MC68HC908GR4MP datasheet(161/286 Pages) FREESCALE

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MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

161

Chapter 18

Serial Communications Interface (SCI)

18.1 Introduction

This section describes the serial communications interface (SCI) module, which allows high-speed

asynchronous communications with peripheral devices and other MCUs.

18.2 Features

Features of the SCI module include:

•

Full-duplex operation

•

Standard mark/space non-return-to-zero (NRZ) format

•

32 programmable baud rates

•

Programmable 8-bit or 9-bit character length

•

Separately enabled transmitter and receiver

•

Separate receiver and transmitter CPU interrupt requests

•

Programmable transmitter output polarity

•

Two receiver wakeup methods:

–

Idle line wakeup

–

Address mark wakeup

•

Interrupt-driven operation with eight interrupt flags:

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Transmitter empty

–

Transmission complete

–

Receiver full

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Idle receiver input

–

Receiver overrun

–

Noise error

–

Framing error

–

Parity error

•

Receiver framing error detection

•

Hardware parity checking

•

1/16 bit-time noise detection

•

Configuration register bit, SCIBDSRC, to allow selection of baud rate clock source

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