It's the calibration of the internal voltage reference for the ADC.
The voltage reference is a "bandgap voltage reference"...

Jan-Erik Svderholm
S:t Anna Data
Sweden


>The 12F PICs have two bandgap calibration bits in the fuses word that
>should be saved/restored by the progranmmer when the chip is erased.
>
>Has anyone found a clue as to what these bits are used for by the chip?
>
>Wouter van Ooijen

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