W78E365/W78E365A
9. TYPICAL APPLICATION CIRCUIT
9.1 External Program Memory and Crystal
V
DD
AD0
38 AD1
37 AD2
31
19
39
AD0
AD1
AD2
AD3
3
4
7
8
11
12
13
15
16
17
18
19
AD0
2
5
A0
A1
A2
A3
A4
A5
A0
A1
A2
A3
A4
A5
A6
A7
A8 25
A9 24
A10 21
A11
A12
A13 26
10
9
D0
D1
D2
D3
D4
D5
D6
D7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
A0
O0
O1
O2
O3
O4
O5
O6
O7
EA
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A1
6
8
A2
XTAL1
AD3
AD4
AD5
36
35
34
9
12
15
16 A6
19
7
6
10 u
A3
AD4 13
AD5 14
17
AD6
AD7 18
A4
R
18
9
5
XTAL2
RST
A5
CRYSTAL
33 AD6
32 AD7
4
A6
3
A7
A7
8.2 K
A8
1
GND
21
22
23
24
25
26
27
28
A8
A9
OC
G
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
A9
C1
C2
11
A10
A11
A12
A13
A14
A15
INT0
12
13
14
15
A10
A11
A12
A13
A14
A15
23
2
INT1
T0
T1
74LS373
A14
A15
27
1
1
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
20
22
GND
2
3
4
5
6
7
8
CE
OE
RD
17
16
29
30
11
10
WR
27512
PSEN
ALE
TXD
RXD
W78E365/W78E365A
Figure A
CRYSTAL
6 MHz
C1
47P
30P
15P
10P
5P
C2
R
47P
30P
15P
10P
5P
-
-
-
16 MHz
24 MHz
32 MHz
40 MHz
6.8K
4.7K
Above table shows the reference values for crystal applications.
Notes:
1. C1, C2, R components refer to Figure A
2. Crystal layout must get close to XTAL1 and XTAL2 pins on user's application board.
Typical Application Circuit, continued
- 34 -
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