Rainbow Electronics W78C438C - Manual (Page 14)

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
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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