Z80 Datasheet, PDF (9/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

Z80 CPU Peripherals
User Manual
ix
List of Figures
Counter/Timer Channels
Figure 1. CTC Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Figure 2. Channel Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Figure 3. Z80 16-Bit Pointer (Interrupt Starting Address) . . . . . . . . . .8
Figure 4. CTC Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Figure 5. Package Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Figure 6. 44-Pin Chip Carrier Pin Assignments . . . . . . . . . . . . . . . . .11
Figure 7. 44-Pin Quad Flat Pack Pin Assignments . . . . . . . . . . . . . .12
Figure 8. Mode 2 Interrupt Operation . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 9. CTC Write Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Figure 10. CTC Read Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Figure 11. CTC Counting and Timing . . . . . . . . . . . . . . . . . . . . . . . . .27
Figure 12. Interrupt Acknowledge Cycle . . . . . . . . . . . . . . . . . . . . . . .29
Figure 13. Return from Interrupt Cycle . . . . . . . . . . . . . . . . . . . . . . . .30
Figure 14. Daisy-Chain Interrupt Servicing . . . . . . . . . . . . . . . . . . . . .31
Direct Memory Access
Figure 15. Typical CPU I/O Sequence . . . . . . . . . . . . . . . . . . . . . . . . .34
Figure 16. Conceptual Comparison of Various I/O Transfer Methods 39
Figure 17. Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Figure 18. Class of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Figure 19. Basic Functions of the Z80 DMA . . . . . . . . . . . . . . . . . . . .49
Figure 20. Transfer/Search One Byte . . . . . . . . . . . . . . . . . . . . . . . . . .51
Figure 21. Byte Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Figure 22. Burst Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Figure 23. Continuous Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
List of Figures
UM008101-0601