W78E516B
TYPICAL APPLICATION CIRCUIT
Expanded External Program Memory and Crystal
V
DD
AD0
38 AD1
37 AD2
31
19
39
AD0
AD1
AD2
AD3
AD4
AD5
3
4
11
12
13
15
16
17
18
19
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A0
A1
A2
A3
A4
A5
A6
A7
A8 25
A9 24
A10 21
A11 23
2
5
6
9
A0
A1
A2
A3
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
A1
7
8
A2
XTAL1
AD3
AD4
AD5
36
35
34
8
13
14
7
10 u
A3
12 A4
15 A5
6
A4
R
18
9
5
XTAL2
RST
A5
CRYSTAL
33 AD6
32 AD7
A6
A7
AD6 17
AD7 18
16
19
4
A6
3
A7
8.2 K
A8
A9
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
C1
C2
11
A10
A11
A12
A13
A14
A15
INT0
12
13
14
15
A10
A11
A12
A13
A14
A15
2
A12
INT1
T0
T1
74LS373
A13 26
A14 27
A15
1
1
2
3
4
5
6
7
8
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
20
22
GND
CE
OE
RD
17
16
29
30
11
10
WR
27512
PSEN
ALE
TXD
RXD
W78E516B
Figure A
CRYSTAL
6 MHz
C1
47P
C2
47P
30P
10P
10P
5P
R
-
16 MHz
24 MHz
32 MHz
40 MHz
30P
15P
10P
5P
-
-
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.
Publication Release Date: February 2000
Revision A3
- 19 -
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