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Z80 Datasheet(PDF) 42 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 42 Page - Zilog, Inc. |
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42 / 330 page  <%27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Counter/Timer Channels CTC TIMING Overview This section describes the timing relationships of the relevant CTC pins for the following types of operation: • Writing a word to the CTC • Reading a word from the CTC • Counting and timing A timing diagram, Figure 12, relating to interrupt servicing is found in “Interrupt Acknowledge Cycle” on page 28. CTC Write Cycle Figure 9 illustrates the timing associated with the CTC Write cycle. This sequence is applicable to loading a channel control word, an interrupt vector, or a time constant data word. In the sequence shown, during clock cycle T1, the Z80 CPU prepares for the Write cycle with a false (High) signal at CTC input pin RD (Read). Because the CTC has no separate Write signal input, it generates its own input internally from the false RD input. During clock cycle T2, the Z80 CPU initiates the Write cycle with true (Low) signals at CTC input pins IORQ (I/O Request) and CE (Chip Enable). (See Note below.) A 2-bit binary code appears at CTC inputs CS1 and CS0 (Channel Select 1 and 0), specifying which of the four CTC channels is being written to. At this time, a channel control, interrupt vector, or time constant data word may be loaded to the appropriate CTC internal register in synchronization with the rising edge beginning clock cycle T3. M1 must be false to distinguish the cycle from an interrupt acknowledge. Note: |
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