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Z80 CPU Peripherals

User Manual

UM008101-0601

Table of Contents

Direct Memory Access

DMA Overview .........................................33

CPU Data Transfers ...................................33

DMA Data Transfers ..................................35

DMA Characteristics ..................................37

DMA Functional Description ...............................43

Features .............................................43

Overview ............................................44

Programming ........................................45

ClassesofOperation ...................................46

ModesofOperation ...................................49

Transfer Speed .......................................56

AddressGeneration ....................................57

Byte Matching (Searching) ..............................58

Interrupts ............................................59

Auto Restart .........................................60

Pulse Generation ......................................60

Variable Cycle .......................................60

Events and Actions ....................................61

Pin Description ..........................................62

Internal Structure ........................................71

General Organization ..................................71

Control And Status Registers ............................72

Addressand Byte Counting .............................75

BusControl ..........................................77

Interrupts ............................................79

Programming ...........................................89

Overview ............................................89

Write Registers .......................................91

Write Register 0 Group .................................92

Write Register 1 Group .................................95

Write Register 2 Group .................................97

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