACSoftBReq Register is read/write and enables DMA burst requests to be
generated by software. A DMA request can be generated for each source by writing a 1 to
the corresponding register bit. A register bit is cleared when the transaction has
completed. Writing 0 to this register has no effect. Reading the register indicates which
sources are requesting DMA burst transfers. A request can be generated from either a
DMACSoftBReq Register.
Table 662. Software Burst Request register (DMACSoftBReq - address 0xFFE0 4020) bit
description
Bit
Symbol
Description
Reset
Value
0
SoftBReqSSP0Tx Software burst request flag for SSP0 Tx.
SoftBReqSSP0Rx Software burst request flag for SSP0 Rx.
SoftBReqSSP1Tx Software burst request flag for SSP1 Tx.
SoftBReqSSP1Rx Software burst request flag for SSP1 Rx.
SoftBReqSDMMC Software burst request flag for SD/MMC.
0
1
0
2
0
3
0
4
0
5
SoftBReqI2S0
Software burst request flag for I2S0.
Software burst request flag for I2S1.
0
6
SoftBReqI2S1
-
0
31:7
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
Note: It is recommended that software and hardware peripheral requests are not used at
the same time.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
6.1.10 Software Single Request Register (DMACSoftSReq - 0xFFE0 4024)
The DMACSoftSReq Register is read/write and enables DMA single requests to be
generated by software. A DMA request can be generated for each source by writing a 1 to
the corresponding register bit. A register bit is cleared when the transaction has
completed. Writing 0 to this register has no effect. Reading the register indicates which
sources are requesting single DMA transfers. A request can be generated from either a
DMACSoftSReq Register.
Table 663. Software Single Request register (DMACSoftSReq - address 0xFFE0 4024) bit
description
Bit
Symbol
Description
Reset
Value
0
SoftReqSSP0Tx
SoftReqSSP0Rx
SoftReqSSP1Tx
SoftReqSSP1Rx
SoftReqSDMMC
-
Single software request flag for SSP0 Tx.
Single software request flag for SSP0 Rx.
Single software request flag for SSP1 Tx.
Single software request flag for SSP1 Rx.
Single software request flag for SD/MMC.
0
0
0
0
0
1
2
3
4
31:5
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
6.1.11 Software Last Burst Request Register (DMACSoftLBreq - 0xFFE0 4028)
The DMACSoftLBReq Register is read/write and enables DMA last burst requests to be
generated by software. A DMA request can be generated for each source by writing a 1 to
the corresponding register bit. A register bit is cleared when the transaction has
completed. Writing 0 to this register has no effect. Reading the register indicates which
sources are requesting last burst DMA transfers. A request can be generated from either
the DMACSoftLBReq Register.
Table 664. Software Last Burst Request register (DMACSoftLBReq - address 0xFFE0 4028)
bit description
Bit
Symbol
Description
Reset
Value
3:0
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
4
SoftLBReqSDMMC Software last burst request flags for SD/MMC.
0
31:5
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
6.1.12 Software Last Single Request Register (DMACSoftLSReq - 0xFFE0 402C)
The DMACSoftLSReq Register is read/write and enables DMA last single requests to be
generated by software. A DMA request can be generated for each source by writing a 1 to
the corresponding register bit. A register bit is cleared when the transaction has
completed. Writing 0 to this register has no effect. Reading the register indicates which
sources are requesting last single DMA transfers. A request can be generated from either
the DMACSoftLSReq Register.
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Table 665. Software Last Single Request register (DMACSoftLSReq - address 0xFFE0 402C)
bit description
Bit
Symbol
Description
Reset
Value
3:0
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
4
SoftLSReqSDMMC Software last single request flags for SD/MMC.
0
31:5
-
Reserved, user software should not write ones to reserved NA
bits. The value read from a reserved bit is not defined.
6.1.13 Configuration Register (DMACConfiguration - 0xFFE0 4030)
The DMACConfiguration Register is read/write and configures the operation of the
GPDMA. The endianness of the AHB master interface can be altered by writing to the M
bit of this register. The AHB master interface is set to little-endian mode on reset.
Table 666. Configuration register (DMACConfiguration - address 0xFFE0 4030) bit
description
Bit
Symbol Value Description
Reset
Value
0
E
M
-
GPDMA enable:
0
0
1
Disabled. Disabling the GPDMA reduces power consumption.
Enabled.
1
AHB Master endianness configuration:
Little-endian mode.
0
0
1
-
Big-endian mode.
31:2
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
6.1.14 Synchronization Register (DMACSync - 0xFFE0 4034)
The DMACSync Register is read/write and enables or disables synchronization logic for
the DMA request signals. The DMA request signals consist of the DMACBREQ[15:0],
DMACSREQ[15:0], DMACLBREQ[15:0], and DMACLSREQ[15:0]. A bit set to 0 enables
the synchronization logic for a particular group of DMA requests. A bit set to 1 disables the
synchronization logic for a particular group of DMA requests. This register is reset to 0,
synchronization logic enabled.
Table 667. Synchronization register (DMACSync - address 0xFFE0 4034) bit description
Bit
Symbol
Description
Reset
Value
15:0 DMACSync
DMA synchronization logic for DMA request signals enabled or 0x0000
disabled. A LOW bit indicates that the synchronization logic for
the DMACBREQ[15:0], DMACSREQ[15:0],
DMACLBREQ[15:0], and DMACLSREQ[15:0] request signals
is enabled. A HIGH bit indicates that the synchronization logic
is disabled.
31:16 -
Reserved, user software should not write ones to reserved bits. NA
The value read from a reserved bit is not defined.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
6.2 Channel registers
The channel registers are used to program the two DMA channels. These registers
consist of:
• Two DMACCxSrcAddr Registers
• Two DMACCxDestAddr Registers
• Two DMACCxLLI Registers
• Two DMACCxControl Registers
• Two DMACCxConfiguration Registers
When performing scatter/gather DMA the first four registers are automatically updated.
6.2.1 Channel Source Address Registers (DMACC0SrcAddr - 0xFFE0 4100 and
DMACC1SrcAddr - 0xFFE0 4120)
The two read/write DMACCxSrcAddr Registers contain the current source address
(byte-aligned) of the data to be transferred. Each register is programmed directly by
software before the appropriate channel is enabled. When the DMA channel is enabled
this register is updated:
• As the source address is incremented.
• By following the linked list when a complete packet of data has been transferred.
Reading the register when the channel is active does not provide useful information. This
is because by the time software has processed the value read, the channel might have
progressed. It is intended to be read only when the channel has stopped, in which case it
shows the source address of the last item read.
Note: The source and destination addresses must be aligned to the source and
destination widths.
Table 668. Channel Source Address registers (DMACC0SrcAddr - address 0xFFE0 4100 and
DMACC1SrcAddr - address 0xFFE0 4120) bit description
Bit
Symbol
Description
Reset Value
31:0 SrcAddr
DMA source address.
0x0000 0000
6.2.2 Channel Destination Address Registers (DMACC0DestAddr - 0xFFE0 4104
and DMACC1DestAddr - 0xFFE0 4124)
The two read/write DMACCxDestAddr Registers contain the current destination address
(byte-aligned) of the data to be transferred. Each register is programmed directly by
software before the channel is enabled. When the DMA channel is enabled the register is
updated as the destination address is incremented and by following the linked list when a
complete packet of data has been transferred. Reading the register when the channel is
active does not provide useful information. This is because by the time that software has
processed the value read, the channel might have progressed. It is intended to be read
only when a channel has stopped, in which case it shows the destination address of the
Register.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 669. Channel Destination Address registers (DMACC0DestAddr - address
0xFFE0 4104 and DMACC1DestAddr - address 0xFFE0 4124) bit description
Bit
Symbol
Description
Reset Value
31:0 DestAddr DMA destination address
0x0000 0000
6.2.3 Channel Linked List Item Registers (DMACC0LLI - 0xFFE0 4108 and
DMACC1LLI - 0xFFE0 4128)
The two read/write DMACCxLLI Registers contain a word-aligned address of the next
Linked List Item (LLI). If the LLI is 0, then the current LLI is the last in the chain, and the
DMA channel is disabled when all DMA transfers associated with it are completed.
Note: Programming this register when the DMA channel is enabled has unpredictable
side effects.
Table 670. Channel Linked List Item registers (DMACC0LLI - address 0xFFE0 4108 and
DMACC1LLI - address 0xFFE0 4128) bit description
Bit
0
Symbol
Description
Reset Value
Reserved Reserved, read as zero, do not modify.
NA
0
1
R
Reserved, and must be written as 0, masked on read.
31:2 LLI
Linked list item. Bits [31:2] of the address for the next LLI.
Address bits [1:0] are 0.
0
Note: To make loading the LLIs more efficient for some systems, the LLI data structures
can be made four-word aligned.
6.2.4 Channel Control Registers (DMACC0Control - 0xFFE0 410C and
DMACC0Control - 0xFFE0 412C)
The two read/write DMACCxControl Registers contain DMA channel control information
such as the transfer size, burst size, and transfer width. Each register is programmed
directly by software before the DMA channel is enabled. When the channel is enabled the
register is updated by following the linked list when a complete packet of data has been
transferred. Reading the register while the channel is active does not give useful
information. This is because by the time software has processed the value read, the
channel might have progressed. It is intended to be read only when a channel has
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 671. Channel Control registers (DMACC0Control - address 0xFFE0 410C and
DMACC1Control - address 0xFFE0 412C) bit description
Bit
Symbol
Description
Reset Value
11:0 TransferSize Transfer size. A write to this field sets the size of the transfer
when the GPDMA is the flow controller.A read from this field
indicates the number of transfers completed on the
0
destination bus. Reading the register when the channel is
active does not give useful information because by the time
that the software has processed the value read, the channel
might have progressed. It is intended to be used only when a
channel is enabled and then disabled.The transfer size value
is not used if the GPDMA is not the flow controller.
14:12 SBSize
17:15 DBsize
Source burst size. Indicates the number of transfers that
make up a source burst. This value must be set to the burst
size of the source peripheral, or if the source is memory, to
the memory boundary size. The burst size is the amount of
data that is transferred when the DMACBREQ signal goes
active in the source peripheral.
0
0
Destination burst size. Indicates the number of transfers that
make up a destination burst transfer request. This value must
be set to the burst size of the destination peripheral, or if the
destination is memory, to the memory boundary size. The
burst size is the amount of data that is transferred when the
DMACBREQ signal goes active in the destination peripheral.
20:18 SWidth
23:21 DWidth
Source transfer width. Transfers wider than the AHB master
bus width are illegal.The source and destination widths can
be different from each other. The hardware automatically
packs and unpacks the data as required.
0
0
Destination transfer width. Transfers wider than the AHB
master bus width are not supported.The source and
destination widths can be different from each other. The
hardware automatically packs and unpacks the data as
required.
25:24 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
0
26
27
SI
DI
Source increment. When set the source address is
incremented after each transfer.
Destination increment. When set the destination address is
incremented after each transfer.
0
30:28 Prot
31
Protection.
0
0
I
Terminal count interrupt enable bit. It controls whether the
current LLI is expected to trigger the terminal count interrupt.
burst sizes.
Table 672. Source or destination burst size
Bit value of DBSize or SBSize
Source or distention burst transfer request size
000
001
010
011
1
4
8
16
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 672. Source or destination burst size
Bit value of DBSize or SBSize
Source or distention burst transfer request size
100
101
110
111
32
64
128
256
transfer width.
Table 673. Source or destination transfer width
Bit value of DBWidth or SBWidth
Source or distention burst transfer request size
000
Byte (8 bit)
001
Halfword (16 bit)
Word (32 bit)
Reserved
010
011 and 1xxx
6.2.5 Protection and Access Information
AHB access information is provided to the source and destination peripherals when a
transfer occurs. The transfer information is provided by programming the DMA channel
(the Prot bit of the DMACCxControl Register, and the Lock bit of the
DMACCxConfiguration Register). These bits are programmed by software and
peripherals can use this information if necessary. Three bits of information are provided,
Table 674. Protection bits
DMACC1Control Value Description
Bit
Reset
Value
28
29
Privileged or User. This bit controls the AHB HPROT[1] signal. 0
Indicates that the access is in User, or privileged mode:
0
1
User mode.
Privileged mode.
Bufferable or not bufferable. This bit indicates that the access
is bufferable. This bit can, for example, be used to indicate to
an AMBA bridge that the read can complete in zero wait states
on the source bus without waiting for it to arbitrate for the
destination bus and for the slave to accept the data. This bit
controls the AHB HPROT[2] signal.
0
Indicates that the access is bufferable, or not bufferable:
0
1
Not bufferable.
Bufferable.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 674. Protection bits
DMACC1Control Value Description
Bit
Reset
Value
30
Cacheable or not cacheable. This indicates that the access is
cacheable. This bit can, for example, be used to indicate to an
AMBA bridge that when it saw the first read of a burst of eight it
can transfer the whole burst of eight reads on the destination
bus, rather than pass the transactions through one at a time.
This bit controls the AHB HPROT[3] signal.
0
Indicates that the access is cacheable or not cacheable:
0
1
Not cacheable.
Cacheable.
6.2.6 Channel Configuration Registers (DMACC0Configuration - 0xFFE0 4110 and
DMACC1Configuration - 0xFFE0 4130)
The two DMACCxConfiguration Registers are read/write with the exception of bit[17]
which is read-only. Used these to configure the DMA channel. The registers are not
DMACCxConfiguration Register.
Table 675. Channel Configuration registers (DMACC0Configuration - address 0xFFE0 4110 and
DMACC1Configuration - address 0xFFE0 4130) bit description
Bit
Symbol
Value Description
Reset
Value
0
E
The Channel Enable bit status can also be found by reading the DMACEnbldChns
0
Register.
A channel is enabled by setting this bit.
A channel can be disabled by clearing the Enable bit. This causes the current AHB
transfer (if one is in progress) to complete and the channel is then disabled. Any
data in the FIFO of the relevant channel is lost. Restarting the channel by setting the
Channel Enable bit has unpredictable effects and the channel must be fully
re-initialized.
The channel is also disabled, and Channel Enable bit cleared, when the last LLI is
reached or if a channel error is encountered.
If a channel has to be disabled without losing data in the FIFO the Halt bit must be
set so that further DMA requests are ignored. The Active bit must then be polled
until it reaches 0, indicating that there is no data left in the FIFO. Finally the Channel
Enable bit can be cleared.
Channel enable -- reading this bit indicates whether a channel is currently enabled
or disabled:
0
1
Channel disabled.
Channel enabled.
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Table 675. Channel Configuration registers (DMACC0Configuration - address 0xFFE0 4110 and
DMACC1Configuration - address 0xFFE0 4130) bit description
Bit
Symbol
Value Description
Reset
Value
4:1
SrcPeripheral
Source peripheral. This value selects the DMA source request peripheral.This field
is ignored if the source of the transfer is from memory.
0
0000 SSP0 Tx
0001 SSP0 Rx
0010 SSP1 Tx
0011 SSP1 Rx
0100 SD/MMC
0101 I2S channel 0
0110 I2S channel 1
0111 These values are reserved and should not be used.
or
1xxx
5
-
-
Reserved, do not modify, masked on read.
NA
0
9:6
DestPeriphera
l
Destination peripheral. This value selects the DMA destination request peripheral.
This field is ignored if the destination of the transfer is to memory. See the
SrcPeripheral symbol description for values.
10
-
-
Reserved, do not modify, masked on read.
NA
0
13:11 FlowCntrl
Flow control and transfer type. This value indicates the flow controller and transfer
type. The flow controller can be the GPDMA, the source peripheral, or the
destination peripheral.The transfer type can be memory-to-memory,
memory-to-peripheral, peripheral-to-memory, or peripheral-to-peripheral.
14
15
IE
Interrupt error mask. When cleared this bit masks out the error interrupt of the
relevant channel.
0
0
0
ITC
Terminal count interrupt mask. When cleared this bit masks out the terminal count
interrupt of the relevant channel.
16
17
L
Lock. When set, this bit enables locked transfers.
A
Active. This value can be used with the Halt and Channel Enable bits to cleanly
disable a DMA channel. Writing to this bit has no effect.
0
1
There is no data in the FIFO of the channel.
The channel FIFO has data.
18
H
Halt. The contents of the channel FIFO are drained. This value can be used with the
Active and Channel Enable bits to cleanly disable a DMA channel.
0
0
1
Enable DMA requests.
Ignore further source DMA requests.
Reserved, do not modify, masked on read.
31:19 -
NA
6.2.7 Lock control
Set the lock bit by programming bit 16 in the DMACCxConfiguration Register.
When a burst occurs, the AHB arbiter must not de-grant the master during the burst until
the lock is deasserted. The GPDMA can be locked for a a single burst such as a long
source fetch burst or a long destination drain burst. The GPDMA does not usually assert
the lock continuously for a source fetch burst followed by a destination drain burst.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
There are situations when the GPDMA asserts the lock for source transfers followed by
destination transfers. This is possible when internal conditions in the GPDMA permit it to
perform a source fetch followed by a destination drain back-to-back.
6.2.8 Flow control and transfer type
Table 676. Flow control and transfer type bits
Bit Value Transfer Type
Controller
DMA
000
001
010
011
100
101
110
111
Memory to memory.
Memory to peripheral.
DMA
Peripheral to memory.
DMA
Source peripheral to destination peripheral.
Source peripheral to destination peripheral.
Memory to peripheral.
DMA
Destination peripheral.
Peripheral.
Peripheral.
Source peripheral.
Peripheral to memory.
Source peripheral to destination peripheral.
7. Address generation
Address generation can be either incrementing or non-incrementing (address wrapping is
not supported). Bursts do not cross the 1 kB address boundary.
8. Scatter/Gather
Scatter/gather is supported through the use of linked lists. This means that the source and
destination areas do not have to occupy contiguous areas in memory. Where
scatter/gather is not required the DMACCxLLI Register must be set to 0.
The source and destination data areas are defined by a series of linked lists. Each Linked
List Item (LLI) controls the transfer of one block of data, and then optionally loads another
LLI to continue the DMA operation, or stops the DMA stream. The first LLI is programmed
into the GPDMA.
The data to be transferred described by a LLI (referred to as the packet of data) usually
requires one or more DMA bursts (to each of the source and destination).
8.1 Linked List Items
A Linked List Item (LLI) consists of four words. These words are organized in the following
order:
1. DMACCxSrcAddr.
2. DMACCxDestAddr.
3. DMACCxLLI.
4. DMACCxControl.
Note: The DMACCxConfiguration DMA channel Configuration Register is not part of the
linked list item.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
8.2 Programming the GPDMA for scatter/gather DMA
To program the GPDMA for scatter/gather DMA:
1. Write the LLIs for the complete DMA transfer to memory. Each linked list item contains
four words:
– Source address.
– Destination address.
– Pointer to next LLI.
– Control word.
The last LLI has its linked list word pointer set to 0. The LLIs must be stored in the
memory where the GPDMA has access to (i.e. AHB1 SRAM and external memory).
2. Choose a free DMA channel with the priority required. DMA channel 0 has the highest
priority and DMA channel 1 the lowest priority.
3. Write the first linked list item, previously written to memory, to the relevant channel in
the GPDMA.
4. Write the channel configuration information to the channel Configuration Register and
set the Channel Enable bit. The GPDMA then transfers the first and then subsequent
packets of data as each linked list item is loaded.
5. An interrupt can be generated at the end of each LLI depending on the Terminal
Count bit in the DMACCxControl Register. If this bit is set an interrupt is generated at
the end of the relevant LLI. The interrupt request must then be serviced and the
relevant bit in the DMACIntTCClear Register must be set to clear the interrupt.
8.3 Example of scatter/gather DMA
to a peripheral. The addresses of each line of data are given, in hexadecimal, at the
left-hand side of the figure. The LLIs describing the transfer are to be stored contiguously
from address 0x20000.
0x--200
0x–E00
0x0A---
0x0B---
0x0C---
0x0D---
0x0E---
0x0F---
0x10---
0x11---
Fig 146. LLI example
The first LLI, stored at 0x20000, defines the first block of data to be transferred, which is
the data stored between addresses 0x0A200 and 0x0AE00:
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
• Source start address 0x0A200.
• Destination address set to the destination peripheral address.
• Transfer width, word (32 bit).
• Transfer size, 3 072 bytes (0XC00).
• Source and destination burst sizes, 16 transfers.
• Next LLI address, 0x20010.
The second LLI, stored at 0x20010 , describes the next block of data to be transferred:
• Source start address 0x0B200.
• Destination address set to the destination peripheral address.
• Transfer width, word (32 bit).
• Transfer size, 3 072 bytes (0xC00).
• Source and destination burst sizes, 16 transfers.
• Next LLI address, 0x20020.
A chain of descriptors is built up, each one pointing to the next in the series. To initialize
the DMA stream, the first LLI, 0x20000, is programmed into the GPDMA. When the first
packet of data has been transferred the next LLI is automatically loaded.
The final LLI is stored at 0x20070 and contains:
• Source start address 0x11200.
• Destination address set to the destination peripheral address.
• Transfer width, word (32 bit).
• Transfer size, 3 072 bytes (0xC00).
• Source and destination burst sizes, 16 transfers.
• Next LLI address, 0x0.
Because the next LLI address is set to zero, this is the last descriptor, and the DMA
channel is disabled after transferring the last item of data. The channel is probably set to
generate an interrupt at this point to indicate to the ARM processor that the channel can
be reprogrammed.
