1 2 3 4
A
B
C
D
4321
D
C
B
A
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
RST
9
P3.0(RXD)
10
P3.1(TXD)
11
P3.2(INT0)
12
P3.3(INT1)
13
P3.4(T0)
14
P3.5(T1)
15
P3.6(WR)
16
P3.7(RD)
17
XTAL2
18
XTAL1
19
GND
20
(A8)P2.0
21
(A9)P2.1
22
(A10)P2.2
23
(A11)P2.3
24
(A12)P2.4
25
(A13)P2.5
26
(A14)P2.6
27
(A15)P2.7
28
PSEN
29
ALE/PROG
30
EA/VPP
31
(AD7)P0.7
32
(AD6)P0.6
33
(AD5)P0.5
34
(AD4)P0.4
35
(AD3)P0.3
36
(AD2)P0.2
37
(AD1)P0.1
38
(AD0)P0.0
39
VCC
40
U3
89C51/C52
b
c e
Q2
9012
VCC
R5
1K
Y1 12MHz
C2
30pf
C3
30pf
R7
10K
VCC
KEY
ALAM
KEY
b
c e
Q1
9012
VCC
R4
2.2K
ALAM
LS1
SPEAKER
GND
1
VCC
2
V0
3
RS
4
R/W
5
EN
6
D0
7
D1
8
D2
9
D3
10
D4
11
D5
12
D6
13
D7
14
A
15
K
16
U2
1602
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
RS
RS
WR
WR
EN
EN
VCC
VCC
A0
1
A1
2
A2
3
GND
4
SDA
5
SCL
6
WP
7
VCC
8
U1
AT24C02
+
C1
10uF
1
2
3
4
5
J1
JDQ-DC5
1 2
3 4
K0
RESET
1
2
3
CON3
VCC
9013
光光
KA
1
2
DC
电电电电
SW SPST
VCC
12
34
K1
12
34
K2
12
34
K3
12
34
A
12
34
K4
12
34
K5
12
34
K6
12
34
B
12
34
K7
12
34
K8
12
34
K9
12
34
C
12
34
*
12
34
K0
12
34
#
12
34
D
P10
P11
P12
P13
P14
P15
P16
P17
P10
P11
P12
P13
P14
P15
P16
P17
R9
1k
R8
10k
VCC
D1
LED
R6
2.2K
RT
104
C4
104
VCC
1
2
3
4
5
6
7
8
9
R10
103
