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Pin Wait Mode 0: The wait state controller is disabled. Wait states can only be inserted by WAIT
pin control. During access to an external three-state-access area, if the WAIT pin is low at the fall
of the system clock (ø) in the T
wait states continue to be inserted until the WAIT signal goes high. Figure 6-5 shows the timing.
ø
WAIT
pin
Address bus
AS
RD
Read
access
Data bus
WR
Write
access
Data bus
Note: * Arrows indicate time of sampling of the WAIT pin.
122
state, a wait state (T
2
T
T
1
2
*
Figure 6-5 Pin Wait Mode 0
) is inserted. If the WAIT pin remains low,
W
Inserted by
WAIT
signal
T
T
W
W
*
External address
Write data
T
3
*
Read data
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