I have looked at the datasheet for the 10F206 and I see that the  
internal voltage reference can vary from 0.55 V to 0.65 V.

Is the internal voltage reference stable at whatever value it happens  
to be ?  In other words, can I calibrate each PIC10F206 by measuring  
it's internal reference value, recording it in Flash and expect it to  
remain stable ?
I did not see a listed variance per degree Centigrade for the internal  
reference.
If I were to charge a capacitor through a variable resistor would I be  
able to determine the value of the variable resistance by discharging  
the capacitor using the PIC comparator pin and then switch to  
measuring the external voltage using the comparator ?  The charge time  
of the cap to reach the same voltage as the internal resistance would  
determine the variable resistance.  Is this impractical if I wanted 8  
bits of accuracy ?  How about 6 bits of accuracy ?

Best
Gus
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