AN1212 Freescale Semiconductor / Motorola, AN1212 Datasheet

AN1212

Manufacturer Part Number

AN1212

Description

J1850 Multiplex Bus Communication Using the MC68HC705C8 and the SC371016 J1850 Communications Interface (JCI)

Manufacturer

Freescale Semiconductor / Motorola

Datasheet

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Application Note

AN1212/D

Rev. 1, 11/2001

J1850 Multiplex Bus

Commmunication Using

the MC68HC705C8 and

the SC371016 J1850

Communications Interface

(JCI)

By Chuck Powers

Introduction

J1850 Overview

Multiplex Applications

The SC371016 J1850 communications interface (JCI) is a serial multiplex

communication device developed and manufactured by Motorola for

communicating on an automotive serial multiplex bus compatible with the

Society of Automotive Engineers Recommended Practice J1850-Class B Data

Communication Network Interface. The JCI, which can be easily interfaced to

a wide variety of microcontrollers, can be used to transmit and receive serial

messages within the framework of J1850, while requiring a minimum of host

MCU intervention. The JCI handles all of the communication duties, including

complete message buffering, bus access, arbitration and message

qualification. Host intervention is only required when a complete message has

been received error-free from the multiplex bus, or when the JCI is ready to

receive a message for transmission onto the multiplex bus.

This application note describes a basic set of driver routines for communicating

on a Class B serial multiplex bus using the JCI and the MC68HC705C8, a

multipurpose MCU based upon Motorola’s industry standard M68HC05 CPU.

Methods will be outlined on interfacing the JCI to the MC68HC705C8,

initializing the JCI for proper communication, and transferring data between the

JCI and the host MCU. Though these driver routines have been written for use

with the MC68HC705C8, the methods described are readily applicable to other

microcontroller families.

The increase in the complexity and number of electronic components in

automobiles has caused a massive increase in the wiring harness

requirements for each vehicle. This, in turn, has led to the demand for a means

of reducing the amount of wiring needed while at the same time maintaining or

improving the communication between various components.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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