Polaroid IC-V8000 service manual Port Allocations, CPU Logic Unit IC7

4-5	PORT ALLOCATIONS
4-5-1 CPU (LOGIC UNIT: IC7)
Pin		Port		Description
number		name
1		DETO	Input port for the weather alert signal
			detection.
9		RESET	Input port for reset signal.
11		CSHIFT	Outputs reference		oscillator	for	the
			CPU control signal.
			Outputs serial clock signal to the
12		SCK	expander IC (MAIN unit; IC2, pin 3),
			D/A convertor IC (MAIN unit, IC5, pin
			7), etc.
14		SO	Outputs serial signals to the D/A con-
			vertor IC (MAIN unit; IC5, pin 8),etc.
15		PTT	Input port for the [PTT] switch.
			High : While [PTT] switch is pushed.
16		CLIN	Input port for the cloning signal.
17		CLOUT	Outputs the cloning signal.
19		NOIS	Input port	for noise signals (pulse
			type).
			Outputs LCD back light color control
20		COLOR	signal.
			Low : While choosing umber color.
21		DIM1	Outputs LCD contrast control signal.
22		DIM0
			Input port for the remote signals from
23		REMO	a remote microphone (HM-133V) via
			the [MIC] jack.
26		UNLK	Input port for PLL unlock signal from
			the PLL IC (MAIN unit; IC1, pin 14).
32–35		COM4–	Outputs LCD common signals.
		COM1
36–39		KR3–	Input port for initial matrix.
		KR0	Low : While keys are pushing.
			Input port for the remote control micro-
40		EXTMIC	phone (HM-133V) connecting detec-
			tion.
			Low : While HM-133V is connected.
41		OPV2	Input port for the optional unit detec-
			tion signal.
44		PLLSTB	Outputs strobe signals to the PLL IC
			(IC1, pin 4).
45		PLLCK	Outputs PLL IC (IC1, pin 2) clock sig-
			nal.
			• Outputs	strobe	signal	to	the
47		EXSTB	expander IC (IC2, pin 1).
		OPV3	• Input port for the optional unit detec-
			tion signal.
49–51		OPT1–	I/O port for optional unit control signal.
		OPT3
			Outputs low-pass filter cut-off frequen-
53		DUSE	cy control signal when DTCS is acti-
			vated.

Pin	Port	Description
number	name
54	ESCK	Outputs EEPROM (LOGIC unit; IC5,
		pin 6) clock signal.
55	ESDA	I/O port for the data signals from/to the
		EEPROM (LOGIC unit; IC5, pin 5).
56–88	SEG1–	Output LCD driver signals.
	SEG32
90	CTCC	Outputs CTCSS and DTCS tone sig-
		nal.
91	TONE	Outputs DTMF, BEEP and 1750 Hz
		tone signal.
95	SQLV	Input port for the squelch level detec-
		tion.
		Input port for the microphone up/down
96	MICUD	signal while connecting the micro-
		phone.
97	SD	Input port for the RSSI detection.
98	LVIN	Input port for the PLL lock voltage.
99	PDET	Input port for the power detector volt-
		age.
100	TEMP	Input port for the transceiver’s internal
		tempareture detection.

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