1
1
2
2
3
3
4
4
D D
C C
B B
A A
Title
Number RevisionSize
A4
Date: 2021/6/21 Sheet of
File: I:\办公2021下\时钟6.20\原理图\Sheet1.SchDocDrawn By:
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
P2.0
21
P2.1
22
P2.2
23
P2.3
24
P2.4
25
P2.5
26
P2.6
27
P2.7
28
PSEN
29
ALE/PROG
30
EA
31
P0.7
32
P0.6
33
P0.5
34
P0.4
35
P0.3
36
P0.2
37
P0.1
38
P0.0
39
VCC
40
U1
80511 2
Y1
XTAL
Vin Vout
GND
7805
Volt Reg
30pF
C1
Cap
10uF
C3
Cap Pol1
30pF
C2
Cap
10K
R1
Res2
0.1uF
C5
Cap
100uF
C4
Cap Pol1
0.1uF
C7
Cap
100uF
C6
Cap Pol1
1
2
P1
电源接口
GND
GND
VCC
VCC
1
2
3
4
5
6
7
8
9
RP1
RESP
S1
SW-PB
LS1
Speaker
D1
LED3
VCC
1B
1
2B
2
3B
3
4B
4
5B
5
6B
6
7B
7
1C
16
2C
15
3C
14
4C
13
5C
12
6C
11
7C
10
COM
9
U4
ULN2003
P15
P30
P31
P32
P33
P34
P35
P36
P37
P15 10K
R2
Res2
D2
LED3
10K
R3
Res2
D3
LED3
10K
R4
Res2
D4
LED3
10K
R5
Res2
D5
LED3
10K
R6
Res2
D6
LED3
10K
R7
Res2
D7
LED3
10K
R8
Res2
D8
LED3
10K
R9
Res2
P30
P31
P32
P33
P34
P35
P36
P37
AB/BA
1
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
GND
10
VCC
20
CE
19
B0
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
U3
74LS245
GND
VCC
GND
VCC
D0
D1
D2
D3
D4
D5
D6
D7
A
B
C
D
E
F
G
DP
1
2
DS1
A
1
B
2
C
3
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
E1
6
E2
4
E3
5
U2
74138
GND
VCC
D0
D1
D2
D3
D4
D5
D6
D7
S2
SW-SPST
S3
SW-PB
S4
SW-PB
GND
P10
P11
P12
P10
P11
P12
GND