TS87C52X2 ATMEL Corporation, TS87C52X2 Datasheet - Page 45

• Manufacturer Part Number: TS87C52X2
• Description: 8-bit Microcontroller 8 Kbytes Otp
• Manufacturer: ATMEL Corporation

External Data Memory Write
Cycle
Figure 19. External Data Memory Write Cycle
4184E–8051–09/02
PORT 0
PORT 2
PSEN
ALE
WR
OR SFR-P2
ADDRESS
Table 31. 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
T
T
LLAX
AVWL
Type
T
Max
Max
Max
Max
Max
Max
Max
Min
Min
Min
Min
Min
Min
Min
Min
Min
LLWL
Standard
ADDRESS A8-A15 OR SFR P2
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
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
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
T
WHLH
-V
15
15
23
15
35
50
20
20
20
10
10
10
10
0
8
0
T
TS8xCx2X2
WHQX
-L
25
25
30
25
45
65
30
30
30
20
20
15
20
20
0
0
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
45