M68ICS08GR datasheet(139/408 Pages) FREESCALE

139 / 408 page

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Central Processing Unit (CPU)

139

Technical Data — MC68HC908GR8

Section 10. Central Processing Unit (CPU)

10.1 Contents

10.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

10.3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

10.4

CPU registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

10.5

Arithmetic/logic unit (ALU) . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

10.6

Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145

10.7

CPU during break interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . 146

10.8

Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

10.9

Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

10.2 Introduction

The M68HC08 CPU (central processor unit) is an enhanced and fully

object-code-compatible version of the M68HC05 CPU. The CPU08

Reference Manual (Motorola document order number CPU08RM/AD)

contains a description of the CPU instruction set, addressing modes,

and architecture.

10.3 Features

•

Object code fully upward-compatible with M68HC05 Family

•

16-bit stack pointer with stack manipulation instructions

•

16-bit index register with x-register manipulation instructions

•

8-MHz CPU internal bus frequency

Freescale Semiconductor, Inc.

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