HC705C9AGRSSLASHD datasheet(51/157 Pages) NXP

51 / 157 page

MC68HC705C9A — Rev. 2.0

Resets

General Release Specification — MC68HC705C9A

Section 5. Resets

5.1 Contents

5.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

5.3

Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

5.4

RESET Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

5.5

Computer Operating Properly (COP) Reset . . . . . . . . . . . . . . .54

5.6

MC68HC05C9A Compatible COP . . . . . . . . . . . . . . . . . . . . . .54

5.6.1

C9A COP Reset Register . . . . . . . . . . . . . . . . . . . . . . . . . .55

5.6.2

C9A COP Control Register . . . . . . . . . . . . . . . . . . . . . . . . .56

5.7

MC68HC05C12A Compatible COP . . . . . . . . . . . . . . . . . . . . .58

5.8

MC68HC05C12A Compatible COP Clear Register . . . . . . . . .58

5.9

COP During Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

5.10

COP During Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

5.10.1

Clock Monitor Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

5.10.2

STOP Instruction Disable Option . . . . . . . . . . . . . . . . . . . .59

5.2 Introduction

The MCU can be reset four ways: by the initial power-on reset function,

by an active low input to the RESET pin, by the COP, or by the clock

monitor. A reset immediately stops the operation of the instruction being

executed, initializes some control bits, and loads the program counter

with a user-defined reset vector address. Figure 5-1 is a block diagram

of the reset sources.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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