Icom IC-F80DS Service Manual page 12

4-6-1 CPU (continued)
Pin Port
number name
Input port for the [VOL] control (VR
38 PWRSW UNIT; R1).
Low: While power is ON.
Input port for the decodedDTMF sig-
39 DDST nals from the DTMF decoder IC (IC300,
pin 11).
Inputs offering signal from the optional
40 CIRQ unit and DSP unit.
Low: Offering signal is output.
Outputs control signal for the power
41 PWRO switch circuit (Q309, Q310).
High: Power ON.
43 SENC Outputs single tone encode signal.
44 BEEP Outputs beep audio signals.
Input port for single tone decode sig-
45 SDEC nal from the base band IC (IC301,
pin 1).
Input port for CTCSS/DTCS signal
46 CDEC
from the LPF (IC12, pin 7).
Input port for the PLL unlock signal.
47 ULCK
Low: The PLL circuit is unlocked.
Input port for the connected battery pack
48 BATV for the low battery voltage detection.
Low: The battery voltage is low.
49 LVIN Input port for the PLL lock voltage.
Input port for the "RSSI" signal from
50 RSSI
the FM IF IC (IC3, pin 12).
• Input port for the transceiver's internal
temperature detecting signal.
High: Internal temperature is high.
TEMP/
51 • Input port for the optional unit detecting
OPTV
signal.
High: While connecting optional unit
Input port for [UP] switch (MAIN UNIT; S1).
55 SIDE1
Low: While [UP] switch is pushed.
Outputs strobe signals to the D/A
68 DAST
converter (IC303, pin 6).
I/O port for data signal to the D/A con-
69 DSDA
verter (IC310, pin 6).
Outputs "SPCON" signal.
72 SPCON
Low: Audio output.
Input port for transmitting MSK clock
78 MTCK signal from the base band IC (IC301,
pin 9).
Input port for key matrix.
79 KR Low: While any of key on the 10-keypad
I/O port for the serial data signal for
80 FSDA
the expander (FRONT UNIT; IC2).
Outputs clock signal to the expander
81 FSCL
(FRONT UNIT; IC2).
Input port for [DOWN] switch (MAIN UNIT;
88 SIDE2 S2).
Low: While [DOWN] switch is pushed.
CENC0–
89–91 Output the CTCSS/DTCS signals.
CENC2
Description
to the multiconnector.
(including [P0]–[P3]) is pushed.
Pin Port
number name
92 SIDE3
93 MTDT
94 MDIR
95 MDIO
96 MSCK
97 PMFM
98 ESDA
99 ESCL
100 CODE8 Output port for "CODE8" signal.
4-6-2 D/A CONVERTER (MAIN UNIT; IC303)
Pin Port
number name
2 SQL
3 MOD
10 TENC
11 BAL
14 BEPV
15 SIGNAL
22 TONE
23 REF
4-6-3 D/A CONVERTER (MAIN UNIT; IC310)
Pin Port
number name
1 T1
2 T2
3 TXLVA
4 RXLVA
4 - 6
Description
Input port for [MONITOR] switch (MAIN
UNIT; S4).
Low: While [MONITOR] switch is pushed.
Outputs the MSK data to the base
band IC (IC301, pin 10).
Outputs serial data control signal to
the base band IC (IC301, pin 14 ).
I/O port for the serial data signals
from/to the base band IC (IC301,
pin 11).
Outputs clock signal for the base
band IC (IC301, pin 13).
Outputs the the FM/PM switch (IC302,
pin 11) control signal.
High: While PM is selected.
I/O port for data signals from/to the
EEPROM (IC308, pin 5).
Outputs clock signal to the EEPROM
(IC308, pin 6).
Description
Outputs AF signals to the squelch cir-
cuit (IC3, pin 8).
Outputs modulation signals to the
modulation circuit (D8).
Outputs CTCSS/DTCS signals.
Outputs deviation balance control signal.
Outputs beep audio signals to the
speaker via the AF amplifi er (FRONT
UNIT; IC201).
Outputs AF signals to the speaker via
the AF amplifi ers (FRONT UNIT; IC201).
Outputs single tone signal.
Outputs reference oscillator control signal.
Description
Outputs the bandpass filters (D18,
D19) tuning signal.
• While receiving:
Outputs the bandpass fi lters (D15, D16)
tuning signal.
• While transmitting:
Outputs the TX power control signal
which selects TX output power of HIGH
or LOW. The output signal is applied to
the ALC amplifi er (IC5, pin 1).
Outputs TX VCO lock voltage.
Outputs RX VCO lock voltage.