external data memory write cycle, Table 43, Table 43. ac parameters for a variable clock – Rainbow Electronics T89C51RD2 User Manual
Page 80
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Rev. F - 15 February, 2001
80
T89C51RD2
9.5.5. External Data Memory Write Cycle
Table 43. AC Parameters for a Variable Clock
Symbol
Type
Standard
Clock
X2 Clock
X parameter
for -M range
X parameter
for -L range
Units
T
RLRH
Min
6 T - x
3 T - x
20
20
ns
T
WLWH
Min
6 T - x
3 T - x
20
20
ns
T
RLDV
Max
5 T - x
2.5 T - x
25
25
ns
T
RHDX
Min
x
x
0
0
ns
T
RHDZ
Max
2 T - x
T - x
20
20
ns
T
LLDV
Max
8 T - x
4T -x
40
40
ns
T
AVDV
Max
9 T - x
4.5 T - x
60
60
ns
T
LLWL
Min
3 T - x
1.5 T - x
25
25
ns
T
LLWL
Max
3 T + x
1.5 T + x
25
25
ns
T
AVWL
Min
4 T - x
2 T - x
25
25
ns
T
QVWX
Min
T - x
0.5 T - x
15
15
ns
T
QVWH
Min
7 T - x
3.5 T - x
15
15
ns
T
WHQX
Min
T - x
0.5 T - x
10
10
ns
T
RLAZ
Max
x
x
0
0
ns
T
WHLH
Min
T - x
0.5 T - x
15
15
ns
T
WHLH
Max
T + x
0.5 T + x
15
15
ns
T
QVWH
T
LLAX
ALE
PSEN
WR
PORT 0
PORT 2
A0-A7
DATA OUT
ADDRESS
OR SFR-P2
T
AVWL
T
LLWL
T
QVWX
ADDRESS A8-A15 OR SFR P2
T
WHQX
T
WHLH
T
WLWH
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