HD643303x Hitachi, HD643303x Datasheet - Page 127

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

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.
Read
access
Write
access
Note:
*
Arrows indicate time of sampling of the
ø
WAIT
Address bus
AS
RD
Data bus
WR
Data bus
pin
2
T
1
state, a wait state (T
Figure 6-5 Pin Wait Mode 0
T
WAIT
2
*
112
pin.
External address
W
Inserted by
) is inserted. If the WAIT pin remains low,
Write data
T
W
*
WAIT
T
signal
W
*
Read data
T
3