METHOD AND DEVICE FOR DETECTING KEY DEPRESSION

PROBLEM TO BE SOLVED: To provide the detecting method for key depression which is simple and does not require a periodic toggle of processor output. SOLUTION: One of L keys 114 toggles characteristic combinations of at least N out of M inputs 600 when pressed, and the respective characteristic combi...

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Bibliographische Detailangaben
Hauptverfasser:	GARDNER MICHAEL R, LACHIW MARK J, JOHNSON ROBERT M JR
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS BASIC ELECTRONIC CIRCUITRY CALCULATING CODE CONVERSION IN GENERAL CODING COMPUTING COUNTING DECODING ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRIC SWITCHES ELECTRICITY EMERGENCY PROTECTIVE DEVICES PHYSICS RELAYS SELECTORS TELEPHONIC COMMUNICATION TRANSMISSION WIRELESS COMMUNICATIONS NETWORKS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide the detecting method for key depression which is simple and does not require a periodic toggle of processor output. SOLUTION: One of L keys 114 toggles characteristic combinations of at least N out of M inputs 600 when pressed, and the respective characteristic combinations are taken out of all possible combinations. At least M inputs 600 are read by a processor 506 and compared with specific key patterns 806. When there is a match between the M inputs 600 and one of the specific key patterns 806, the key depression is detected and a specific function can be processed in response. The processor 506 can ignore simultaneous key depression where combinations of inputs more than N are toggled.