Aiwa FR-DAW450 Service Manual page 15

IC DESCRIPTION
IC, LC72343G
Pin No. Pin Name I/O
1 XOUT O Connections for a 75kHz crystal oscillator element.
2 TEST2 I IC test pins. These pins must be tied to ground.
3 PA3 I
4 PA2 I
Special-purpose key return signal input port.
5 PA1 I
6 PA0 I
7 PB3 O
8 PB2 O
Special-purpose key source signal output port.
9 PB1 O
10 PB0 O
11 PC3 I/O
12 PC2 I/O
13 PC1 I/O
14 PC0 I/O
General-purpose I/O port.
15 PD3 I/O
16 PD2 I/O
17 PD1 I/O
________
18 INT/PD0 I/O
19 PE1 O
General-purpose output port.
20 BEEP/PE0 O
21 PF2 I
22 PF1/ADI1 I General-purpose input and A/D converter input shared function port.
23 PF0/ADI0 I
24 VSS — Ground pin.
25 PG3/S20 I/O
26 PG2/S19 I/O
27 PG1/S18 I/O
28 PG0/S17 I/O
LCD driver segment output and general-purpose I/O shared function port.
29 PH3/S16 I/O
30 PH2/S15 I/O
31 PH1/S14 I/O
32 PH0/S13 I/O
33-44 S12-S1 O LCD driver segment output pins.
45 COM4 O
46 COM3 O
LCD driver common output pins.
47 COM2 O
48 COM1 O
49 DBR4 —
50 DBR3 —
LCD power supply stepped-up voltage pins.
51 DBR2 —
52 DBR1 —
Description
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Pin No. Pin Name I/O
________
53 RES I System reset input.
54 HCTR I Universal counter dedicated input port.
55 VDD — Power supply pin.
56 FMIN I FM VCO (local oscillator) input.
57 AMIN I AM VCO (local oscillator) input.
58 VSS — Ground pin.
59 E0 O The main charge pump output.
60 AIN O
61 AOUT O Transistor used for the low-pass filter amplifier. Connect AGND to ground.
62 AGND O
63 TEST1 I IC test pins. These pins must be tied to ground.
64 XIN I Connections for a 75kHz crystal oscillator element.
Description
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