Greetings,

I've seen somewere on the internet that someone after programing a pic the programmer could no longer recognize the pic ( burning only with that specific code).

From what i understood it was something about using the internal oscilator and MCLR getting a state where the programmer could not access programming mode.

My question is:

Are you guys familiar with this issue ?

How can this happen and how can it be avoidable ?

Thanks in advance

RJC