30
HCD-NE3
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IC Pin Function Description
CONTROL BOARD IC801 LC877456C-53K5-E (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
PWR ON
O
Power relay drive signal output terminal “H”: on
2
CD ON
O
Power on/off control signal output for the CD mechanism section
3
CD XTXCN
O
Oscillation circuit control signal output to the CD DSP
“H”: auto oscillation, “L”: oscillation off
4
CD OPEN
I
CD lid open/close detection switch input terminal
5
CD XRST
O
Reset signal output to the CD DSP
6
CD DATA
O
Serial data output to the CD DSP
7
CD SENS
I
Internal status (SENSE) signal input from the CD DSP
8
CD CLK
O
Serial data transfer clock signal output to the CD DSP
9
CD XLT
O
Serial data latch pulse output to the CD DSP
10
NC
—
Not used
11
RESET
I
Reset signal input from the reset switch “L”: reset For several hundreds msec. after the power
supply rises, “L” is input, then it changes to “H”
12
XT1
I
Sub system clock input terminal (32.768 kHz)
13
XT2
O
Sub system clock output terminal (32.768 kHz)
14
VSS1
—
Ground terminal
15
CF1
I
Main system clock input terminal (10 MHz)
16
CF2
O
Main system clock output terminal (10 MHz)
17
VDD1
—
Power supply terminal (+3.2V)
18
I POWER
MONITOR
I
Power monitor input terminal
19, 20
NC
—
Not used
21
AREA
I
Model destination setting terminal
22
VOL ENCODER
I
Dial pulse input of the rotary encoder (for VOLUME control)
23
I POWER DOWN
I
Power down detection signal input terminal “L”: power down, normally : “H”
24
TA-SW
I
Cassette in/out detect switch signal input from the tape mechanism deck “L”: cassette in
25, 26
KEY1, KEY0
I
Front panel key input terminal (A/D input)
27
CD SCOR
I
Subcode sync (S0+S1) detection signal input from the CD DSP
28
F DATA
O
Serial data output to the electrical volume
29
RMC
I
Remote control signal input from the remote control receiver
30
TU DI
I
Serial data input from the FM/AM tuner unit
31
NC
—
Not used
32
TU DO
O
Serial data output to the FM/AM tuner unit
33
TU MUTE
O
Tuner muting on/off control signal output to the FM/AM tuner unit
34
TU CLK
O
serial data transfer clock signal output to the FM/AM tuner unit
35
TU CE
O
Chip enable signal output to the FM/AM tuner unit
36
TU TUNED
I
Tuning detection signal input from the FM/AM tuner unit
37
TU STEREO
I
FM stereo detection signal input from the FM/AM tuner unit
38
NC
—
Not used
39
ST/BY
O
LED drive signal output terminal
40
MD LED
O
LED drive signal output terminal
