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68000

8-/16-/32-Bit Microprocessors User’s Manual

Freescale Semiconductor 

Freescale Semiconductor, Inc.

Paragraph

Number

4.1

4.1.1

4.1.2

4.1.3

4.2

5.1

5.1.1

5.1.2

5.1.3

5.1.4

5.2

5.2.1

5.2.2

5.2.3

5.3

5.4

5.4.1

5.4.2

5.4.3

5.4.4

5.5

5.6

5.7

5.8

6.1

6.1.1

6.1.2

6.1.3

6.1.4

6.2

6.2.1

6.2.2

6.2.3

TABLE OF CONTENTS (Continued)

Title

Page

Number

Section 4

8-Bit Bus Operations

Data Transfer Operations.............................................................................4-1

Read Operations ......................................................................................4-1

Write Cycle ............................................................................................... 4-3

Read-Modify-Write Cycle..........................................................................4-5

Other Bus Operations...............................................................................4-8

Section 5

16-Bit Bus Operations

Data Transfer Operations............................................................................ 5-1

Read Operations ..................................................................................... 5-1

Write Cycle .............................................................................................. 5-4

Read-Modify-Write Cycle......................................................................... 5-7

CPU Space Cycle.................................................................................... 5-9

Bus Arbitration .......................................................................................... 5-11

Requesting The Bus .............................................................................. 5-14

Receiving The Bus Grant ...................................................................... 5-15

Acknowledgment of Mastership (3-Wire Arbitration Only)..................... 5-15

Bus Arbitration Control .............................................................................. 5-15

Bus Error and Halt Operation .................................................................... 5-23

Bus Error Operation .............................................................................. 5-24

Retrying The Bus Cycle......................................................................... 5-26

Halt Operation ....................................................................................... 5-27

Double Bus Fault ................................................................................... 5-28

Reset Operation ........................................................................................ 5-29

The Relationship of DTACK, BERR, and HALT ......................................... 5-30

Asynchronous Operation .......................................................................... 5-32

Synchronous Operation ............................................................................ 5-35

Section 6

Exception Processing

Privilege Modes............................................................................................ 6-1

Supervisor Mode ......................................................................................6-2

User Mode ................................................................................................ 6-2

Privilege Mode Changes ..........................................................................6-2

Reference Classification........................................................................... 6-3

Exception Processing................................................................................... 6-4

Exception Vectors .................................................................................... 6-4

Kinds Of Exceptions ................................................................................. 6-5

Multiple Exceptions................................................................................... 6-8

viii

M68000 USER’S MANUAL

MOTOROLA

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