10
4235K–8051–05/08
AT89C51RD2/ED2
50
49
48
47
44
45
46
P4.5
P3.7/RD
XTAL2
XTAL1
P4.4
P3.6/WR
P4.3
N
IC
N
IC
P
3
.1
/T
x
D
P
3
.2
/I
N
T
0
P
3
.3
/I
N
T
1
P
3
.4
/T
0
P
3
.5
/T
1
3
7
3
8
3
9
4
0
4
1
4
2
4
3
AT89C51ED2
PLCC68
P
0
.4
/A
D
4
P
5
.4
P
5
.3
P
0
.5
/A
D
5
P
0
.6
/A
D
6
N
IC
P
0
.7
/A
D
7
E
A
N
IC
A
L
E
P
1
.6
/C
E
X
3
/S
C
K
P
1
.7
/C
E
X
4
/M
O
S
I
R
S
T
N
IC
N
IC
N
IC
P
3
.0
/R
x
D
N
IC
N
IC
P
1
.5
/C
E
X
2
/M
IS
O
60
59
58
57
56
55
54
53
51
52
10
11
12
13
14
15
16
17
19
18
2
7
2
8
2
9
3
0
3
1
3
2
3
4
3
5
3
6
9
8
7
6
5
3
2
1
6
8
P5.0
P2.4/A12
P2.3/A11
P4.7
P2.2/A10
P4.6
P2.0/A8
P2.1/A9
NIC
VSS
P5.5
P0.3/AD3
P0.2/AD2
P5.6
P0.1/AD1
P0.0/AD0
P5.7
VCC
NIC
P1.0/T2
4
P
S
E
N
IC
P
2
.7
/A
1
5
P
2
.6
/A
1
4
P
5
.2
P
5
.1
P
2
.5
/A
1
3
6
7
6
5
6
4
6
3
6
2
6
1
6
20
21
22
23
26
25
24
P4.0
P1.1/T2EX/SS
P1.2/ECI
P1.3/CEX0
P4.1
P1.4/CEX1
P4.2
NIC: Not Internaly Connected
5
4
5
3
5
2
5
1
5
0
4
9
AT89C51ED2
VQFP64
P
0
.4
/A
D
4
P
5
.4
P
5
.3
P
0
.5
/A
D
5
P
0
.6
/A
D
6
P
0
.7
/A
D
7
E
A
N
IC
A
L
E
P
S
E
N
#
P
1
.5
/C
E
X
2
/M
IS
O
P
1
.6
/C
E
X
3
/S
C
K
P
1
.7
/A
1
7
/C
E
X
4
/M
O
S
I
R
S
T
N
IC
N
IC
N
IC
P
3
.0
/R
x
D
N
IC
P
4
.2
48
47
46
45
44
43
42
41
39
40
1
2
3
4
5
6
7
8
10
9
1
7
1
8
1
9
2
0
2
1
2
3
2
4
2
5
2
6
4
6
3
6
2
6
1
6
0
5
9
5
8
5
7
5
6
5
P2.4/A12
P2.3/A11
P4.7
P2.2/A10
P2.1/A9
NIC
P4.6
P2.0/A8
VSS
P4.5
P5.5
P0.3/AD3
P0.2/AD2
P5.6
P0.1/AD1
P0.0/AD0
P5.7
VCC
NIC
P1.0/T2
11
12
13
16
15
14
P4.0
P1.1/T2EX/SS
P1.2/ECI
P1.3/CEX0
P4.1
P1.4/CEX1
38
37
36
33
34
35
P3.7/RD
XTAL2
XTAL1
P4.4
P3.6/WR
P4.3
N
IC
P
3
.1
/T
x
D
P
3
.2
/I
N
T
0
P
3
.3
/I
N
T
1
P
3
.4
/T
0
P
3
.5
/T
1
2
7
2
8
2
9
3
0
3
1
3
2
P
2
.7
/A
1
5
P
2
.6
/A
1
4
P
5
.2
P
5
.1
P
2
.5
/A
1
3
P
5
.0