The manual comes in French? The data sheet does not always have the info needed. What is the minimum +vref for a 18F2520? After I RTFM I CNFTFA (could not find the 'french' answer). It is possible I may have missed it after looking 3 times. Maybe someone in this group knew. Microchips answer was 1.2v. But at supply voltage? Again CNFTFA.