Sharp R-1481, R-1480, R-1482 service manual Segment data signals, Key strobe signal

R-1480

R-1481

R-1482

Pin No.	Signal	I/O			Description
41-44	P17-P14	OUT	Digit selection signal.
			Signal similar to P23.
45-48	P13-P10	OUT	Segment data signals.
			The relation between signals and indicators are as follows:
			Signal	Segment	Signal	Segment
			P13	P15	P03	P7
			...............P12		................P02		ß(60Hz)
			P11	P13	P01	P5
			P10	P12	P00	P4		GND
			P07	P11	P37	P3		VP
			P06	P10	P36	P2
			P05	P9	P35	P1
			P04	P8
			(ß : INTO signal)
			Refer to the touch control panel circuit about the relation between signals and indicators.
			Normally, one pulse is output in every synchronized signal (ß) period, and input to the
			anode of the fluorescent display.
49	P07	OUT	Segment data signal.		Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G8 line keys on key matrix is touched.
50	P06	OUT	Segment data signal.		Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G7 line keys on key matrix is touched.
51	P05	OUT	Segment data signal.		Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G6 line keys on key matrix is touched.
52	P04	OUT	Segment data signal.		Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G5 line keys on key matrix is touched.
53	P04	OUT	Segment data signal.		Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G4 line keys on key matrix is touched.
54	P02	OUT	Segment data signal.		Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G3 line keys on key matrix is touched.
55	P01	OUT	Segment data signal.		Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G2 line keys on key matrix is touched.
56	P00	OUT	Segment data signal.
			Signal similar to P13.
			Key strobe signal.
			Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
			of G1 line keys on key matrix is touched.
57-59	P37-P35	OUT	Segment data signal.		Signal similar to P13.
60-64	P34-P30	OUT	Terminal not used.

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