32.2.1 Starting a Conversion
To enable the ADC module, the ON bit
         in the ADCON0 register must be set to a ‘1’. A conversion may be started
         by any of the following:
- Software setting the GO bit to ‘1’
- An external trigger (source selected by ADACT)
- A Continuous-mode retrigger (see the “Continuous Sampling mode” section)
.
Important: The GO bit must not be
         set in the same instruction that turns on the ADC.
   