TS80C51RA2 Atmel Corporation, TS80C51RA2 Datasheet - Page 66

• Manufacturer Part Number: TS80C51RA2
• Description: High Performance 8-bit Microcontroller
• Manufacturer: Atmel Corporation

External Data Memory Write
Cycle
Figure 26. External Data Memory Write Cycle
External Data Memory Read
Cycle
66
TS8xC51Rx2
PORT 0
PORT 2
PSEN
ALE
WR
OR SFR-P2
ADDRESS
Table 42. AC Parameters for a Variable Clock: derating formula
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
WHLH
WHLH
RLRH
RLDV
RHDX
RHDZ
AVDV
AVWL
LLDV
LLWL
LLWL
RLAZ
A0-A7
Type
T
Max
Max
Max
Max
Max
Max
Max
Min
Min
Min
Min
Min
Min
Min
Min
Min
T
LLAX
AVWL
T
LLWL
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
ADDRESS A8-A15 OR SFR P2
T
X2 Clock
QVWX
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
T
QVWH
T
DATA OUT
WLWH
-M
20
20
25
20
40
60
25
25
25
15
15
10
15
15
0
0
-V
15
15
23
15
35
50
20
20
20
10
10
10
10
0
8
0
T
WHLH
T
-L
25
25
30
25
45
65
30
30
30
20
20
15
20
20
0
0
WHQX
4188A–8051–10/02
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns