LPC2888 datasheet(19/34 Pages) PHILIPS

19 / 34 page

LPC2880_LPC2888_1

Preliminary data sheet

Rev. 01 — 22 June 2006

19 of 34

Philips Semiconductors

LPC2880; LPC2888

16/32-bit ARM microcontrollers with external memory interface

• Optional interrupt via Event Router.

• 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

• 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.

• 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 I2C-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

• 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.

• The GPDMA supports a subset of the ﬂow control signals supported by ARM DMA

channels, speciﬁcally ‘single’ but not ‘burst’ operation.

• 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.

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

transfers.

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

the ARM7 processor and the USB interface.

• Incrementing or non-incrementing addressing for source and destination.

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

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

formats during a transfer.

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