9. Interrupt requests
Interrupt requests can be generated when an AHB error is encountered, or at the end of a
transfer (terminal count) after all the data corresponding to the current LLI has been
transferred to the destination. The interrupts can be masked by programming bits in the
relevant DMACCxControl and DMACCxConfiguration Channel Registers. Interrupt status
registers are provided which group the interrupt requests from all the DMA channels prior
to interrupt masking (DMACRawIntTCStatus and DMACRawIntErrorStatus), and after
interrupt masking (DMACIntTCStatus and DMACIntErrorStatus). The DMACIntStatus
Register combines both the DMACIntTCStatus and DMACIntErrorStatus requests into a
single register to enable the source of an interrupt to be quickly found. Writing to the
DMACIntTCClear or the DMACIntErrClr Registers with a bit set HIGH enables selective
clearing of interrupts.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
9.1 Hardware interrupt sequence flow
When a DMA interrupt request occurs, the Interrupt Service Routine needs to:
1. Read the DMACIntStatus Register to determine which channel generated the
interrupt. If more than one request is active it is recommended that the highest priority
channels be checked first.
2. Read the DMACIntTCStatus Register to determine whether the interrupt was
generated due to the end of the transfer (terminal count). A HIGH bit indicates that the
transfer completed.
3. Read the DMACIntErrorStatus Register to determine whether the interrupt was
generated due to an error occurring. A HIGH bit indicates that an error occurred.
4. Service the interrupt request.
5. For a terminal count interrupt write a 1 to the relevant bit of the DMACIntTCClr
Register. For an error interrupt write a 1 to the relevant bit of the DMACIntErrClr
Register to clear the interrupt request.
9.2 Interrupt polling sequence flow
Used when the GPDMA interrupt request signal is either masked out, disabled in the
interrupt controller or disabled in the processor. When polling the GPDMA, you must:
1. Read the DMACIntStatus Register. If none of the bits are HIGH repeat this step,
otherwise go to step 2. If more than one request is active it is recommended that the
highest priority channels be checked first.
2. Read the DMACIntTCStatus Register to determine whether the interrupt was
generated due to the end of the transfer (terminal count). A HIGH bit indicates that the
transfer completed.
3. Service the interrupt request.
4. For a terminal count interrupt write a 1 to the relevant bit of the DMACIntTCClr
Register. For an error interrupt write a 1 to the relevant bit of the DMACIntErrClr
Register to clear the interrupt request.
10. GPDMA data flow
This section describes the GPDMA data flow sequences for the four allowed transfer
types:
• Memory-to-peripheral.
• Peripheral-to-memory.
• Memory-to-memory.
• Peripheral-to-peripheral.
Each transfer type can have either the peripheral or the GPDMA as the flow controller so
there are eight possible control scenarios.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
Table 677. DMA request signal usage
Transfer Direction
Memory-to-peripheral
Memory-to-peripheral
Peripheral-to-memory
Peripheral-to-memory
Memory-to-memory
Request Generator
Peripheral
Flow Controller
GPDMA
Peripheral
Peripheral
Peripheral
GPDMA
Peripheral
Peripheral
GPDMA
GPDMA
Source peripheral to destination
peripheral
Source peripheral and
destination peripheral
Source peripheral
Source peripheral to destination
peripheral
Source peripheral and
destination peripheral
Destination peripheral
GPDMA
Source peripheral to destination
peripheral
Source peripheral and
destination peripheral
10.1 Peripheral-to-memory, or Memory-to-peripheral DMA flow
For a peripheral-to-memory or memory-to-peripheral DMA flow the following sequence
occurs:
1. Program and enable the DMA channel.
2. Wait for a DMA request.
3. The GPDMA starts transferring data when:
– The DMA request goes active.
– The DMA stream has the highest pending priority.
– The GPDMA is the bus master of the AHB bus.
4. If an error occurs while transferring the data, an error interrupt is generated and
disables the DMA stream, and the flow sequence ends.
5. Decrement the transfer count if the GPDMA is performing the flow control.
6. If the transfer has completed (indicated by the transfer count reaching 0 if the GPDMA
is performing flow control, or by the peripheral sending a DMA request if the
peripheral is performing flow control):
– The GPDMA responds with a DMA acknowledge.
– The terminal count interrupt is generated (this interrupt can be masked).
– If the DMACCxLLI Register is not 0, then reload the DMACCxSrcAddr,
DMACCxDestAddr, DMACCxLLI, and DMACCxControl Registers and go back to
step 2. However, if DMACCxLLI is 0, the DMA stream is disabled and the flow
sequence ends.
10.2 Peripheral-to-peripheral DMA flow
For a peripheral-to-peripheral DMA flow the following sequence occurs:
1. Program and enable the DMA channel.
2. Wait for a source DMA request.
3. The GPDMA starts transferring data when:
– The DMA request goes active.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
– The DMA stream has the highest pending priority.
– The GPDMA is the bus master of the AHB bus.
4. If an error occurs while transferring the data an error interrupt is generated, then
finishes.
5. Decrement the transfer count if the GPDMA is performing the flow control.
6. If the transfer has completed (indicated by the transfer count reaching 0 if the GPDMA
is performing flow control, or by the peripheral sending a DMA request if the
peripheral is performing flow control):
– The GPDMA responds with a DMA acknowledge to the source peripheral.
– Further source DMA requests are ignored.
7. When the destination DMA request goes active and there is data in the GPDMA FIFO,
transfer data into the destination peripheral.
8. If an error occurs while transferring the data, an error interrupt is generated and
disables the DMA stream, and the flow sequence ends.
9. If the transfer has completed it is indicated by the transfer count reaching 0 if the
GPDMA is performing flow control, or by sending a DMA request if the peripheral is
performing flow control. The following happens:
– The GPDMA responds with a DMA acknowledge to the destination peripheral.
– The terminal count interrupt is generated (this interrupt can be masked).
– If the DMACCxLLI Register is not 0, then reload the DMACCxSrcAddr,
DMACCxDestAddr, DMACCxLLI, and DMACCxControl Registers and go to back
to step 2. However, if DMACCxLLI is 0, the DMA stream is disabled and the flow
sequence ends.
10.3 Memory-to-memory DMA flow
For a memory-to-memory DMA flow the following sequence occurs:
1. Program and enable the DMA channel.
2. Transfer data whenever the DMA channel has the highest pending priority and the
GPDMA gains mastership of the AHB bus.
3. If an error occurs while transferring the data generate an error interrupt and disable
the DMA stream.
4. Decrement the transfer count.
5. If the count has reached zero:
– Generate a terminal count interrupt (the interrupt can be masked).
– If the DMACCxLLI Register is not 0, then reload the DMACCxSrcAddr,
DMACCxDestAddr, DMACCxLLI, and DMACCxControl Registers and go to back
to step 2. However, if DMACCxLLI is 0, the DMA stream is disabled and the flow
sequence ends.
Note: Memory-to-memory transfers should be programmed with a low channel priority,
otherwise other DMA channels cannot access the bus until the memory-to-memory
transfer has finished, or other AHB masters cannot perform any transaction.
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Chapter 32: LPC24XX General Purpose DMA (GPDMA) controller
11. Flow control
The peripheral that controls the length of the packet is known as the flow controller. The
flow controller is usually the GPDMA where the packet length is programmed by software
before the DMA channel is enabled. If the packet length is unknown when the DMA
channel is enabled, either the source or destination peripherals can be used as the flow
controller.
For simple or low-performance peripherals that know the packet length (that is, when the
peripheral is the flow controller), a simple way to indicate that a transaction has completed
is for the peripheral to generate an interrupt and enable the processor to reprogram the
DMA channel.
The transfer size value (in the DMACCxControl register) is ignored if a peripheral is
configured as the flow controller.
When the DMA is transferred:
1. The GPDMA issues an acknowledge to the peripheral in order to indicate that the
transfer has finished.
2. A TC interrupt is generated, if enabled.
3. The GPDMA moves on to the next LLI.
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Chapter 33: LPC24XX EmbeddedICE
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1. Features
• No target resources are required by the software debugger in order to start the
debugging session.
• Allows the software debugger to talk via a JTAG (Joint Test Action Group) port directly
to the core.
• Inserts instructions directly in to the ARM7TDMI-S core.
• The ARM7TDMI-S core or the System state can be examined, saved or changed
depending on the type of instruction inserted.
• Allows instructions to execute at a slow debug speed or at a fast system speed.
2. Applications
The EmbeddedICE logic provides on-chip debug support. The debugging of the target
system requires a host computer running the debugger software and an EmbeddedICE
protocol convertor. EmbeddedICE protocol convertor converts the Remote Debug
Protocol commands to the JTAG data needed to access the ARM7TDMI-S core present
on the target system.
3. Description
The ARM7TDMI-S Debug Architecture uses the existing JTAG3 port as a method of
accessing the core. The scan chains that are around the core for production test are
reused in the debug state to capture information from the databus and to insert new
information into the core or the memory. There are two JTAG-style scan chains within the
ARM7TDMI-S. A JTAG-style Test Access Port Controller controls the scan chains. In
addition to the scan chains, the debug architecture uses EmbeddedICE logic which
resides on chip with the ARM7TDMI-S core. The EmbeddedICE has its own scan chain
that is used to insert watchpoints and breakpoints for the ARM7TDMI-S core. The
EmbeddedICE logic consists of two real time watchpoint registers, together with a control
and status register. One or both of the watchpoint registers can be programmed to halt the
ARM7TDMI-S core. Execution is halted when a match occurs between the values
programmed into the EmbeddedICE logic and the values currently appearing on the
address bus, databus and some control signals. Any bit can be masked so that its value
does not affect the comparison. Either watchpoint register can be configured as a
watchpoint (i.e. on a data access) or a break point (i.e. on an instruction fetch). The
watchpoints and breakpoints can be combined such that:
• The conditions on both watchpoints must be satisfied before the ARM7TDMI core is
stopped. The CHAIN functionality requires two consecutive conditions to be satisfied
before the core is halted. An example of this would be to set the first breakpoint to
3. For more details refer to IEEE Standard 1149.1 - 1990 Standard Test Access Port and Boundary Scan Architecture.
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Chapter 33: LPC24XX EmbeddedICE
trigger on an access to a peripheral and the second to trigger on the code segment
that performs the task switching. Therefore when the breakpoints trigger the
information regarding which task has switched out will be ready for examination.
• The watchpoints can be configured such that a range of addresses are enabled for
the watchpoints to be active. The RANGE function allows the breakpoints to be
combined such that a breakpoint is to occur if an access occurs in the bottom
256 bytes of memory but not in the bottom 32 bytes.
The ARM7TDMI-S core has a Debug Communication Channel function in-built. The
debug communication channel allows a program running on the target to communicate
with the host debugger or another separate host without stopping the program flow or
even entering the debug state. The debug communication channel is accessed as a
co-processor 14 by the program running on the ARM7TDMI-S core. The debug
communication channel allows the JTAG port to be used for sending and receiving data
without affecting the normal program flow. The debug communication channel data and
control registers are mapped in to addresses in the EmbeddedICE logic.
• For more details refer to IEEE Standard 1149.1 - 1990 Standard Test Access Port and
Boundary Scan Architecture.
4. Pin description
Table 678. EmbeddedICE pin description
Pin Name Type
Description
TMS[1]
Input
Test Mode Select. The TMS pin selects the next state in the TAP state
machine.
TCK[2]
Input
Test Clock. This allows shifting of the data in, on the TMS and TDI pins. It
is a positive edgetriggered clock with the TMS and TCK signals that
define the internal state of the device.
Remark: This clock must be slower than 1⁄6 of the CPU clock (CCLK) for
the JTAG interface to operate.
TDI[1]
Input
Test Data In. This is the serial data input for the shift register.
TDO[2]
Output
Test Data Output. This is the serial data output from the shift register.
Data is shifted out of the device on the negative edge of the TCK signal.
nTRST[1]
RTCK[1]
Input
Test Reset. The nTRST pin can be used to reset the test logic within the
EmbeddedICE logic.
Output
Returned Test Clock. Extra signal added to the JTAG port. Required for
designs based on ARM7TDMI-S processor core. Multi-ICE (Development
system from ARM) uses this signal to maintain synchronization with
targets having slow or widely varying clock frequency. For details refer to
"Multi-ICE System Design considerations Application Note 72 (ARM DAI
0072A)".
Board designers may need to connect a weak bias resistor to this pin as
described below.
[1] This pin has a built-in pull-up resistor.
[2] This pin has no built-in pull-up and no built-in pull-down resistor.
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Chapter 33: LPC24XX EmbeddedICE
5. JTAG function select
Remark: JTAG access to the LPC2400 is only possible if no code read protection is
The JTAG port may be used either for debug or for boundary scan. The state of the
DBGEN pin determines which function is available. When DBGEN = 0, the JTAG port may
be used for boundary scan. When DBGEN = 1, the JTAG port may be used for debug.
6. Register description
ARM7TDMI-S debug architecture is described in detail in "ARM7TDMI-S (rev 4) Technical
Reference Manual" (ARM DDI 0234A) published by ARM Limited.
Table 679. EmbeddedICE logic registers
Name
Width Description
Address
00000
00001
00100
00101
01000
01001
01010
01011
01100
01101
10000
10001
10010
10011
10100
10101
Debug Control
6
Force debug state, disable interrupts
Debug Status
5
Status of debug
Debug Comms Control Register
Debug Comms Data Register
Watchpoint 0 Address Value
Watchpoint 0 Address Mask
Watchpoint 0 Data Value
Watchpoint 0 Data Mask
Watchpoint 0 Control Value
Watchpoint 0 Control Mask
Watchpoint 1 Address Value
Watchpoint 1 Address Mask
Watchpoint 1 Data Value
Watchpoint 1 Data Mask
Watchpoint 1 Control Value
Watchpoint 1 Control Mask
32
32
32
32
32
32
9
Debug communication control register
Debug communication data register
Holds watchpoint 0 address value
Holds watchpoint 0 address mask
Holds watchpoint 0 data value
Holds watchpoint 0 data mask
Holds watchpoint 0 control value
Holds watchpoint 0 control mask
Holds watchpoint 1 address value
Holds watchpoint 1 address mask
Holds watchpoint 1 data value
Holds watchpoint 1 data mask
Holds watchpoint 1 control value
Holds watchpoint 1 control mask
8
32
32
32
32
9
8
7. Block diagram
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Chapter 33: LPC24XX EmbeddedICE
JTAG PORT
serial
parallel
interface
EMBEDDED ICE
INTERFACE
5
EMBEDDED ICE
PROTOCOL
CONVERTER
host running debugger
ARM7TDMI-S
TARGET BOARD
Fig 147. EmbeddedICE debug environment block diagram
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Chapter 34: LPC24XX Embedded Trace Module (ETM)
Rev. 02 — 19 December 2008
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1. Features
• Closely track the instructions that the ARM core is executing.
• One external trigger input.
• 10 pin interface.
• All registers are programmed through JTAG interface.
• Does not consume power when trace is not being used.
• THUMB instruction set support.
2. Applications
As the microcontroller has significant amounts of on-chip memories, it is not possible to
determine how the processor core is operating simply by observing the external pins. The
ETM provides real-time trace capability for deeply embedded processor cores. It outputs
information about processor execution to a trace port. A software debugger allows
configuration of the ETM using a JTAG interface and displays the trace information that
has been captured, in a format that a user can easily understand.
3. Description
The ETM is connected directly to the ARM core and not to the main AMBA system bus. It
compresses the trace information and exports it through a narrow trace port. An external
Trace Port Analyzer captures the trace information under software debugger control.
Trace port can broadcast the Instruction trace information. Instruction trace (or PC trace)
shows the flow of execution of the processor and provides a list of all the instructions that
were executed. Instruction trace is significantly compressed by only broadcasting branch
addresses as well as a set of status signals that indicate the pipeline status on a cycle by
cycle basis. Trace information generation can be controlled by selecting the trigger
resource. Trigger resources include address comparators, counters and sequencers.
Since trace information is compressed the software debugger requires a static image of
the code being executed. Self-modifying code can not be traced because of this
restriction.
3.1 ETM configuration
The following standard configuration is selected for the ETM macrocell.
Table 680. ETM configuration
Resource number/type
Pairs of address comparators
Data Comparators
Small[1]
1
0 (Data tracing is not supported)
Memory Map Decoders
Counters
4
1
Sequencer Present
No
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Chapter 34: LPC24XX Embedded Trace Module (ETM)
Table 680. ETM configuration
Resource number/type
External Inputs
Small[1]
2
External Outputs
FIFOFULL Present
FIFO depth
0
Yes (Not wired)
10 bytes
4/8
Trace Packet Width
[1] For details refer to ARM documentation "Embedded Trace Macrocell Specification (ARM IHI 0014E)".
4. Pin description
Table 681. ETM pin description
Pin Name
Type
Description
TRACECLK
Output Trace Clock. The trace clock signal provides the clock for the trace
port. PIPESTAT[2:0], TRACESYNC, and TRACEPKT[3:0] signals are
referenced to the rising edge of the trace clock. This clock is not
generated by the ETM block. It is to be derived from the system clock.
The clock should be balanced to provide sufficient hold time for the
trace data signals. Half rate clocking mode is supported. Trace data
signals should be shifted by a clock phase from TRACECLK. Refer to
Figure 3.14 page 3.26 and figure 3.15 page 3.27 in "ETM7 Technical
Reference Manual" (ARM DDI 0158B), for example circuits that
implements both half-rateclocking and shifting of the trace data with
respect to the clock. For TRACECLK timings refer to section 5.2 on
page 5-13 in "Embedded Trace Macrocell Specification" (ARM IHI
0014E).
PIPESTAT[2:0] Output Pipe Line status. The pipeline status signals provide a cycle-by-cycle
indication of what is happening in the execution stage of the processor
pipeline.
TRACESYNC
Output Trace synchronization. The trace sync signal is used to indicate the
first packet of a group of trace packets and is asserted HIGH only for
the first packet of any branch address.
TRACEPKT[3:0] Output Trace Packet. The trace packet signals are used to output packaged
address and data information related to the pipeline status. All packets
are eight bits in length. A packet is output over two cycles. In the first
cycle, Packet[3:0] is output and in the second cycle, Packet[7:4] is
output.
EXTIN[0]
Input
External Trigger Input
5. Register description
detail in the ARM IHI 0014E document published by ARM Limited.
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Chapter 34: LPC24XX Embedded Trace Module (ETM)
Table 682. ETM Registers
Name
Description
Access Register
Encoding
ETM Control
Controls the general operation of the ETM.
R/W
RO
000 0000
000 0001
ETM Configuration Code
Allows a debugger to read the number of
each type of resource.
Trigger Event
Holds the controlling event.
WO
000 0010
000 0011
Memory Map Decode Control Eight bit register, used to statically configure WO
the memory map decoder.
ETM Status
Holds the pending overflow status bit.
RO
000 0100
000 0101
System Configuration
Holds the configuration information using the RO
SYSOPT bus.
Trace Enable Control 3
Trace Enable Control 2
Trace Enable Event
Trace Enable Control 1
FIFOFULL Region
Holds the trace on/off addresses.
Holds the address of the comparison.
Holds the enabling event.
WO
WO
WO
WO
WO
WO
000 0110
000 0111
000 1000
000 1001
000 1010
000 1011
Holds the include and exclude regions.
Holds the include and exclude regions.
FIFOFULL Level
Holds the level below which the FIFO is
considered full.
ViewData event
Holds the enabling event.
WO
WO
WO
WO
WO
WO
-
000 1100
000 1101
000 1110
000 1111
001 xxxx
010 xxxx
000 xxxx
100 xxxx
101 00xx
101 01xx
ViewData Control 1
ViewData Control 2
ViewData Control 3
Holds the include/exclude regions.
Holds the include/exclude regions.
Holds the include/exclude regions.
Address Comparator 1 to 16 Holds the address of the comparison.
Address Access Type 1 to 16 Holds the type of access and the size.
Reserved
-
Reserved
-
-
Initial Counter Value 1 to 4
Counter Enable 1 to 4
Holds the initial value of the counter.
WO
WO
Holds the counter clock enable control and
event.
Counter reload 1 to 4
Counter Value 1 to 4
Holds the counter reload event.
Holds the current counter value.
WO
RO
-
101 10xx
101 11xx
110 00xx
110 10xx
110 11xx
111 0xxx
111 1xxx
Sequencer State and Control Holds the next state triggering events.
External Output 1 to 4
Reserved
Holds the controlling events for each output. WO
-
-
-
-
-
-
Reserved
Reserved
6. Reset state of multiplexed pins
On the LPC2400, the ETM pin functions are multiplexed with GPIO, PWM, UART, and
CAN functions. In order to use the trace feature, the pins must be configured to select the
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Chapter 34: LPC24XX Embedded Trace Module (ETM)
7. Block diagram
APPLICATION PCB
CONNECTOR
TRACE
PORT
TRACE
10
ANALYZER
ETM
TRIGGER
PERIPHERAL
PERIPHERAL
CONNECTOR
Host
running
debugger
RAM
ROM
ARM
JTAG
INTERFACE
UNIT
5
EMBEDDED ICE
LAN
Fig 148. ETM debug environment block diagram
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Chapter 35: LPC24XX RealMonitor
Rev. 02 — 19 December 2008
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1. Features
Remark: RealMonitor is a configurable software module which enables real time debug.
RealMonitor is developed by ARM Inc. Information presented in this chapter is taken from
the ARM document RealMonitor Target Integration Guide (ARM DUI 0142A). It applies to
a specific configuration of RealMonitor software programmed in the on-chip ROM boot
memory of this device.
• Allows user to establish a debug session to a currently running system without halting
or resetting the system.
• Allows user time-critical interrupt code to continue executing while other user
application code is being debugged.
2. Applications
Real time debugging.
3. Description
RealMonitor is a lightweight debug monitor that allows interrupts to be serviced while user
debug their foreground application. It communicates with the host using the DCC (Debug
Communications Channel), which is present in the EmbeddedICE logic. RealMonitor
provides advantages over the traditional methods for debugging applications in ARM
systems. The traditional methods include:
• Angel (a target-based debug monitor).
• Multi-ICE or other JTAG unit and EmbeddedICE logic (a hardware-based debug
solution).
Although both of these methods provide robust debugging environments, neither is
suitable as a lightweight real-time monitor.
