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Semiconductor
MSM80C31F/80C51F
PIN CONFIGURATION (TOP VIEW)
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
V
SS
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RESET
RXD/P3.0
TXD/P3.1
INT0
/P3.2
INT1
/P3.3
T0/P3.4
T1/P3.5
WR
/P3.6
RD
/P3.7
XTAL2
XTAL1
P2.0
V
CC
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P2.3
P2.2
P2.1
21
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
40-Pin Plastic DIP