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Need baud rate generator circuit for an 8251 USART

Discussion in 'Electronic Basics' started by Commander Dave, Dec 16, 2003.

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  1. Hello again all,

    This is really a repost of the thread "Adding Serial I/O on a vintage Z80
    system", but thought being specific in the title might get me an answer. I
    didn't realize that finding a schematic with parts for a serial port would
    be so problematic. :p

    What I need:

    I have an old schematic of a complete serial port using an 8251, but the
    only piece missing is the baud rate generator clocks. I have received
    general information on how to make one, but I need some actual schematics
    and parts list (my electronics training hasn't got to crystals and such

    My baud rate requirement is modest as it will just be driving a terminal on
    a 1.78 MHz Z80 type system. 9600 baud would be plenty.

    I have posted the schematic that I have for the serial port to
    alt.binaries.schematics.electronic, so if you would like to see what I want
    to build, just check out that posting. It will be the same title as this

    Thank you all for your help,
    -Commander Dave
  2. KD5VMF


    Jan 16, 2009
    Baud rate generator.

    Try this circuit.

    Attached Files:

    • BAUD.jpg
      File size:
      82.6 KB
    Last edited: Jan 16, 2009
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