6-20. IC PIN FUNCTION DESCRIPTION
" LCD BOARD IC501 CXP83620-011Q (SYSTEM CONTROLLER)
Pin No.Pin NameI/ODescription
1C-SCORISubcode sync (S0+S1) detection signal input from the CXD2589Q (IC703)
2RMCISircs remote control signal input terminal Not used (fixed at OL�)
3BUZZEROBuzzer sound signal output terminal
4LEDOLED drive signal output of the ALARM indicator (D602) OL�: LED on
5C-SENSIInternal status signal (sense signal) input from the CXD2589Q (IC703)
6C-SENS2IInternal status signal (sense signal) input from the CXA1992BR (IC701)
7C-SQCKOSubcode Q data reading clock signal output to the CXD2589Q (IC703)
8C-SQSOISubcode Q data input from the CXD2589Q (IC703)
9C-RSTOSystem reset signal output to the CXA1992BR (IC701) and CXD2589Q (IC703) OL�: reset
10C-CLOCKOSerial data transfer clock signal output to the CXD2589Q (IC703)
11C-LATCHOSerial data latch pulse signal output to the CXD2589Q (IC703)
12C-DATAOSerial data output to the CXD2589Q (IC703)
13RECIRecord/playback detection signal input terminal OL�: recording mode, OH�: playback mode
14R-COUNTIPLL serial data input from the FM/AM PLL (IC2)
15R-DATAOPLL serial data output to the FM/AM PLL (IC2)
16R-CLOCKOPLL serial data transfer clock signal output to the FM/AM PLL (IC2)
17R-LATCHOPLL serial data latch pulse signal output to the FM/AM PLL (IC2)
18V-LATCHOSerial data latch pulse signal output to the electrical volume (IC302)
19V-DATAOSerial data output to the electrical volume (IC302)
20V-CLOCKOSerial data transfer clock signal output to the electrical volume (IC302)
Power on/off control signal output to the power supply circuit, and power amplifier (IC303)
21P-CONO
OL�: standby mode, OH�: power on
22DC1IDC level check input of the dry battery and AC input (+9V check) (A/D input)
23DC2IDC level check input of the dry battery (+6V check) (A/D input)
24DC3IDC level check input of the dry battery (+3V check) (A/D input)
Key input terminal (A/D input) S601 to S606 (ALARM, TIMER, SLEEP, DISPLAY, MEM
25KEY1I
ENT, PLAY MODE MONO/ST ISS, SOUND keys input)
Key input terminal (A/D input) S609 to S615 (x, u, CLOCK, MEGA BASS, START/
26KEY2I
STOP, . # CLOCK, > 3 CLOCK keys input)
Key input terminal (A/D input) S617, S619 to S624 (POWER, BAND, VOL +, VOL �,
27KEY3I
PRESET �, PRESET +, AUTO PRESET keys input)
28MODE CHECKIDestination setting terminal
Shift clock output of the main system clock (4.19 MHz) OH� active
29SHIFT CLOCKO
Initial setting signal output terminal
System reset signal input from the reset signal generator (IC503) OL�: reset
30RSTI
For several hundreds msec. after the power supply rises, OL� is input, then it changes to OH�
31EXTALIMain system clock input terminal (4.19 MHz)
32XTALOMain system clock output terminal (4.19 MHz)
33VSSNGround terminal
34VLOLiquid crystal display drive bias control signal output terminal
35 to 37 VLC3 to VLC1NTerminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
38 to 41 COM0 to COM3OCommon drive signal output to the liquid crystal display (LCD501)
42 to 64 SEG0 to SEG22Segment drive signal output to the liquid crystal display (LCD501)O
65MOTOR ONOCapstan/reel motor (M301) on/off control signal output terminal
66A-MUTEOAudio muting on/off control signal output to the electrical volume (IC302) OH�: muting on
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