Rainbow Electronics АТ89С51 - Manual (Page 6)

Microcontroller
5-16
Figure 1. AT89C51 Moving Display Application Example
D0
D1
D2
D3
D4
D5
D6
A0
A1
WR
DL1414T
U2
8
9
10
11
2
1
12
5
4
D0
D1
D2
D3
D4
D5
D6
A0
A1
WR
DL1414T
U3
8
9
10
11
2
1
12
5
4
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
D0
D1
D2
D3
D4
D5
D6
A0
A1
WR
DL1414T
U4
8
9
10
11
2
1
12
5
4
D0
D1
D2
D3
D4
D5
D6
A0
A1
WR
DL1414T
U5
8
9
10
11
2
1
12
5
4
21
22
23
24
25
26
27
28
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
39
38
37
36
35
34
33
32
PSEN
ALE/PROG
P3.6/WR
P3.7/RD
29
30
16
17
AT89C51
P3.0/RXD
P3.1/TXD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
1
2
3
4
5
6
7
8 8
7
6
5 1
2
3
4
10
11
12
13
14
15
U1
EA/VPP
XTAL1
XTAL2
RST
31
19
18
9
C3
30 pF
C2
30 pF
R1
8.2 K
C1
10 uF
VCC
Note: 0.1 uF bypass caps on all ICs.
SW DIP-4
S1
3
3
3
3
+
Y1
6 MHz