Angel is designed to load and debug independent applications that can run in a variety of
modes, and communicate with the debug host using a variety of connections (such as a
serial port or ethernet). Angel is required to save and restore full processor context, and
the occurrence of interrupts can be delayed as a result. Angel, as a fully functional
target-based debugger, is therefore too heavyweight to perform as a real-time monitor.
Multi-ICE is a hardware debug solution that operates using the EmbeddedICE unit that is
built into most ARM processors. To perform debug tasks such as accessing memory or
the processor registers, Multi-ICE must place the core into a debug state. While the
processor is in this state, which can be millions of cycles, normal program execution is
suspended, and interrupts cannot be serviced.
RealMonitor combines features and mechanisms from both Angel and Multi-ICE to
provide the services and functions that are required. In particular, it contains both the
Multi-ICE communication mechanisms (the DCC using JTAG), and Angel-like support for
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processor context saving and restoring. RealMonitor is pre-programmed in the on-chip
ROM memory (boot sector). When enabled It allows user to observe and debug while
parts of application continue to run. Refer to Section 35–4 “How to enable RealMonitor” on
page 751 for details.
3.1 RealMonitor components
DEBUGGER
RDI 1.5.1
RMHOST
host
REALMONITOR.DLL
RDI 1.5.1 RT
RealMonitor
protocol
JTAG UNIT
DCC transmissions
over the JTAG link
RMTARGET
APPLICATION
TARGET BOARD AND
PROCESSOR
target
Fig 149. RealMonitor components
3.1.1 RMHost
This is located between a debugger and a JTAG unit. The RMHost controller,
RealMonitor.dll, converts generic Remote Debug Interface (RDI) requests from the
debugger into DCC-only RDI messages for the JTAG unit. For complete details on
debugging a RealMonitor-integrated application from the host, see the ARM RMHost User
Guide (ARM DUI 0137A).
3.1.2 RMTarget
This is pre-programmed in the on-chip ROM memory (boot sector), and runs on the target
hardware. It uses the EmbeddedICE logic, and communicates with the host using the
DCC. For more details on RMTarget functionality, see the RealMonitor Target Integration
Guide (ARM DUI 0142A).
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Chapter 35: LPC24XX RealMonitor
3.2 How RealMonitor works
In general terms, the RealMonitor operates as a state machine, as shown in
Figure 35–150. RealMonitor switches between running and stopped states, in response to
packets received by the host, or due to asynchronous events on the target. RMTarget
supports the triggering of only one breakpoint, watchpoint, stop, or semihosting SWI at a
time. There is no provision to allow nested events to be saved and restored. So, for
example, if user application has stopped at one breakpoint, and another breakpoint
occurs in an IRQ handler, RealMonitor enters a panic state. No debugging can be
performed after RealMonitor enters this state.
SWI abort
undef
stop
SWI abort
undef
RUNNING
STOPPED
PANIC
go
Fig 150. RealMonitor as a State Machine
A debugger such as the ARM eXtended Debugger (AXD) or other RealMonitor aware
debugger, that runs on a host computer, can connect to the target to send commands and
The target component of RealMonitor, RMTarget, communicates with the host component,
RMHost, using the Debug Communications Channel (DCC), which is a reliable link whose
data is carried over the JTAG connection.
While user application is running, RMTarget typically uses IRQs generated by the DCC.
This means that if user application also wants to use IRQs, it must pass any
DCC-generated interrupts to RealMonitor.
To allow nonstop debugging, the EmbeddedICE-RT logic in the processor generates a
Prefetch Abort exception when a breakpoint is reached, or a Data Abort exception when a
watchpoint is hit. These exceptions are handled by the RealMonitor exception handlers
that inform the user, by way of the debugger, of the event. This allows user application to
continue running without stopping the processor. RealMonitor considers user application
to consist of two parts:
• A foreground application running continuously, typically in User, System, or SVC
mode
• A background application containing interrupt and exception handlers that are
triggered by certain events in user system, including:
– IRQs or FIQs
– Data and Prefetch aborts caused by user foreground application. This indicates an
error in the application being debugged. In both cases the host is notified and the
user application is stopped.
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– Undef exception caused by the undefined instructions in user foreground
application. This indicates an error in the application being debugged. RealMonitor
stops the user application until a "Go" packet is received from the host.
When one of these exceptions occur that is not handled by user application, the following
happens:
• RealMonitor enters a loop, polling the DCC. If the DCC read buffer is full, control is
passed to rm_ReceiveData() (RealMonitor internal function). If the DCC write buffer is
free, control is passed to rm_TransmitData() (RealMonitor internal function). If there is
nothing else to do, the function returns to the caller. The ordering of the above
comparisons gives reads from the DCC a higher priority than writes to the
communications link.
• RealMonitor stops the foreground application. Both IRQs and FIQs continue to be
serviced if they were enabled by the application at the time the foreground application
was stopped.
4. How to enable RealMonitor
The following steps must be performed to enable RealMonitor. A code example which
implements all the steps can be found at the end of this section.
4.1 Adding stacks
User must ensure that stacks are set up within application for each of the processor
modes used by RealMonitor. For each mode, RealMonitor requires a fixed number of
words of stack space. User must therefore allow sufficient stack space for both
RealMonitor and application.
RealMonitor has the following stack requirements:
Table 683. RealMonitor stack requirement
Processor mode
Undef
RealMonitor Stack Usage (Bytes)
48
16
16
8
Prefetch Abort
Data Abort
IRQ
4.2 IRQ mode
A stack for this mode is always required. RealMonitor uses two words on entry to its
interrupt handler. These are freed before nested interrupts are enabled.
4.3 Undef mode
A stack for this mode is always required. RealMonitor uses 12 words while processing an
undefined instruction exception.
4.4 SVC mode
RealMonitor makes no use of this stack.
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4.5 Prefetch Abort mode
RealMonitor uses four words on entry to its Prefetch abort interrupt handler.
4.6 Data Abort mode
RealMonitor uses four words on entry to its data abort interrupt handler.
4.7 User/System mode
RealMonitor makes no use of this stack.
4.8 FIQ mode
RealMonitor makes no use of this stack.
4.9 Handling exceptions
This section describes the importance of sharing exception handlers between
RealMonitor and user application.
4.9.1 RealMonitor exception handling
To function properly, RealMonitor must be able to intercept certain interrupts and
itself, or shared between RealMonitor and application. If user application requires the
exception sharing, they must provide function (such as app_IRQDispatch ()). Depending
on the nature of the exception, this handler can either:
• Pass control to the RealMonitor processing routine, such as rm_irqhandler2().
• Claim the exception for the application itself, such as app_IRQHandler ().
In a simple case where an application has no exception handlers of its own, the
application can install the RealMonitor low-level exception handlers directly into the vector
table of the processor. Although the irq handler must get the address of the Vectored
Interrupt Controller. The easiest way to do this is to write a branch instruction (<address>)
into the vector table, where the target of the branch is the start address of the relevant
RealMonitor exception handler.
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RealMonitor supplied exception vector handlers
RM_UNDEF_HANDLER()
RESET
UNDEF
SWI
RM_PREFETCHABORT_HANDLER()
RM_DATAABORT_HANDLER()
RM_IRQHANDLER()
sharing IRQs between RealMonitor and user IRQ handler
RM_IRQHANDLER2()
PREFETCH
ABORT
DATA ABORT
RESERVED
IRQ
APP_IRQDISPATCH
APP_IRQHANDLER2()
OR
FIQ
Fig 151. Exception handlers
4.10 RMTarget initialization
While the processor is in a privileged mode, and IRQs are disabled, user must include a
line of code within the start-up sequence of application to call rm_init_entry().
4.11 Code example
The following example shows how to setup stack, VIC, initialize RealMonitor and share
non vectored interrupts:
IMPORT rm_init_entry
IMPORT rm_prefetchabort_handler
IMPORT rm_dataabort_handler
IMPORT rm_irqhandler2
IMPORT rm_undef_handler
IMPORT User_Entry ;Entry point of user application.
CODE32
ENTRY
;Define exception table. Instruct linker to place code at address 0x0000 0000
AREA exception_table, CODE
LDR pc, Reset_Address
LDR pc, Undefined_Address
LDR pc, SWI_Address
LDR pc, Prefetch_Address
LDR pc, Abort_Address
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NOP ; Insert User code valid signature here.
LDR pc, [pc, #-0x120] ;Load IRQ vector from VIC
LDR PC, FIQ_Address
Reset_Address
Undefined_Address
DCD __init
;Reset Entry point
DCD rm_undef_handler ;Provided by RealMonitor
SWI_Address
DCD 0
;User can put address of SWI handler here
Prefetch_Address
Abort_Address
FIQ_Address
DCD rm_prefetchabort_handler
DCD rm_dataabort_handler
;Provided by RealMonitor
;Provided by RealMonitor
DCD 0
;User can put address of FIQ handler here
AREA init_code, CODE
ram_end EQU 0x4000xxxx ; Top of on-chip RAM.
__init
; /*********************************************************************
; * Set up the stack pointers for various processor modes. Stack grows
; * downwards.
; *********************************************************************/
LDR
r2, =ram_end ;Get top of RAM
MRS r0, CPSR ;Save current processor mode
; Initialize the Undef mode stack for RealMonitor use
BIC
ORR
MSR
r1, r0, #0x1f
r1, r1, #0x1b
CPSR_c, r1
;Keep top 32 bytes for flash programming routines.
;Refer to Flash Memory System and Programming chapter
SUB
sp,r2,#0x1F
; Initialize the Abort mode stack for RealMonitor
BIC
ORR
MSR
r1, r0, #0x1f
r1, r1, #0x17
CPSR_c, r1
;Keep 64 bytes for Undef mode stack
SUB sp,r2,#0x5F
; Initialize the IRQ mode stack for RealMonitor and User
BIC
ORR
MSR
r1, r0, #0x1f
r1, r1, #0x12
CPSR_c, r1
;Keep 32 bytes for Abort mode stack
SUB sp,r2,#0x7F
; Return to the original mode.
MSR CPSR_c, r0
; Initialize the stack for user application
; Keep 256 bytes for IRQ mode stack
SUB
sp,r2,#0x17F
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; /*********************************************************************
; * Setup Vectored Interrupt controller. DCC Rx and Tx interrupts
; * generate Non Vectored IRQ request. rm_init_entry is aware
; * of the VIC and it enables the DBGCommRX and DBGCommTx interrupts.
; * Default vector address register is programmed with the address of
; * Non vectored app_irqDispatch mentioned in this example. User can setup
; * Vectored IRQs or FIQs here.
; *********************************************************************/
VICBaseAddr
EQU 0xFFFFF000 ; VIC Base address
VICDefVectAddrOffset EQU 0x34
LDR
LDR
STR
r0, =VICBaseAddr
r1, =app_irqDispatch
r1, [r0,#VICDefVectAddrOffset]
BL
rm_init_entry
;Initialize RealMonitor
;enable FIQ and IRQ in ARM Processor
MRS
BIC
MSR
r1, CPSR
r1, r1, #0xC0
CPSR_c, r1
; get the CPSR
; enable IRQs and FIQs
; update the CPSR
; /*********************************************************************
; * Get the address of the User entry point.
; *********************************************************************/
LDR
MOV
lr, =User_Entry
pc, lr
; /*********************************************************************
; * Non vectored irq handler (app_irqDispatch)
; *********************************************************************/
AREA app_irqDispatch, CODE
VICVectAddrOffset EQU 0x30
app_irqDispatch
;enable interrupt nesting
STMFD sp!, {r12,r14}
MRS
MSR
r12, spsr
cpsr_c,0x1F
;Save SPSR in to r12
;Re-enable IRQ, go to system mode
;User should insert code here if non vectored Interrupt sharing is
;required. Each non vectored shared irq handler must return to
;the interrupted instruction by using the following code.
;
;
;
;
;
;
;
MSR
MSR
cpsr_c, #0x52
spsr, r12
;Disable irq, move to IRQ mode
;Restore SPSR from r12
STMFD sp!, {r0}
LDR
STR
LDMFD sp!, {r12,r14,r0}
SUBS pc, r14, #4
r0, =VICBaseAddr
r1, [r0,#VICVectAddrOffset]
;Acknowledge Non Vectored irq has finished
;Restore registers
;Return to the interrupted instruction
;user interrupt did not happen so call rm_irqhandler2. This handler
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;is not aware of the VIC interrupt priority hardware so trick
;rm_irqhandler2 to return here
STMFD sp!, {ip,pc}
LDR
pc, rm_irqhandler2
;rm_irqhandler2 returns here
MSR
MSR
cpsr_c, #0x52
spsr, r12
;Disable irq, move to IRQ mode
;Restore SPSR from r12
STMFD sp!, {r0}
LDR
STR
r0, =VICBaseAddr
r1, [r0,#VICVectAddrOffset]
;Acknowledge Non Vectored irq has finished
;Restore registers
;Return to the interrupted instruction
LDMFD sp!, {r12,r14,r0}
SUBS pc, r14, #4
END
5. RealMonitor build options
RealMonitor was built with the following options:
RM_OPT_DATALOGGING=FALSE
This option enables or disables support for any target-to-host packets sent on a non
RealMonitor (third-party) channel.
RM_OPT_STOPSTART=TRUE
This option enables or disables support for all stop and start debugging features.
RM_OPT_SOFTBREAKPOINT=TRUE
This option enables or disables support for software breakpoints.
RM_OPT_HARDBREAKPOINT=TRUE
Enabled for cores with EmbeddedICE-RT. This device uses ARM-7TDMI-S Rev 4 with
EmbeddedICE-RT.
RM_OPT_HARDWATCHPOINT=TRUE
Enabled for cores with EmbeddedICE-RT. This device uses ARM-7TDMI-S Rev 4 with
EmbeddedICE-RT.
RM_OPT_SEMIHOSTING=FALSE
This option enables or disables support for SWI semi-hosting. Semi-hosting provides
code running on an ARM target use of facilities on a host computer that is running an
ARM debugger. Examples of such facilities include the keyboard input, screen output,
and disk I/O.
RM_OPT_SAVE_FIQ_REGISTERS=TRUE
This option determines whether the FIQ-mode registers are saved into the registers
block when RealMonitor stops.
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RM_OPT_READBYTES=TRUE
RM_OPT_WRITEBYTES=TRUE
RM_OPT_READHALFWORDS=TRUE
RM_OPT_WRITEHALFWORDS=TRUE
RM_OPT_READWORDS=TRUE
RM_OPT_WRITEWORDS=TRUE
Enables/Disables support for 8/16/32 bit read/write.
RM_OPT_EXECUTECODE=FALSE
Enables/Disables support for executing code from "execute code" buffer. The code
must be downloaded first.
RM_OPT_GETPC=TRUE
This option enables or disables support for the RealMonitor GetPC packet. Useful in
code profiling when real monitor is used in interrupt mode.
RM_EXECUTECODE_SIZE=NA
"execute code" buffer size. Also refer to RM_OPT_EXECUTECODE option.
RM_OPT_GATHER_STATISTICS=FALSE
This option enables or disables the code for gathering statistics about the internal
operation of RealMonitor.
RM_DEBUG=FALSE
This option enables or disables additional debugging and error-checking code in
RealMonitor.
RM_OPT_BUILDIDENTIFIER=FALSE
This option determines whether a build identifier is built into the capabilities table of
RMTarget. Capabilities table is stored in ROM.
RM_OPT_SDM_INFO=FALSE
SDM gives additional information about application board and processor to debug tools.
RM_OPT_MEMORYMAP=FALSE
This option determines whether a memory map of the board is built into the target and
made available through the capabilities table
RM_OPT_USE_INTERRUPTS=TRUE
This option specifies whether RMTarget is built for interrupt-driven mode or polled
mode.
RM_FIFOSIZE=NA
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This option specifies the size, in words, of the data logging FIFO buffer.
CHAIN_VECTORS=FALSE
This option allows RMTarget to support vector chaining through µHAL (ARM HW
abstraction API).
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1. Abbreviations
Table 684. Acronyms and abbreviations
Acronym
ADC
AHB
AMBA
APB
BLS
Description
Analog-to-Digital Converter
Advanced High-performance Bus
Advanced Microcontroller Bus Architecture
Advanced Peripheral Bus
Byte Lane Select
BOD
CAN
DAC
DCC
DMA
DSP
EOP
ETM
GPIO
JTAG
MII
BrownOut Detection
Controller Area Network
Digital-to-Analog Converter
Debug Communication Channel
Direct Memory Access
Digital Signal Processing
End Of Packet
Embedded Trace Macrocell
General Purpose Input/Output
Joint Test Action Group
Media Independent Interface
Physical Layer
PHY
PLL
Phase-Locked Loop
PWM
RMII
SE0
Pulse Width Modulator
Reduced Media Independent Interface
Single Ended Zero
SPI
Serial Peripheral Interface
Synchronous Serial Interface
Synchronous Serial Port
Transistor-Transistor Logic
Universal Asynchronous Receiver/Transmitter
Universal Serial Bus
SSI
SSP
TTL
UART
USB
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2. Legal information
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors accepts no liability for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
2.1
Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
2.2
Disclaimers
General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.
2.3
Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
SoftConnect — is a trademark of NXP B.V.
GoodLink — is a trademark of NXP B.V.
I2C-bus — logo is a trademark of NXP B.V.
