T89C51RD2-3CBC-L ATMEL [ATMEL Corporation], T89C51RD2-3CBC-L Datasheet - Page 80

• Manufacturer Part Number: T89C51RD2-3CBC-L
• Description: 0 to 40MHz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

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