A-905TX
MICROPROCESSOR TERMINAL DESCRIPTION
Q701:HD404316-E30H
Pin No.
Function
I/O
Descriptions
1
TEST
I
Test pin.
2
RESET
I
System reset input pin.
3
OSC1
I
Pins to connect the ceramic oscillator 4.0MHz.
4
OSC2
O
5
GND
I
Ground pin.
6
AVSS
I
Analog reference ground for A/D converter.
7
SEL IN-1
I
Rotary switch connection input pin for input selector.
8
SEL IN-2
I
9
KEY IN
I
Operation key connection pin.
10
905/909
I
Initializing input pin for model selector.
11
RI OUT
O
System code output pin.
12
RI IN
I
System code input pin.
13
HP IN
I
Head phone switch position detector pin.
14
DIRECT
I
Direct switch position detector pin.
15
AVCC
I
Analog reference voltage for A/D converter.
16
VCC
I
Power supply pin (+5V).
17
POFF
I
Power failure detector pin.
18
REM IN
I
Remote control signal input pin.
19
NC
O
Speaker relay control signal output pin.
20
MUT LED
O
MUTING indicator control pin. Light on and off when the muting circuit turns on.
21
NC
I
No connection.
22
NC
23
VOL UP
O
Volume control output pin.
24
VOL DOWN
O
Volume control output pin.
25
POWER 2
Power amplifier control output pin.
26
INPMUT
O
Muting control output pin.
27
NC
Connect to the ground.
28
NC
Connect to the ground.
29
NC
30
NC
31
SBASS-1
O
Acoustic Presence control output pin.
32
SBASS-2
O
33
SBASS-3
O
Connect to the ground.
Connect to the ground.
Speaker protect signal detector pin.
Acoustic Presence indicator output pin.
Acoustic Presence indicator output pin.
Connect to the ground.
Clock output pin of source selector and indicator ICs.
Latch output pin of source indicator IC.
Data output pin of source selector and indicator ICs.
Chip enable output pin of source selector IC.
44
NC
No connection.
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