1
1
2
2
3
3
4
4
D D
C C
B B
A A
Title
Number RevisionSize
A4
Date: 2012/11/5 Sheet of
File: E:\我的电子制作\..\TIMETIME.SCHDOCDrawn By:
RS
RW
E
15
R1
+5V
GND
+5V
GND
1 2
12MHZ
30pF
30pF
1 2
32.768KHZ
beep
3V
+5V
GND
GND
D1
D2
9012
36k
R2
+5V
100
R3
100
R4
+5V +5V
4.7k
R5
+5V
GND
DQ
S1
S2
S3
S3
S2
S1
GND
EA/VPP
31
XTAL1
19
XTAL2
18
RST/VPD
9
P3.7/RD
17
P3.6/WR
16
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.5/T1
15
P1.0/T
1
P1.1/T
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
P0.0
39
P0.1
38
P0.2
37
P0.3
36
P0.4
35
P0.5
34
P0.6
33
P0.7
32
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
P3.1/TXD
11
P3.0/RXD
10
Vcc
40
Gnd
20
AT89S5X
IC1
STC89C52
GND
GND
1
VCC
2
VO
3
RS
4
RW
5
E
6
DB0
7
DB1
8
DB2
9
DB3
10
DB4
11
DB5
12
DB6
13
DB7
14
BG VCC
15
BG GND
16
LCD 1602
LCD1
LCD1602
VDD
3
I/O
2
GND
1
IC3
DS18B202K R6
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
D1
D2
D1
D2 E
RW
RS
+5V
GND
0.1uF
C4
DQ
P2.3
P2.2
P2.1
S3
S2
S1 beep
beep
Vcc2
1
X1
2
X2
3
GND
4
RST
5
I/O
6
SCLK
7
Vcc
8
IC2
DS1302
100uF
C3
P2.3
P2.2
P2.1
1N4148
