can't reprogram 12F615

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  1. - 29th March 2013, 19:36 #1
    Max Power's Avatar
    Max Power
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    Default Re: can't reprogram 12F615

    pic is running at 3.3V

    using PBP 2.6C (I know..upgrade!) inside MPlab8.7
  2. - 29th March 2013, 19:47 #2
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    mackrackit
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    Default Re: can't reprogram 12F615

    Are you erasing the chip before re-programming?
    Dave
    Always wear safety glasses while programming.
  3. - 29th March 2013, 19:51 #3
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    Default Re: can't reprogram 12F615

    I hit erase, and it says

    Erasing...
    Erase device complete

    but then I fail a blank check
  4. - 29th March 2013, 21:03 #4
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    Default Re: can't reprogram 12F615

    I think Max Power has a Min Power problem.

    The 12F615 requires a minimum of 4.5V to do a "Bulk Erase".

    melabs programmers have a "Low Voltage Erase" option that can "Row Erase" at lower voltages.
    I'm not sure if you can do that with Microchip programmers.

    If possible, power your circuit with 5V during programming.

    The problem you thought you were having with ICSP pins in output mode only affects chips with MCLR disabled. You have MCLR enabled.
    Last edited by Darrel Taylor; - 29th March 2013 at 21:12.
    DT
  5. - 29th March 2013, 21:22 #5
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    Default Re: can't reprogram 12F615

    Awesome. I think that was it. This board has a 3.3V switching power supply running the micro. I also have a 4.7V zener on the power supply output because I have seen some pretty wicked spikes at startup. I set the pickit3 to power the micro at 4.625V, with the main power disconnected and....
    Programming...
    Programming/Verify complete

    Thanks for your help.. and happy easter!.. I know I will be much happier not having to worry about this anymore!
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