
115
AT89C51RB2/RC2
4180E–8051–10/06
External Data Memory Write
Cycle
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
25
ns
T
WLWH
Min
6 T - x
3 T - x
25
ns
T
RLDV
Max
5 T - x
2.5 T - x
30
ns
T
RHDX
Min
x
0
ns
T
RHDZ
Max
2 T - x
T - x
25
ns
T
LLDV
Max
8 T - x
4T -x
45
ns
T
AVDV
Max
9 T - x
4.5 T - x
65
ns
T
LLWL
Min
3 T - x
1.5 T - x
30
ns
T
LLWL
Max
3 T + x
1.5 T + x
30
ns
T
AVWL
Min
4 T - x
2 T - x
30
ns
T
QVWX
Min
T - x
0.5 T - x
20
ns
T
QVWH
Min
7 T - x
3.5 T - x
20
ns
T
WHQX
Min
T - x
0.5 T - x
15
ns
T
RLAZ
Max
x
0
ns
T
WHLH
Min
T - x
0.5 T - x
20
ns
T
WHLH
Max
T + x
0.5 T + x
20
ns
TQVWH
TLLAX
ALE
PSEN
WR
PORT 0
PORT 2
A0-A7
DATA OUT
ADDRESS
OR SFR-P2
TAVWL
T
LLWL
TQVWX
ADDRESS A8-A15 OR SFR P2
T
WHQX
T
WHLH
TWLWH