Erase error

[mark_s]

I had a similar problem. It had to do with setting the MCLR pin as an input and using the internal oscillator. The pic18f45k80 would program once and then block further erases and programming.

Melabs fixed the problem with an update to the Beta software. Send an email to support, they are alway very helpful with these types of problems.

[spcw1234]

I have bricked quite a few 16F627A's before I realized what I was doing wrong. I could program them once, then I could not write or clear them after that. Had to throw them away. It turned out that I was enabling timer 1 external oscillator which was disabling MCLR. I had no way to reset the chip with the programmer I was using, so I couldn't re-program them. Carefully review all your configs for the MCLR pin.