W78C438C
- 14 -
TYPICAL APPLICATION CIRCUITS
Using 128K
×
8 bit External EPROM (W27E010)
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
18
19
20
21
22
23
24
25
26
27
28
29
30
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
1
2
3
4
8
9
7
8
9
0
1
2
3
4
5
6
7
8
9
0
6 5
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
9
9
1
0
P1.5
AP5.7
P
2
.
2
P2.3
P2.4
P0.5
P0.7
P0.6
AP5.6
AP5.5
AP5.4
AP5.3
AP5.2
AP5.1
AP5.0
P2.5
P2.6
P2.7
PSEN
ALE
EA
A
P
6
.
7
0
1 2
3 3 3
3 4 5
3 3 3
6
3
7 8
3 3
9 0
4 4
1 2 3 4 5 6 7 8 9
4 4 4 4 4 4 4 4 5
A
X
T
L
1
X
T
A
L
2
5 V
8.2 K
10 U
C2
C1
R
P1.6
P1.7
RESET
P8.1
P8.2
P8.3
P8.4
P8.5
P3.0, RXD
P3.1, TXD
P3.3, INT1
P3.4, T0
INT3
P3.2, INT0
P3.5, T1
P3.6, WR
INT2
P8.0
P8.6
P8.7
A
P
7
.
3
,
/
C
S
3
A
P
7
.
2
,
/
C
S
2
A
P
7
.
1
,
/
C
S
1
A
P
7
.
0
,
/
C
S
0
A
P
6
.
6
A
P
6
.
5
A
P
6
.
4
A
P
6
.
3
A
P
6
.
2
P
3
.
7
,
/
R
D
A
P
6
.
0
A
P
6
.
1
P
2
.
1
P
2
.
0
P0.4
P
1
.
4
P
1
.
3
P
1
.
2
P
1
.
1
P
1
.
0
D
P
4
.
7
D
P
4
.
6
D
P
4
.
5
D
P
4
.
4
D
P
4
.
3
D
P
4
.
2
D
P
4
.
1
D
P
4
.
0
P
0
.
0
P
0
.
1
P
0
.
2
P
0
.
3
VDD
VDD
VSS
W78C438C
A0
12
A1
11
A2
10
A3
9
A4
8
A5
7
A6
6
A7
5
A8
27
A9
26
A10
23
A11
25
A12
4
A13
28
A14
29
A15
3
CE
OE
O0
13
O1
14
O2
15
O3
17
O4
18
O5
19
O6
20
O7
21
GND
A16
Vpp
Vcc
PGM
Vss
2
22
24
1
32
31
16
V
D
D
N
C
N
C
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
W27E010
V
S
S
N
C
Figure A
