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Sometimes a resistor in series from the programing pins to the application circuit works, sometimes diodes.
The sure fire way is to use a removable jumper to disconnect the programing pins from everything else while programing.
If you are using the PicKit2, the PicKit2 User Guide briefly mentions this.
Dave
Always wear safety glasses while programming.
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Remember that most 12Fs usually have an input only pin (mclr/gp3) but yes with charlieplexing and driving your leds at a higher current / lower pulse width should do the trick.
Anyway if you want more and more outputs, just use a 74HC595 connected to the 12F combined with shiftout command for an unlimited number of them if your timing allows them to refresh
"If at first doesn't work, kicking it wont help either"
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