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Defect in Intel 8254 ..?

Discussion in 'Electronic Design' started by [email protected], Jul 24, 2007.

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  1. Guest

    I built some hw construction with Intel 8254 Interval Timer some years ago and
    it seemed one of the counters could not count to certain values or in certain
    modes. Not mentioned in the datasheet at all.
    Is there a known defect with Intel 8254 ..?
  2. James Arthur

    James Arthur Guest

    I'm a little fuzzy, but yes, I had these problems (22 years ago!).
    Something to do with a) missing the first count when used as a
    counter, and b) not being able to divide by 2(??).

    Also, different in these respects when compared to the 8253, and
    something hinky lurks in my memory about the 82c54 being slightly
    different again...

    Anyway, I figured out workarounds that allowed me to use the 82c54
    such as it was, after a great deal of cursing! So, it's possible.

    James Arthur
  3. Joel Kolstad

    Joel Kolstad Guest

    Compare to the AMD 9513, which has various useful additional features *not*
    described in the data sheets? :)

    In many ways life became much more interesting when FPGAs/CPLDs became cheap
    and you could build any "weird" sort of counter/timer without having to play
    funny games with the standard ICs. (I remember a co-worker commenting that
    the Intel 8096 microcontroller had a timer/counter that was *exactly* what you
    wanted if you were building a controller for the fuel injection on a V8
    engine! If not, well... it was nowhere near as useful...)
  4. Several. Check out
  5. Guest

  6. Guest

    It does for me. Remove the final period.

  7. James Arthur

    James Arthur Guest

  8. Rich Grise

    Rich Grise Guest

    You might have to strip the angle bracket(s) at the front and the
    period at the end. (when I do that, the link works for me.)

    Good Luck!
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