Post on 07-Dec-2015
description
XTAL2 18
XTAL1 19
ALE 30
EA 31
PSEN 29
RST 9
P0.0/AD039
P0.1/AD138
P0.2/AD237
P0.3/AD336
P0.4/AD435
P0.5/AD534
P0.6/AD633
P0.7/AD732
P1.0 1
P1.1 2
P1.2 3
P1.3 4
P1.4 5
P1.5 6
P1.6 7
P1.7 8
P3.0/RXD10
P3.1/TXD11
P3.2/INT012
P3.3/INT113
P3.4/T014
P3.7/RD17 P3.6/WR16 P3.5/T115
P2.7/A1528
P2.0/A821
P2.1/A922
P2.2/A1023
P2.3/A1124
P2.4/A1225
P2.5/A1326
P2.6/A1427
U?
AT89C51
D7
14
D6
13
D5
12
D4
11
D3
10
D2
9
D1
8
D0
7
E6
RW
5
RS
4
VS
S1
VDD
2V
EE
3
16 X 2 ALPHANUMERIC LCD
X
C1
30pF
C2
30pF
+5 V
+5V
C3
10u
R1
10k
Q2N2222A
R21k
CIRCUIT DIAGRAM
+15V
TX
3
21
411
A:A
LM324
RX
R42M
C4
3.3nF
R682k
R52M
C5
3.3nF
R710k 5
67
411
A:B
LM324
10
98
411
A:C
LM324 R833k
D1
1N4148
D21N4148
R9100k
C6
2.2nF
12
1314
411
A:D
RV1RES-VAR
R1010k
+5V
-15V
+15V
3 2
N:A
5 4
N:B
7 6
N:C
9 10
N:DCD4049
11 12
N:E
14 15
N:F
R1110k
R310k