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3. IC PIN DESCRIPTION
• IC501 CXP83620-025Q/026Q (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
WRQ
I
CD WRQ signal input
2
RMC
I
Sircs receiver input
3
MUTE
O
MUTE output H: Mute
4
ADJ
O
F TEX frequency division output
5
FSEQ
I
CD SENSE read clock input
6
C-CE
O
CD chip enable output
7
C-CL
O
CD clock output
8
C-DI
O
CD data output
9
C-DO
I
CD data input
10
C-SW
I
CD limit switch input
11
C-DRF
I
CD DRF signal input
12
C-RES
O
CD system reset output
13
C-MUTE
O
CD MUTE output Not used. (Open)
14
R-COUNT
I
Tuner PLL data input
15
R-CLOCK
O
Tuner PLL clock output
16
R-DATA
O
Tuner PLL data output
17
R-LATCH
O
Tuner PLL latch output
18
NC
—
Not used. (Open)
19
V-DATA
O
Volume data output
20
V-CLOCK
O
Volume clock output
21
P-CON
O
System power control output H: Power on
22
REG CHK
I
Regulator check signal input
23
REC
I
Tape record signal input H: REC
24
SDA
I/O
EEPROM input/output
25 – 28
KEY-1 – 4
I
Key input
29
MODE CHECK
I
Mode set input
30
RST
I
System reset input
31
EXTAL
I
Oscillation input (4.19 MHz)
32
XTAL
O
Oscillation output (4.19 MHz)
33
VSS
—
GND
34
VL
O
LCD drive port ON/OFF output
35 – 37
VLC3 – 1
O
LCD drive voltage output
38 – 41
COM0 – 3
O
LCD drive common output
42 – 58
SEG0 – 16
O
LCD drive segment output
59
SEG17
O
LCD drive segment output Not used. (Open)
60, 61
NC
—
Not used. (Open)
62
INIT
O
Initial set signal output
63
TONE
O
TONE control output L: LPF on
64
MEGA BASS
O
MEGA BASS control output H: MEGA BASS on
65
BT-CHK
O
Battery check output H: Battery Low voltage
66
MT-CONT
O
MT control output H: Low voltage
67
ISS1
O
ISS1 output H: ISS1 Not used. (Open)
68
ISS2
O
ISS2 output H: ISS2 Not used. (Open)
69
TAPE
O
Tape function output H: Tape
70
RADIO
O
Tuner function output H: Radio
71
CD
O
CD function output H: CD
72
VDD
—
Power supply pin (+3.3 V)
73
TX
O
Oscillation output (150 kHz)
74
TEX
I
Oscillation input (150 kHz)
