CSD-XD55
17
17
SECTION 6
DIAGRAMS
Pin No.
Pin Name
I/O
Pin Description
6-1. IC PIN DESCRIPTION
• IC802 uPD789477GC-A42-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Pin Description
1, 2
NC
—
Not used. (Open)
3 to 5
VLC2 to 0
I
LCD drive bias voltage input
6 to 9
COM0 to 3
O
LCD drive common output
10 to 26
S0 to 16
O
LCD drive segment output
27
REC
I
Tape record signal input H: REC
28
AC-CHK
I
AC power supply detection signal input L: AC in
29
CD-DOOR
I
CD door open/close switch input L: Close
30
HP DET
–
Not used.
31
B/LIGHT CONT
O
Back light ON/OFF control output.
32
SURROUND CONT
O
Sorround ON/OFF control output.
33
NC
–
Not used. (Open)
34
LINE IN
O
LINE IN signal output
35
A-MUTE
O
Audio mute output H: Mute
36
CD
O
CD function output H: CD
37
TAPE
O
Tape function output H: Tape
38
AVDD
—
Analog power supply pin for A/D converter (+3.3 V)
39
BTT-CHK-H
I
Battery check input for Hi-voltage
40
BTT-CHK-M
I
Battery check input for Mid-voltage
41, 42
V CHECK
I
Not used. (Open)
43 to 45
KEY3 to 1
I
Key input
46
MODE CHK
I
Destination setting input
47
AGND
—
Analog ground for A/D converter
48
RMC IN
I
Sircs receiver data input
49
TC-PLAY
I
Tape play switch input L: Play
50
W-UP/INI
O
Wake-up/Initial setting read signal output
51
3.3V MONITOR
I
3.3V MONITOR signal input
52
C-WRQ
I
CD write request data input
53
C-DOUT
I
CD digital signal processor data input
54
C-DIN
O
CD digital signal processor data output
55
C-CLK
I
CD serial data transfer clock signal input
56
R-COUNT
I
Tuner PLL IF count input
57
R-DATA
O
Tuner PLL data output
58
R-CLK
O
Tuner PLL clock output
59
R-LAT
O
Tuner PLL latch output
60
B-MUTE
O
Tuner mute signal output H: Mute
61
C-DRF
I
CD DRF signal input
62
C-CE
O
CD chip enable output
63
C-FSEQ
I
CD frame SYNC input
64
C-XRST
O
CD system reset output
65
P-CON
O
System power control output H: PCON
66
ISS1
O
ISS1 output
67
ISS2
O
ISS2 output
68
DBB
O
MEGA BASS control output H: MEGA BASS off, L: MEGA BASS on
69
ICO
I
Connected to VSS.
70
XT1
I
Sub system oscillation input (32.768 kHz)
71
XT2
O
Sub system oscillation output (32.768 kHz)
6-2. CIRCUIT BOARDS LOCATION
72
VDD
—
Main power supply pin for A/D converter (+3.3 V)
73
VSS
—
Main ground
74
X1
I
Main system oscillation input (4.19 MHz)
75
X2
O
Main system oscillation output (4.19 MHz)
76
RST
I
System reset input
77
V-CLK
O
Volume clock output
78
V-DATA
O
Volume data output
79
SCL
O
EEPROM clock output
80
SDA
I/O
EEPROM input/output
HP board
CONTROL board
TC board
TUNER board
SELECT board
BATTERY (1) board
BATTERY (2) board
MAIN board
CD board
POWER board
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