> Dear colleagues,
>
>         It's the first time that I program a PIC microcontroller and I'm
> experiencing a little problem. I'm working with a UV erasable PIC12C508
> and so far I erased the device correctly. The calibration value for the
> internal oscillator was obviously erased, but I don't know how to
> reprogram this value. I have a document (DS40139D) downloaded from the
> Microchip Web Page and it says that "the calibration value must be read
> prior to erasing the part, so it can be reprogrammed correctly later". I
> read the value that was pre-programmed, but there isn't any kind of
> information about reprogramming this calibration value.
>         Could someone help me with this problem? It's fundamental to me this
> calibration value because I'm using the internal oscillator.
>         Regards,
>
You need at the end of your code
ORG     1FFH            ;assuming '508
        movlw   xx      ;where xx is the CAL value you wrote down
For OTP parts the above has already been done by MChip.