PIC18F got some weird problem?

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  1. - 17th February 2007, 18:17 #1
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    Without the whole code and schematic it's hard to say...
    Stack-Overflow reset?
    Faulty MCLR contact?
    BAD config fuses programming (LVP_ON could do some strange thing sometimes)
    messy supply line may cause some BOD reset as well
    etc etc etc

    To me scoping the VDD rail to see if it's clean and monitor the MCLR pin would be my first test...

    Well, you could still use CCS to see if the results are the same It have to be!
    Last edited by mister_e; - 17th February 2007 at 18:19.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  2. - 17th February 2007, 18:24 #2
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    Default so..

    So,you belive this problem nothing to do with the EPIC programmer nor the software,that would be PBP version 2.47.My first thought is that the problem might come from the EPIC programmer as it was stated in the melabs website recommending a 0.1 uf cap between the power line?.Is that really neccessary?.I don't face any problem with the programming.So it's 50-50 in my mind.

    Actually , i made this circuit in perf board(donut board) or point-to-point soldering board with 16mhz crystal and a 4.7k pull-up for mclr.That's all.
  3. - 17th February 2007, 18:29 #3
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    it's not a PBP problem.. it's working here on an EasyPIC 4 board.

    Is this a EPIC problem.. maybe, i don't have it. And yup the Cap while programming should help. And yup always plae one close to your PIC and, at least, close to all other IC. I always place a 10uF tantalum close to the PIC too.

    Which capacitor value did you use around your crystal?
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  4. - 17th February 2007, 18:33 #4
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    Default thats..

    I use 22pf npo 7 grade cap.Mmm..it's fine..

    Hey,you mentioned about the stack overflow right.Mmmm..Does that always come in a way to this sort of problem.I don't think so.I always set LVP off as this is not the "J" type PIC.
  5. - 17th February 2007, 18:42 #5
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    F... weird. Did you also erase the PIC before programming it?

    Once programmed, read it back, and look the config fuses haven't change to something else.

    There's some days like that...

    Did you also tried to program your PIC in circuit?

    I always set LVP off as this is not the "J" type PIC.
    Sorry but it has nothing to do with the J type... or, HEHE i misunderstood something awhile back
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  6. - 18th February 2007, 14:58 #6
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    Do you leave the Epic plugged into the board.

    With mine, if I turn on a fluorescent light nearby, it'll reset the PIC.
    If it's unplugged, it doesn't happen. But normally I just leave it plugged in and ignore the resets.

    Also had a screen saver that does something to the parallel port when it activates. It resets the pic too. Stopped using that screen saver.
    <br>
    DT
  7. - 18th February 2007, 15:02 #7
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    I already heard some strange stuff... but a screen saver that poll the parallel port

    So their XP printer polling PATCH didn't solved the problem?
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
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