While programming MCLR does not need to be connected to anything but the programmer.
Do you have MCLR configured as an input or reset?
This may also help.
http://www.melabs.com/support/icsp.htm
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While programming MCLR does not need to be connected to anything but the programmer.
Do you have MCLR configured as an input or reset?
This may also help.
http://www.melabs.com/support/icsp.htm
Dave
Always wear safety glasses while programming.
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yes as input.
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And internal oscillator, I suspect.Originally Posted by Macgman2000
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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