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Newbie question about 500khz & 555

Discussion in 'Electronic Basics' started by Joe Plane, Oct 21, 2003.

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  1. Joe Plane

    Joe Plane Guest

    Ahh forgive the newbie jargon 'bring me up to speed' question. Do you
    mean by bit banging assigning a pin on the 8051 to be the 'clock' and
    then manually setting it to 0 and 1 at the appropriate frequency (or
    just about).

    Many thanks,
  2. Just a counter. Eg. 74HC4040 or 74HC161. Look up the data sheets.
    No, an external counter chip.
    Really hardware dependent. Some micros have peripherals on board that
    can support that sort of thing, even at that relatively high clock
    speed, but it consumes those resources and they can't be used for
    anything else. You'd have to look carefully at the micro data sheet
    and see if you can do it.

    My suggestion is more general and doesn't make any assumptions or use
    any microcontroller resources, not even a single pin, but it requires
    external hardware (one chip).

    Best regards,
    Spehro Pefhany
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