
51
AT/TSC8x251G2D
4135F–8051–11/06
Timings
Table 42.
Real-Time Synchronous Wait AC Timings; VDD = 2.7 to 5.5 V, TA = -40 to
85
°C
Waveforms
Figure 14.
Real-time Synchronous Wait State: Code Fetch/Data Read
Figure 15.
Real-time Synchronous Wait State: Data Write
Symbol
Parameter
Min
Max
Unit
TCLYV
Wait Clock Low to Wait Set-up
0
TOSC - 20
ns
TCLYX
Wait Hold after Wait Clock Low
2WTOSC + 5
(1+2W)TOSC - 20
ns
TRLYV
PSEN#/RD# Low to Wait Set-up
0
TOSC - 20
ns
TRLYX
Wait Hold after PSEN#/RD# Low
2WTOSC + 5
(1+2W)TOSC - 20
ns
TWLYV
WR# Low to Wait Set-up
0
TOSC - 20
ns
TWLYX
Wait Hold after WR# Low
2WTOSC + 5
(1+2W)TOSC - 20
ns
State 1
State 2
State 3
State 1 (next cycle)
TRLYXmax
TRLYXmin
TRLYV
TCLYV
TCLYXmax
P2
RD#/PSEN#
ALE
WCLK
P0
WAIT#
TCLYXmin
RD#/PSEN# stretched
A15:8
A7:0
D7:0
stretched
A15:8
stretched
A7:0
State 1
State 2
State 3
State 1 (next cycle)
TWLYXmax
TWLYXmin
TWLYV
TCLYV
TCLYXmax
P2
RD#/PSEN#
ALE
WCLK
P0
WAIT#
TCLYXmin
WR# stretched
A7:0
D7:0
stretched
A15:8
stretched