Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 22, 2006
Patent Application Number
10600845
Date Filed
June 23, 2003
Patent Citations Received
Patent Primary Examiner
Patent abstract
An apparatus for data input. The apparatus comprises a sensing circuit for a plurality of keys, outputting an interruption signal and a corresponding group of data bits when one of the keys is pressed, a shift register circuit receiving a strobe signal, a clock signal and the group of data bits in parallel from the sensing circuit when the strobe signal is asserted, and serially outputting the group of data bits in synchronization with the clock signal, and a microcontroller receiving the interruption signal, outputting the strobe signal and clock signal when the interruption signal is asserted, and serially receiving the group of data bits from the shift register circuit to identify the key being pressed.
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