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Chapter 36: LPC24XX Supplementary information
3. Tables
Table 21. Memory Mapping control register (MEMMAP -
address 0xE01F C040) bit description . . . . . . .25
Table 25. External Interrupt Flag register (EXTINT - address
0xE01F C140) bit description . . . . . . . . . . . . . .30
Table 26. External Interrupt Mode register (EXTMODE -
address 0xE01F C148) bit description . . . . . . .31
Table 27. External Interrupt Polarity register (EXTPOLAR -
address 0xE01F C14C) bit description. . . . . . .32
Table 28. Reset Source Identification register (RSID -
address 0xE01F C180) bit description . . . . . . .35
Table 29. System Controls and Status register (SCS -
address 0xE01F C1A0) bit description . . . . . . .35
Table 31. AHB Arbiter Configuration register 1 (AHBCFG1 -
address 0xE01F C188) bit description . . . . . . .37
Table 32. Priority sequence (bit 0 = 0): LCD, CPU, GPDMA,
AHB1, USB. . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Table 33. Priority sequence (bit 0 = 0): USB, AHB1, CPU,
GPDMA, LCD . . . . . . . . . . . . . . . . . . . . . . . . . .38
Table 34. Priority sequence (bit 0 = 0): GPDMA, AHB1,
CPU, LCD, USB . . . . . . . . . . . . . . . . . . . . . . . .38
Table 35. Priority sequence (bit 0 = 0): USB, AHB1, CPU,
GPDMA, LCD . . . . . . . . . . . . . . . . . . . . . . . . . .38
Table 36. AHB Arbiter Configuration register 2 (AHBCFG2 -
address 0xE01F C18C) bit description. . . . . . .39
parameters) high frequency mode (OSCRANGE =
1, see Table 3–29) . . . . . . . . . . . . . . . . . . . . . . 44
Table 42. Clock Source Select register (CLKSRCSEL -
address 0xE01F C10C) bit description . . . . . . 46
Table 44. PLL Control register (PLLCON - address
0xE01F C080) bit description. . . . . . . . . . . . . . 48
Table 45. PLL Configuration register (PLLCFG - address
0xE01F C084) bit description. . . . . . . . . . . . . . 49
Table 47. PLL Status register (PLLSTAT - address
0xE01F C088) bit description. . . . . . . . . . . . . . 51
Table 49. PLL Feed register (PLLFEED - address
0xE01F C08C) bit description . . . . . . . . . . . . . 52
Table 51. Additional Multiplier Values for use with a Low
Frequency Clock Input. . . . . . . . . . . . . . . . . . . 53
Table 53. CPU Clock Configuration register (CCLKCFG -
address 0xE01F C104) bit description. . . . . . . 57
Table 54. USB Clock Configuration register (USBCLKCFG -
address 0xE01F C108) bit description. . . . . . . 57
Table 55. IRC Trim register (IRCTRIM - address
0xE01F C1A4) bit description . . . . . . . . . . . . . 58
Table 56. Peripheral Clock Selection register 0 (PCLKSEL0
- address 0xE01F C1A8) bit description . . . . . 58
Table 57. Peripheral Clock Selection register 1 (PCLKSEL1
- address 0xE01F C1AC) bit description . . . . . 58
Table 60. Power Mode Control register (PCON - address
0xE01F C0C0) bit description . . . . . . . . . . . . . 61
Table 62. Interrupt Wakeup register (INTWAKE - address
0xE01F C144) bit description. . . . . . . . . . . . . . 63
Table 63. Power Control for Peripherals register (PCONP -
address 0xE01F C0C4) bit description . . . . . . 64
Table 68. EMC Control register (EMCControl - address
0xFFE0 8000) bit description. . . . . . . . . . . . . . 76
Table 69. EMC Status register (EMCStatus - address
0xFFE0 8008) bit description. . . . . . . . . . . . . . 77
Table 70. EMC Configuration register (EMCConfig -
address 0xFFE0 8008) bit description . . . . . . . 78
Table 71. Dynamic Control register (EMCDynamicControl -
address 0xFFE0 8020) bit description . . . . . . . 78
Table 72. Dynamic Memory Refresh Timer register
mode (crystal and external components
parameters) low frequency mode (OSCRANGE =
0, see Table 3–29) . . . . . . . . . . . . . . . . . . . . . .44
mode (crystal and external components
bit description. . . . . . . . . . . . . . . . . . . . . . . . . . 80
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Table 92. Static Memory Read Delay registers
Table 74. Dynamic Memory Percentage Command Period
(EMCStaticWaitRd0-3 - address 0xFFE0 820C,
0xFFE0 822C, 0xFFE0 824C, 0xFFE0 826C) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table 93. Static Memory Page Mode Read Delay
registers0-3 (EMCStaticWaitPage0-3 - address
0xFFE0 8210, 0xFFE0 8230, 0xFFE0 8250,
0xFFE0 8270) bit description. . . . . . . . . . . . . . 94
Table 94. Static Memory Write Delay registers0-3
(EMCStaticWaitWr - address 0xFFE0 8214,
0xFFE0 8030) bit description . . . . . . . . . . . . . .82
Table 75. Dynamic Memory Active to Precharge Command
0xFFE0 8034) bit description . . . . . . . . . . . . . .82
Table 76. Dynamic Memory Self-refresh Exit Time register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Table 77. Memory Last Data Out to Active Time register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Table 78. Dynamic Memory Data-in to Active Command
0xFFE0 8040) bit description . . . . . . . . . . . . . .84
Table 79. Dynamic Memory Write recover Time register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
Table 80. Dynamic Mempry Active to Active Command
0xFFE0 8048) bit description . . . . . . . . . . . . . .85
Table 81. Dynamic Memory Auto-refresh Period register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Table 82. Dynamic Memory Exit Self-refresh register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Table 83. Dynamic Memory Acitve Bank A to Active Bank B
0xFFE0 8054) bit description . . . . . . . . . . . . . .86
Table 84. Dynamic Memory Load Mode register to Active
0xFFE0 8058) bit description . . . . . . . . . . . . . .87
Table 85. Static Memory Extended Wait register
0xFFE0 8234, 0xFFE0 8254, 0xFFE0 8274) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Table 95. Static Memory Trun Round Delay registers0-3
(EMCStaticWaitTurn0-3 - address 0xFFE0 8218,
0xFFE0 8238, 0xFFE0 8258, 0xFFE0 8278) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Table 96. MAM responses to program accesses of various
types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Table 97. MAM responses to data and DMA accesses of
various types . . . . . . . . . . . . . . . . . . . . . . . . . 103
Table 98. Summary of Memory Acceleration Module
registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Table 99. MAM Control Register (MAMCR - address
0xE01F C000) bit description. . . . . . . . . . . . . 104
Table 100.MAM Timing register (MAMTIM - address
0xE01F C004) bit description. . . . . . . . . . . . . 105
Table 103.Software Interrupt register (VICSoftInt - address
0xFFFF F018) bit description. . . . . . . . . . . . . 111
Table 104.Software Interrupt Clear register (VICSoftIntClear
- address 0xFFFF F01C) bit description . . . . 111
Table 105.Raw Interrupt Status register (VICRawIntr -
address 0xFFFF F008) bit description. . . . . . 112
Table 106.Interrupt Enable register (VICIntEnable - address
0xFFFF F010) bit description. . . . . . . . . . . . . 112
Table 107.Interrupt Enable Clear register (VICIntEnClear -
address 0xFFFF F014) bit description. . . . . . 112
Table 108.Interrupt Select register (VICIntSelect - address
0xFFFF F00C) bit description . . . . . . . . . . . . 113
Table 109.IRQ Status register (VICIRQStatus - address
0xFFFF F000) bit description. . . . . . . . . . . . . 113
Table 110.FIQ Status register (VICFIQStatus - address
0xFFFF F004) bit description. . . . . . . . . . . . . 113
Table 111. Vector Address registers 0-31 (VICVectAddr0-31 -
0xFFE0 8080) bit description . . . . . . . . . . . . . .87
Table 86. Dynamic Memory Configuration registers
(EMCDynamicConfig0-3 - address 0xFFE0 8100,
0xFFE0 8120, 0xFFE0 8140, 0xFFE0 8160) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Table 88. Dynamic Memory RAS & CAS Delay registers
(EMCDynamicRasCas0-3 - address
0xFFE0 8104, 0xFFE0 8124, 0xFFE0 8144,
0xFFE0 8164) bit description . . . . . . . . . . . . . .90
Table 89. Static Memory Configuration registers
(EMCStaticConfig0-3 - address 0xFFE0 8200,
0xFFE0 8220, 0xFFE0 8240, 0xFFE0 8260) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
Table 90. Static Memory Write Enable Delay registers
(EMCStaticWaitWen0-3 - address
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Table 112.Vector Priority registers 0-31 (VICVectPriority0-31
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Table 113.Vector Address register (VICAddress - address
0xFFFF FF00) bit description. . . . . . . . . . . . . 114
Table 114.Software Priority Mask register
0xFFE0 8204,0xFFE0 8224, 0xFFE0 8244,
0xFFE0 8264) bit description . . . . . . . . . . . . . .93
Table 91. Static Memory Output Enable delay registers
(EMCStaticWaitOen03 - address 0xFFE0 8208,
0xFFE0 8228, 0xFFE0 8248, 0xFFE0 8268) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Table 115.Protection Enable register (VICProtection -
address 0xFFFF F020) bit description. . . . . . 115
UM10237_2
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Chapter 36: LPC24XX Supplementary information
Table 150.Pin Mode select register 4 (PINMODE4 - address
0xE002 C050) bit description. . . . . . . . . . . . . 191
Table 151.Pin Mode select register 5 (
Table 125.Boot control on pins P3[15]/D15 and
P3/14]/D14 . . . . . . . . . . . . . . . . . . . . . . . . . . .174
Table 130.Pin function select register 0 (PINSEL0 - address
0xE002 C000) bit description . . . . . . . . . . . . .178
Table 131.Pin function select register 1 (PINSEL1 - address
0xE002 C004) bit description . . . . . . . . . . . . .179
Table 132.Pin function select register 2 (PINSEL2 - address
0xE002 C008) bit description . . . . . . . . . . . . .180
Table 133.Pin function select register 3 (PINSEL3 - address
0xE002 C00C) bit description. . . . . . . . . . . . .181
Table 134.LPC2458 pin function select register 4 (PINSEL4
- address 0xE002 C010) bit description . . . . .182
Table 135.LPC2420/60/68/70/78 pin function select register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .182
Table 136.LPC2458 pin function select register 5 (PINSEL5
- address 0xE002 C014) bit description . . . . .184
Table 137.LPC2420/60/68/70/78 pin function select register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .184
Table 138.Pin function select register 6 (PINSEL6 - address
0xE002 C018) bit description . . . . . . . . . . . . .185
Table 139.LPC2458 pin function select register 7 (PINSEL7
- address 0xE002 C01C) bit description. . . . .185
Table 140.LPC24520/60/68/70/78 pin function select
description . . . . . . . . . . . . . . . . . . . . . . . . . . .186
Table 141.Pin function select register 8 (PINSEL8 - address
0xE002 C020) bit description . . . . . . . . . . . . .187
Table 142.LPC2458 pin function select register 9 (PINSEL9
- address 0xE002 C024) bit description . . . . .187
Table 143.LPC2420/60/68/70/78 pin function select register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .188
Table 144.Pin function select register 10 (PINSEL10 -
address 0xE002 C028) bit description . . . . . .189
Table 145.Pin function select register 11 (PINSEL11 -
address 0xE002 C02C) bit description . . . . . .189
Table 146.Pin Mode select register 0 (PINMODE0 - address
0xE002 C040) bit description . . . . . . . . . . . . .189
Table 147.Pin Mode select register 1 (PINMODE1 - address
0xE002 C044) bit description . . . . . . . . . . . . .190
Table 148.Pin Mode select register 2 (PINMODE2 - address
0xE002 C048) bit description . . . . . . . . . . . . .190
Table 149.Pin Mode select register 3 (PINMODE3 - address
address 0xE002 C054) bit description. . . . . . 191
Table 152.Pin Mode select register 6 (PINMODE6 - address
0xE002 C058) bit description. . . . . . . . . . . . . 191
Table 153.Pin Mode select register 7 (PINMODE7 - address
0xE002 C05C) bit description . . . . . . . . . . . . 191
Table 154.Pin Mode select register 8 (PINMODE8 - address
0xE002 C060) bit description. . . . . . . . . . . . . 192
Table 155.Pin Mode select register 9 (PINMODE9 - address
0xE002 C064) bit description. . . . . . . . . . . . . 192
Table 158.Summary of GPIO registers (legacy APB
accessible registers) . . . . . . . . . . . . . . . . . . . 196
Table 159.Summary of GPIO registers (local bus accessible
registers - enhanced GPIO features). . . . . . . 197
Table 161.GPIO port Direction register (IO0DIR - address
0xE002 8018) bit description . . . . . . . . . . . . . 198
Table 162.Fast GPIO port Direction register
0x3FFF C0[0/2/4/6/8]0) bit description. . . . . . 198
Table 163.Fast GPIO port Direction control byte and
half-word accessible register description. . . . 199
Table 164.GPIO port output Set register (IO0SET - address
0xE002 8014) bit description . . . . . . . . . . . . . 200
Table 165.Fast GPIO port output Set register
0x3FFF C0[1/3/5/7/9]8) bit description. . . . . . 200
Table 166.Fast GPIO port output Set byte and half-word
accessible register description. . . . . . . . . . . . 200
Table 167.GPIO port output Clear register (IO0CLR -
0xE002 801C) bit description. . . . . . . . . . . . . 201
Table 168.Fast GPIO port output Clear register
0x3FFF C0[1/3/5/7/9]C) bit description . . . . . 201
Table 169.Fast GPIO port output Clear byte and half-word
accessible register description. . . . . . . . . . . . 202
Table 170.GPIO port Pin value register (IO0PIN - address
0xE002 8010) bit description . . . . . . . . . . . . . 203
Table 171.Fast GPIO port Pin value register
0x3FFF C0[1/3/5/7/9]4) bit description. . . . . . 203
Table 172.Fast GPIO port Pin value byte and half-word
accessible register description. . . . . . . . . . . . 204
Table 173.Fast GPIO port Mask register
0x3FFF C0[1/3/5/7/9]0) bit description. . . . . . 205
UM10237_2
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Chapter 36: LPC24XX Supplementary information
Table 175.GPIO overall Interrupt Status register (IOIntStatus
- address 0xE002 8080) bit description . . . . .206
Table 176.GPIO Interrupt Enable for Rising edge register
(IO0IntEnR - address 0xE002 8090 and
Table 204.Station Address register (SA1 - address
0xFFE0 0044) bit description. . . . . . . . . . . . . 227
Table 205.Station Address register (SA2 - address
0xFFE0 0048) bit description. . . . . . . . . . . . . 227
Table 206.Command register (Command - address
0xFFE0 0100) bit description. . . . . . . . . . . . . 227
Table 207.Status register (Status - address 0xFFE0 0104) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Table 208.Receive Descriptor Base Address register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Table 209.receive Status Base Address register (RxStatus -
address 0xFFE0 010C) bit description. . . . . . 229
Table 210.Receive Number of Descriptors register
IO2IntEnR - address 0xE002 80B0)
bit description . . . . . . . . . . . . . . . . . . . . . . . . .206
Table 177.GPIO Interrupt Enable for Falling edge register
(IO0IntEnF - address 0xE002 8094 and
IO2IntEnF - address 0xE002 80B4)
bit description . . . . . . . . . . . . . . . . . . . . . . . . .206
Table 178.GPIO Status for Rising edge register (IO0IntStatR
0xE002 80A4) bit description . . . . . . . . . . . . .207
Table 179.GPIO Status for Falling edge register (IO0IntStatF
0xE002 80A8) bit description . . . . . . . . . . . . .207
Table 180.GPIO Status for Falling edge register (IO0IntClr -
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Table 211.Receive Produce Index register (RxProduceIndex
- address 0xFFE0 0114) bit description . . . . . 229
Table 212.Receive Consume Index register
0xE002 80AC) bit description. . . . . . . . . . . . .207
Table 181.Ethernet acronyms, abbreviations,
and definitions . . . . . . . . . . . . . . . . . . . . . . . .211
Table 187.MAC Configuration register 1 (MAC1 - address
0xFFE0 0000) bit description . . . . . . . . . . . . .220
Table 188.MAC Configuration register 2 (MAC2 - address
0xFFE0 0004) bit description . . . . . . . . . . . . .220
Table 190.Back-to-back Inter-packet-gap register (IPGT -
address 0xFFE0 0008) bit description . . . . . .222
Table 191. Non Back-to-back Inter-packet-gap register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .222
Table 192.Collision Window / Retry register (CLRT - address
0xFFE0 0010) bit description . . . . . . . . . . . . .223
Table 193.Maximum Frame register (MAXF - address
0xFFE0 0014) bit description . . . . . . . . . . . . .223
Table 194.PHY Support register (SUPP - address
0xFFE0 0018) bit description . . . . . . . . . . . . .223
Table 195. Test register (TEST - address 0xFFE0 ) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . .224
Table 196.MII Mgmt Configuration register (MCFG - address
0xFFE0 0020) bit description . . . . . . . . . . . . .224
Table 198.MII Mgmt Command register (MCMD - address
0xFFE0 0024) bit description . . . . . . . . . . . . .225
Table 199.MII Mgmt Address register (MADR - address
0xFFE0 0028) bit description . . . . . . . . . . . . .225
Table 200.MII Mgmt Write Data register (MWTD - address
0xFFE0 002C) bit description. . . . . . . . . . . . .225
Table 201.MII Mgmt Read Data register (MRDD - address
0xFFE0 0030) bit description . . . . . . . . . . . . .225
Table 202.MII Mgmt Indicators register (MIND - address
0xFFE0 0034) bit description . . . . . . . . . . . . .226
Table 203.Station Address register (SA0 - address
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Table 213.Transmit Descriptor Base Address register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Table 214.Transmit Status Base Address register (TxStatus -
address 0xFFE0 0120) bit description . . . . . . 231
Table 215.Transmit Number of Descriptors register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Table 216.Transmit Produce Index register (TxProduceIndex
- address 0xFFE0 0128) bit description. . . . . 231
Table 217.Transmit Consume Index register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Table 218. Transmit Status Vector 0 register (TSV0 - address
0xFFE0 0158) bit description. . . . . . . . . . . . . 232
Table 219.Transmit Status Vector 1 register (TSV1 - address
0xFFE0 015C) bit description . . . . . . . . . . . . 233
Table 220.Receive Status Vector register (RSV - address
0xFFE0 0160) bit description. . . . . . . . . . . . . 234
Table 221.Flow Control Counter register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Table 222.Flow Control Status register (FlowControlStatus -
address 0xFFE0 8174) bit description . . . . . . 235
Table 223.Receive Filter Control register (RxFilterCtrl -
address 0xFFE0 0200) bit description . . . . . . 235
Table 224.Receive Filter WoL Status register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Table 225.Receive Filter WoL Clear register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Table 226.Hash Filter Table LSBs register (HashFilterL -
address 0xFFE0 0210) bit description . . . . . . 237
UM10237_2
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Chapter 36: LPC24XX Supplementary information
Table 228.Interrupt Status register (IntStatus - address
0xFFE0 0FE0) bit description. . . . . . . . . . . . .238
Table 229.Interrupt Enable register (intEnable - address
0xFFE0 0FE4) bit description. . . . . . . . . . . . .238
Table 230.Interrupt Clear register (IntClear - address
0xFFE0 0FE8) bit description. . . . . . . . . . . . .239
Table 231.Interrupt Set register (IntSet - address
0xFFE0 0FEC) bit description. . . . . . . . . . . . .240
Table 232.Power Down register (PowerDown - address
0xFFE0 0FF4) bit description . . . . . . . . . . . . .240
Table 246.FIFO bits for Little-endian Byte, Little-endian Pixel
order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .288
Table 247.FIFO bits for Big-endian Byte, Big-endian Pixel
order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .289
Table 248.FIFO bits for Little-endian Byte, Big-endian Pixel
order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .290
Table 252.Palette data storage for STN monochrome
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .293
Table 267.LCD Control register (LCD_CTRL, RW - 0xFFE1
0018) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
Table 268.Interrupt Mask register (LCD_INTMSK, RW -
0xFFE1 001C) . . . . . . . . . . . . . . . . . . . . . . . . 312
Table 269.Raw Interrupt Status register (LCD_INTRAW, RW
- 0xFFE1 0020) . . . . . . . . . . . . . . . . . . . . . . . 313
Table 270.Masked Interrupt Status register (LCD_INTSTAT,
RW - 0xFFE1 0024). . . . . . . . . . . . . . . . . . . . 314
Table 271.Interrupt Clear register (LCD_INTCLR, RW -
0xFFE1 0028) . . . . . . . . . . . . . . . . . . . . . . . . 314
Table 272.Upper Panel Current Address register
(LCD_UPCURR, RW - 0xFFE1 002C). . . . . . 315
Table 273.Lower Panel Current Address register
(LCD_LPCURR, RW - 0xFFE1 0030) . . . . . . 315
Table 274.Color Palette registers (LCD_PAL, RW - 0xFFE1
0200 to 0xFFE1 03FC) . . . . . . . . . . . . . . . . . 316
Table 275.Cursor Image registers (CRSR_IMG, RW -
0xFFE1 0800 to 0xFFE1 0BFC) . . . . . . . . . . 317
Table 276.Cursor Control register (CRSR_CTRL, RW -
0xFFE1 0C00) . . . . . . . . . . . . . . . . . . . . . . . . 317
Table 277.Cursor Configuration register (CRSR_CFG, RW -
0xFFE1 0C04) . . . . . . . . . . . . . . . . . . . . . . . . 318
Table 278.Cursor Palette register 0 (CRSR_PAL0, RW -
0xFFE1 0C08) . . . . . . . . . . . . . . . . . . . . . . . . 318
Table 279.Cursor Palette register 1 (CRSR_PAL1, RW -
0xFFE1 0C0C). . . . . . . . . . . . . . . . . . . . . . . . 319
Table 280.Cursor XY Position register (CRSR_XY, RW -
0xFFE1 0C10) . . . . . . . . . . . . . . . . . . . . . . . . 319
Table 281.Cursor Clip Position register (CRSR_CLIP, RW -
0xFFE1 0C14) . . . . . . . . . . . . . . . . . . . . . . . . 320
Table 282.Cursor Interrupt Mask register (CRSR_INTMSK,
RW - 0xFFE1 0C20). . . . . . . . . . . . . . . . . . . . 320
Table 283.Cursor Interrupt Clear register (CRSR_INTCLR,
RW - 0xFFE1 0C24). . . . . . . . . . . . . . . . . . . . 320
Table 284.Cursor Raw Interrupt Status register
(CRSR_INTRAW, RW - 0xFFE1 0C28) . . . . . 321
Table 285.Cursor Masked Interrupt Status register
(CRSR_INTSTAT, RW - 0xFFE1 0C2C) . . . . 321
Table 286.LCD panel connections for STN single panel
mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Table 287.LCD panel connections for STN dual panel mode
325
Table 289.USB related acronyms, abbreviations, and
definitions used in this chapter. . . . . . . . . . . . 328
Table 294.USB Port Select register (USBPortSel - address
0xFFE0 C110) bit description. . . . . . . . . . . . . 337
Table 295.USBClkCtrl register (USBClkCtrl - address
0xFFE0 CFF4) bit description . . . . . . . . . . . . 337
Table 296.USB Clock Status register (USBClkSt - 0xFFE0
CFF8) bit description . . . . . . . . . . . . . . . . . . . 338
Table 297.USB Interrupt Status register (USBIntSt - address
0xE01F C1C0) bit description . . . . . . . . . . . . 338
Table 253.Palette data storage for STN monochrome
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .294
Table 255.Buffer to pixel mapping for 32 x 32 pixel cursor
format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .297
Table 256.Buffer to pixel mapping for 64 x 64 pixel cursor
format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .297
Table 260.LCD Configuration register (LCD_CFG, RW -
0xE01F C1B8) . . . . . . . . . . . . . . . . . . . . . . . .303
Table 261.Horizontal Timing register (LCD_TIMH, RW -
0xFFE1 0000). . . . . . . . . . . . . . . . . . . . . . . . .304
Table 262.Vertical Timing register (LCD_TIMV, RW - 0xFFE1
0004) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .305
Table 263.Clock and Signal Polarity register (LCD_POL, RW
- 0xFFE1 0008). . . . . . . . . . . . . . . . . . . . . . . .306
Table 264.Line End Control register (LCD_LE, RW - 0xFFE1
000C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .309
Table 265.Upper Panel Frame Base register
(LCD_UPBASE, RW - 0xFFE1 0010). . . . . . .309
Table 266.Lower Panel Frame Base register
(LCD_LPBASE, RW - 0xFFE1 0014) . . . . . . .310
UM10237_2
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Chapter 36: LPC24XX Supplementary information
