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MM5369 Replacement with PIC

Discussion in 'Electronic Basics' started by Ian R. Adlon, Jan 8, 2004.

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  1. Ian R. Adlon

    Ian R. Adlon Guest

    I am looking for the code to replace an MM5369 oscillator with a PIC chip
    (possibly something in the 12CXX series). I remember seeing the code on a
    website sometime ago, but I can't find it now. I know elm makes one, but
    I'd rather make it myself. Can anyone help?
     
  2. Why does it have to be a PIC? You can use a crystal oscillator and
    cmos divider chain to get the 60 Hz, 100 Hz, or whatever frequency you
    needed.

    There were different types of the MM5369, with different output
    frequencies.

    I have seen metal can crystal oscillators with a 60 HZ out in some
    VCRs, they are in a round can with two rows of three pins.

    --
    We now return you to our normally scheduled programming.

    Take a look at this little cutie! ;-)
    http://home.earthlink.net/~mike.terrell/photos.html

    Michael A. Terrell
    Central Florida
     
  3. Dan T

    Dan T Guest

    what output frequency you after?, you won't get a real high frequency out of
    a PIC. i've recently finished a big project working with PICs, generating
    wave forms, ...with a external clock frequency of 4MHz, the best output i
    could get was little over 100Hz. Decresing the quality of the output you
    could possibly get it to go a bit faster.
     
  4. Ian R. Adlon

    Ian R. Adlon Guest

    I'm only looking for three outputs: 50Hz, 60Hz, and 1Hz.
     
  5. Well, it's an easy thing for a small PIC as you know.
    YOU should learn how to program a 12C519.

    Use the timer to generate hardware time tics, the units of your frequency
    requirements.
    Use software timers updated by the timer IRQ, to generate the various
    outputs.

    Microchip supplies the assembler free. This is a great learning
    opportunity.
    I won't hand you the code, but I will assist YOU learning.

    Tom
    --
    *
    | __O Thomas C. Sefranek
    |_-\<,_ Amateur Radio Operator: WA1RHP
    (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

    http://hamradio.cmcorp.com/inventory/Inventory.html
    http://www.harvardrepeater.org
     
  6. There is lots of timing code available on www.piclist.com

    If you just need a squarewave output, then a PIC is easy to program, using
    example code from microchip and piclist.

    Regards
     
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