W79E201 Datasheet, PDF (77/87 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E201
24. TYPICAL APPLICATION CIRCUITS
Expanded External Program Memory and Crystal
V_CC
10 u
8.2 K
C1
V_CC
CRYSTAL
C2
31
EA
19 _XTAL1
R _{18 XTAL2}
9 _RST
12 ^INT0
13 INT1
14 T0
15 T1
1 _P1.0
2 _P1.1
3 _P1.2
4 _P1.3
5
6
7
8
P1.4
P1.5
P1.6
P1.7
W79E201
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
39 AD0
38 AD1
37 AD2
36 AD3
35 AD4
34 AD5
33 AD6
32 AD7
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
21 A8
22 A9
23 A10
24 A11
25 A12
26 A13
27 A14
28 A15
RD 17
WR 16
PSEN
ALE
29
30
TXD
RXD
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
74F373
A0 10 _A0
A1
A2
9
8
A1
A2
A3 7 _A3
A4 6 _A4
A5 5 _A5
A6 4 _A6
A7 3 _A7
A8 25 _A8
A9 24 _A9
A10 21 _A10
A11 23 _A11
A12 2 _A12
A13 26 _A13
A14 27
A15 1
A14
A15
GND _{20 CE}
22 _OE
27512
O0
O1
11
12
AD0
AD1
O2 ^{13 AD2}
O3
O4
O5
15
16
17
AD3
AD4
AD5
O6 ^{18 AD6}
O7 ^{19 AD7}
Figure A
CRYSTAL
12 MHz
16 MHz
C1
Not
necessary
Not
necessary
C2
Not
necessary
Not
necessary
R
Not
necessary
Not
necessary
Pull EA low to let CPU fetches code in the embedded flash ROM when the program counter is lower
than 16K and as the program counter is higher than 16K the CPU will fetch program code from
extended external program memory automatically.
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Publication Release Date: December 16, 2004
Revision A2