Pin Port
Description
number name
Pin Port
Description
number name
4 - 5
26
27
28
29
30
31
32
33
39
42
43
44, 45
46
47
48
50
51
52
53
54
LIGHT
+3SC
POWERC
B3
B2
B1
KSQL
RESET
EDA
PCK/IS
ECK/I3
I2, I1
PSTB
PDA
DBL2
300MC
GC
800MC
UHFC
VHFC
Output LCD backlight control signal.
High : Lights ON
Outputs +3S requlator control singal
for the receiver circuit.
Low : Receiving.
Outputs +3V requlator control singals.
Outputs high-pass filter select signal.
Low : When frequency 15 to 30
MHz are displayed.
Outputs band-pass filter select signal.
Low : When frequency 1.9 to 15
MHz are displayed.
Outputs low-pass filter select signal.
Low : When frequency 0.5 to 1.5
MHz are displayed.
Input port for the [SQL] switch.
High : While [SQL] switch is pushed.
Input port for the RESET signal.
Outputs data signals to the EEPROM
IC (LOGIC unit; IC2).
Outputs clock signal to both PLL IC
(RF unit; IC3) and EEPROM IC
(LOGIC unit; IC2).
Outputs clock signal to EEPROM IC.
Input ports for Initial matrix.
Outputs strobe signals for the PLL IC.
Outputs data signals to the PLL IC.
Input port for PLL unlock signal from
PLL IC (RF unit; IC3).
Output control signal for the doubler
circuit.
Low : Activates the 2nd doubler cir-
cuit.
Outputs low-pass filter select signal.
Low : When frequencies 30 to 118
MHz or 175 to 330 MHz are
displayed.
Outputs band-pass filter select signal.
Low :When frequencies 833 to
1309.995 MHz are displayed.
Outputs band-pass filter select signal.
Low : When frequencies 470 to
1027 MHz are displayed.
Outputs band-pass filter select signal.
Low : When frequencies 330 to 470
MHz are displayed.
Outputs band-pass filter select signal.
Low : When frequencies 118 to 175
MHz are displayed.
55
56
SHIFT
HFC
Output port for 1st VCO SHIFT signals
to the shift switch (RF unit; Q29).
High : Shift ON (380 – 550 MHz).
Low : Shift OFF (267.2 – 380 MHz).
Output control signal for the 0.5–30
MHz band RF amplifier.
Low : Receiving 0.5–30 MHz bands.
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