– 40 –
6-9.
IC PIN FUCTION DESCRIPTION
•
MAIN BOARD IC401
µ
PD789406AGC-017-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
VDD1
—
Power supply terminal (+5V)
2
BIAS
O
Bias output for the liquid crystal display drive
3 to 5
VLC0 to VLC2
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
6
VSS1
—
Ground terminal
7 to 10
COM0 to COM3
O
Common drive signal output to the liquid crystal display (LCD401)
11 to 26
SEG0 to SEG15
O
Segment drive signal output to the liquid crystal display (LCD401)
27 to 31
NC
—
Not used (fixed at “L”)
32
BUZ MUT
O
Buzzer sound muting on/off control signal output terminal “L”: muting on
Not used (pull down)
33
C RST
O
System reset signal output to the CXA1992BR (IC501) and CXD2589Q (IC551) “L”: reset
34
KS4
O
Key strobe signal output to the key matrix Not used (pull down)
35 to 38
KS0 to KS3
O
Key strobe signal output to the key matrix
39
AVDD
—
Power supply terminal (+5V) (for analog system)
40
AVREF
—
Reference voltage (+5V) terminal (for A/D converter)
41
VERSION0
I
Destination setting terminal “L”: US, Canadian models, “H”: AEP model
42
VERSION1
I
Destination setting terminal Not used (fixed at “L” in this set)
43
CLOSE
I
Disc table close detection switch (S480) input terminal “H”: disc table is closed
44
OPEN
I
Disc table open detection switch (S481) input terminal “H”: disc table is opened
45
C SENS2
I
Internal status signal (sense signal) input from the CXA1992BR (IC501)
46
C SENS1
I
Internal status signal (sense signal) input from the CXD2589Q (IC551)
47
C SQSO
I
Subcode Q data (80 bit serial) input from the CXD2589Q (IC551)
48
AVSS
—
Ground terminal (for analog system)
49
SCOR
I
Subcode sync (S0+S1) detection signal input from the CXD2589Q (IC551)
50
C MUT
O
Digital muting on/off control signal output to the CXD2589Q (IC551) “H”: muting on
51
C SQCK
O
Subcode Q data (80 bit serial) reading clock signal output to the CXD2589Q (IC551)
52
AC IN
I
Power failure detection input terminal “L”: power failure, “H”: power on
53
BUZZER
O
Buzzer sound drive signal output terminal
54
C CLK
O
Serial data transfer clock signal output to the CXD2589Q (IC551)
55
C LAT
O
Serial data latch pulse signal output to the CXD2589Q (IC551)
56
C DATA
O
Serial data output to the CXD2589Q (IC551)
57
M MUT
O
Muting on/off control signal output terminal “H”: muting on Not used (pull down)
58
AMUT
I/O
At initial mode: Setting terminal for the test mode (CD manual mode) “L” CD manual mode
At normal mode: Audio line muting on/off control signal output terminal “L”: muting on
59
CD ON
I/O
At initial mode: Setting terminal for the test mode (CD auto mode) “L”: CD auto mode
At normal mode: Power on/off control signal output for the CD +5V power supply
“L”: CD power on
60
RADIO ON
O
Power on/off control signal output for the radio +5V power supply “L”: radio power on
61
R DATA
O
PLL serial data output to the FM/AM PLL (IC51)
62
R CLK
O
PLL serial data transfer clock signal output to the FM/AM PLL (IC51)
63
R LAT
O
PLL serial data latch pulse signal output to the FM/AM PLL (IC51)
64
POWER ON
O
Front side speaker on/off control signal output terminal “H”: speaker on
65
SHIFT0
O
Shift clock output of the main system clock (4.194 MHz) “H” active Not used (pull down)
66
SHIFT1
O
Shift clock output of the main system clock (4.194 MHz) “H” active Not used (pull down)
67
RESET
I
System reset signal input from the reset signal generator (IC402) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
68
X2
O
Main system clock output terminal (4.194 MHz)
69
X1
I
Main system clock input terminal (4.194 MHz)
