Power-saving system for a scanned keyboard connected to a...

Details Power-saving system for a scanned keyboard connected to a... Power-saving system for a scanned keyboard connected to a...

H - Electricity

03

M

340/175, 354/236

H03M 11/00 (2006.01)

Patent

CA 1202402

ABSTRACT The identity of a key in a scanned keyboard is deter- mined by the time during the scanning cycle that a particular depressed matrix key location is scanned. The processing circuit, commonly a microprocessor with associated memory elements, is connected to the scanned keyboard conventionally to identify the scanned key. The memory means which are employed have a low power inactive state. The scanned keyboard will be in a low power state as long as no keys of the keyboard are depressed. As long as any of the keys are depressed, however, a gate controls a power safe flip-flop which activates the memory, bringing them to a high power state and the memories remain in the high power state until the processor has completed its processing cycle at which time the processor triggers the flip-flop so that the memories are again allowed to go to their inactive state, thereby achieving a sub- stantial reduction of power in the keyboard which nevertheless remains available for instant activation.

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