IOFSCS_8MHZ     Hmmm, dyslexia day at Microchip

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Your device line is OK, just pointing out an oddity.
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> how do I figure out what value will get placed in the Vin variable?

1 decimal place ...
Code:
Volts = (Vin+1) */ 50
2 decimals ...
Code:
Volts = (Vin+1) */ 500