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+5V
Sandby control line
18V Power Supply
Control Circuit
+5V
Input selection
Keys and LEDS
+5V
Main Mute
Mute Circuit
Record Out
Circuit
IC503
V
S
G
IR receiver
D501
RED
BLUE
Standby LED
MICROPROCESSOR CONNECTION DIAGRAM
AMBER
Volume
Circuit
NC
1
NC
2
NC
3
Vss
4
SDA
5
SCL
6
NC
7
Vcc
8
IC502
24C01
C504
27P
C505
27P
X501
11.0592MHz
PHONE5
MP IN
DATA
CLK
STB
U301
TC9164
Input Selection IC
P1.0
1
RST
9
RXD/P3.0
10
TXD/P3.1
11
INT0/P3.2
12
INT1/P3.3
13
T0/P3.4
14
T1/P3.5
15
WR/P3.6
16
RD/P3.7
17
XTAL2
18
XTAL1
19
VSS
20
P2.0/A8
21
P2.1/A9
22
P2.2/A10
23
P2.3/A11
24
P2.4/A12
25
P2.5/A13
26
P2.6/A14
27
P2.7/A15
28
PSEN
29
ALE
30
EA
31
P0.7/AD7
32
P0.6/AD6
33
P0.5/AD5
34
P0.4/AD4
35
P0.3/AD3
36
P0.2/AD2
37
P0.1/AD1
38
P0.0/AD0
39
VDD
40
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
IC501
AT89S51
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