AT89C51RD2-RDTIM Atmel, AT89C51RD2-RDTIM Datasheet - Page 121

• Manufacturer Part Number: AT89C51RD2-RDTIM
• Description: MCU 8-Bit AT89 80C51 CISC 64KB Flash 3.3V/5V 64-Pin VQFP Tray
• Manufacturer: Atmel

25.3.5
4235J–8051–01/08
External Data Memory Write Cycle
PORT 0
PORT 2
PSEN
ALE
WR
OR SFR-P2
ADDRESS
Table 25-6.
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
RHDX
RHDZ
AVWL
WHLH
WHLH
RLRH
RLDV
AVDV
LLWL
LLWL
RLAZ
LLDV
AC Parameters for a Variable Clock
A0-A7
T
Type
T
Max
Max
Max
Max
Max
Max
Max
LLAX
Min
Min
Min
Min
Min
Min
Min
Min
Min
AVWL
T
LLWL
Standard
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
Clock
T + x
T - x
T - x
T - x
ADDRESS A8-A15 OR SFR P2
x
x
T
QVWX
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
T
QVWH
x
x
T
DATA OUT
WLWH
AT89C51RD2/ED2
X parameter for
T
-M range
WHLH
25
25
30
25
45
65
30
30
30
20
20
15
20
20
0
0
T
WHQX
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
121