Icom IC-PCR100 Service Manual

Also see for COMMUNICATION RECEIVER IC PCR100: Instruction manual

Contents

4-4 PORT ALLOCATIONS4-4-1 CPU (IC20) CPU (IC20) — continued4 - 6Input port from WFM IC (IC7, pin 7) forthe stereo indicator.Input ports for the CPU system clockoscillator (X6; 9.8304 MHz).Input port for the reset signal.Outputs power switching circuit controlsignal.High : While turning power ON.Outputs attenuator control signals.Low : When attenuator function isON.Outputs AGC time constant controlsignals.High : While scanning (fastest AGCspeed).Outputs AGC time constant controlsignals.Low : When WFM or FM mode isselected (AGC-fast).Outputs ANL control signals.High : While ANL fuction is ON.(AM mode only)Outputs AF mixing control signal forthe stereo audio.Outputs strobe signals for the outputexpander ICs (IC1, IC3).Outputs data signal for the electronicvolume IC (IC23).Input port for serial signal from theEEPROM IC (IC20).Outputs data signal for the EEPROMIC (IC20) and output expander ICs(IC1, IC3).Outputs clock signal for the EEPROMIC (IC20) and output expander ICs(IC1, IC3).Outputs chip select signal to the EEP-ROM IC (IC20).Outputs 1st LO filter select signals.High : When frequencies from 0.01 to265.699 MHz are displayed.Low : When frequencies from 265.7to 1300.0 MHz are displayed.Outputs VCO1 shift signals.Outputs VCO2 shift signals.18, 91017181920212223, 242526272829343536FMSTOSC1,OSC2RESPOCOATTCSCANAGCSANLSWAFMST1,MST2AFDTMSIMSOMckECSPFL2VSF1VSF2Pin Port Descriptionnumber nameOutput VCO2/VCO1 select signals.Outputs strobe signals for referencefrequency and VXO frequency.Outputs strobe signals for the PLL IC(IC8).Outputs serial data signals for thePLL IC (IC8).Outputs serial clock signal for the PLLIC (IC8).Input port for data signal from theconnected PC via the RS-232C inter-face IC (IC9).Outputs data signal to the connectedPC via the RS-232C interface IC(IC9).Outputs tunable bandpass filter con-trol voltage.Input port for unlock signal from thePLL IC (IC8).Low : PLL unlockInput port signal strength detectionsignal (NOIN; pulse-type).Input port for 1st LO PLL lock voltage.Input port for the CTCSS decodedsignal.Input port for S-meter signal.37, 38394142434849545960616263VCO1,VCO2DST1PSTBPdatPckRXDTXDTUNELCTNOINL1ADCTADSMADPin Port Descriptionnumber nameVCO freq.[MHz]533.40–749.90750.00–1064.70533.40–534.35532.40–533.35534.40–749.95750.00–1066.65533.30–749.95750.00–1033.300Display freq.[MHz]0.01–108.299108.3–265.699265.7–266.699266.7–267.699267.7–483.299483.3–799.999800.0–1016.6991016.7–1300.000SelectedVCOVCO1VCO2VCO1VCO1VCO1VCO2VCO1VCO2