MC68020 查看數據表（PDF） - Freescale Semiconductor

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MC68020

MICROPROCESSORS USER’S MANUAL

Freescale Semiconductor 

9/29/95

FreSeEsCcTaIOlNe 1S: eOmVEicRoVInEdWuctor, Inc. UM Rev 1

Paragraph

Number

TABLE OF CONTENTS

Title

Page

Number

1.1

1.2

1.3

1.4

1.5

1.5.1

1.5.2

1.6

1.7

2.1

2.1.1

2.1.2

2.1.3

2.2

2.3

2.3.1

2.3.2

3.1

3.2

3.3

3.4

3.5

3.6

3.7

3.8

3.9

3.10

3.11

Section 1

Introduction

Features ..................................................................................................1-2

Programming Model ................................................................................1-4

Data Types and Addressing Modes Overview ........................................1-8

Instruction Set Overview .........................................................................1-10

Virtual Memory and Virtual Machine Concepts .......................................1-10

Virtual Memory ....................................................................................1-10

Virtual Machine ....................................................................................1-12

Pipelined Architecture .............................................................................1-12

Cache Memory ........................................................................................1-13

Section 2

Processing States

Privilege Levels .......................................................................................2-2

Supervisor Privilege Level ...................................................................2-2

User Privilege Level .............................................................................2-3

Changing Privilege Level ..................................................................... 2-3

Address Space Types .............................................................................2-4

Exception Processing..............................................................................2-5

Exception Vectors ................................................................................2-5

Exception Stack Frame .......................................................................2-6

Section 3

Signal Description

Signal Index ............................................................................................3-2

Function Code Signals (FC2–FC0) .........................................................3-2

Address Bus (A31–A0, MC68020)(A23–A0, MC68EC020) ....................3-2

Data Bus (D31–D0) .................................................................................3-2

Transfer Size Signals (SIZ1, SIZ0) .........................................................3-2

Asynchronous Bus Control Signals .........................................................3-4

Interrupt Control Signals..........................................................................3-5

Bus Arbitration Control Signals ...............................................................3-6

Bus Exception Control Signals ................................................................3-6

Emulator Support Signal .........................................................................3-7

Clock (CLK) .............................................................................................3-7

MOTOROLA

M68020 USER’S MANUAL

vii

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