10
WM-FX277 SECTION 5
DIAGRAMS
Pin No. Pin name I/O Descliption
1 XOUT O Crystal oscillator output (75kHz).
2 TEST2 – Not used (Ground).
3 PA3 I Key input.
4 PA2 I Key input.
5 PA1 I Key input.
6 PA0 I Key input.
7 PB3 O Key output.
8 PB2 O Key output.
9 PB1 O Key output.
10 LOCAL/DX – Not used (OPEN).
11 HOLD I HOLD switch input. “H”: ON, “L”: OFF
12 LOCAL SW – Not used (OPEN).
13 TV (H) – Not used (OPEN).
14 BAND O Band select signal output.
15 SD I Tuning signal detect input.
16 COMP – Not used (OPEN)
17 N/R SW – Not used (OPEN)
18 BACK UP I Back up voltage input.
19 AMP ON O Power ON/OFF signal output.
20 BEEP O Beep signal output.
21 BATT CHECK I Back up cancel input.
22 BATT REF I A/D reference voltage input.
23 –––––––––– – Not used (Ground).
24 VSS – Ground terminal.
25 RADIO ON O Radio ON signal output.
26 MEGA BASS O MEGA BASS ON signal output.
27 MUTE O Mute ON signal output.
28 TAPE I Tape ON input.
29 PRE CTL O Preamplifier control output.
30 MOTOR CTL O Motor control output.
31 ID I Destination select input.
32-44 S1-13 O LCD segment output.
45-48 COM1-4 O LCD common output.
49-52 DBR1-4 – LCD power supply.
53 RESET I Reset input (Fixed “H”).
54 TU VCC – Not used (OPEN).
55 VDD – Power supply.
56 FM IN I FM osc frequency input.
57 AM IN I AM osc frequency input.
58 VSS – Ground terminal.
59 E.O O Error (PWM) signal output.
60 LPF IN I LPF input.
61 LPF OUT O LPF output.
62 LPF GND – Ground terminal.
63 TEST 1 – Not used (Ground).
64 X IN I Crystal oscillator input (75kHz).
5-1. EXPLANATION OF IC TERMINALS
IC702 LC72348W-9A36 SYSTEM CONTROL
