HC705MC4GRSSLASHD datasheet(53/180 Pages) NXP

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General Release Specification

Operating Modes

General Release Specification — MC68HC705MC4

Section 6. Operating Modes

6.1 Contents

6.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

6.3

User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

6.4

Bootloader Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

6.4.1

Bootloader Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

6.4.2

EPROM Programming Register . . . . . . . . . . . . . . . . . . . . .59

6.4.3

Mask Option Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

6.5

Low-Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

6.6

WAIT Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

6.7

COP Watchdog Timer Considerations . . . . . . . . . . . . . . . . . . .62

6.2 Introduction

The MC68HC705MC4 has two modes of operation that affect the pinout

and architecture of the MCU: user mode and bootloader (EPROM

self-programming) mode. The user mode normally will be used, and the

bootloader mode is required for the special needs of EPROM

programming.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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