I See,

OK LEONARDO,

LIKE MELANIE SAID. DOWNLOAD THE DATASHEET FROM MICROCHIP WEBSITE.
HTTP://WWW.MICROCHIP.COM/stellent/id...cName=en010236

THEN READ
DATASHEET REGISTER SECTION 11-2, ADCON1 REGISTER, NOTE TABLE FOR BITS 3:0.

AND

DATASHEET REGISTER SECITION 12-1, CMCON REGISTER, SEE TABLE FIGURE 12-1

OH, AND WHILE YOU'RE AT IT. WHY NOT BUY A COPY OF PICBASIC PRO.
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Maybe that was too loud. Oops!