(USBDevIntSt - address 0xFFE0 C200) bit
Table 320.USB MaxPacketSize register (USBMaxPSize -
address 0xFFE0 C24C) bit description. . . . . 348
Table 321.USB Receive Data register (USBRxData -
address 0xFFE0 C218) bit description . . . . . 349
Table 322.USB Receive Packet Length register (USBRxPlen
- address 0xFFE0 C220) bit description . . . . 350
Table 323.USB Transmit Data register (USBTxData -
address 0xFFE0 C21C) bit description. . . . . 350
Table 324.USB Transmit Packet Length register
allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . .339
Table 299.USB Device Interrupt Status register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .339
Table 300.USB Device Interrupt Enable register
allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . .340
Table 301.USB Device Interrupt Enable register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .340
Table 302.USB Device Interrupt Clear register
allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . .341
Table 303.USB Device Interrupt Clear register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .341
Table 304.USB Device Interrupt Set register (USBDevIntSet
- address 0xFFE0 C20C) bit allocation . . . . .341
Table 305.USB Device Interrupt Set register (USBDevIntSet
- address 0xFFE0 C20C) bit description . . . .341
Table 306.USB Device Interrupt Priority register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .342
Table 307.USB Endpoint Interrupt Status register
allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . .342
Table 308.USB Endpoint Interrupt Status register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .343
Table 309.USB Endpoint Interrupt Enable register
allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . .344
Table 310.USB Endpoint Interrupt Enable register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .344
Table 311.USB Endpoint Interrupt Clear register
allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . .344
Table 312.USB Endpoint Interrupt Clear register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .345
Table 313.USB Endpoint Interrupt Set register (USBEpIntSet
- address 0xFFE0 C23C) bit allocation . . . . .345
Table 314.USB Endpoint Interrupt Set register (USBEpIntSet
- address 0xFFE0 C23C) bit description . . . .345
Table 315.USB Endpoint Interrupt Priority register
allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . .346
Table 316.USB Endpoint Interrupt Priority register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .346
Table 317.USB Realize Endpoint register (USBReEp -
address 0xFFE0 C244) bit allocation . . . . . .347
Table 318.USB Realize Endpoint register (USBReEp -
address 0xFFE0 C244) bit description . . . . .347
Table 319.USB Endpoint Index register (USBEpIn - address
0xFFE0 C248) bit description . . . . . . . . . . . .348
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Table 325.USB Control register (USBCtrl - address 0xFFE0
C228) bit description. . . . . . . . . . . . . . . . . . . 351
Table 326.USB Command Code register (USBCmdCode -
address 0xFFE0 C210) bit description . . . . . 352
Table 327.USB Command Data register (USBCmdData -
address 0xFFE0 C214) bit description . . . . . 352
Table 328.USB DMA Request Status register (USBDMARSt
- address 0xFFE0 C250) bit allocation . . . . . 352
Table 329.USB DMA Request Status register (USBDMARSt
- address 0xFFE0 C250) bit description . . . . 353
Table 330.USB DMA Request Clear register (USBDMARClr
- address 0xFFE0 C254) bit description . . . . 353
Table 331.USB DMA Request Set register (USBDMARSet -
address 0xFFE0 C258) bit description . . . . . 354
Table 332.USB UDCA Head register (USBUDCAH - address
0xFFE0 C280) bit description . . . . . . . . . . . . 354
Table 333.USB EP DMA Status register (USBEpDMASt -
address 0xFFE0 C284) bit description . . . . . 354
Table 334.USB EP DMA Enable register (USBEpDMAEn -
address 0xFFE0 C288) bit description . . . . . 355
Table 335.USB EP DMA Disable register (USBEpDMADis -
address 0xFFE0 C28C) bit description. . . . . 355
Table 336.USB DMA Interrupt Status register (USBDMAIntSt
- address 0xFFE0 C290) bit description . . . . 356
Table 337.USB DMA Interrupt Enable register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
Table 338.USB End of Transfer Interrupt Status register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Table 339.USB End of Transfer Interrupt Clear register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Table 340.USB End of Transfer Interrupt Set register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Table 341.USB New DD Request Interrupt Status register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Table 342.USB New DD Request Interrupt Clear register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
Table 343.USB New DD Request Interrupt Set register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
UM10237_2
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Chapter 36: LPC24XX Supplementary information
Table 345.USB System Error Interrupt Clear register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .359
Table 346.USB System Error Interrupt Set register
U3THR - 0xE007 C000 when DLAB = 0, Write
Only) bit description . . . . . . . . . . . . . . . . . . . . 426
Table 380:UARTn Divisor Latch LSB Register (U0DLL -
address 0xE000 C000, U2DLL - 0xE007 8000,
U3DLL - 0xE007 C000 when DLAB = 1) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
Table 381:UARTn Divisor Latch MSB Register (U0DLM -
address 0xE000 C004, U2DLM - 0xE007 8004,
U3DLM - 0xE007 C004 when DLAB = 1) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . .359
Table 358.USB (OHCI) related acronyms and abbreviations
used in this chapter . . . . . . . . . . . . . . . . . . . .388
Table 362.USB OTG and I2C register address
definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . .399
Table 363.USB Interrupt Status register - (USBIntSt -
address 0xE01F C1) bit description . . . . . . . .400
Table 364.OTG Interrupt Status register (OTGIntSt - address
0xE01F C100) bit description . . . . . . . . . . . . .401
Table 365.OTG Status Control register (OTGStCtrl - address
0xFFE0 C110) bit description . . . . . . . . . . . . .402
Table 367.OTG Timer register (OTGTmr - address
0xFFE0 C114) bit description . . . . . . . . . . . . .403
Table 368.OTG_clock_control register (OTG_clock_control -
address 0xFFE0 CFF4) bit description. . . . . .403
Table 369.OTG_clock_status register (OTGClkSt - address
0xFFE0 CFF8) bit description. . . . . . . . . . . . .404
Table 370.I2C Receive register (I2C_RX - address
0xFFE0 C300) bit description. . . . . . . . . . . . .405
Table 371.I2C Transmit register (I2C_TX - address
0xFFE0 C300) bit description. . . . . . . . . . . . .405
Table 372.I2C status register (I2C_STS - address
0xFFE0 C304) bit description. . . . . . . . . . . . .406
Table 373.I2C Control register (I2C_CTL - address
0xFFE0 C308) bit description. . . . . . . . . . . . .407
Table 374.I2C_CLKHI register (I2C_CLKHI - address
0xFFE0 C30C) bit description. . . . . . . . . . . . .408
Table 375.I2C_CLKLO register (I2C_CLKLO - address
0xFFE0 C310) bit description. . . . . . . . . . . . .409
Table 378:UARTn Receiver Buffer Register (U0RBR -
address 0xE000 C000, U2RBR - 0xE007 8000,
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
Table 382:UARTn Interrupt Enable Register (U0IER -
address 0xE000 C004, U2IER - 0xE007 8004,
U3IER - 0xE007 C004 when DLAB = 0) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
Table 383:UARTn Interrupt Identification Register (U0IIR -
address 0xE000 C008, U2IIR - 0x7008 8008,
U3IIR - 0x7008 C008, Read Only) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 428
Table 385:UARTn FIFO Control Register (U0FCR - address
0xE007 C008, Write Only) bit description . . . 430
Table 386:UARTn Line Control Register (U0LCR - address
0xE007 C00C) bit description . . . . . . . . . . . . 431
Table 387:UARTn Line Status Register (U0LSR - address
0xE007 C014, Read Only) bit description . . . 431
Table 388:UARTn Scratch Pad Register (U0SCR - address
0xE007 C01C) bit description . . . . . . . . . . . . 433
Table 389:UARTn Auto-baud Control Register (U0ACR -
0xE007 C020) bit description. . . . . . . . . . . . . 433
Table 390:IrDA Control Register for UART3 only (U3ICR -
address 0xE007 C024) bit description. . . . . . 436
Table 392:UARTn Fractional Divider Register (U0FDR -
U3FDR - 0xE007 C028) bit description . . . . . 437
Table 394:UARTn Transmit Enable Register (U0TER -
U3TER - 0xE007 C030) bit description . . . . . 441
Table 397:UART1 Receiver Buffer Register (U1RBR -
Only) bit description . . . . . . . . . . . . . . . . . . . 447
Table 398:UART1 Transmitter Holding Register (U1THR -
Only) bit description . . . . . . . . . . . . . . . . . . . . 447
Table 399:UART1 Divisor Latch LSB Register (U1DLL -
U3RBR - 0E007 C000 when DLAB = 0, Read
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 448
Table 400:UART1 Divisor Latch MSB Register (U1DLM -
address 0xE001 0004 when DLAB = 1) bit
Only) bit description . . . . . . . . . . . . . . . . . . . .426
Table 379:UART0 Transmit Holding Register (U0THR -
UM10237_2
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Chapter 36: LPC24XX Supplementary information
Table 401:UART1 Interrupt Enable Register (U1IER -
description . . . . . . . . . . . . . . . . . . . . . . . . . . .448
Table 402:UART1 Interrupt Identification Register (U1IIR -
449
Table 428.Receive Frame Status register (CAN1RFS -
0xE004 8020) bit description . . . . . . . . . . . . . 489
Table 429.Receive Identifier Register (CAN1RID - address
bit description. . . . . . . . . . . . . . . . . . . . . . . . . 490
Table 431.Receive Data register A (CAN1RDA - address
0xE004 8028) bit description . . . . . . . . . . . . . 490
Table 432.Receive Data register B (CAN1RDB - address
0xE004 802C) bit description. . . . . . . . . . . . . 491
Table 433.Transmit Frame Information Register
(CAN1TFI[1/2/3] - address 0xE004 40[30/40/50],
CAN2TFI[1/2/3] - 0xE004 80[30/40/50]) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 492
Table 434.Transfer Identifier Register (CAN1TID[1/2/3] -
address 0xE004 80[34/44/54]) bit description 493
Table 436.Transmit Data Register A (CAN1TDA[1/2/3] -
address 0xE004 80[38/48/58]) bit description 493
Table 437.Transmit Data Register B (CAN1TDB[1/2/3] -
address 0xE004 40[3C/4C/5C], CAN2TDB[1/2/3]
- address 0xE004 80[3C/4C/5C]) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Table 438.Central Transit Status Register (CANTxSR -
address 0xE004 0000) bit description . . . . . . 495
Table 439.Central Receive Status Register (CANRxSR -
address 0xE004 0004) bit description . . . . . . 496
Table 440.Central Miscellaneous Status Register (CANMSR
- address 0xE004 0008) bit description . . . . . 496
Table 443.Acceptance Filter Mode Register (AFMR -
address 0xE003 C000) bit description. . . . . . 501
Table 444.Standard Frame Individual Start Address Register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 502
Table 445.Standard Frame Group Start Address Register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 502
Table 446.Extended Frame Start Address Register (EFF_sa
- address 0xE003 C00C) bit description . . . . 503
Table 447.Extended Frame Group Start Address Register
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
Table 448.End of AF Tables Register (ENDofTable - address
0xE003 C014) bit description. . . . . . . . . . . . . 504
Table 449.LUT Error Address Register (LUTerrAd - address
0xE003 C018) bit description. . . . . . . . . . . . . 504
Table 450.LUT Error Register (LUTerr - address
0xE003 C01C) bit description . . . . . . . . . . . . 505
Table 404:UART1 FIFO Control Register (U1FCR - address
0xE001 0008, Write Only) bit description . . . .452
Table 405:UART1 Line Control Register (U1LCR - address
0xE001 000C) bit description . . . . . . . . . . . . .452
Table 406:UART1 Modem Control Register (U1MCR -
address 0xE001 0010) bit description . . . . . .453
Table 408:UART1 Line Status Register (U1LSR - address
0xE001 0014, Read Only) bit description. . . .456
Table 409:UART1 Modem Status Register (U1MSR -
address 0xE001 0018) bit description . . . . . .457
Table 410:UART1 Scratch Pad Register (U1SCR - address
0xE001 0014) bit description . . . . . . . . . . . . .458
Table 411:Auto-baud Control Register (U1ACR - address
0xE001 0020) bit description . . . . . . . . . . . . .458
Table 412:UART1 Fractional Divider Register (U1FDR -
address 0xE001 0028) bit description . . . . . .462
Table 414:UART1 Transmit Enable Register (U1TER -
address 0xE001 0030) bit description . . . . . .465
Table 417.Summary of CAN acceptance filter and central
CAN registers . . . . . . . . . . . . . . . . . . . . . . . . .473
Table 418.Summary of CAN1 and CAN2 controller
registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .473
Table 419.Access to CAN1 and CAN2 controller
registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .474
Table 420. Mode register (CAN1MOD - address
0xE004 8000) bit description . . . . . . . . . . . . .475
Table 421.Command Register (CAN1CMR - address
0xE004 8004) bit description . . . . . . . . . . . . .477
Table 422. Global Status Register (CAN1GSR - address
0xE004 8008) bit description . . . . . . . . . . . . .478
Table 423.Interrupt and Capture Register (CAN1ICR -
0xE004 800C) bit description . . . . . . . . . . . . .481
Table 424.Interrupt Enable Register (CAN1IER - address
bit description . . . . . . . . . . . . . . . . . . . . . . . . .485
Table 425. Bus Timing Register (CAN1BTR - address
bit description . . . . . . . . . . . . . . . . . . . . . . . . .486
Table 426.Error Warning Limit register (CAN1EWL - address
0xE004 8018) bit description . . . . . . . . . . . . .487
Table 427. Status Register (CAN1SR - address
UM10237_2
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Chapter 36: LPC24XX Supplementary information
Table 452.FullCAN Interrupt and Capture register 0
Table 480:SSPn DMA Control Register (SSP0DMACR -
description . . . . . . . . . . . . . . . . . . . . . . . . . . .505
Table 453.FullCAN Interrupt and Capture register 1
0xE003 0024) bit description . . . . . . . . . . . . . 550
Table 491:Power Control register (MCIPower - address
0xE008 C000) bit description. . . . . . . . . . . . . 564
Table 492:Clock Control register (MCIClock - address
0xE008 C004) bit description. . . . . . . . . . . . . 565
Table 493:Argument register (MCIArgument - address
0xE008 C008) bit description. . . . . . . . . . . . . 565
Table 494:Command register (MCICommand - address
0xE008 C00C) bit description . . . . . . . . . . . . 566
Table 496:Command Response register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .505
Table 456.Example of Acceptance Filter Tables and ID index
Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .519
Table 462:SPI Control Register (S0SPCR - address
0xE002 0000) bit description . . . . . . . . . . . . .531
Table 463:SPI Status Register (S0SPSR - address
0xE002 0004) bit description . . . . . . . . . . . . .532
Table 464:SPI Data Register (S0SPDR - address
0xE002 0008) bit description . . . . . . . . . . . . .533
Table 465:SPI Clock Counter Register (S0SPCCR - address
0xE002 000C) bit description . . . . . . . . . . . . .533
Table 466:SPI Test Control Register (SPTCR - address
0xE002 0010) bit description . . . . . . . . . . . . .534
Table 467:SPI Test Status Register (SPTSR - address
0xE002 0014) bit description . . . . . . . . . . . . .534
Table 468:SPI Interrupt Register (S0SPINT - address
0xE002 001C) bit description . . . . . . . . . . . . .534
Table 471:SSPn Control Register 0 (SSP0CR0 - address
description . . . . . . . . . . . . . . . . . . . . . . . . . . .546
Table 472:SSPn Control Register 1 (SSP0CR1 - address
description . . . . . . . . . . . . . . . . . . . . . . . . . . .547
Table 473:SSPn Data Register (SSP0DR - address
description . . . . . . . . . . . . . . . . . . . . . . . . . . .547
Table 474:SSPn Status Register (SSP0SR - address
description . . . . . . . . . . . . . . . . . . . . . . . . . . .548
Table 475:SSPn Clock Prescale Register (SSP0CPSR -
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 566
Table 497:Response registers (MCIResponse0-3 -
addresses 0xE008 0014, 0xE008 C018,
0xE008 001C and 0xE008 C020) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 567
Table 499:Data Timer register (MCIDataTimer - address
0xE008 C024) bit description. . . . . . . . . . . . . 567
Table 500:Data Length register (MCIDataLength - address
0xE008 C028) bit description. . . . . . . . . . . . . 567
Table 501:Data Control register (MCIDataCtrl - address
0xE008 C02C) bit description . . . . . . . . . . . . 568
Table 503:Data Counter register (MCIDataCnt - address
0xE008 C030) bit description. . . . . . . . . . . . . 569
Table 504:Status register (MCIStatus - address
0xE008 C034) bit description. . . . . . . . . . . . . 569
Table 505:Clear register (MCIClear - address 0xE008 C038)
bit description. . . . . . . . . . . . . . . . . . . . . . . . . 570
Table 506:Interrupt Mask registers (MCIMask0 - address
0xE008 C03C) bit description . . . . . . . . . . . . 570
Table 507:FIFO Counter register (MCIFifoCnt - address
0xE008 C048) bit description. . . . . . . . . . . . . 571
Table 508:Data FIFO register (MCIFIFO - address
0xE003 8010) bit description . . . . . . . . . . . . .548
Table 476:SSPn Interrupt Mask Set/Clear register
- 0xE003 0014) bit description . . . . . . . . . . . .549
Table 477:SSPn Raw Interrupt Status register (SSP0RIS -
bit description . . . . . . . . . . . . . . . . . . . . . . . . .549
Table 478:SSPn Masked Interrupt Status register (SSPnMIS
0xE003 001C) bit description . . . . . . . . . . . . .550
Table 479:SSPn interrupt Clear Register (SSP0ICR -
bit description . . . . . . . . . . . . . . . . . . . . . . . . .550
description . . . . . . . . . . . . . . . . . . . . . . . . . . . 571
Table 510.I2CnCONSET used to configure Master
mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 574
addresses: 0xE001 C000, 0xE005 C000,
0xE008 0000) bit description . . . . . . . . . . . . . 582
UM10237_2
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Chapter 36: LPC24XX Supplementary information
addresses 0xE001 C018, 0xE005 C018,
0xE008 0018) bit description . . . . . . . . . . . . .584
0xE001 C004, 0xE005 C004, 0xE008 0004) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . .584
0xE001 C008, 0xE005 C008, 0xE008 0008) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . .585
addresses 0xE001 C00C, 0xE005 C00C,
Table 547:Interrupt Register (T[0/1/2/3]IR - addresses
0xE007 4000) bit description . . . . . . . . . . . . . 624
Table 548:Timer Control Register (TCR, TIMERn: TnTCR -
0xE007 0004, 0xE007 4004) bit description . 625
Table 549:Count Control Register (T[0/1/2/3]CTCR -
0xE007 0070, 0xE007 4070) bit description . 625
Table 550:Match Control Register (T[0/1/2/3]MCR -
0xE007 0014, 0xE007 4014) bit description . 627
Table 551:Capture Control Register (T[0/1/2/3]CCR -
0xE007 0028, 0xE007 4028) bit description . 628
Table 552:External Match Register (T[0/1/2/3]EMR -
0xE008 000C) bit description . . . . . . . . . . . . .585
(I2C[0/1/2]SCLH - addresses 0xE001 C010,
0xE005 C010, 0xE008 0010) bit description .585
- addresses 0xE001 C014, 0xE005 C014,
0xE008 0014) bit description . . . . . . . . . . . . .585
operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . .586
Table 522.I2CONSET used to initialize Master Transmitter
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .587
Table 523.I2C0ADR and I2C1ADR usage in Slave Receiver
mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .588
Table 524.I2C0CONSET and I2C1CONSET used to initialize
Slave Receiver mode . . . . . . . . . . . . . . . . . . .588
Table 532:Digital Audio Output register (I2SDAO - address
0xE008 8000) bit description . . . . . . . . . . . . .614
Table 533:Digital Audio Input register (I2SDAI - address
0xE008 8004) bit description . . . . . . . . . . . . .615
Table 534:Transmit FIFO register (I2STXFIFO - address
0xE008 8008) bit description . . . . . . . . . . . . .615
Table 535:Receive FIFO register (I2RXFIFO - address
0xE008 800C) bit description . . . . . . . . . . . . .615
Table 536:Status Feedback register (I2SSTATE - address
0xE008 8010) bit description . . . . . . . . . . . . .615
Table 537:DMA Configuration register 1 (I2SDMA1 - address
0xE008 8014) bit description . . . . . . . . . . . . .616
Table 538:DMA Configuration register 2 (I2SDMA2 - address
0xE008 8018) bit description . . . . . . . . . . . . .616
Table 539:Interrupt Request Control register (I2SIRQ -
address 0xE008 801C) bit description . . . . . .617
Table 540:Transmit Clock Rate register (I2TXRATE -
address 0xE008 8020) bit description . . . . . .617
Table 541:Receive Clock Rate register (I2SRXRATE -
address 0xE008 8024) bit description . . . . . .617
0xE007 003C, 0xE007 403C) bit description. 629
Table 558:PWM Interrupt Register (PWM0IR - address
0xE001 8000) bit description . . . . . . . . . . . . . 639
Table 559:PWM Timer Control Register (PWM0TCR -
0xE001 8004) bit description . . . . . . . . . . . . . 640
Table 560:PWM Count control Register (PWM0TCR -
0xE001 8004) bit description . . . . . . . . . . . . . 641
Table 561:Match Control Register (PWM0MCR - address
0xE000 8014) bit description . . . . . . . . . . . . . 641
Table 562:PWM Capture Control Register (PWM0CCR -
0xE001 8028) bit description . . . . . . . . . . . . . 643
Table 563:PWM Control Registers (PWMPCR - address
0xE001 804C) bit description. . . . . . . . . . . . . 644
Table 564:PWM Latch Enable Register (PWM0LER -
0xE001 8050) bit description . . . . . . . . . . . . . 645
Table 568.Interrupt Location Register (ILR - address
0xE002 4000) bit description . . . . . . . . . . . . . 651
Table 569.Clock Tick Counter Register (CTCR - address
0xE002 4004) bit description . . . . . . . . . . . . . 651
Table 570.Clock Control Register (CCR - address
0xE002 4008) bit description . . . . . . . . . . . . . 651
Table 571.Counter Increment Interrupt Register (CIIR -
address 0xE002 400C) bit description. . . . . . 652
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Chapter 36: LPC24XX Supplementary information
Table 573.Alarm Mask Register (AMR - address
Table 611.ISP Prepare sector(s) for write operation
command . . . . . . . . . . . . . . . . . . . . . . . . . . . . 686
Table 618.ISP Read Boot Code version number
0xE002 4010) bit description . . . . . . . . . . . . .653
Table 574.Consolidated Time register 0 (CTIME0 - address
0xE002 4014) bit description . . . . . . . . . . . . .654
Table 575.Consolidated Time register 1 (CTIME1 - address
0xE002 4018) bit description . . . . . . . . . . . . .654
Table 576.Consolidated Time register 2 (CTIME2 - address
0xE002 401C) bit description . . . . . . . . . . . . .655
Table 581:Prescaler Integer register (PREINT - address
0xE002 4080) bit description . . . . . . . . . . . . .658
Table 582:Prescaler Integer register (PREFRAC - address
0xE002 4084) bit description . . . . . . . . . . . . .658
Table 583.Prescaler cases where the Integer Counter reload
value is incremented. . . . . . . . . . . . . . . . . . . .660
Table 587:Watchdog Mode register (WDMOD - address
0xE000 0000) bit description . . . . . . . . . . . . .664
Table 588:Watchdog Constant register (WDTC - address
0xE000 0004) bit description . . . . . . . . . . . . .664
Table 589:Watchdog Feed Register (WDFEED - address
0xE000 0008) bit description . . . . . . . . . . . . .665
Table 590:Watchdog Timer Value register (WDTV - address
0xE000 000C) bit description . . . . . . . . . . . . .665
Table 591:Watchdog Timer Clock Source Selection register
command . . . . . . . . . . . . . . . . . . . . . . . . . . . . 689
Table 622.IAP Prepare sector(s) for write operation
command . . . . . . . . . . . . . . . . . . . . . . . . . . . . 693
Table 627.IAP Read Boot Code version number command.
