Quote Originally Posted by modifyit
I just got a note back from MELabs stating that you can not reliably program the 12F675 when using both MCLR as an input and the internal oscillator.

I guess I will try making the MCLR as a reset pin later and see if another chip bites the dust.

I repeat...

<<If your code is evolving, you really should keep MCLR as a reset. The last programming action will be to flip the config fuse for the MCLR pin to become an input.>>