44
22
CTRL3
I
Controls whether or not to input the VSYNC signal to the SEPIN input. L: to input the VSYNC
signal. H: not to input the VSYNC signal. (Connected to VDD)
23
RST
I
System reset input terminal. Pull-up resistor is built-in. (Hysteresis input).
24
VDD1(D)
Power supply. (+5V digital power supply).
Pin No.
Pin Name
I/O
Description
1
X-IN
I
A crystal oscillator (4.5MHz) is connected between these pins.
22
X-OUT
O
2
NC
Not connected.
3
CE
I
To enable the IC. Active "H".
4
DI
I
Digital data input from CPU (M38258MCM-080FP) when relevant key is operated.
Active "H".
5
CL
I
To clock in the data DI.
6
DO
O
Digital data output to CPU (M38258MCM-080FP).
7
TM-BASE
O
Outputs a reference clock signal (8Hz) for the clock.
8
MONO / BEAT
O
Outputs "H" when MONO / BEAT is switched.
Output "L" or "H" as follows:
9
FM / SW
O
2 BAND
3 BAND
3 BAND
AM
FM
LW
MW
FM
MW
SW
FM
H
L
H
H
L
H
L
L
Outputs "L" or "H" as follows:
10
MW / SW
O
2 BAND
3 BAND
3 BAND
AM
FM
LW
MW
FM
MW
SW
FM
L
L
H
L
L
L
H
L
To control internal counter.
I
General purpose counter input.
I
Receives "L" when station is tuned.
Not connected.
I
Receives the AM local oscillator frequency signal.
I
Receives the FM local oscillator frequency signal.
17
VDD
Supply power to IC (+5V).
18
PD
O
PLL charge pump output.
19
A-IN
I
The MOS transistor used for PLL active low pass filter.
20
A-OUT
O
21
VSS
Ground.
Pin No.
Pin Name
I/O
Description
IC, LC72131D
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