W78IRD2 Datasheet, PDF (66/76 Pages) Winbond – 8-BIT MICROCONTROLLER

W78IRD2
20. TYPICAL APPLICATION CIRCUITS
20.1 External Program Memory and Crystal
V _DD
8.2 K
10 u
CRYSTAL
C1
C2
31
19
R ₁₈
EA
XTAL1
XTAL2
9 RST
12 ^INT0
13 INT1
14 _T0
15 _T1
1 P1.0
2 P1.1
3 P1.2
4 P1.3
5 P1.4
6 P1.5
7 P1.6
8 P1.7
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
RD
WR
PSEN
ALE
TXD
RXD
39 AD0
38 AD1
37 AD2
36 AD3
35 AD4
34 AD5
33 AD6
32 AD7
21 A8
22 A9
23 A10
24 A11
25 _A12
26 A13
27 A14
28 A15
17
16
29
30
11
10
AD0 3 _D0
AD1 4 D1
AD2 7 D2
AD3 8 D3
AD4 13 D4
AD5 14 D5
AD6 17 D6
AD7 18 D7
Q0 2 A0
Q1 5 A1
Q2 6 A2
Q3 9 A3
Q4 12 A4
Q5 15 A5
Q6 16 A6
Q7 19 A7
GND 1 _OC
11 G
74LS373
A0 10
A1 9
A2 8
A3 7
A4 6
A5 5
A6 4
A7 3
A8 25
A9 24
A10 21
A11 23
A12 2
A13 26
A14 27
A15 1
GND 20
22
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
CE
OE
27512
O0
O1
11
12
AD0
AD1
O2 ^{13 AD2}
O3
O4
O5
O6
15
16
17
18
AD3
AD4
AD5
AD6
O7 ^{19 AD7}
Figure 20-1
CRYSTAL
C1
C2
R
6 MHz
47P
47P
-
16 MHz
30P
30P
-
20 MHz
15P
15P
-
Above table shows the reference values for crystal applications.
Notes:
1. For C1, C2 and R components, see Figure 20-1
2. The crystal should be as close as possible to the XTAL1 and XTAL2 pins on the application board.
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