ST72344S4 datasheet(129/247 Pages) STMICROELECTRONICS

129 / 247 page

ST72344xx, ST2345xx

On-chip peripherals

Doc ID 12321 Rev 6

129/247

11.5

SCI serial communication interface

11.5.1

Introduction

The serial communications interface (SCI) offers a flexible means of full-duplex data

exchange with external equipment requiring an industry standard NRZ asynchronous serial

data format. The SCI offers a very wide range of baud rates using two baud rate generator

systems.

11.5.2

Main features

●

Full-duplex, asynchronous communications

●

NRZ standard format (Mark/Space)

●

Dual baud rate generator systems

●

Independently programmable transmit and receive baud rates up to 500,000 baud

●

Programmable data word length (8 or 9 bits)

●

Receive buffer full, Transmit buffer empty and End of Transmission flags

●

2 receiver wake-up modes:

–

Address bit (MSB)

–

Idle line

●

Muting function for multiprocessor configurations

●

Separate enable bits for Transmitter and Receiver

●

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

–

Overrun error detected

●

Parity control:

–

Transmits parity bit

–

Checks parity of received data byte

●

Reduced power consumption mode

11.5.3

General description

The interface is externally connected to another device by three pins (see Figure 63). Any

SCI bidirectional communication requires a minimum of two pins: Receive Data In (RDI) and

Transmit Data Out (TDO):

●

SCLK: Transmitter clock output. This pin outputs the transmitter data clock for

synchronous transmission (no clock pulses on start bit and stop bit, and a software

option to send a clock pulse on the last data bit). This can be used to control

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