LPC2880 Datasheet

IC型号：
LPC2880
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Philips Semiconductors [16/32-bit ARM microcontrollers; 8 k...
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164.40KB
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PHILIPS

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Philips Semiconductors

LPC2880; LPC2888

16/32-bit ARM microcontrollers with external memory interface

鈥?/div>

Optional interrupt via Event Router.

鈥?/div>

32-bit Prescaler and 32-bit Counter allow extended watchdog period.

6.11 Real-time clock

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 either mode.

6.11.1 Features

鈥?/div>

Measures the passage of time to maintain a calendar and clock.

鈥?/div>

Ultra Low Power design to support battery powered systems.

鈥?/div>

Provides Seconds, Minutes, Hours, Day of Month, Month, Year, Day of Week, and Day

of Year.

鈥?/div>

Dedicated 32 kHz oscillator.

鈥?/div>

Dedicated power supply pin can be connected to a battery or to the main 1.8 V.

6.12 General purpose DMA controller

The General Purpose DMA Controller (GPDMA) is an AMBA AHB compliant master

allowing selected LPC2880/LPC2888 peripherals to have DMA support. Peripherals that

can be serviced by the GPDMA channels include the MCI/SD card interface, UART TX

and/or RX, the I

C-bus interface, the Simple Analog Out (SAO) front-ends to the I2S/DAO

and 16-bit dual DACs, the Simple Analog In (SAI) interfaces for data from the I2S/DAI and

16-bit dual ADCs, and the output to the LCD interface.

6.12.1 Features

鈥?/div>

Eight DMA channels. Each channel can support a unidirectional transfer, or a pair of

channels can be used together to follow a linked list of buffer addresses and transfer

counts.

The GPDMA provides 16 peripheral DMA request lines. Most of these are connected

to the peripherals listed above; two can be used for external requests.

鈥?/div>

The GPDMA supports a subset of the 铿俹w control signals supported by ARM DMA

channels, speci铿乧ally 鈥榮ingle鈥?but not 鈥榖urst鈥?operation.

鈥?/div>

Memory-to-memory, memory-to-peripheral, peripheral-to-memory, and

peripheral-to-peripheral transfers.

鈥?/div>

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.

鈥?/div>

Rotating channel priority. Each DMA channel has equal opportunity to perform

transfers.

鈥?/div>

The GPDMA is one of three AHB masters in the LPC2880/LPC2888, the others being

the ARM7 processor and the USB interface.

鈥?/div>

Incrementing or non-incrementing addressing for source and destination.

鈥?/div>

Supports 8-bit, 16-bit, and 32-bit wide transactions.

鈥?/div>

GPDMA channels can be programmed to swap data between big- and little-endian

formats during a transfer.

LPC2880_LPC2888_1

Preliminary data sheet

Rev. 01 鈥?22 June 2006

19 of 34

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