HC705CT4GRSSLASHD datasheet(105/152 Pages) NXP

105 / 152 page

MC68HC705CT4 — Rev. 2.0

General Release Specification

MOTOROLA

Miscellaneous Register

105

General Release Specification — MC68HC705CT4

Section 14. Miscellaneous Register

14.1 Contents

14.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105

14.3

Miscellaneous Control Register . . . . . . . . . . . . . . . . . . . . . . .105

14.4

Miscellaneous Register Power Supply Source . . . . . . . . . . . .106

14.2 Introduction

The miscellaneous register exists to hold various system control bits. It

is located at address $0021.

14.3 Miscellaneous Control Register

SPEED — CPU Speed Select

This control bit, when set, selects an additional divide-by-eight after

the already divide-by-five from the oscillator clock to the internal bus

clock. This makes the internal CPU clock a divide-by-40 from the

oscillator input.

When clear, the internal bus clock is a divide-by-five from the

oscillator input. Reset clears this bit.

Address:

$0021

Bit 7

654321

Bit 0

Read:

0000

SPEED

COE

PWME

Write:

Reset:

00000000

Figure 14-1. Miscellaneous Control Register (MISCR)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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