695
Table 634.Correlation between possible ISP baudrates and
CCLK frequency (in MHz) . . . . . . . . . . . . . . . 702
description . . . . . . . . . . . . . . . . . . . . . . . . . . .665
Table 594:A/D Control Register (AD0CR - address
0xE003 4000) bit description . . . . . . . . . . . . .669
Table 595:A/D Global Data Register (AD0GDR - address
0xE003 4004) bit description . . . . . . . . . . . . .671
Table 596:A/D Status Register (AD0STAT - address
0xE003 4030) bit description . . . . . . . . . . . . .671
Table 597:A/D Interrupt Enable Register (AD0INTEN -
address 0xE003 400C) bit description . . . . . .672
Table 598:A/D Data Registers (AD0DR0 to AD0DR7 -
Table 641.ISP Read Boot Code version number
command . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704
Table 646.IAP Read Boot Code version number
description . . . . . . . . . . . . . . . . . . . . . . . . . . .672
Table 600:D/A Converter Register (DACR - address
0xE006 C000) bit description . . . . . . . . . . . . .675
Table 603.Code Read Protection hardware/software
interaction. . . . . . . . . . . . . . . . . . . . . . . . . . . .683
Table 607.Correlation between possible ISP baudrates and
CCLK frequency (in MHz). . . . . . . . . . . . . . . .684
command . . . . . . . . . . . . . . . . . . . . . . . . . . . . 708
Table 654.Interrupt Status register (DMACIntStatus -
address 0xFFE0 4000) bit description . . . . . . 722
Table 655.Interrupt Terminal Count Status register
(DMACIntTCStatus - address 0xFFE0 4004) bit
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Table 656.Interrupt Terminal Count Clear register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .722
Table 657.Interrupt Error Status register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .723
Table 658.Interrupt Error Clear register (DMACIntErrClr -
address 0xFFE0 4010) bit description . . . . . .723
Table 659.Raw Interrupt Terminal Count Status register
bit description . . . . . . . . . . . . . . . . . . . . . . . . .723
Table 660.Raw Error Interrupt Status register
0xFFE0 4018) bit description . . . . . . . . . . . . .724
Table 661.Enabled Channel register (DMACEnbldChns -
address 0xFFE0 401C) bit description . . . . . .724
Table 662.Software Burst Request register (DMACSoftBReq
- address 0xFFE0 4020) bit description . . . . .724
Table 663.Software Single Request register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .725
Table 664.Software Last Burst Request register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .725
Table 665.Software Last Single Request register
description . . . . . . . . . . . . . . . . . . . . . . . . . . .726
Table 666.Configuration register (DMACConfiguration -
address 0xFFE0 4030) bit description . . . . . .726
Table 667.Synchronization register (DMACSync - address
0xFFE0 4034) bit description . . . . . . . . . . . . .726
Table 668.Channel Source Address registers
(DMACC0SrcAddr - address 0xFFE0 4100 and
DMACC1SrcAddr - address 0xFFE0 4120) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . .727
Table 669.Channel Destination Address registers
(DMACC0DestAddr - address 0xFFE0 4104 and
DMACC1DestAddr - address 0xFFE0 4124) bit
description . . . . . . . . . . . . . . . . . . . . . . . . . . .728
Table 670.Channel Linked List Item registers (DMACC0LLI -
0xFFE0 4128) bit description . . . . . . . . . . . . .728
Table 671.Channel Control registers (DMACC0Control -
address 0xFFE0 412C) bit description . . . . . .729
Table 675.Channel Configuration registers
(DMACC0Configuration - address 0xFFE0 4110
and DMACC1Configuration - address
0xFFE0 4130) bit description . . . . . . . . . . . . .731
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Chapter 36: LPC24XX Supplementary information
4. Figures
Fig 9. Map of lower memory is showing re-mapped and
re-mappable areas for a LPC2400 part with flash26
Fig 13. Oscillator modes and models: a) slave mode of
operation, b) oscillation mode of operation, c)
Fig 53. USB OTG port configuration: port U1 OTG
Dual-Role device, port U2 host . . . . . . . . . . . . . 396
Fig 55. USB OTG port configuration: port U2 host, port U1
host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 398
Fig 56. USB OTG port configuration: port U1 host, port U2
device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399
Fig 57. Port selection for PORT_FUNC bit 0 = 0 and
PORT_FUNC bit 1 = 0. . . . . . . . . . . . . . . . . . . . 403
Fig 60. Hardware support for B-device switching from
peripheral state to host state . . . . . . . . . . . . . . 412
Fig 61. State transitions implemented in software during
B-device switching from peripheral to host . . . . 413
Fig 62. Hardware support for A-device switching from host
state to peripheral state. . . . . . . . . . . . . . . . . . . 415
Fig 63. State transitions implemented in software during
A-device switching from host to peripheral . . . . 416
Fig 74. Transmit buffer layout for standard and extended
frame format configurations . . . . . . . . . . . . . . . 470
Fig 75. Receive buffer layout for standard and extended
frame format configurations . . . . . . . . . . . . . . . 471
Fig 76. Global Self-Test (high-speed CAN
Bus example) . . . . . . . . . . . . . . . . . . . . . . . . . . 472
Fig 78. Entry in FullCAN and individual standard identifier
tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499
Fig 81. ID Look-up table example explaining the search
algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
Fig 82. Semaphore procedure for reading an auto-stored
message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510
Fig 83. FullCAN section example of the ID look-up
table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512
/
Fig 14. PLL block diagram (N = 16, M = 125, USBSEL = 6,
CCLKSEL = 4) . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Fig 16. 32 bit bank external memory interfaces ( bits
MW = 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Fig 17. 16 bit bank external memory interfaces (bits
MW = 01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Fig 18. 8 bit bank external memory interface
(bits MW = 00) . . . . . . . . . . . . . . . . . . . . . . . . . . .98
Fig 20. Simplified block diagram of the Memory Accelerator
Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
Fig 21. Block diagram of the Memory Accelerator Module .
106
Fig 22. Block diagram of the Vectored Interrupt Controller .
118
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Chapter 36: LPC24XX Supplementary information
Fig 88. Message overwritten indicated by semaphore bits
and message lost. . . . . . . . . . . . . . . . . . . . . . . .516
Fig 91. Detailed example of acceptance filter tables and ID
index values. . . . . . . . . . . . . . . . . . . . . . . . . . . .520
Fig 92. ID Look-up table configuration example (no
FullCAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .522
Fig 93. ID Look-up table configuration example (FullCAN
activated and enabled) . . . . . . . . . . . . . . . . . . .524
Fig 94. SPI data transfer format (CPHA = 0 and
Fig 130. A timer Cycle in Which PR=2, MRx=6, and both
interrupt and stop on match are enabled . . . . . 630
Fig 141. Map of lower memory after reset for flashless
LPC2400 parts . . . . . . . . . . . . . . . . . . . . . . . . . 698
CPHA = 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .527
Fig 96. Texas Instruments Synchronous Serial Frame
Two Frames Transfer. . . . . . . . . . . . . . . . . . . . .538
Fig 97. SPI frame format with CPOL=0 and CPHA=0 (a)
Single and b) Continuous Transfer). . . . . . . . . .539
Fig 99. SPI frame format with CPOL = 1 and CPHA = 0 (a)
Single and b) Continuous Transfer). . . . . . . . . .541
Fig 100. SPI Frame Format with CPOL = 1 and
Fig 147. EmbeddedICE debug environment block
diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 743
CPHA = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .542
Fig 114. A master receiver switch to master Transmitter after
sending repeated START. . . . . . . . . . . . . . . . . .576
Fig 120. Format and States in the Master Transmitter
mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .590
Fig 121. Format and States in the Master Receiver
mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .591
Fig 123. Format and States in the Slave Transmitter
mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .593
Fig 124. Simultaneous repeated START conditions from 2
masters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601
Fig 126. Recovering from a bus obstruction caused by a low
level on SDA . . . . . . . . . . . . . . . . . . . . . . . . . . .602
Fig 129. A timer cycle in which PR=2, MRx=6, and both
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Chapter 36: LPC24XX Supplementary information
5. Contents
7
On-chip flash programming memory
(LPC2458/68/78). . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1
Memory Mapping Control Register (MEMMAP -
0xE01F C040) . . . . . . . . . . . . . . . . . . . . . . . . 25
3.2.1
Reset Source Identification Register (RSIR -
0xE01F C180) . . . . . . . . . . . . . . . . . . . . . . . . 34
System Controls and Status register (SCS -
0xE01F C1A0) . . . . . . . . . . . . . . . . . . . . . . . . 35
AHB Arbiter Configuration register 1 (AHBCFG1
- 0xE01F C188) . . . . . . . . . . . . . . . . . . . . . . . 36
AHB Arbiter Configuration register 2 (AHBCFG2 -
0xE01F C18C) . . . . . . . . . . . . . . . . . . . . . . . . 38
3.3.1
3.1.2
External Interrupt flag register (EXTINT -
0xE01F C140) . . . . . . . . . . . . . . . . . . . . . . . . 29
External Interrupt Mode register (EXTMODE -
0xE01F C148) . . . . . . . . . . . . . . . . . . . . . . . . 31
External Interrupt Polarity register (EXTPOLAR -
0xE01F C14C) . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.1
3.1.3
3.1.4
3.4.2
1
Summary of clocking and power control
functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.4
PLL Control register (PLLCON - 0xE01F C080) .
48
3.2.5
3.2.6
PLL Configuration register (PLLCFG -
0xE01F C084) . . . . . . . . . . . . . . . . . . . . . . . . 49
PLL Status register (PLLSTAT - 0xE01F C088). .
51
Clock Source Select register (CLKSRCSEL -
0xE01F C10C) . . . . . . . . . . . . . . . . . . . . . . . . 46
3.1.1
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3.3.1
3.4.6
Power Mode Control register (PCON -
0xE01F C0C0) . . . . . . . . . . . . . . . . . . . . . . . . 61
Interrupt Wakeup Register (INTWAKE -
0xE01F C144) . . . . . . . . . . . . . . . . . . . . . . . . 62
Power Control for Peripherals register (PCONP -
0xE01F C0C4) . . . . . . . . . . . . . . . . . . . . . . . . 63
CPU Clock Configuration register (CCLKCFG -
0xE01F C104) . . . . . . . . . . . . . . . . . . . . . . . . 57
USB Clock Configuration register (USBCLKCFG -
0xE01F C108) . . . . . . . . . . . . . . . . . . . . . . . . 57
Peripheral Clock Selection registers 0 and 1
0xE01F C1AC) . . . . . . . . . . . . . . . . . . . . . . . . 58
3.3.2
3.4.7
3.4.8
3.3.4
10.10
10.11
Dynamic Memory Last Data Out to Active Time
register (EMCDynamictAPR - 0xFFE0 803C) 83
Dynamic Memory Data-in to Active Command
83
Dynamic Memory Write Recovery Time register
(EMCDynamictWR - 0xFFE0 8044). . . . . . . . 84
Dynamic Memory Active to Active Command
0xFFE0 8048) . . . . . . . . . . . . . . . . . . . . . . . . 84
Dynamic Memory Auto-refresh Period register
(EMCDynamictRFC - 0xFFE0 804C). . . . . . . 85
Dynamic Memory Exit Self-refresh register
(EMCDynamictXSR - 0xFFE0 8050) . . . . . . . 85
Dynamic Memory Active Bank A to Active Bank B
10.12
10.13
10.14
10.15
10.16
0xFFE0 8054) . . . . . . . . . . . . . . . . . . . . . . . . 86
Dynamic Memory Load Mode register to Active
10.17
0xFFE0 8058) . . . . . . . . . . . . . . . . . . . . . . . . 86
Static Memory Extended Wait register
(EMCStaticExtendedWait - 0xFFE0 8080). . . 87
Dynamic Memory Configuration registers
10.18
10.19
10.1
EMC Control register (EMCControl -
0xFFE0 8000). . . . . . . . . . . . . . . . . . . . . . . . . 76
EMC Status register (EMCStatus - 0xFFE0 8004)
77
EMC Configuration register (EMCConfig -
0xFFE0 8008). . . . . . . . . . . . . . . . . . . . . . . . . 78
Dynamic Memory Control register
(EMCDynamicControl - 0xFFE0 8020). . . . . . 78
Dynamic Memory Refresh Timer register
(EMCDynamicRefresh - 0xFFE0 8024) . . . . . 80
Dynamic Memory Read Configuration register
(EMCDynamicReadConfig - 0xFFE0 8028) . . 81
Dynamic Memory Percentage Command Period
register (EMCDynamictRP - 0xFFE0 8030) . . 81
Dynamic Memory Active to Precharge Command
140, 160) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Dynamic Memory RAS & CAS Delay registers
144, 164) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Static Memory Configuration registers
260) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Static Memory Write Enable Delay registers
,264). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Static Memory Output Enable Delay registers
268) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Static Memory Read Delay registers
10.20
10.21
10.22
10.23
10.24
10.25
10.2
10.3
10.4
10.5
10.6
10.7
10.8
26C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Static Memory Page Mode Read Delay registers
(EMCStaticwaitPage0-3 - 0xFFE0 8210, 230,
0xFFE0 8034). . . . . . . . . . . . . . . . . . . . . . . . . 82
Dynamic Memory Self-refresh Exit Time register
(EMCDynamictSREX - 0xFFE0 8038) . . . . . . 82
10.9
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10.26
10.27
Static Memory Write Delay registers
274) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Static Memory Turn Round Delay registers
278) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
5
Memory Accelerator Module operating modes .
102
7.1
MAM Control Register (MAMCR - 0xE01F C000)
104
MAM Timing Register (MAMTIM - 0xE01F C004)
104
7.2
3.7
IRQ Status Register (VICIRQStatus -
0xFFFF F000) . . . . . . . . . . . . . . . . . . . . . . . . 113
FIQ Status Register (VICFIQStatus -
0xFFFF F004) . . . . . . . . . . . . . . . . . . . . . . . . 113
Vector Address Registers 0-31 (VICVectAddr0-31
- 0xFFFF F100 to 17C) . . . . . . . . . . . . . . . . . 113
Vector Priority Registers 0-31
(VICVectPriority0-31 - 0xFFFF F200 to 27C). 114
Vector Address Register (VICAddress -
0xFFFF FF00) . . . . . . . . . . . . . . . . . . . . . . . . 114
Software Priority Mask Register
(VICSWPriorityMask - 0xFFFF F024) . . . . . . 114
Protection Enable Register (VICProtection -
0xFFFF F020) . . . . . . . . . . . . . . . . . . . . . . . . 115
3.8
3.1
Software Interrupt Register (VICSoftInt -
0xFFFF F018). . . . . . . . . . . . . . . . . . . . . . . . 111
Software Interrupt Clear Register
(VICSoftIntClear - 0xFFFF F01C). . . . . . . . . 111
Raw Interrupt Status Register (VICRawIntr -
0xFFFF F008). . . . . . . . . . . . . . . . . . . . . . . . 111
Interrupt Enable Register (VICIntEnable -
0xFFFF F010). . . . . . . . . . . . . . . . . . . . . . . . 112
Interrupt Enable Clear Register (VICIntEnClear -
0xFFFF F014). . . . . . . . . . . . . . . . . . . . . . . . 112
Interrupt Select Register (VICIntSelect -
3.9
3.2
3.3
3.4
3.5
3.6
3.10
3.11
3.12
3.13
0xFFFF F00C) . . . . . . . . . . . . . . . . . . . . . . . 112
5.3
5.4
5.5
5.6
5.7
Pin Function Select register 2 (PINSEL2 -
0xE002 C008) . . . . . . . . . . . . . . . . . . . . . . . 180
Pin Function Select Register 3 (PINSEL3 -
0xE002 C00C) . . . . . . . . . . . . . . . . . . . . . . . 180
Pin Function Select Register 4 (PINSEL4 -
0xE002 C010) . . . . . . . . . . . . . . . . . . . . . . . 181
Pin Function Select Register 5 (PINSEL5 -
0xE002 C014) . . . . . . . . . . . . . . . . . . . . . . . 183
Pin Function Select Register 6 (PINSEL6 -
0xE002 C018) . . . . . . . . . . . . . . . . . . . . . . . 185
Pin Function Select register 0 (PINSEL0 -
0xE002 C000). . . . . . . . . . . . . . . . . . . . . . . . 178
Pin Function Select Register 1 (PINSEL1 -
5.1
5.2
0xE002 C004). . . . . . . . . . . . . . . . . . . . . . . . 179
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5.9
Pin Function Select Register 8 (PINSEL8 -
5.16
5.17
5.18
5.19
5.20
5.21
5.22
Pin Mode select register 3 (PINMODE3 -
