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30 PRELIMINARY
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Figure 16. External Bus Cycle: Data Write (Page Mode)
Table 13. Real-time Wait AC Timing
Symbol Parameter Min Max Units
T
CLYV
Wait Clock Low to Wait Set-up 0 T
OSC
– 20 ns
T
CLYX
Wait Hold after Wait Clock Low (2W)T
OSC
+ 5 (1+2W)T
OSC
– 20 ns
T
RLYV
PSEN#/RD# Low to Wait Set-up 0 T
OSC
– 20 ns
T
RLYX
Wait Hold after PSEN#/RD# Low (2W)T
OSC
+ 5 (1+2W)T
OSC
– 20 ns
T
WLYV
WR# Low to Wait Set-up 0 T
OSC
– 20 ns
T
WLYX
Wait Hold after WR# Low (2W)T
OSC
+ 5 (1+2W)T
OSC
– 20 ns
A8-A15
WCLK
ALE
WR#
T
WLYV
WAIT#
P2
P0
A5003-01
State 1 State 2 State 3 State 4
T
CLYX
min
T
CLYV
D0-D7 stretched
A0-A7 stretched
WR# stretched
T
WLYX
max
T
WLYX
min
T
CLYX
max