t89c51rd2-slscl ATMEL Corporation, t89c51rd2-slscl Datasheet - Page 89

• Manufacturer Part Number: t89c51rd2-slscl
• Description: 0 To 40 Mhz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL Corporation

Table 50. AC Parameters for a Variable Clock
External Data Memory Write
Cycle
4243G–8051–05/03
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
WHLH
WHLH
RLRH
RHDX
RHDZ
AVDV
AVWL
RLDV
LLDV
LLWL
LLWL
RLAZ
PORT 0
PORT 2
PSEN
ALE
WR
Type
Max
Max
Max
Max
Max
Max
Max
Min
Min
Min
Min
Min
Min
Min
Min
Min
OR SFR-P2
ADDRESS
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
20
20
25
20
40
60
25
25
25
15
15
10
15
15
0
0
T
WHLH
T89C51RD2
T
WHQX
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
89