0xE002 C04C) . . . . . . . . . . . . . . . . . . . . . . . 190
Pin Mode select register 4 (PINMODE4 -
0xE002 C050) . . . . . . . . . . . . . . . . . . . . . . . 190
Pin Mode select register 5 (PINMODE5 -
0xE002 C054) . . . . . . . . . . . . . . . . . . . . . . . 191
Pin Mode select register 6 (PINMODE6 -
0xE002 C058) . . . . . . . . . . . . . . . . . . . . . . . 191
Pin Mode select register 7 (PINMODE7 -
0xE002 C05C) . . . . . . . . . . . . . . . . . . . . . . . 191
Pin Mode select register 8 (PINMODE8 -
0xE002 C060) . . . . . . . . . . . . . . . . . . . . . . . 191
Pin Mode select register 9 (PINMODE9 -
0xE002 C020). . . . . . . . . . . . . . . . . . . . . . . . 186
Pin Function Select Register 9 (PINSEL9 -
0xE002 C024). . . . . . . . . . . . . . . . . . . . . . . . 187
Pin Function Select Register 10 (PINSEL10 -
0xE002 C028). . . . . . . . . . . . . . . . . . . . . . . . 188
Pin Function Select Register 11 (PINSEL11 -
0xE002 C02C) . . . . . . . . . . . . . . . . . . . . . . . 189
Pin Mode select register 0 (PINMODE0 -
0xE002 C040). . . . . . . . . . . . . . . . . . . . . . . . 189
Pin Mode select register 1 (PINMODE1 -
0xE002 C044). . . . . . . . . . . . . . . . . . . . . . . . 190
Pin Mode select register 2 (PINMODE2 -
5.10
5.11
5.12
5.13
5.14
5.15
0xE002 C048). . . . . . . . . . . . . . . . . . . . . . . . 190
0xE002 C064) . . . . . . . . . . . . . . . . . . . . . . . 192
6.6.1
6.6.2
GPIO overall Interrupt Status register (IOIntStatus
- 0xE002 8080) . . . . . . . . . . . . . . . . . . . . . . 206
GPIO Interrupt Enable for Rising edge register
0xE002 80B0) . . . . . . . . . . . . . . . . . . . . . . . 206
GPIO Interrupt Enable for Falling edge register
0xE002 80B4) . . . . . . . . . . . . . . . . . . . . . . . 206
GPIO Interrupt Status for Rising edge register
0xE002 80A4) . . . . . . . . . . . . . . . . . . . . . . . 207
GPIO Interrupt Status for Falling edge register
0xE002 80A8) . . . . . . . . . . . . . . . . . . . . . . . 207
GPIO Interrupt Clear register (IO0IntClr -
6.6.3
6.6.4
6.6.5
6.6.6
6.1
GPIO port Direction register IODIR and
FIO[0/1/2/3/4]DIR - 0x3FFF C0[0/2/4/6/8]0). 198
GPIO port output Set register IOSET and
FIO[0/1/2/3/4]SET - 0x3FFF C0[1/3/5/7/9]8) 199
GPIO port output Clear register IOCLR and
FIO[0/1/2/3/4]CLR - 0x3FFF C0[1/3/5/7/9]C) 201
GPIO port Pin value register IOPIN and FIOPIN
FIO[0/1/2/3/4]PIN - 0x3FFF C0[1/3/5/7/9]4) . 202
Fast GPIO port Mask register
0x3FFF C0[1/3/5/7/9]0) . . . . . . . . . . . . . . . . 204
6.2
6.3
6.4
6.5
0xE002 808C and IO2IntClr - 0xE002 80AC) 207
7.1
Example 1: sequential accesses to IOSET and
IOCLR affecting the same GPIO pin/bit. . . . 208
Example 2: an instantaneous output of 0s and 1s
on a GPIO port. . . . . . . . . . . . . . . . . . . . . . . 208
Output signal frequency considerations when
209
7.2
7.4
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5
7.1.6
MAC Configuration Register 1 (MAC1 -
0xFFE0 0000) . . . . . . . . . . . . . . . . . . . . . . . 220
MAC Configuration Register 2 (MAC2 -
0xFFE0 0004) . . . . . . . . . . . . . . . . . . . . . . . 220
Back-to-Back Inter-Packet-Gap Register (IPGT -
0xFFE0 0008) . . . . . . . . . . . . . . . . . . . . . . . 222
Non Back-to-Back Inter-Packet-Gap Register
(IPGR - 0xFFE0 000C) . . . . . . . . . . . . . . . . 222
Collision Window / Retry Register (CLRT -
0xFFE0 0010) . . . . . . . . . . . . . . . . . . . . . . . 222
Maximum Frame Register (MAXF - 0xFFE0 0014)
223
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Chapter 36: LPC24XX Supplementary information
7.1.9
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
Receive Filter Control Register (RxFilterCtrl -
0xFFE0 0200) . . . . . . . . . . . . . . . . . . . . . . . 235
Receive Filter WoL Status Register
(RxFilterWoLStatus - 0xFFE0 0204) . . . . . . 236
Receive Filter WoL Clear Register
(RxFilterWoLClear - 0xFFE0 0208) . . . . . . . 236
Hash Filter Table LSBs Register (HashFilterL -
0xFFE0 0210) . . . . . . . . . . . . . . . . . . . . . . . 237
Hash Filter Table MSBs Register (HashFilterH -
0xFFE0 0214) . . . . . . . . . . . . . . . . . . . . . . . 237
Interrupt Status Register (IntStatus -
0xFFE0 0FE0) . . . . . . . . . . . . . . . . . . . . . . . 237
Interrupt Enable Register (IntEnable -
0xFFE0 0FE4) . . . . . . . . . . . . . . . . . . . . . . . 238
Interrupt Clear Register (IntClear -
0xFFE0 0FE8) . . . . . . . . . . . . . . . . . . . . . . . 239
Interrupt Set Register (IntSet -
0xFFE0 0FEC). . . . . . . . . . . . . . . . . . . . . . . 239
Power Down Register (PowerDown -
MII Mgmt Configuration Register (MCFG -
0xFFE0 0020). . . . . . . . . . . . . . . . . . . . . . . . 224
MII Mgmt Command Register (MCMD -
0xFFE0 0024). . . . . . . . . . . . . . . . . . . . . . . . 224
MII Mgmt Address Register (MADR -
0xFFE0 0028). . . . . . . . . . . . . . . . . . . . . . . . 225
MII Mgmt Write Data Register (MWTD -
0xFFE0 002C) . . . . . . . . . . . . . . . . . . . . . . . 225
MII Mgmt Read Data Register (MRDD -
0xFFE0 0030). . . . . . . . . . . . . . . . . . . . . . . . 225
MII Mgmt Indicators Register (MIND -
0xFFE0 0034). . . . . . . . . . . . . . . . . . . . . . . . 225
Station Address 0 Register (SA0 -
0xFFE0 0040). . . . . . . . . . . . . . . . . . . . . . . . 226
Station Address 1 Register (SA1 -
0xFFE0 0044). . . . . . . . . . . . . . . . . . . . . . . . 226
Station Address 2 Register (SA2 -
7.1.10
7.1.11
7.1.12
7.1.13
7.1.14
7.1.15
7.1.16
7.1.17
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
0xFFE0 0048). . . . . . . . . . . . . . . . . . . . . . . . 227
Command Register (Command -
7.2.1
0xFFE0 0FF4) . . . . . . . . . . . . . . . . . . . . . . . 240
0xFFE0 0100). . . . . . . . . . . . . . . . . . . . . . . . 227
Receive Descriptor Base Address Register
(RxDescriptor - 0xFFE0 0108) . . . . . . . . . . . 228
Receive Status Base Address Register (RxStatus
- 0xFFE0 010C) . . . . . . . . . . . . . . . . . . . . . . 229
Receive Number of Descriptors Register
(RxDescriptor - 0xFFE0 0110) . . . . . . . . . . . 229
Receive Produce Index Register
7.2.3
7.2.4
7.2.5
7.2.6
(RxProduceIndex - 0xFFE0 0114) . . . . . . . . 229
Receive Consume Index Register
7.2.7
(RxConsumeIndex - 0xFFE0 0118) . . . . . . . 230
Transmit Descriptor Base Address Register
(TxDescriptor - 0xFFE0 011C) . . . . . . . . . . . 230
Transmit Status Base Address Register (TxStatus
- 0xFFE0 0120). . . . . . . . . . . . . . . . . . . . . . . 230
Transmit Number of Descriptors Register
(TxDescriptorNumber - 0xFFE0 0124) . . . . . 231
Transmit Produce Index Register
7.2.8
7.2.9
7.2.10
7.2.11
7.2.12
7.2.13
7.2.14
7.2.15
7.2.16
7.2.17
(TxProduceIndex - 0xFFE0 0128) . . . . . . . . 231
Transmit Consume Index Register
(TxConsumeIndex - 0xFFE0 012C) . . . . . . . 232
Transmit Status Vector 0 Register (TSV0 -
0xFFE0 0158). . . . . . . . . . . . . . . . . . . . . . . . 232
Transmit Status Vector 1 Register (TSV1 -
0xFFE0 015C) . . . . . . . . . . . . . . . . . . . . . . . 233
Receive Status Vector Register (RSV -
0xFFE0 0160). . . . . . . . . . . . . . . . . . . . . . . . 233
Flow Control Counter Register
(FlowControlCounter - 0xFFE0 0170). . . . . . 234
Flow Control Status Register (FlowControlStatus -
0xFFE0 0174). . . . . . . . . . . . . . . . . . . . . . . . 235
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Chapter 36: LPC24XX Supplementary information
7.4
Clock and Signal Polarity register (LCD_POL, RW
- 0xFFE1 0008) . . . . . . . . . . . . . . . . . . . . . . 306
Line End Control register (LCD_LE, RW - 0xFFE1
000C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308
Upper Panel Frame Base Address register
7.5
7.6
(LCD_UPBASE, RW - 0xFFE1 0010) . . . . . 309
Lower Panel Frame Base Address register
7.7
(LCD_LPBASE, RW - 0xFFE1 0014). . . . . . 309
LCD Control register (LCD_CTRL, RW - 0xFFE1
0018) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
Interrupt Mask register (LCD_INTMSK, RW -
0xFFE1 001C) . . . . . . . . . . . . . . . . . . . . . . . 312
Raw Interrupt Status register (LCD_INTRAW, RW
- 0xFFE1 0020) . . . . . . . . . . . . . . . . . . . . . . 313
Masked Interrupt Status register (LCD_INTSTAT,
RW - 0xFFE1 0024). . . . . . . . . . . . . . . . . . . 314
Interrupt Clear register (LCD_INTCLR, RW -
0xFFE1 0028) . . . . . . . . . . . . . . . . . . . . . . . 314
Upper Panel Current Address register
(LCD_UPCURR, RW - 0xFFE1 002C). . . . . 315
Lower Panel Current Address register
(LCD_LPCURR, RW - 0xFFE1 0030) . . . . . 315
Color Palette registers (LCD_PAL, RW - 0xFFE1
0200 to 0xFFE1 03FC) . . . . . . . . . . . . . . . . 315
Cursor Image registers (CRSR_IMG, RW -
0xFFE1 0800 to 0xFFE1 0BFC) . . . . . . . . . 316
Cursor Control register (CRSR_CTRL, RW -
0xFFE1 0C00) . . . . . . . . . . . . . . . . . . . . . . . 317
Cursor Configuration register (CRSR_CFG, RW -
0xFFE1 0C04) . . . . . . . . . . . . . . . . . . . . . . . 317
Cursor Palette register 0 (CRSR_PAL0, RW -
0xFFE1 0C08) . . . . . . . . . . . . . . . . . . . . . . . 318
Cursor Palette register 1 (CRSR_PAL1, RW -
0xFFE1 0C0C). . . . . . . . . . . . . . . . . . . . . . . 318
Cursor XY Position register (CRSR_XY, RW -
0xFFE1 0C10) . . . . . . . . . . . . . . . . . . . . . . . 319
Cursor Clip Position register (CRSR_CLIP, RW -
0xFFE1 0C14) . . . . . . . . . . . . . . . . . . . . . . . 319
Cursor Interrupt Mask register (CRSR_INTMSK,
RW - 0xFFE1 0C20). . . . . . . . . . . . . . . . . . . 320
Cursor Interrupt Clear register (CRSR_INTCLR,
RW - 0xFFE1 0C24). . . . . . . . . . . . . . . . . . . 320
Cursor Raw Interrupt Status register
7.8
7.9
6.2
Dual DMA FIFOs and associated control logic. . .
287
7.10
7.11
7.12
7.13
7.14
7.15
7.16
7.17
7.18
7.19
7.20
7.21
7.22
7.23
7.24
7.25
7.26
7.1
LCD Configuration register (LCD_CFG, RW -
0xE01F C1B8) . . . . . . . . . . . . . . . . . . . . . . . 303
Horizontal Timing register (LCD_TIMH, RW -
0xFFE1 0000). . . . . . . . . . . . . . . . . . . . . . . . 303
Vertical Timing register (LCD_TIMV, RW - 0xFFE1
0004) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305
7.2
(CRSR_INTRAW, RW - 0xFFE1 0C28) . . . . 321
Cursor Masked Interrupt Status register
(CRSR_INTSTAT, RW - 0xFFE1 0C2C) . . . 321
7.3
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Chapter 36: LPC24XX Supplementary information
9.6.5
USB Control register (USBCtrl - 0xFFE0 C228) .
351
9.7.1
USB Command Code register (USBCmdCode -
0xFFE0 C210). . . . . . . . . . . . . . . . . . . . . . . 351
USB Command Data register (USBCmdData -
0xFFE0 C214). . . . . . . . . . . . . . . . . . . . . . . 352
USB DMA Request Status register (USBDMARSt
- 0xFFE0 C250) . . . . . . . . . . . . . . . . . . . . . 352
USB DMA Request Clear register (USBDMARClr
- 0xFFE0 C254) . . . . . . . . . . . . . . . . . . . . . 353
USB DMA Request Set register (USBDMARSet -
0xFFE0 C258). . . . . . . . . . . . . . . . . . . . . . . 353
USB UDCA Head register (USBUDCAH - 0xFFE0
C280) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
USB EP DMA Status register (USBEpDMASt -
0xFFE0 C284). . . . . . . . . . . . . . . . . . . . . . . 354
USB EP DMA Enable register (USBEpDMAEn -
0xFFE0 C288). . . . . . . . . . . . . . . . . . . . . . . 355
USB EP DMA Disable register (USBEpDMADis -
0xFFE0 C28C) . . . . . . . . . . . . . . . . . . . . . . 355
USB DMA Interrupt Status register (USBDMAIntSt
- 0xFFE0 C290) . . . . . . . . . . . . . . . . . . . . . 355
USB DMA Interrupt Enable register
(USBDMAIntEn - 0xFFE0 C294) . . . . . . . . 356
USB End of Transfer Interrupt Status register
(USBEoTIntSt - 0xFFE0 C2A0). . . . . . . . . . 356
USB End of Transfer Interrupt Clear register
(USBEoTIntClr - 0xFFE0 C2A4) . . . . . . . . . 357
USB End of Transfer Interrupt Set register
(USBEoTIntSet - 0xFFE0 C2A8) . . . . . . . . 357
USB New DD Request Interrupt Status register
(USBNDDRIntSt - 0xFFE0 C2AC) . . . . . . . 357
USB New DD Request Interrupt Clear register
(USBNDDRIntClr - 0xFFE0 C2B0) . . . . . . . 358
USB New DD Request Interrupt Set register
(USBNDDRIntSet - 0xFFE0 C2B4). . . . . . . 358
USB System Error Interrupt Status register
(USBSysErrIntSt - 0xFFE0 C2B8) . . . . . . . . 358
USB System Error Interrupt Clear register
9.7.2
9.8.1
9.1.1
USB Port Select register (USBPortSel - 0xFFE0
C110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
USB Clock Control register (USBClkCtrl -
0xFFE0 CFF4) . . . . . . . . . . . . . . . . . . . . . . . 337
USB Clock Status register (USBClkSt - 0xFFE0
CFF8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
USB Interrupt Status register (USBIntSt -
0xE01F C1C0) . . . . . . . . . . . . . . . . . . . . . . . 338
USB Device Interrupt Status register
(USBDevIntSt - 0xFFE0 C200) . . . . . . . . . . 339
USB Device Interrupt Enable register
(USBDevIntEn - 0xFFE0 C204). . . . . . . . . . 340
USB Device Interrupt Clear register
(USBDevIntClr - 0xFFE0 C208). . . . . . . . . . 340
USB Device Interrupt Set register (USBDevIntSet
- 0xFFE0 C20C) . . . . . . . . . . . . . . . . . . . . . 341
USB Device Interrupt Priority register
(USBDevIntPri - 0xFFE0 C22C) . . . . . . . . . 342
USB Endpoint Interrupt Status register
(USBEpIntSt - 0xFFE0 C230) . . . . . . . . . . . 342
USB Endpoint Interrupt Enable register
(USBEpIntEn - 0xFFE0 C234). . . . . . . . . . . 343
USB Endpoint Interrupt Clear register
(USBEpIntClr - 0xFFE0 C238). . . . . . . . . . . 344
USB Endpoint Interrupt Set register (USBEpIntSet
- 0xFFE0 C23C) . . . . . . . . . . . . . . . . . . . . . 345
USB Endpoint Interrupt Priority register
(USBEpIntPri - 0xFFE0 C240). . . . . . . . . . . 345
USB Realize Endpoint register (USBReEp -
0xFFE0 C244) . . . . . . . . . . . . . . . . . . . . . . . 347
USB Endpoint Index register (USBEpIn - 0xFFE0
C248). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348
USB MaxPacketSize register (USBMaxPSize -
0xFFE0 C24C). . . . . . . . . . . . . . . . . . . . . . . 348
USB Receive Data register (USBRxData -
0xFFE0 C218) . . . . . . . . . . . . . . . . . . . . . . . 349
USB Receive Packet Length register
9.8.2
9.2.1
9.8.3
9.8.4
9.2.2
9.8.5
9.3.1
9.8.6
9.3.2
9.3.3
9.3.4
9.3.5
9.3.6
9.8.7
9.8.8
9.8.9
9.8.10
9.8.11
9.8.12
9.8.13
9.8.14
9.8.15
9.8.16
9.8.17
9.8.18
9.4.1
9.4.2
9.4.3
9.4.4
9.4.5
9.5.2
(USBSysErrIntClr - 0xFFE0 C2BC) . . . . . . . 358
USB System Error Interrupt Set register
(USBSysErrIntSet - 0xFFE0 C2C0) . . . . . . 359
9.5.3
9.5.4
11
Serial interface engine command description . .
362
9.6.1
11.1
11.2
11.3
Set Address (Command: 0xD0, Data: write
1 byte) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
Configure Device (Command: 0xD8, Data: write 1
byte). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
Set Mode (Command: 0xF3, Data: write
1 byte) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
9.6.2
9.6.3
9.6.4
(USBRxPLen - 0xFFE0 C220). . . . . . . . . . . 349
USB Transmit Data register (USBTxData -
0xFFE0 C21C). . . . . . . . . . . . . . . . . . . . . . . 350
USB Transmit Packet Length register
(USBTxPLen - 0xFFE0 C224). . . . . . . . . . . 350
UM10237_2
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Chapter 36: LPC24XX Supplementary information
11.5
Read Test Register (Command: 0xFD, Data: read
2 bytes). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
Set Device Status (Command: 0xFE, Data: write 1
byte) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
Get Device Status (Command: 0xFE, Data: read 1
byte) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
Get Error Code (Command: 0xFF, Data: read 1
byte) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
Read Error Status (Command: 0xFB, Data: read 1
byte) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
Select Endpoint (Command: 0x00 - 0x1F, Data:
read 1 byte (optional)) . . . . . . . . . . . . . . . . . 368
Select Endpoint/Clear Interrupt (Command:
0x40 - 0x5F, Data: read 1 byte) . . . . . . . . . . 369
Set Endpoint Status (Command: 0x40 - 0x55,
Data: write 1 byte (optional)). . . . . . . . . . . . . 369
Clear Buffer (Command: 0xF2, Data: read 1 byte
(optional)) . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
Validate Buffer (Command: 0xFA, Data: none). . .
