Icom IC-F7000 service manual Front CPU Port Allocations RC-26, Display Board IC8201

4-6-7 FRONT CPU PORT ALLOCATIONS (RC-26, DISPLAY BOARD; IC8201)

Pin	Port					Description
number	name
			CS
15–17		WR		Outputs LCD drive signals.
			RD
21	CALK			Input port for the [CALL] switch.
				Low: [CALL] switch is pushed.
22	UPK			Input port for the [∫] switch.
				Low: [∫] switch is pushed.
23	UNK			Input port for the [√] switch.
				Low: [√] switch is pushed.
24	SELA			Input port for the select dial A signal.
25	SELB			Input port for the select dial B signal.
				Input port for the [POWER] switch
27	PCON			detection signal.
				Low: [POWER] switch is pushed.
28		IOK		Input port for the [I/O] switch.
31	MUDK			Input port	for [∫], [√] switches from
				the microphone (HM-143).
32	MPTT			Input port for the [PTT] switch from the
				microphone connector (J8701, pin 5).
				Outputs LCD back light dimmer con-
				trol signal.
				Dimmer		Brightness	Voltage
37	DIM					0 (dark)	0 V
				ON		1	0.8 V
						to	to
						10 (bright)	3.6 V
				OFF			5.6 V
39	ETXD			Outputs cloning data.
40	ERXD			Input port for cloning data.
48	SCNK			Input port for the [SCAN] switch
				Low: [SCAN] switch is pushed.
49	TUNK			Input port for the [TUNE] switch
				Low: [TUNE] switch is pushed.
50	MUTK			Input port for the [MUTE] switch
				Low: [MUTE] switch is pushed.
51	EMGK			Input port for the [EMG] switch
				Low: [EMG] switch is pushed.
52	TRK			Input port for the [← ] switch
				Low: [← ] switch is pushed.
53	TLK			Input port for the [→ ] switch
				Low: [→ ] switch is pushed.
54	T0K			Input port for the [0] switch
				Low: [0] switch is pushed.
55	T9K			Input port for the [9] switch.
				Low: [9] switch is pushed.
57	T8K			Input port for the [8] switch.
				Low: [8] switch is pushed.

Pin	Port	Description
number	name
58	T7K	Input port for the [7] switch.
		Low: [7] switch is pushed.
59	T6K	Input port for the [6] switch.
		Low: [6] switch is pushed.
60	T5K	Input port for the [5] switch.
		Low: [5] switch is pushed.
61	T4K	Input port for the [4] switch.
		Low: [4] switch is pushed.
62	T3K	Input port for the [3] switch.
		Low: [3] switch is pushed.
63	T2K	Input port for the [2] switch.
		Low: [2] switch is pushed.
64	T1K	Input port for the [1] switch.
		Low: [1] switch is pushed.
65–72	DB0–DB7	I/O ports for LCD driver control sig-
		nals.
		Outputs resistor select signal for the
74	RS	LCD driver.
		High: Index resistor is selected.
		Low: Data resistor is selected.
75	RES	Outputs reset signal for the LCD driver.
		Low: The LCD driver is reseted.
		Outputs mic gain select signal.
		High: Capacitor microphone is
76	MSEL	selected.
		Low: Moving-conductor microphone
		is selected.
		Outputs microphone key back light
77	MBKS	control signal.
		Low: Lights ON.

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