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
34
NC
Connect to the ground.
35
NC
Connect to the ground.
36
PROTECT
I
Speaker protect signal detector pin.
37
SBASS LEDA
O
Acoustic Presence indicator output pin.
38
SBASS LEDB
O
Acoustic Presence indicator output pin.
39
NC
Connect to the ground.
40
CLK
O
Clock output pin of source selector and indicator ICs.
41
LAT
O
Latch output pin of source indicator IC.
42
DATA
O
Data output pin of source selector and indicator ICs.
43
CE
O
Chip enable output pin of source selector IC.
44
NC
No connection.
