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To use INTOSC you have to set the configuration register bits for the internal oscillator. Your PIC programmer will have option for this setting (Its also called FUSE Setting).
If I understand well you want to use internal osilator for 628 working. In this case you have 2 choises: use osc pins as I/O pins or use it as osc out pins.
You can read in PICC manual how to do it, the most simplest way is to
use __CONFIG command.
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