12F509 / 609 ICSP problems


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  1. #1


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    yes as input.

  2. #2
    Join Date
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    Quote Originally Posted by Macgman2000 View Post
    yes as input.
    And internal oscillator, I suspect.

    In which case, vpp-before-vdd is the only option that can resurrect the chip.

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    OK I got it to work. Had to use pin#4 on the USB programmer header, not external power. It supplies switched vdd to the mcu. I assumed that it takes into account the unique programming cadence for the 12F. I assumed correct, thanks all!

    Nick

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