T89C51RD2-3CSCM 查看數據表（PDF） - Atmel Corporation
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T89C51RD2-3CSCM Datasheet PDF : 104 Pages
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T89C51RD2
Table 50. AC Parameters for a Variable Clock
Symbol
TRLRH
TWLWH
TRLDV
TRHDX
TRHDZ
TLLDV
TAVDV
TLLWL
TLLWL
TAVWL
TQVWX
TQVWH
TWHQX
TRLAZ
TWHLH
TWHLH
Type
Min
Min
Max
Min
Max
Max
Max
Min
Max
Min
Min
Min
Min
Max
Min
Max
External Data Memory Write
Cycle
Standard Clock
6T-x
6T-x
5T-x
x
2T-x
8T-x
9T-x
3T-x
3T+x
4T-x
T-x
7T-x
T-x
x
T-x
T+x
ALE
X2 Clock
3T-x
3T-x
2.5 T - x
x
T-x
4T -x
4.5 T - x
1.5 T - x
1.5 T + x
2T-x
0.5 T - x
3.5 T - x
0.5 T - x
x
0.5 T - x
0.5 T + x
X parameter for - X parameter for -
M range
L range
20
20
20
20
25
25
0
0
20
20
40
40
60
60
25
25
25
25
25
25
15
15
15
15
10
10
0
0
15
15
15
15
TWHLH
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
PSEN
WR
PORT 0
PORT 2 ADDRESS
OR SFR-P2
TLLWL
TWLWH
TLLAX
A0-A7
TAVWL
TQVWX
TQVWH
DATA OUT
ADDRESS A8-A15 OR SFR P2
TWHQX
89
4243G–8051–05/03
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