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Programmer for HC705P6A

Discussion in 'Electronic Design' started by EnigmaPaul, Nov 9, 2007.

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  1. EnigmaPaul

    EnigmaPaul Guest

    Hi Guys,

    I am using a lot of old HC705P6A devices but my programmer died and
    its not available any longer. Does anyone have, or know where I can
    get a cost effective programmer for this microcontroller?


  2. John Fields

    John Fields Guest

    Depends on what you consider cost-effective, but here's a start:

    There's also a pretty good definition of the programming algorithm
    in the data book, so if push comes to shove and you have to build
    one, and you don't have the data book, it's here:

    as is:

    AN499 Let the MC68HC705 Program Itself.
  3. It's on the menu of my eetools ChipMAX2.
  4. Piglit

    Piglit Guest

    A Needhams EMP20 (with a #9 family board) will do it, and these are
    cheap on the secondhand market (Ebay etc).
  5. EnigmaPaul

    EnigmaPaul Guest


    Does anyone know where I might find an EMP20 programmer and adapter? I
    looked on ebay and there is none there now.


  6. John Fields

    John Fields Guest


    Also, from:

    "Summarize what you're following up.

    When you click "Reply" under "show options" to follow up an existing
    article, Google Groups includes the full article in quotes, with the
    cursor at the top of the article. Tempting though it is to just
    typing your message, please STOP and do two things first.
    Look at the quoted text and remove parts that are irrelevant.
    Then, go to the BOTTOM of the article and start typing there.
    Doing this makes it much easier for your readers to get through your
    post. They'll have a reminder of the relevant text before your
    comment, but won't have to re-read the entire article.
    And if your reply appears on a site before the original article
    they'll get the gist of what you're talking about."
  7. CBFalconer

    CBFalconer Guest

    EnigmaPaul wrote: ** and top-posted. Fixed **
    Ebay is not a fixed menu. Keep looking.

    Please do not top-post. Your answer belongs after (or intermixed
    with) the quoted material to which you reply, after snipping all
    irrelevant material. I fixed this one. See the following links:

    <> (taming google)
    <> (newusers)
  8. JosephKK

    JosephKK Guest

    EnigmaPaul posted to
    I suppose that you could go to the vendor Needham's Electronics.
  9. John Fields

    John Fields Guest

  10. Piglit

    Piglit Guest

    They still sell the family boards and have downloads for the software.
    The OP wants cheap. If that constraint was not there, Needhams sell
    the successor device, the EMP30 which I'm sure is up to the job.
    Needhams are an impressive company - when I bought an EMP20
    (around 15 years ago) and found a chip that it wouldn't burn, I
    them and a few days later they sent me revised software. If you phone
    them you get someone who KNOWS what you are talking about. *RARE*
  11. I am using a lot of old HC705P6A devices but my programmer died and
    Datasheet 1996, chapter 10:
    they have a circuit 68HC705P6A + 2764 EPROM + 74HC4040 Counter
    that boots from the master-2764.
    It does program/verify or only verify.
    Using several manual switches its awkward and certainly not intended
    for production. But with relays and some external controller one could
    get it more comfortable.

    MfG JRD
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