Rainbow Electronics W78C51D - Manual (Page 2)

Preliminary W78C51D
- 2 -
PIN CONFIGURATIONS
VDD 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
39
40
34
35
36
37
38
30
31
32
33
26
27
28
29
21
22
23
24
25
P0.0, AD0
P0.1, AD1
P0.2, AD2
P0.3, AD3
P0.4, AD4
P0.5, AD5
P0.6, AD6
P0.7, AD7
EA
ALE
PSEN
P2.5, A13
P2.6, A14
P2.7, A15
P2.0, A8
P2.1, A9
P2.2, A10
P2.3, A11
P2.4, A12
P1.0
40-Pin DIP (W78C51D)
P1.2
P1.3
P1.4
P1.5
P1.6
RXD, P3.0
TXD, P3.1
P1.7
RST
INT0, P3.2
INT1, P3.3
T0, P3.4
T1, P3.5
WR, P3.6
RD, P3.7
XTAL1
XTAL2
VSS
P1.1
44-Pin PLCC (W78C51DP) 44-Pin QFP (W78C51DF)
40 2 1 44 43 42 41 6 5 4 3
39
38
37
36
35
34
33
32
31
30
29
28 27 26 25 24 23 22 21 20 19 18
17
10
9
8
7
14
13
12
11
16
15
P1.5
P1.6
P1.7
RST
RXD, P3.0
TXD, P3.1
INT0, P3.2
INT1, P3.3
T0, P3.4
T1, P3.5
A
D
3
,
P
0
.
3
P
1
.
0 P
1
.
2
V
D
D
A
D
2
,
P
0
.
2 A
D
1
,
P
0
.
1 A
D
0
,
P
0
.
0
P
1
.
1 P
1
.
3 P
1
.
4
X
T
A
L
1 V
S
S P
2
.
4
,
A
1
2 P
2
.
3
,
A
1
1 P
2
.
2
,
A
1
0 P
2
.
1
,
A
9 P
2
.
0
,
A
8 X
T
A
L
2 P
3
.
7
,
/
R
D P
3
.
6
,
/
W
R
P0.4, AD4
P0.5, AD5
P0.6, AD6
P0.7, AD7
EA
ALE
PSEN
P2.7, A15
P2.6, A14
P2.5, A13
P4.1
P
4
.
0
INT2, P4.3
/
I
N
T
3
,
P
4
.
2
34 40 39 38 37 36 35 44 43 42 41
33
32
31
30
29
28
27
26
25
24
23
P0.4, AD4
P0.5, AD5
P0.6, AD6
P0.7, AD7
EA
ALE
PSEN
P2.7, A15
P2.6, A14
P2.5, A13
22 21 20 19 18 17 16 15 14 13 12
11
4
3
2
1
8
7
6
5
10
9
P1.5
P1.6
P1.7
RST
RXD, P3.0
TXD, P3.1
INT0, P3.2
INT1, P3.3
T0, P3.4
T1, P3.5
X
T
A
L
1 V
S
S P
2
.
4
,
A
1
2 P
2
.
3
,
A
1
1 P
2
.
2
,
A
1
0 P
2
.
1
,
A
9 P
2
.
0
,
A
8 X
T
A
L
2 P
3
.
7
,
/
R
D P
3
.
6
,
/
W
R
A
D
3
,
P
0
.
3
P
1
.
0 P
1
.
2
V
D
D
A
D
2
,
P
0
.
2 A
D
1
,
P
0
.
1 A
D
0
,
P
0
.
0
P
1
.
1 P
1
.
3 P
1
.
4
P
4
.
0
/
I
N
T
3
,
P
4
.
2
P4.1 INT2, P4.3