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4-4 PORT ALLOCATIONS
4-4-1 CPU (IC20)
Pin
Port
number
name
Input port from WFM IC (IC7, pin 7) for
1
FMST
the stereo indicator.
OSC1,
Input ports for the CPU system clock
8, 9
oscillator (X6; 9.8304 MHz).
OSC2
Input port for the reset signal.
10
RES
Outputs power switching circuit control
17
POCO
signal.
High : While turning power ON.
Outputs attenuator control signals.
Low : When attenuator function is
18
ATTC
Outputs AGC time constant control
signals.
19
SCAN
High : While scanning (fastest AGC
Outputs AGC time constant control
signals.
20
AGCS
Low : When WFM or FM mode is
Outputs ANL control signals.
21
ANL
High : While ANL fuction is ON.
Outputs AF mixing control signal for
22
SWAF
the stereo audio.
MST1,
Outputs strobe signals for the output
23, 24
expander ICs (IC1, IC3).
MST2
Outputs data signal for the electronic
25
AFDT
volume IC (IC23).
Input port for serial signal from the
26
MSI
EEPROM IC (IC20).
Outputs data signal for the EEPROM
27
MSO
IC (IC20) and output expander ICs
(IC1, IC3).
Outputs clock signal for the EEPROM
IC (IC20) and output expander ICs
28
Mck
(IC1, IC3).
Outputs chip select signal to the EEP-
29
ECS
ROM IC (IC20).
Outputs 1st LO filter select signals.
High : When frequencies from 0.01 to
34
PFL2
Low : When frequencies from 265.7
Outputs VCO1 shift signals.
35
VSF1
Outputs VCO2 shift signals.
36
VSF2
Description
ON.
speed).
selected (AGC-fast).
(AM mode only)
265.699 MHz are displayed.
to 1300.0 MHz are displayed.
CPU (IC20) — continued
Pin
Port
number
name
VCO1,
37, 38
VCO2
39
DST1
41
PSTB
42
Pdat
43
Pck
48
RXD
49
TXD
54
TUNE
59
LCT
60
NOIN
61
L1AD
62
CTAD
63
SMAD
4 - 6
Description
Output VCO2/VCO1 select signals.
Display freq.
Selected
VCO freq.
[MHz]
VCO
0.01–
533.40–
VCO1
108.299
108.3–
750.00–
VCO2
265.699
265.7–
533.40–
VCO1
266.699
266.7–
532.40–
VCO1
267.699
267.7–
534.40–
VCO1
483.299
483.3–
750.00–
VCO2
799.999
800.0–
533.30–
VCO1
1016.699
1016.7–
750.00–
VCO2
1300.000
1033.300
Outputs strobe signals for reference
frequency and VXO frequency.
Outputs strobe signals for the PLL IC
(IC8).
Outputs serial data signals for the
PLL IC (IC8).
Outputs serial clock signal for the PLL
IC (IC8).
Input port for data signal from the
connected PC via the RS-232C inter-
face IC (IC9).
Outputs data signal to the connected
PC via the RS-232C interface IC
(IC9).
Outputs tunable bandpass filter con-
trol voltage.
Input port for unlock signal from the
PLL IC (IC8).
Low : PLL unlock
Input port signal strength detection
signal (NOIN; pulse-type).
Input port for 1st LO PLL lock voltage.
Input port for the CTCSS decoded
signal.
Input port for S-meter signal.
[MHz]
749.90
1064.70
534.35
533.35
749.95
1066.65
749.95
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