Real use of left and right alignment in ADC For 10 bit adc, if you need all 10 bits you are reading low and high value of conversion result using right alignment. If you need only 8 bits, you use left alignment and take only high value.To explain the use of the ADC, let's look at a basic example taking a single reading. ... ADFM = 1; //ADC result is right justified ADCON0bits. ... to the left by 8 and adding the ADRESL.If we do not wait at least 5us, the reading will be lower than the actual voltage applied to the pin.