370
11.6
11.7
11.8
Isochronous OUT Endpoint Operation
11.9
11.10
11.11
11.12
11.13
11.14
14.6.5
Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . 381
Auto Length Transfer Extraction (ATLE) mode
operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 382
14.7
6.3
Connecting USB as one port host and one port
device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 398
7.1
USB Interrupt Status Register (USBIntSt -
0xE01F C1C0) . . . . . . . . . . . . . . . . . . . . . . . 400
6.1
Connecting port U1 to an external OTG
transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . 395
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NXP Semiconductors
Chapter 36: LPC24XX Supplementary information
7.3
OTG Interrupt Enable Register (OTGIntEn -
7.14
7.15
I2C Clock High Register (I2C_CLKHI -
0xFFE0 C30C). . . . . . . . . . . . . . . . . . . . . . . 408
I2C Clock Low Register (I2C_CLKLO -
0xFFE0 C310) . . . . . . . . . . . . . . . . . . . . . . . 409
0xFFE0 C104) . . . . . . . . . . . . . . . . . . . . . . . 401
OTG Interrupt Set Register (OTGIntSet -
0xFFE0 C20C) . . . . . . . . . . . . . . . . . . . . . . . 401
OTG Interrupt Clear Register (OTGIntClr -
0xFFE0 C10C) . . . . . . . . . . . . . . . . . . . . . . . 401
OTG Status and Control Register (OTGStCtrl -
0xFFE0 C110). . . . . . . . . . . . . . . . . . . . . . . . 401
OTG Timer Register (OTGTmr -
0xFFE0 C114). . . . . . . . . . . . . . . . . . . . . . . . 403
OTG Clock Control Register (OTGClkCtrl -
0xFFE0 CFF4) . . . . . . . . . . . . . . . . . . . . . . . 403
OTG Clock Status Register (OTGClkSt -
0xFFE0 CFF8) . . . . . . . . . . . . . . . . . . . . . . . 404
I2C Receive Register (I2C_RX -
0xFFE0 C300) . . . . . . . . . . . . . . . . . . . . . . . 405
I2C Transmit Register (I2C_TX -
0xFFE0 C300) . . . . . . . . . . . . . . . . . . . . . . . 405
I2C Status Register (I2C_STS -
0xFFE0 C304) . . . . . . . . . . . . . . . . . . . . . . . 405
I2C Control Register (I2C_CTL -
0xFFE0 C308) . . . . . . . . . . . . . . . . . . . . . . . 407
7.4
7.5
Set BDIS_ACON_EN in external OTG transceiver
417
Clear BDIS_ACON_EN in external OTG trans-
ceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
4.7
UARTn Line Control Register (U0LCR -
0xE007 C00C) . . . . . . . . . . . . . . . . . . . . . . . 430
UARTn Line Status Register (U0LSR -
0xE007 C014, Read Only). . . . . . . . . . . . . . 431
UARTn Scratch Pad Register (U0SCR -
0xE007 C01C) . . . . . . . . . . . . . . . . . . . . . . . 433
UARTn Auto-baud Control Register (U0ACR -
0xE007 C020) . . . . . . . . . . . . . . . . . . . . . . . 433
4.8
UARTn Receiver Buffer Register (U0RBR -
0xE007 C000 when DLAB = 0, Read Only) . 426
UARTn Transmit Holding Register (U0THR -
0xE007 C000 when DLAB = 0, Write Only) . 426
UARTn Divisor Latch LSB Register (U0DLL -
0xE000 C000, U2DLL - 0xE007 8000, U3DLL -
0xE007 C000 when DLAB = 1) and UARTn
Divisor Latch MSB Register (U0DLM -
0xE000 C004, U2DLL - 0xE007 8004, U3DLL -
0xE007 C004 when DLAB = 1). . . . . . . . . . . 426
UARTn Interrupt Enable Register (U0IER -
0xE007 C004 when DLAB = 0). . . . . . . . . . . 427
UARTn Interrupt Identification Register (U0IIR -
0x7008 C008, Read Only) . . . . . . . . . . . . . . 428
UARTn FIFO Control Register (U0FCR -
16.4.1
4.9
4.2
4.3
4.10
4.11
IrDA Control Register for UART3 Only (U3ICR -
0xE007 C024) . . . . . . . . . . . . . . . . . . . . . . . 436
UARTn Fractional Divider Register (U0FDR -
0xE007 C028) . . . . . . . . . . . . . . . . . . . . . . . 437
4.12
4.4
4.5
4.6
4.12.1.1 Example 1: PCLK = 14.7456 MHz,
BR = 9600 . . . . . . . . . . . . . . . . . . . . . . . . . . 440
4.13
UARTn Transmit Enable Register (U0TER -
0xE007 C030) . . . . . . . . . . . . . . . . . . . . . . . 440
0xE007 C008, Write Only) . . . . . . . . . . . . . . 430
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Chapter 36: LPC24XX Supplementary information
4.1
4.2
4.3
UART1 Receiver Buffer Register (U1RBR -
4.10
4.11
4.12
4.13
UART1 Line Status Register (U1LSR -
0xE001 0014, Read Only) . . . . . . . . . . . . . . 456
UART1 Modem Status Register (U1MSR -
0xE001 0018). . . . . . . . . . . . . . . . . . . . . . . . 457
UART1 Scratch Pad Register (U1SCR -
0xE001 001C) . . . . . . . . . . . . . . . . . . . . . . . 458
UART1 Auto-baud Control Register (U1ACR -
0xE001 0020). . . . . . . . . . . . . . . . . . . . . . . . 458
UART1 Fractional Divider Register (U1FDR -
0xE001 0028). . . . . . . . . . . . . . . . . . . . . . . . 461
0xE001 0000, when DLAB = 0 Read Only) . 447
UART1 Transmitter Holding Register (U1THR -
0xE001 0000 when DLAB = 0, Write Only) . 447
UART1 Divisor Latch LSB and MSB Registers
0xE001 0004, when DLAB = 1) . . . . . . . . . . 447
UART1 Interrupt Enable Register (U1IER -
0xE001 0004, when DLAB = 0) . . . . . . . . . . 448
UART1 Interrupt Identification Register (U1IIR -
0xE001 0008, Read Only) . . . . . . . . . . . . . . 449
UART1 FIFO Control Register (U1FCR -
0xE001 0008, Write Only). . . . . . . . . . . . . . . 452
UART1 Line Control Register (U1LCR -
0xE001 000C). . . . . . . . . . . . . . . . . . . . . . . . 452
UART1 Modem Control Register (U1MCR -
0xE001 0010) . . . . . . . . . . . . . . . . . . . . . . . . 453
4.4
4.5
4.6
4.7
4.8
4.16
4.16.1.1 Example 1: PCLK = 14.7456 MHz,
BR = 9600 . . . . . . . . . . . . . . . . . . . . . . . . . . 464
4.17
UART1 Transmit Enable Register (U1TER -
0xE001 0030). . . . . . . . . . . . . . . . . . . . . . . . 464
8.6
Bus Timing Register (CAN1BTR - 0xE004 4014,
CAN2BTR - 0xE004 8014). . . . . . . . . . . . . . 485
Error Warning Limit Register (CAN1EWL -
0xE004 4018, CAN2EWL - 0xE004 8018). . 487
Status Register (CAN1SR - 0xE004 401C,
CAN2SR - 0xE004 801C) . . . . . . . . . . . . . . 487
Receive Frame Status Register (CAN1RFS -
0xE004 4020, CAN2RFS - 0xE004 8020) . . 489
Receive Identifier Register (CAN1RID -
0xE004 4024, CAN2RID - 0xE004 8024) . . 490
Receive Data Register A (CAN1RDA -
0xE004 4028, CAN2RDA - 0xE004 8028). . 490
Receive Data Register B (CAN1RDB -
0xE004 402C, CAN2RDB - 0xE004 802C) . 491
Transmit Frame Information Register
8.7
8.8
8.9
8.10
8.11
8.12
8.13
CAN2TFI[1/2/3] - 0xE004 80[30/40/50]) . . . 491
Transmit Identifier Register (CAN1TID[1/2/3] -
0xE004 80[34/44/54]). . . . . . . . . . . . . . . . . . 493
Transmit Data Register A (CAN1TDA[1/2/3] -
8.1
Mode Register (CAN1MOD - 0xE004 4000,
CAN2MOD - 0xE004 8000) . . . . . . . . . . . . . 475
Command Register (CAN1CMR - 0xE004 x004,
CAN2CMR - 0xE004 8004) . . . . . . . . . . . . . 476
Global Status Register (CAN1GSR -
0xE004 x008, CAN2GSR - 0xE004 8008) . . 478
Interrupt and Capture Register (CAN1ICR -
0xE004 400C, CAN2ICR - 0xE004 800C) . . 480
Interrupt Enable Register (CAN1IER -
8.14
8.15
8.16
8.2
8.3
0xE004 80[38/48/58]). . . . . . . . . . . . . . . . . . 493
Transmit Data Register B (CAN1TDB[1/2/3] -
8.4
8.5
0xE004 80[3C/4C/5C]). . . . . . . . . . . . . . . . . 494
0xE004 4010, CAN2IER - 0xE004 8010) . . . 484
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17.2.3
Setting the interrupt pending bits
(IntPnd 63 to 0) . . . . . . . . . . . . . . . . . . . . . . 513
Clearing the interrupt pending bits
(IntPnd 63 to 0) . . . . . . . . . . . . . . . . . . . . . . 513
Setting the message lost bit of a FullCAN
message object (MsgLost 63 to 0). . . . . . . . 513
Clearing the message lost bit of a FullCAN
message object (MsgLost 63 to 0). . . . . . . . 513
Set and clear mechanism of the
FullCAN interrupt . . . . . . . . . . . . . . . . . . . . . 513
Scenario 3: Message gets overwritten indicated
by Semaphore bits. . . . . . . . . . . . . . . . . . . . 515
Scenario 3.1: Message gets overwritten indicated
by Semaphore bits and Message Lost. . . . . 515
Scenario 3.2: Message gets overwritten indicated
by Message Lost . . . . . . . . . . . . . . . . . . . . . 516
10.1
Central Transmit Status Register (CANTxSR -
0xE004 0000) . . . . . . . . . . . . . . . . . . . . . . . . 495
Central Receive Status Register (CANRxSR -
0xE004 0004) . . . . . . . . . . . . . . . . . . . . . . . . 496
Central Miscellaneous Status Register (CANMSR
- 0xE004 0008). . . . . . . . . . . . . . . . . . . . . . . 496
17.2.4
17.2.5
17.2.6
17.3
10.2
10.3
17.3.3
17.3.4
17.3.5
15.1
Acceptance Filter Mode Register (AFMR -
0xE003 C000). . . . . . . . . . . . . . . . . . . . . . . . 500
Standard Frame Individual Start Address Register
(SFF_sa - 0xE003 C004) . . . . . . . . . . . . . . . 502
Standard Frame Group Start Address Register
(SFF_GRP_sa - 0xE003 C008) . . . . . . . . . . 502
Extended Frame Start Address Register (EFF_sa
- 0xE003 C00C) . . . . . . . . . . . . . . . . . . . . . . 503
Extended Frame Group Start Address Register
(EFF_GRP_sa - 0xE003 C010) . . . . . . . . . . 503
End of AF Tables Register (ENDofTable -
0xE003 C014). . . . . . . . . . . . . . . . . . . . . . . . 504
LUT Error Address Register (LUTerrAd -
0xE003 C018). . . . . . . . . . . . . . . . . . . . . . . . 504
Global FullCANInterrupt Enable register (FCANIE
- 0xE003 C020) . . . . . . . . . . . . . . . . . . . . . . 505
FullCAN Interrupt and Capture registers
18
Examples of acceptance filter tables and ID
index values. . . . . . . . . . . . . . . . . . . . . . . . . . 518
Example 3: more than one but not all sections are
used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518
Explicit standard frame format identifier section
(11-bit CAN ID): . . . . . . . . . . . . . . . . . . . . . . . 521
Group of standard frame format identifier section
(11-bit CAN ID): . . . . . . . . . . . . . . . . . . . . . . . 521
FullCAN explicit standard frame format identfier
section (11-bit CAN ID) . . . . . . . . . . . . . . . . . 523
Explicit standard frame format identifier section
(11-bit CAN ID) . . . . . . . . . . . . . . . . . . . . . . . 523
15.3
18.3
15.4
15.5
15.6
15.7
15.9
15.11
15.12
0xE003 C028). . . . . . . . . . . . . . . . . . . . . . . . 505
7.1
SPI Control Register (S0SPCR - 0xE002 0000) .
531
SPI Status Register (S0SPSR - 0xE002 0004) . .
532
7.2
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7.4
7.5
SPI Clock Counter Register (S0SPCCR -
0xE002 000C). . . . . . . . . . . . . . . . . . . . . . . . 533
SPI Test Control Register (SPTCR -
7.6
SPI Test Status Register (SPTSR - 0xE002 0014)
534
SPI Interrupt Register (S0SPINT - 0xE002 001C)
534
7.7
0xE002 0010) . . . . . . . . . . . . . . . . . . . . . . . . 533
6.2
6.3
6.4
6.5
6.6
SSPn Control Register 1 (SSP0CR1 -
0xE006 8004, SSP1CR1 - 0xE003 0004) . . 546
SSPn Data Register (SSP0DR - 0xE006 8008,
SSP1DR - 0xE003 0008). . . . . . . . . . . . . . . 547
SSPn Status Register (SSP0SR - 0xE006 800C,
SSP1SR - 0xE003 000C). . . . . . . . . . . . . . . 548
SSPn Clock Prescale Register (SSP0CPSR -
0xE006 8010, SSP1CPSR - 0xE003 0010). 548
SSPn Interrupt Mask Set/Clear Register
0xE003 0014). . . . . . . . . . . . . . . . . . . . . . . . 548
SSPn Raw Interrupt Status Register (SSP0RIS -
0xE006 8018, SSP1RIS - 0xE003 0018). . . 549
SSPn Masked Interrupt Status Register
5.1
Texas Instruments synchronous serial frame
format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537
Clock Polarity (CPOL) and Phase (CPHA) control
538
Setup and hold time requirements on CS with
respect to SK in Microwire mode . . . . . . . . . 544
5.2.1
6.7
6.8
0xE003 001C) . . . . . . . . . . . . . . . . . . . . . . . 549
SSPn Interrupt Clear Register (SSP0ICR -
0xE006 8020, SSP1ICR - 0xE003 0020). . . 550
SSPn DMA Control Register (SSP0DMACR -
550
5.3.1
6.9
6.1
SSPn Control Register 0 (SSP0CR0 -
0xE006 8000, SSP1CR0 - 0xE003 0000) . . 545
6.10
6.1
Power Control Register (MCI Power -
0xE008 C000) . . . . . . . . . . . . . . . . . . . . . . . 564
Clock Control Register (MCIClock -
0xE008 C004) . . . . . . . . . . . . . . . . . . . . . . . 564
Argument Register (MCIArgument -
0xE008 C008) . . . . . . . . . . . . . . . . . . . . . . . 565
Command Register (MCICommand -
6.2
6.3
6.4
6.5
6.6
0xE008 C00C) . . . . . . . . . . . . . . . . . . . . . . . 565
Command Response Register
(MCIRespCommand - 0xE008 C010) . . . . . 566
Response Registers (MCIResponse0-3 -
E008 C020) . . . . . . . . . . . . . . . . . . . . . . . . . 566
Data Timer Register (MCIDataTimer -
0xE008 C024) . . . . . . . . . . . . . . . . . . . . . . . 567
Data Length Register (MCIDataLength -
0xE008 C028) . . . . . . . . . . . . . . . . . . . . . . . 567
Data Control Register (MCIDataCtrl -
0xE008 C02C) . . . . . . . . . . . . . . . . . . . . . . . 568
Data Counter Register (MCIDataCnt -
0xE008 C030) . . . . . . . . . . . . . . . . . . . . . . . 568
6.7
6.8
6.9
6.10
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6.14
FIFO Counter Register (MCIFifoCnt -
0xE008 C048). . . . . . . . . . . . . . . . . . . . . . . . 571
6.15
9.7
Data FIFO Register (MCIFIFO - 0xE008 C080 to
0xE008 C0BC). . . . . . . . . . . . . . . . . . . . . . . 571
Simultaneous repeated START conditions from
two masters . . . . . . . . . . . . . . . . . . . . . . . . . 600
601
0xE001 C000, 0xE005 C000, 0xE008 0000) 582
0xE001 C018, 0xE005 C018, 0xE008 0018) 584
0xE001 C004, 0xE005 C004, 0xE008 0004) 584
0xE005 C008, 0xE008 0008) . . . . . . . . . . . . 585
0xE001 C00C, 0xE005 C00C, 0xE008 000C) 585
(I2C[0/1/2]SCLH - 0xE001 C010, 0xE005 C010,
0xE008 0010) . . . . . . . . . . . . . . . . . . . . . . . . 585
(I2C[0/1/2]SCLL - 0xE001 C014, 0xE005 C014,
0xE008 0014) . . . . . . . . . . . . . . . . . . . . . . . . 585
cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585
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Chapter 36: LPC24XX Supplementary information
5.6
DMA Configuration Register 1 (I2SDMA1 -
0xE008 8014). . . . . . . . . . . . . . . . . . . . . . . . 616
DMA Configuration Register 2 (I2SDMA2 -
0xE008 8018). . . . . . . . . . . . . . . . . . . . . . . . 616
Interrupt Request Control Register (I2SIRQ -
0xE008 801C) . . . . . . . . . . . . . . . . . . . . . . . 616
Transmit Clock Rate Register (I2STXRATE -
0xE008 8020). . . . . . . . . . . . . . . . . . . . . . . . 617
Receive Clock Rate Register (I2SRXRATE -
0xE008 8024). . . . . . . . . . . . . . . . . . . . . . . . 617
5.7
5.1
Digital Audio Output Register (I2SDAO -
0xE008 8000) . . . . . . . . . . . . . . . . . . . . . . . . 614
Digital Audio Input Register (I2SDAI -
0xE008 8004) . . . . . . . . . . . . . . . . . . . . . . . . 614
Transmit FIFO Register (I2STXFIFO -
0xE008 8008) . . . . . . . . . . . . . . . . . . . . . . . . 615
Receive FIFO Register (I2SRXFIFO -
5.8
5.2
5.3
5.4
5.5
5.9
5.10
0xE008 800C). . . . . . . . . . . . . . . . . . . . . . . . 615
Status Feedback Register (I2SSTATE -
0xE008 8010) . . . . . . . . . . . . . . . . . . . . . . . . 615
6.5
6.6
Prescale register (T0PR - T3PR, 0xE000 400C,
0xE000 800C, 0xE007 000C, 0xE007 400C) 626
Prescale Counter register (T0PC - T3PC,
0xE007 4010). . . . . . . . . . . . . . . . . . . . . . . . 626
Match Control Register (T[0/1/2/3]MCR -
0xE007 4014). . . . . . . . . . . . . . . . . . . . . . . . 627
Capture Control Register (T[0/1/2/3]CCR -
0xE007 4028). . . . . . . . . . . . . . . . . . . . . . . . 628
External Match Register (T[0/1/2/3]EMR -
6.8
Interrupt Register (T[0/1/2/3]IR - 0xE000 4000,
0xE000 8000, 0xE007 0000, 0xE007 4000). 624
Timer Control Register (T[0/1/2/3]CR -
0xE007 4004) . . . . . . . . . . . . . . . . . . . . . . . . 624
Count Control Register (T[0/1/2/3]CTCR -
0xE007 4070) . . . . . . . . . . . . . . . . . . . . . . . . 625
Timer Counter . . . . . . . .registers (T0TC - T3TC,
0xE007 4008) . . . . . . . . . . . . . . . . . . . . . . . . 626
6.1
6.10
6.2
6.3
6.4
6.11
0xE007 403C) . . . . . . . . . . . . . . . . . . . . . . . 629
6.2
6.3
PWM Timer Control Register (PWM0TCR -
0xE001 4004 and PWM1TCR 0xE001 8004) 640
PWM Count Control Register (PWM0CTCR -
641
PWM Match Control Register (PWM0MCR -
0xE001 4014 and PWM1MCR 0xE001 8014) 641
PWM Capture Control Register (PWM0CCR -
0xE001 4028 and PWM1CCR 0xE001 8028) 643
PWM Control Registers (PWM0PCR -
644
3.1
Rules for single edge controlled PWM outputs. . .
635
Rules for double edge controlled PWM outputs . .
635
6.4
6.5
6.6
3.2
3.3
Summary of differences from the standard timer
block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635
6.1
PWM Interrupt Register (PWM0IR - 0xE001 4000
and PWM1IR 0xE001 8000). . . . . . . . . . . . . 639
6.7
PWM Latch Enable Register (PWM0LER -
0xE001 4050 and PWM1LER 0xE001 8050) 645
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6.3.3
Consolidated Time Register 2 (CTIME2 -
0xE002 401C) . . . . . . . . . . . . . . . . . . . . . . . 654
Interrupt Location Register (ILR - 0xE002 4000) .
650
6.2.1
6.2.2
Clock Tick Counter Register (CTCR -
0xE002 4004) . . . . . . . . . . . . . . . . . . . . . . . . 651
Counter Increment Interrupt Register (CIIR -
0xE002 400C). . . . . . . . . . . . . . . . . . . . . . . . 652
Counter Increment Select Mask Register (CISS -
0xE002 4040) . . . . . . . . . . . . . . . . . . . . . . . . 652
Consolidated Time Register 0 (CTIME0 -
10.2
Prescaler Integer Register (PREINT -
0xE002 4080). . . . . . . . . . . . . . . . . . . . . . . . 657
Prescaler Fraction Register (PREFRAC -
0xE002 4084). . . . . . . . . . . . . . . . . . . . . . . . 658
6.2.4
6.2.5
10.3
6.3.1
12
0xE002 4014) . . . . . . . . . . . . . . . . . . . . . . . . 654
Consolidated Time Register 1 (CTIME1 -
RTC external 32 kHz oscillator component
6.3.2
selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 660
0xE002 4018) . . . . . . . . . . . . . . . . . . . . . . . . 654
4.3
4.4
4.5
Watchdog Feed Register (WDFEED -
0xE000 0008). . . . . . . . . . . . . . . . . . . . . . . . 664
Watchdog Timer Value Register (WDTV -
0xE000 000C) . . . . . . . . . . . . . . . . . . . . . . . 665
Watchdog Timer Clock Source Selection Register
(WDCLKSEL - 0xE000 0010) . . . . . . . . . . . 665
4.1
Watchdog Mode Register (WDMOD -
0xE000 0000) . . . . . . . . . . . . . . . . . . . . . . . . 663
Watchdog Timer Constant Register (WDTC -
0xE000 0004) . . . . . . . . . . . . . . . . . . . . . . . . 664
4.2
5.3
5.4
5.5
A/D Status Register (AD0STAT - 0xE003 4030) .
671
A/D Interrupt Enable Register (AD0INTEN -
0xE003 400C) . . . . . . . . . . . . . . . . . . . . . . . 672
A/D Data Registers (AD0DR0 to AD0DR7 -
0xE003 4010 to 0xE003 402C) . . . . . . . . . . 672
5.1
A/D Control Register (AD0CR - 0xE003 4000). . .
669
A/D Global Data Register (AD0GDR -
0xE003 4004) . . . . . . . . . . . . . . . . . . . . . . . . 670
5.2
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Rev. 02 — 19 December 2008
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UM10237
NXP Semiconductors
Chapter 36: LPC24XX Supplementary information
9.9
Erase sector(s) <start sector number> <end
sector number> . . . . . . . . . . . . . . . . . . . . . . 688
Blank check sector(s) <sector number> <end
sector number> . . . . . . . . . . . . . . . . . . . . . . 688
Compare <address1> <address2> <no of bytes>
689
9.10
9.13
Compare <address1> <address2> <no of bytes>
695
10.7
Write to RAM <start address>
<number of bytes> . . . . . . . . . . . . . . . . . . . . 685
Prepare sector(s) for write operation <start sector
number> <end sector number> . . . . . . . . . . 686
Copy RAM to Flash <Flash address> <RAM
address> <no of bytes> . . . . . . . . . . . . . . . . 687
9.4
9.6
9.7
6.4
Write to RAM <start address>
<number of bytes>. . . . . . . . . . . . . . . . . . . . 702
Compare <address1> <address2>
6.9
<no of bytes> . . . . . . . . . . . . . . . . . . . . . . . . 705
Compare <address1> <address2> <no of bytes>
709
7.3
The completion of the DMA transfer
4.2.13
indication . . . . . . . . . . . . . . . . . . . . . . . . . . . 717
UM10237_2
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 02 — 19 December 2008
790 of 792
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UM10237
NXP Semiconductors
Chapter 36: LPC24XX Supplementary information
6.1.13
6.1.14
Configuration Register (DMACConfiguration -
0xFFE0 4030) . . . . . . . . . . . . . . . . . . . . . . . 726
Synchronization Register (DMACSync -
0xFFE0 4034) . . . . . . . . . . . . . . . . . . . . . . . 726
Channel Source Address Registers
DMACC1SrcAddr - 0xFFE0 4120). . . . . . . . 727
Channel Destination Address Registers
5.5
Disabling a DMA channel without losing data in
the FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . 719
Disabling a DMA channel and losing data in the
FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 719
6.2.1
5.7
6.2.2
6.2.3
6.2.4
DMACC1DestAddr - 0xFFE0 4124). . . . . . . 727
Channel Linked List Item Registers (DMACC0LLI
0xFFE0 4128) . . . . . . . . . . . . . . . . . . . . . . . 728
Channel Control Registers (DMACC0Control -
0xFFE0 412C) . . . . . . . . . . . . . . . . . . . . . . . 728
Channel Configuration Registers
DMACC1Configuration - 0xFFE0 4130) . . . 731
Interrupt Status Register (DMACIntStatus -
0xFFE0 4000). . . . . . . . . . . . . . . . . . . . . . . . 721
Interrupt Terminal Count Status Register
(DMACIntTCStatus - 0xFFE0 4004) . . . . . . . 722
Interrupt Terminal Count Clear Register
(DMACIntClear - 0xFFE0 4008) . . . . . . . . . . 722
Interrupt Error Status Register
(DMACIntErrorStatus - 0xFFE0 400C) . . . . . 722
Interrupt Error Clear Register (DMACIntErrClr -
0xFFE0 4010). . . . . . . . . . . . . . . . . . . . . . . . 723
Raw Interrupt Terminal Count Status Register
(DMACRawIntTCStatus - 0xFFE0 4014) . . . 723
Raw Error Interrupt Status Register
(DMACRawIntErrorStatus - 0xFFE0 4018). . 723
Enabled Channel Register (DMACEnbldChns -
0xFFE0 401C) . . . . . . . . . . . . . . . . . . . . . . . 724
Software Burst Request Register
6.1.1
6.1.2
6.1.3
6.1.4
6.1.5
6.1.6
6.1.7
6.1.8
6.1.9
6.1.10
6.1.11
6.1.12
6.2.6
8.2
Programming the GPDMA for scatter/gather DMA
734
(DMACSoftBReq - 0xFFE0 4020). . . . . . . . . 724
Software Single Request Register
(DMACSoftSReq - 0xFFE0 4024). . . . . . . . . 725
Software Last Burst Request Register
(DMACSoftLBreq - 0xFFE0 4028) . . . . . . . . 725
Software Last Single Request Register
(DMACSoftLSReq - 0xFFE0 402C) . . . . . . . 725
10.1
Peripheral-to-memory, or Memory-to-peripheral
DMA flow . . . . . . . . . . . . . . . . . . . . . . . . . . . 737
UM10237_2
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 02 — 19 December 2008
791 of 792
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UM10237
NXP Semiconductors
Chapter 36: LPC24XX Supplementary information
792
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© NXP B.V. 2008.
All rights reserved.
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Date of release: 19 December 2008
Document identifier: UM10237_2
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