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PIC 16F84 -- Eh?

Discussion in 'Electronic Components' started by Tim Wescott, Nov 17, 2004.

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  1. Tim Wescott

    Tim Wescott Guest

    Can someone with experience with the part tell me if there are
    sufficient differences between the PIC 16F84 and the 16F84A to cause
    problems during EEPROM write? I have purchased the "A" part for a
    circuit (and software) that calls out the plain-jane version. I'm
    having problems (described below) that are either the thing locking up
    in mid-write or are _really weird_.
  2. Dave Platt

    Dave Platt Guest

    I suggest you go right to the horses's mouth: the 84->84A migration
    guide is at

    It looks to me as if there are some voltage, and timing differences
    involving access to the EEPROM. Dunno whether that's the cause of
    your lockups, though. is the
    16F84A errata document.
  3. Tim Wescott

    Tim Wescott Guest

  4. mike

    mike Guest

    Been a long time since I looked, but as I recall, they inverted the
    sense of one of the pins when they went to A???

    Return address is VALID.
    500MHz Tek DSOscilloscope TDS540 $2200
    Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
    Bunch of stuff For Sale and Wanted at the link below.
  5. Been a long time since I looked, but as I recall, they inverted the
    No, they inverted the meaning of one of the bits in the configuration
    word. IIRC the power-up delay timer.

    Wouter van Ooijen

    -- ------------------------------------
    Webshop for PICs and other electronics
    Teacher electronics and informatics
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