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