ST7263BHX datasheet(80/186 Pages) STMICROELECTRONICS

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On-chip peripherals

ST7263Bxx

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Doc ID 7516 Rev 8

11.3

Serial communications interface (SCI)

11.3.1

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.

11.3.2

Main features

●

Full duplex, asynchronous communications

●

NRZ standard format (Mark/Space)

●

Independently programmable transmit and receive baud rates up to 250K baud.

●

Programmable data word length (8 or 9 bits)

●

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

●

Two receiver Wakeup modes:

– Address bit (MSB)

– Idle line

●

Muting function for multiprocessor configurations

●

Separate enable bits for Transmitter and Receiver

●

Four error detection flags:

– Overrun error

– Noise error

–Frame error

– Parity error

●

Six interrupt sources with flags:

– Transmit data register empty

– Transmission complete

– Receive data register full

– Idle line received

– Overrun error detected

– Parity error

●

Parity control:

– Transmits parity bit

– Checks parity of received data byte

●

Reduced power consumption mode

11.3.3

General description

The interface is externally connected to another device by two pins (see Figure 42):

●

TDO: Transmit Data output. When the transmitter and the receiver are disabled, the

output pin returns to its I/O port configuration. When the transmitter and/or the receiver

are enabled and nothing is to be transmitted, the TDO pin is at high level.

●

RDI: Receive Data input is the serial data input. Oversampling techniques are used for

data recovery by discriminating between valid incoming data and noise.

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