Icom IC-F3GT Service Manual
Also see for IC-F3GS: Instruction manualInstruction manualInstruction manualUser manualService manual
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4 - 44-5 PORT ALLOCATIONS4-5-1 CPU (IC8)Pinnumber19111215161718192136–3844–474950515253545556575859PortnameVINRESETCSIFTSCKDASTCLINCLOUTPLSTNOISBUSYOPV3–OPV1KR3–KR0RMUTMMUTDUSES5CR5CT5CTXCAFONLIGTESCKESDADescriptionInput port for battely voltage detection.Input port for RESET signal.Outputs reference oscillator for theCPU control signal.Outputs clock signal to the PLL IC(IC1), EEPROM (IC7), etc.• Outputs strobe signals to theexpander IC (IC10, pin 6).• Input port for the initial version sig-nal.Input port for the cloning signal.Outputs the cloning signal.Outputs strobe signals to the PLL IC(IC1, pin 3).Input for for noise signals (pulse type).Outputs BUSY detection.Low: The channel is busy.Input port for the optional unit detec-tion signal from J5.Output ports for key matrix.Low: When the key is pushed.• Outputs RX mute control signal.• Input port for the RX mute signalfrom optional units.• Output TX mute control signal.• Input port for the TX mute signalfrom optional units.Outputs low-pass filter cut-off frequen-cy control signal when DTCS is acti-vated.Outputs S5 regulator control signal.Low: While power is ON.Outputs R5 regulator control signal.Low: While receiving.Outputs T5 regulator control signal.Low: While transmitting.Outputs APC circuit control signal.High: While transmitting.Outputs control signal for the regulatorcircuit of AF power amplifier.High: When squelch is open, etc.Outputs LCD backlight control signal.High: Lights ON.Outputs EEPROM (IC7, pin 6) clocksignal.I/O port for data signals from/to EEP-ROM (IC7, pin 5)Pinnumber639091949596979899100PortnameUNLKMTONEDTMFCTCINPTT0BDETREM0SDLVINTEMPDescriptionInput port for unlock signal.High: PLL is unlocked.Low: PLL is locked.Output port for:Beep audio while receiving.2/5-tone signals while transmitting.Outputs DTMF tone signal while trans-mitting.CTCSS/DTCS signals input port fordecording.Input port for the [PTT] switch.High: While [PTT] switch is pushed.Input port for the battery’s type detec-tion.Input port for the remote-control signalfrom external MIC (HM-75).Input port for the RSSI detection.Input port for the PLL lock voltage.Input port for the transceiver’s internaltemperature detection.4-5-2 OUTPUT EXPANDER IC (IC10)Pinnumber2, 3,10, 1167PortnameT1–T4DASTSCKDescriptionOutput tunable bandpass filter controlsignals.Input port for strobe signal from theCPU (IC8, pin 15).Input port for clock signal from theCPU (IC8, pin 12).CPU (IC8)–continued |
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