Zilog Z80180 Bedienungsanleitung Seite 34

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Z8018x
Family MPU User Manual
UM005003-0703
19
The Op Code on the data bus is latched at the rising edge of T3 and the
bus cycle terminates at the end of T3.
Figure 9. Op Code Fetch (without Wait State) Timing Diagram
Figure 10 illustrates the insertion of Wait States (TW) into the Op Code
fetch cycle. Wait States (TW) are controlled by the external WAIT
input
combined with an on-chip programmable Wait State generator.
At the falling edge of T2 the combined WAIT
input is sampled. If WAIT
input is asserted Low, a Wait State (TW) is inserted. The address bus,
MREQ
, RD and M1 are held stable during Wait States. When WAIT is
sampled inactive High at the falling edge of TW, the bus cycle enters T3
and completes at the end of T3.
T1 T3 T1 T2T2
Phi
A0
A19
D0
D7
M1
MREQ
RD
WAIT
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