Z80 Datasheet, PDF (15/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

Z80 CPU Peripherals
User Manual
xv
List of Tables
Counter/Timer Channels
Table 1.
Table 2.
Table 3.
Channel Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Channel Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Interrupt Vector Register . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Table 4.
Table 5.
Table 6.
Table 7.
Channel Select Truth Table . . . . . . . . . . . . . . . . . . . . . . . . .13
Channel Control Register . . . . . . . . . . . . . . . . . . . . . . . . . .19
Time Constant Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Interrupt Vector Register . . . . . . . . . . . . . . . . . . . . . . . . . .23
Direct Memory Access
Table 8. Maximum Transfer and Search Speeds (Burst and Continuous
Modes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Table 9. Reduction in Z80 CPU Throughput per Kbaud
(Byte Mode Transfers) . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Table 10. Events and Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Table 11. Contents of Counters After DMA Stops Because of End-of-
Block (Transfer Operations) . . . . . . . . . . . . . . . . . . . . . . . .76
Table 12. Contents of Counters After DMA Stops Due to Byte Match
(Search or Transfer/Search Operations) . . . . . . . . . . . . . . .76
Table 13. DMA Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Table 14. Reinitialize Status Byte . . . . . . . . . . . . . . . . . . . . . . . . . . .110
Table 15. Control Byte Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
Table 16.
Table 17.
Table 18.
Sample DMA Program . . . . . . . . . . . . . . . . . . . . . . . . . . .126
Receive Event Sequence . . . . . . . . . . . . . . . . . . . . . . . . . .139
Transmit Event Sequence . . . . . . . . . . . . . . . . . . . . . . . . .139
List of Tables
UM008101-0601