Serial keyboard interface system

Details Serial keyboard interface system Serial keyboard interface system

G - Physics

06

F

354/236.5

G06F 3/02 (2006.01) G06F 3/023 (2006.01) G06F 3/03 (2006.01) G06F 11/00 (2006.01) G06F 11/14 (2006.01)

Patent

CA 1205205

SERIAL KEYBOARD INTERFACE SYSTEM ABSTRACT In data processing systems it has been proposed that a keyboard and a data processing unit be interconnected through a data line and a clock line so as to transmit keyboard outcodes bit-serially through the data line and to transmit a keyboard out clock signal through the clock line. This could result in false operation however due to noise being induced in the interconnecting cables from both the data and clock lines resulting in false operation and incorrect data being transmitted. The present invention which provides a serial keyboard interface system overcomes the problem of erroneous transmission of keyboard data due to noise pulses induced in the interconnecting lines. Data signals are generated at the data processing unit indicating whether the correct number of bits of a data frame are counted for the received signal. If incorrect number is received then the status signal which is returned to the keyboard causes a retransmission of the signal.

439560

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