Z80 datasheet(5/330 Pages) ZILOG

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Z80 CPU Peripherals

User Manual

Table of Contents

UM008101-0601

Direct Memory Access (continued)

Write Register 3 Group .................................97

Write Register 4 Group .................................99

Write Register 5 Group ................................102

Write Register 6 Group ................................104

Read Registers ......................................113

Review of Programming Sequences ......................117

Applications ...........................................128

Z80 DMA and CPU ..................................128

Z80 DMA and Z80 SIO Example ........................138

Using The Z80 DMA With OtherProcessors ...............142

Performance Limitations ..................................148

BusContention ......................................148

Control Overhead ....................................149

Timing ................................................150

The CPU As Bus Master ...............................150

The DMA As BusMaster ..............................152

Write Register Bit Functions ...........................170

Read Register Bit Functions ............................174

Parallel Input/Output

Overview ..............................................175

Features ...............................................175

PIO Architecture ........................................176

Overview ...........................................176

Pin Description .........................................180

Programming the PIO ....................................187

Reset ..............................................187

Loading The Interrupt Vector ...........................188

Selecting An Operating Mode ..........................189

Setting The Interrupt Control Word ......................191

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