1 2 3 4
A
B
C
D
4321
D
C
B
A
EA/VPP
31
XTAL1
19
XTAL2
18
RST
9
P37/RD
17
P36/WR
16
P32/INT0
12
P33/INT1
13
P34/T0
14
P35/T1
15
P10/T2
1
P11/T2EX
2
P12
3
P13
4
P14
5
P15(MOSI)
6
P16(MISO)
7
P17(SCK)
8
AD0/P00
39
AD1/P01
38
AD2/P02
37
AD3/P03
36
AD4/P04
35
AD5/P05
34
AD6/P06
33
AD7/P07
32
A8/P20
21
A9/P21
22
A10/P22
23
A11/P23
24
A12/P24
25
A13/P25
26
A14/P26
27
A15/P27
28
PSEN
29
ALE/PROG
30
P31/TXD
11
P30/RXD
10
GND
20
VCC
40
U2
51/52
R3
10k
C3
30pF
C2
30pF
Y1
12MHz
C1
10uF
VCC
VCC
P17
P26
P27
P10
P11
P12
P13
P14
P15
P16
P25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
J6
CON16
VSS
VDD
V0
RS
R/W
E
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
K
A
VCC
VCC
P27
P26
P25
液晶
VCC
7
1
CE
8
5
2
0
9
6
3
=
/
*
-
+
P10 P11 P12 P13
P14
P15
P16
P17
4
RET
COM
1
R1
2
R2
3
R3
4
R4
5
R5
6
R6
7
R7
8
R8
9
RP1
10k 103
P00
P01
P02
P03
P04
P05
P06
P07
P00
P01
P02
P03
P04
P05
P06
P07
R1
1K
R2
10K
1
6
2
7
3
8
4
9
5
CL+
1
CL-
3
T1OUT
14
R1IN
13
C2+
4
C2-
5
V-
6
GND
15
VCC
16
V+
2
T1IN
11
R1OUT
12
MAX232
104
104
104
104
104
3
2 1
P1
POWER
VCC
1
1
2
2
3
3
4
4
5
5
6
6
S1
P30
P31
P30
P31
自自自自
DC
电电电电