© Motorola, Inc., 2000

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Motorola Semiconductor Engineering Bulletin

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How to Use the MC68HC812A4 in Special Expanded

Narrow Mode Using the M68HC12AEVB

By Edgar Saenz

Motorola Microcontroller Division

Austin, Texas

Introduction

The MC68HC812A4 (812A4) is designed primarily as an expanded

mode microcontroller. It can be operated in expanded narrow mode for

8-bit peripheral devices and in expanded wide mode for 16-bit peripheral

devices.

The M68HC12A4EVB (A4EVB) is designed to accommodate expanded

narrow mode of operation, although in the factory it is configured in

expanded wide mode.

The steps to set up the evaluation board are described in this

engineering bulletin. They are designed to help guide users to configure

emulation RAM (random-access memory) in expanded narrow mode

and to utilize a third-party debugger to debug in C language.

Freescale Semiconductor, Inc.

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Go to: www.freescale.com