how to reprogram 12f675 and 12f629 ?

[iw2fvo]

thanks Richard,
Are you saying I have to remove the power to the PIC (target ) and supply it from the PICKIT only ?
I forgot to tell that if I connect a brand new pic12f675 everything goes well ...
Thanks again.
Bye,
Ambro

[richard]

Are you saying I have to remove the power to the PIC (target ) and supply it from the PICKIT only ?

there is no other way to get the chip into prg mode if the mclr pin is assigned as an input pin

I forgot to tell that if I connect a brand new pic12f675 everything goes well ...

a new chip has a mclr pin