PARLLEL_TO_SERIAL_CONVERSION

Published:2009/7/11 2:37:00 Author:May | From:SeekIC

Can be used as interface between parallel outputs of keyboard and serial input port of microprocessor. Keyboard output data is fed to 74165 shift register, with eighth input tied low. 7403 gates are connected as mono MVBR for converting keyboard strobe to narrow pulse for loading shfft register. Fourth gate in package serves as output buffer. 555 timer forms clock adjustable from 150 to 1400 Hz, to allow operational standard baud rates of 150, 300, 600, or 1200.-F. J.Greeb, Who Needs a UART?, Kilobaud, Aug.1978, p 108.



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