Icom IC-F3022T, IC-F3023S, IC-F3022S, IC-F3021S, IC-F3021T, IC-F3023T Port Allocations, CPU IC22

5-5 PORT ALLOCATIONS

5-5-1 CPU (IC22)

Pin	Port	Description
No.	Name
1−3	KR1−	Input ports for dealer-programmable keys.
	KR3
4−8	KS0−	Output ports for dealer-programmable keys.
	KS4
9	BUSY	Outputs “BUSY” signal to the DSP UNIT.
10	CCS	Outputs chip-select signal to the DSP UNIT.
11	SCK	Outputs serial clock signal to the PLL IC (IC2, pin 9)
		and D/A converter (IC12, pin 7/IC23, pin 7).
19−	CENC0−	Output ports for CTCSS/DTCS signal.
21	CENC2
		Outputs S5V line control signal to the S5V
22	S5C	regurator (Q23).
		“Low”=While power save mode.
		Outputs T5V line control signal to the T5V line
26	T5C	regurator (Q24, Q49).
		“Low”=While transmitting.
		Outputs R5V line control signal to the R5V line
27	R5C	regurator (Q25).
		“Low”=While receiving.
31	PLST	Outputs PLL strobe signal to the PLL IC (IC2, pin 11).
		Input port for PLL unlock detect signal from the
34	ULCK	PLL IC (IC2, pin 7).
		“Low”=While the PLL circuit is unlocked.
		Outputs transmit mute signal to the transmit mute
35	TMUT	switch (Q46).
		“High”=Transmitting is muted.
36	MONI	Input port for [SIDE1] key (S5).
		“Low”=While the key is pushed.
37	EMER	Input port for top switch (S1).
		“Low”=While the switch is pushed.
39	DSDA	Outputs serial data to the D/A converter (IC23, pin 6).
43	SENC	Outputs DTMF signals to the LPF (IC6, pin 3).
44	BEEP	Outputs beep sounds to the D/A converter (IC12,
		pin 21).
45	SDEC	Input port for DTMF signals.
46	CDEC	Input port for CTCSS/DTCS signals.
48	BATV	Input port for remaining battery power.
49	LVIN	Input port for VCO lock voltage.
50	RSSI	Input port for receive signal strength level signal
		from the FM IF IC (IC9, pin 12).
		Input port for CPU reset signal from the reset IC
59	RES	(IC8, pin 1).
		“Low”=When the CPU is reset.
69	CSFT	Outputs CPU clock shift signal to the clock shift
		switch (D6).
		Outputs AF power amplifi er (IC15) control signal to
70	AFON	the AF power amplifi er controller (Q41, Q42, D21,
		D23).
		“High”=The AF power amplifi er is ON.
71	DAST	Outputs strobe signal to the D/A converter (IC12,
		pin 6).
		Outputs CTCSS/DTCS select signal to the tone
72	DUSE	fi lter switch (Q40).
		“High”=While DTCS is in use.
75	NOIS	Input port for noise signal from the FM IF IC (IC9,
		pin 13).
82	ESDA	Outputs serial data to the EEPROM (IC10, pin 5).
85	ESCL	Outputs clock signal to the EEPROM (IC10, pin 6).

Pin	Port	Description
No.	Name
		Outputs Analog/Digital select signal to the A/D
89	DIGI	switch (D2, D3).
		“High”=Digital mode is selected.
91	LSO	Outputs serial data to the LCD driver (IC20, pin 48).
92	LSCK	Outputs clock signal to the LCD driver (IC20, pin 47).
93	LCS	Outputs chip-enable signal to the LCD driver (IC20,
		pin 46).
94	LINH	Outputs display inhibit signal to the LCD driver
		(IC20, pin 45).
		Outputs LCD backlight control signal to the
95	LIGT	backlight LED’s (DS1, DS2) driver (Q45).
		“Low”=While the backlight is ON.
		Outputs AF mute signal to the analog switch (IC3,
96	RMUTE	pins 12, 13).
		“Low”=While the squelch is close or transmitting.
		Outputs MIC signals mute signal to the analog
97	MMUTE	switch (IC3, pin 5) and MIC mute switch (Q31).
		“Low”=While receiving.
99	SSO	Outputs serial data to the PLL IC (IC2, 10) and D/A
		converter (IC12, pin 8).
100	KR0	Input ports for dealer-programmable keys.

5-5-2 D/A CONVERTER (IC12)

Pin	Port	Description
No.	Name
2	MCGO	Outputs level-adjusted MIC signals to the MIC mute
		switch (Q31).
10,	MOD	Outputs modulation signal to the modulation circuits
16		(D2).
14	REF	Outputs reference frequency control voltage to the
		reference frequency oscillator buffer (IC7, pin 13).
15	BAL	Outputs modulation balance control signal to the
		reference frequency oscillator buffer (IC7, pin 12).
22	BEEPO	Outputs beep sounds to the AF volume buffer (IC6,
		pin 9).
23	SQLC	Outputs level-adjusted AF signals to the noise filter
		(IC9, pins 7, 8, R42, R44−R46, C69, C70, C413).

5-5-3 D/A CONVERTER (IC23)

Pin	Port	Description
No.	Name
		• While receiving
		Outputs BPF tuning voltage to the tunable BPF
1	T1	(D19, D25, L7, L8, C21−C23, C25, C27−C29).
		• While transmitting (as “APC” signal)
		Outputs transmit mute signal to the transmit mute
		switch (Q46).
		Outputs BPF tuning voltage to the tunable BPF
2	T2	(D14, D15, L9, L11, C19, C36, C39−C41,
		C44, C45).
3	TXLVA	Outputs oscillating frequency adjust voltage to the
		TX VCO (Q16, D10, D13).
4	RXLVA	Outputs oscillating frequency adjust voltage to the
		RX VCO (Q17, D9, D11).

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