MC68HC705MC4MP datasheet(53/180 Pages) FREESCALE

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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.

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