TS83C51RC2_14 Datasheet, PDF (67/86 Pages) ATMEL Corporation – extra 8-bit I/O ports available on RD2 with high pin count packages

AT/TS8xC51Rx2
Table 11-9. AC Parameters for a Variable Clock: derating formula
Standard
Symbol
Type
Clock
X2 Clock
-M
-V
-L
T_RLRH
Min
6T-x
3T-x
20
15
25
T_WLWH
Min
6T-x
3T-x
20
15
25
T_RLDV
Max
5T-x
2.5 T - x
25
23
30
T_RHDX
Min
x
x
0
0
0
T_RHDZ
Max
2T-x
T-x
20
15
25
T_LLDV
Max
8T-x
4T -x
40
35
45
T_AVDV
Max
9T-x
4.5 T - x
60
50
65
T_LLWL
Min
3T-x
1.5 T - x
25
20
30
T_LLWL
Max
3T+x
1.5 T + x
25
20
30
T_AVWL
Min
4T-x
2T-x
25
20
30
T_QVWX
Min
T-x
0.5 T - x
15
10
20
T_QVWH
Min
7T-x
3.5 T - x
15
10
20
T_WHQX
Min
T-x
0.5 T - x
10
8
15
T_RLAZ
Max
x
x
0
0
0
T_WHLH
Min
T-x
0.5 T - x
15
10
20
T_WHLH
Max
T+x
0.5 T + x
15
10
20
11.5.5 External Data Memory Write Cycle
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Figure 11-7. External Data Memory Write Cycle
ALE
T_WHLH
PSEN
WR
PORT 0
PORT 2
ADDRESS
OR SFR-P2
T_LLWL
T_WLWH
T_LLAX
A0-A7
T_AVWL
T_QVWX
T_QVWH
DATA OUT
ADDRESS A8-A15 OR SFR P2
T_WHQX
11.5.6 External Data Memory Read Cycle
67
4188F–8051–01/08