1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D D
C C
B B
A A
Title
Number RevisionSize
A3
Date: 2021/7/17 Sheet of
File: E:\电路城\频率计（频率，脉宽）\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
78L05
Volt Reg
30pF
C6
Cap
10uF
C5
Cap Pol1
30pF
C7
Cap
10K
R1
Res2
0.1uF
C2
Cap
100uF
C1
Cap Pol1
0.1uF
C4
Cap
100uF
C3
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
A
B
C
D
E
F
G
DP
1
2
3
4
L1
数码管4
A
B
C
D
E
F
G
DP
1
2
L2
数码管2
GND
1
TR
2
Q
3
R
4
VCC
8
DC
7
TH
6
CV
5
U2
555
VCC
0.1uF
C9
Cap
0.1uF
C8
Cap
1K
R3
Res2
R4
10k
VCC
GND
