Preliminary W78E51B
PIN CONFIGURATIONS
40-Pin DIP (W78E51B)
1
VDD
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
P1.0
2
P0.0, AD0
P0.1, AD1
P0.2, AD2
P0.3, AD3
P0.4, AD4
P0.5, AD5
P0.6, AD6
P0.7, AD7
P1.1
P1.2
3
4
P1.3
5
P1.4
6
P1.5
7
P1.6
8
P1.7
9
RST
10
11
12
13
14
15
16
17
18
19
20
RXD, P3.0
TXD, P3.1
EA
ALE
INT0, P3.2
PSEN
P2.7, A15
INT1, P3.3
T0, P3.4
P2.6, A14
P2.5, A13
P2.4, A12
P2.3, A11
P2.2, A10
P2.1, A9
T1, P3.5
WR, P3.6
RD, P3.7
XTAL2
XTAL1
VSS
P2.0, A8
44-Pin PLCC (W78E51BP)
44-Pin QFP (W78E51BF)
/
I
N
T
3
,
/
I
N
T
3
,
A
D
3
,
A
D
0
,
A
D
1
,
A
D
2
,
A
D
1
,
A
D
3
,
A
D
0
,
A
D
2
,
P
1
.
P
1
.
P
0
.
P
1
.
P
1
.
P
1
.
P
0
.
P
0
.
P
0
.
P
4
.
P
1
.
P
1
.
P
1
.
P
1
.
P
1
.
P
0
.
P
0
.
P
0
.
P
0
.
P
4
.
V
D
D
V
D
D
3
4
3
2
1
0
1
2
0
2
3
4
3
2
1
0
1
2
2
0
34
33
43 42 41 40 39 38 37 36
44
35
40
39
38
6
5
4
3
2
1 44 43 42
41
P0.4, AD4
P0.5, AD5
P0.6, AD6
P0.7, AD7
1
2
7
8
9
P1.5
P1.6
P1.7
RST
P0.4, AD4
P0.5, AD5
P0.6, AD6
P0.7, AD7
P1.5
P1.6
P1.7
32
31
30
29
28
27
26
25
3
4
5
37
36
35
34
33
32
31
10
11
12
13
14
15
RST
RXD, P3.0
RXD, P3.0
EA
EA
P4.1
6
7
8
9
INT2, P4.3
TXD, P3.1
P4.1
ALE
INT2, P4.3
TXD, P3.1
ALE
INT0, P3.2
INT1, P3.3
T0, P3.4
INT0, P3.2
INT1, P3.3
T0, P3.4
PSEN
P2.7, A15
PSEN
P2.7, A15
P2.6, A14
10
11
24
23
P2.6, A14
P2.5, A13
16
17
30
29
T1, P3.5
P2.5, A13
T1, P3.5
12 13 14 15 16 17 18 19 20 21 22
18 19 20 21 22 23 24 25 26 27 28
P
3
.
P
3
.
X
T
A
L
2
X
T
A
L
1
V
S
S
P
2
.
P
2
.
P
2
.
P
2
.
P
2
.
P
4
.
P
3
.
P
3
.
X
T
A
L
2
X
T
A
L
1
V
S
S
P
2
.
P
2
.
P
2
.
P
2
.
P
2
.
P
4
.
6
,
7
,
0
,
1
,
3
,
4
,
2
,
0
6
,
7
,
0
,
1
,
3
,
4
,
2
,
0
/
/
A
8
A
9
A
1
1
A
1
2
A
1
0
/
/
A
8
A
9
A
1
1
A
1
2
A
1
0
W R
W R
R
D
R
D
- 2 -
WINBOND [ WINBOND ]
