Z80 datasheet(3/330 Pages) ZILOG

3 / 330 page

Z80 CPU Peripherals

User Manual

UM008101-0601

Table of Contents

iii

Table of Contents

Counter/Timer Channels

CTCFeatures ............................................1

CTCGeneral Description ................................1

CTCArchitecture .........................................2

Overview .............................................2

Structure ofChannel Logic ...............................3

Interrupt Control Logic ..................................7

CTCPin Description .......................................9

Pin Functions .........................................9

CTCOperating Modes ....................................16

Overview ............................................16

CTC Counter Mode ...................................16

CTCTimer Mode .....................................17

CTC Programming .......................................18

Overview ............................................18

Loading The Channel Control Register ....................19

Loading The Time Constant Register ......................22

Loading The Interrupt Vector Register .....................22

CTC Timing ............................................24

Overview ............................................24

CTCWrite Cycle .....................................24

CTCRead Cycle ......................................25

CTCCounting and Timing ..............................26

CTCInterrupt Servicing ...................................27

Overview ............................................27

Interrupt Acknowledge Cycle ............................28

Return from Interrupt Cycle .............................29

Daisy-Chain Interrupt Servicing ..........................30

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