Mostek z80 - Page 50

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5. The fifth option allows the user to specify the History clock source. To
update the history clock source one or more of the following digits
corresponding to the desired history clock may be entered. If more than one
digit is entered, the signals are "ORed" together. Spaces or commas between
the digits are optional.
o - MEMORY READS
1 - MEMORY WRrrES
2 - MEMORY REFRESHES
3 - PORT REAIE
4 - PORT WRITES
5 - POSITIVE ElXiE OF PROBE A8
6 - NEGATIVE EDGE OF PROBE A8
6. The sixth option allows the user to specify the History clock enable
signal. To update the History clock enable, one of the following numbers
corresponding to the desired history clock enable signal is entered. An
optional second number may be entered to further qualify the History clock
depending on the state of probe B8 during the previous cycle.
o - ALL CYCLES I DMA AND CPU
•
1 - DMA CYCLES ONLY
2 - CPU CYCLES ONLY
3 - ONLY IF PROBE A7 IS LOW
4 - OOLY IF PROBE A7 IS HIGH
6 - ONLY IS rrHE TRIGGER WORD MATCHES
x
,
8 - THE ABOVE ONLY IF PROBE B8 WAS LCJd
x,9 - THE ABOVE ONLY IS PROBE S8 WAS HIGH