LPC2470 datasheet(39/72 Pages) PHILIPS

39 / 72 page

LPC2470_0

Preliminary data sheet

Rev. 00.01 — 5 October 2007

39 of 72

NXP Semiconductors

LPC2470

Fast communication chip

7.20.1 Features

• The interface has separate input/output channels each of which can operate in master

or slave mode.

• Capable of handling 8-bit, 16-bit, and 32-bit word sizes.

• Mono and stereo audio data supported.

• The sampling frequency can range from 16 kHz to 48 kHz (16, 22.05, 32, 44.1,

48) kHz.

• Configurable word select period in master mode (separately for I2S input and 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 GPDMA block.

• Controls include reset, stop, and mute options separately for I2S input and I2S output.

7.21 General purpose 32-bit timers/external event counters

The LPC2470 includes four 32-bit Timer/Counters. The Timer/Counter is designed to

count cycles of the system derived clock or an externally-supplied clock. It can optionally

generate interrupts or perform other actions at specified timer values, based on four

match registers. The Timer/Counter also includes four capture inputs to trap the timer

value when an input signal transitions, optionally generating an interrupt.

7.21.1 Features

• 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.

LPC2470 Datasheet(PDF) 39 Page - NXP Semiconductors

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