ST92196A datasheet(192/268 Pages) STMICROELECTRONICS

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- SERIAL COMMUNICATIONS INTERFACE (SCI)

8.11 SERIAL COMMUNICATIONS INTERFACE (SCI)

8.11.1 Introduction

The Serial Communications Interface (SCI) offers

full-duplex asynchronous serial data exchange for

interfacing a wide range of external equipment. It

has the following principal features:

Full duplex asynchronous operation.

Transmit, receive, line status, and device

address interrupt generation.

Integral Baud Rate Generator capable of

dividing the input clock by any value from 2 to

216-1 (16 bit word) and generating the internal

16X data sampling clock for asynchronous

operation.

Fully programmable serial interface:

– 5, 6, 7, or 8 bit word length.

– Even, odd, or no parity generation and detec-

tion.

– 0, 1, 1-1/2, 2, 2-1/2, 3 stop bit generation.

– Complete status reporting capabilities.

– Line break generation and detection.

Programmable address indication bit (wake-up

bit) and user invisible compare logic to support

multiple microcomputer networking. Optional

character search function.

Internal diagnostic capabilities:

– Local loopback for communications link fault

isolation.

– Auto-echo for communications link fault isola-

tion.

Separate interrupt/DMA channels for transmit

and receive.

Figure 82. SCI Block Diagram

TRANSMIT

BUFFER

SHIFT

TRANSMIT

SHIFT

RECEIVER

COMPARE

ADDRESS

BUFFER

RECEIVER

DMA

CONTROLLER

CLOCK and

BAUD RATE

GENERATOR

ST9 CORE BUS

SOUT

SIN

Frame Control

and STATUS

DMA

CONTROLLER

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