32
ICF-CD553RM
MAIN BOARD IC401
µ
PD789478GC-A28-8BT (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 31
SEG0 to SEG21
O
Segment drive signal output to the liquid crystal display
32
MEMO BUSY
I
Busy signal input from the voice messenger
33
MEMO RESET
O
Reset signal output to the voice messenger “L”: reset
34
MEMO CS
O
Chip select signal output to the voice messenger “L” active
35
MEMO SK
O
Serial data transfer clock signal output to the voice messenger
36
MEMO SO
I
Serial data input from the voice messenger
37
MEMO SI
O
Serial data output to the voice messenger
38
AVDD
—
Power supply terminal (+3.3V) (for A/D converter)
39
C-FSEQ
I
Synchronizing signal detection signal input from the digital signal processor
40, 41
,
ENCODE–
I
Jog dial pulse input from the rotary encoder
42
CD CLOSE DET
I
CD tray close detect switch input terminal “L”: CD tray is closed
43 to 46
KEY3 to KEY0
I
Front and side panel key input terminal (A/D input)
47
AVSS
—
Ground terminal (for A/D converter)
48
RC IN
I
SIRCS signal input from the remote control receiver
49
AC IN
I
Power failure detection signal input terminal
50
WRQ
I
Interruption detection signal input from the digital signal processor “L” active
51
CD CLOSE
O
CD tray open/close motor drive signal (close direction) output terminal “H” active
52
BUZZER
I
Beep sound drive 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
Focus on/off detection signal input from the digital signal processor
58
XRST
O
Reset signal output to the digital signal processor “L”: reset
59
POWER ON
O
Power amplifier on/off control signal output terminal “L”: power amplifier on, “H”: standby
60
CD OPEN
O
CD tray open/close motor drive signal (open direction) output terminal “H” active
61
CD OPEN DET
I
CD tray open detect switch input terminal “L”: CD tray is closed
62
MUTE
O
Muting on/off control signal output terminal Not used
63
COUNT
I
PLL serial count data input from the FM/AM PLL
64
RADIO CE
O
PLL chip enable signal output to the FM/AM PLL
65
RADIO DATA
O
PLL serial data output to the FM/AM PLL
66
RADIO CLK
O
PLL serial data transfer clock signal output to the FM/AM PLL
67
VOL CLK
O
Serial data transfer clock signal output to the electrical volume
68
VOL DAT
O
Serial data output to the electrical volume
69
IC0
—
Not used
70
XT1
I
Sub system clock input terminal (32.768 kHz)
71
XT2
O
Sub system clock output terminal (32.768 kHz)
72
VDD
—
Power supply terminal (+3.3V)
73
VSS
—
Ground terminal
74
X1
I
Main system clock input terminal (4.19 MHz)
75
X2
O
Main system clock output terminal (4.19 MHz)
•
IC Pin Function Description