34
ICF-CD73/CD73V
6-16.
IC PIN FUNCTION DESCRIPTION
•
LCD BOARD IC401
µ
PD789477GC-A33-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1, 2
NC
—
Not used
3 to 5
VLC2 to VLC0
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
6 to 9
COM0 to COM3
O
Common drive signal output to the liquid crystal display
10 to 27
SEG17 to SEG0
O
Segment drive signal output to the liquid crystal display
28 to 30
VERSION0 to
VERSION2
I
Setting input terminal for destination
31
POWER ON
O
Power on/off control signal output terminal for the power amplifier
“L”: standby mode, “H”: power amplifier on
32
R ON
O
Power on/off control signal output for the tuner section “H”: tuner power on
33 to 37
NC
I
Not used
38
AVDD
—
Power supply terminal (+3.3V) (analog system)
39
FSEQ
I
CD synchronizing signal detection signal input from the digital signal processor
40
NC
I
Not used
41
AC IN
I
Power detection signal input terminal when connected AC power adapter (A/D input)
42
VM
I
Middle voltage (+3V) detection input for battery check
43
VH
I
High voltage (+6V) detection signal input for AC or battery check
44 to 46
KEY2 to KEY0
I
Front and top panel key input terminal (A/D input)
47
AVSS
—
Ground terminal (for analog system)
48
NC
I
Not used
49
DC CHK
I
Power failure detection signal input terminal “L”: power failure, “H”: power on
50
WRQ
I
CD interruption signal input from the digital signal processor
51
KEY CHK
I
Key interruption detection signal input terminal
52
BUZZER
O
Beep sound signal output terminal
53
CD DATA IN
I
Serial data input from the digital signal processor
54
CD DATA
O
Serial data output to the digital signal processor
55
CD CLK
O
Serial data transfer clock signal output to the digital signal processor
56
CD CE
O
Chip enable signal output to the digital signal processor
57
DRF
I
CD focus on/off detection signal input from the digital signal processor
58
XRST
O
System reset signal output to the digital signal processor “L”: reset
59
CD ON
O
Power on/off control signal output for the CD section “H”: CD power on
60
NC
I
Not used
61
CD OPEN
I
CD lid open/close detect switch input terminal “L”: CD lid is closed, “H”: CD lid is opened
62
MUTE
O
Tuner muting on/off control signal output to the FM/AM PLL “L”: muting on
63
COUNT
I
PLL serial count data input terminal from the FM/AM PLL
64
R CLK
O
PLL serial data transfer clock signal output to the FM/AM PLL
65
R DATA
O
PLL serial data output to the FM/AM PLL
66
R CE
O
PLL chip enable signal output to the FM/AM PLL
67, 68
NC
I
Not used
69
IC
—
Ground terminal
70
XT1
I
Sub system clock input terminal (32.768 kHz)
71
XT2
O
Sub system clock output terminal (32.768 kHz)
72
VDD0
—
Power supply terminal (+3.3V)
73
VSS0
—
Ground terminal
74
X1
I
Main system clock input terminal (4.19 MHz)
75
X2
O
Main system clock output terminal (4.19 MHz)
