RM0312 datasheet(225/275 Pages) STMICROELECTRONICS

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DocID022352 Rev 3

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RM0312

Universal synchronous/asynchronous receiver transmitter (USART)

249

21.2

USART main features

•

Full duplex, asynchronous communications

•

NRZ standard format (Mark/Space)

•

High-precision baud rate generator system

–

Common programmable transmit and receive baud rates up to fMASTER/16

•

Programmable data word length (8 or 9 bits)

•

Configurable STOP bits - support for 1 or 2 STOP bits

•

Transmitter clock output for synchronous communication

•

Separate enable bits for Transmitter and Receiver

•

Transfer detection flags:

–

Receive buffer full

–

Transmit buffer empty

–

End of Transmission flags

•

Parity control:

–

Transmits parity bit

–

Checks parity of received data byte

•

4 error detection flags:

–

Overrun error

–

Noise error

–

Frame error

–

Parity error

•

5 interrupt sources with flags:

–

Transmit data register empty

–

Transmission complete

–

Receive data register full

–

Idle line received

–

Parity error

•

2 interrupt vectors:

–

Transmitter interrupt

–

Receiver interrupt

•

Reduced power consumption mode

•

Multi-Processor communication - enter into mute mode if address match does not

occur

•

Wakeup from mute mode (by idle line detection or address mark detection)

•

2 receiver wakeup modes:

–

Address bit (MSB)

–

Idle line

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