Port Allocations - Icom IC-F6021 Service Manual

5-5 PORT ALLOCATIONS

5-5-1 CPU (FRONT UNIT; IC1)
Pin Port
No. Name
KR1−
1−3 Input ports for dealer-programmable keys.
KR3
KS0−
4−8 Output ports for dealer-programmable keys.
KS4
Outputs chip-select signal to the attached optional
10 CCS
unit.
19− CENC0−
Output ports for CTCSS/DTCS signal.
21 CENC2
Frequency response of tone filter (FRONT UNIT;
23 DUSE IC5) switching signal.
"Low"=While transmitting.
PTT input from connected microphone.
24 IPTT
"Low"=PTT is pushed.
Microphone on/off hook detect.
25 HANG
"Low"=The microphone is off hook.
Outputs PLL strobe signal to the PLL IC (MAIN UNIT;
30 PLST
IC4, pin 11).
Input port for PLL unlock detect signal from the
34 ULCK PLL IC (MAIN UNIT; IC4, pin 7).
"Low"=While the PLL circuit is unlocked.
Outputs serial data to the D/A converter (MAIN
39 DSDA
UNIT; IC20, pin 6).
Outputs DTMF signals to the LPF (FRONT UNIT;
43 SENC
IC5, pin 3).
Outputs beep sounds to the LPF (FRONT UNIT;
44 BEEP
IC5, pin 7).
45 SDEC Input port for DTMF signals.
46 CDEC Input port for CTCSS/DTCS signals.
48 BATV Input port for power supply voltage.
49 LVIN Input port for VCO lock voltage.
Input port for receive signal strength level signal
50 RSSI
from the IF IC (MAIN UNIT; IC1, pin 12).
Voltage divided by thermal register (MAIN UNIT;
51 TEMP
R209) and R210. (temperature monitor)
[VOL] dial (FRONT UNIT; R14) input. (divided
52 AFVI
voltage of 5V line)
Input port for CPU reset signal from the reset IC
59 RES (FRONT UNIT; IC2, pin 1).
"Low"=When the CPU is reset.
Outputs CPU clock shift signal to the clock
69 CSFT
frequency shift switch (FRONT UNIT; D6).
Outputs strobe signal to the D/A converter (MAIN
71 DAST
UNIT; IC18, pin 7).
• Ignition SW control input.
IGSW/
72 Or
DIM
• Dimmer control input.
Input port for noise signal from the IF IC (MAIN UNIT;
75 NOIS
IC1, pin 13).
79 CLO Cloning data output.
80 CLI Cloning data input.
Outputs serial data to the EEPROM (FRONT UNIT;
82 ESDA
IC3, pin 5).
Outputs clock signal to the EEPROM (FRONT
85 ESCL
UNIT; IC3, pin 6).
Transceiver's power control.
86 PWON
"High"=Power ON.
Outputs serial data to the LCD driver (FRONT UNIT;
91 LSO
IC6, pin 48).
Outputs clock signal to the LCD driver (FRONT UNIT;
92 LSCK
IC6, pin 47).
Outputs chip-enable signal to the LCD driver
93 LCS
(FRONT UNIT; IC6, pin 46).
Outputs display inhibit signal to the LCD driver
94 LINH
(FRONT UNIT; IC6, pin 45).
Outputs LCD backlight control signal to the
backlight LEDs (FRONT UNIT; DS1–9) driver
95 LIGT2
(FRONT UNIT; Q5).
"High"=While the backlight is ON.
Description
Pin Port
No. Name
Outputs serial clock signal to the PLL IC (IC4,
98 SCK pin 9) and D/A converters (IC17, pin 3/IC18, pin 8/
IC20, pin 7).
Outputs serial data to the PLL IC (IC4, pin 9) and D/
99 SO
A converters (IC17, pin 3/IC18, pin 8/IC20, pin 7).
100 KR0 Input ports for dealer-programmable keys.
5-5-2 EXPANDER (MAIN UNIT; IC17)
Pin Line
No. Name
1 EXST Strobe (load enable) input.
2 SO Serial data input.
3 SCK Serial clock input.
4 RXC T8V, R8V lines and RX VCO ON/OFF control.
AF mute SW (Q35) control.
5 AFON
"Low"=Mute
• RX band width switching signal to the 2nd IF
fi lter SW (D56, 57).
"Low"=Narrow mode
6 NWC
• RX band width switching signal to the phase
shifter SW (Q5).
"Low"=Wide mode
Outputs AF mute signal to the analog switch
7 RMUT (IC3, pins 12, 13).
"Low"=While the squelch is close or transmitting.
External device control.
12 HORNO
"Low"=Pin 6 of OPC-1939 (if connected) is "Low."
Outputs transmit mute signal to the transmit
13 TMUT mute switch (Q46).
"High"=Transmitting is muted.
5-5-3 D/A CONVERTER (MAIN UNIT; IC18)
Pin
No.
2, 3 MIC signal level adjustment.
4, 5 RX AF/MIC signal level adjustment.
16, 17 Tone signal level adjustment.
Oscillation frequency control voltage to the reference
18, 19
frequency oscillator (X2).
20, 21 Modulation signal level adjustment.
22, 23 Beep sound loudness adjustment.
24, 25 Squelch threshold level adjustment.
5-5-4 D/A CONVERTER (MAIN UNIT; IC20)
Pin Line
No. Name
• While receiving
Tuning voltage to the tuned BPFs (D4, 21
and D8, 20).
1 T1
• While transmitting
TX power level setting signal to the APC AMP
IC2).
Tuning voltage to the tuned BPFs (D9, D10 and
2 T2
D19).
Oscillation frequency correcting voltage to the TX
3 TLVA
VCO (Q13, D16, 53, 64, 65).
Oscillation frequency correcting voltage to the RX
4 RLVA
VCO (Q14, D33, 52, 62, 63).
5 - 5
Description
Description
Description
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