AT91 datasheet(14/153 Pages) ATMEL

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AT91X40 Series

1354D–ATARM–08/02

User Peripherals

USART: Universal

Synchronous/

Asynchronous Receiver

Transmitter

The AT91X40 Series provides two identical, full-duplex, universal synchronous/asyn-

chronous receiver/transmitters.

Each USART has its own baud rate generator, and two dedicated Peripheral Data Con-

troller channels. The data format includes a start bit, up to 8 data bits, an optional

programmable parity bit and up to 2 stop bits.

The USART also features a Receiver Timeout register, facilitating variable length Frame

support when it is working with the PDC, and a Time Guard register, used when interfac-

ing with slow remote equipment.

TC: Timer Counter

The AT91X40 Series features a Timer Counter block that includes three identical 16-bit

timer counter channels. Each channel can be independently programmed to perform a

wide range of functions, including frequency measurement, event counting, interval

measurement, pulse generation, delay timing and pulse-width modulation.

The Timer Counter can be used in Capture or Waveform Mode, and all three counter

channels can be started simultaneously and chained together.

AT91 Datasheet(PDF) 14 Page - ATMEL Corporation