33.2.1 Starting a Conversion
To enable the ADC module, the ON bit must be set to ‘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 for more details)
Important: The GO bit must not be
            set in the same instruction that turns on the ADC. Refer to the ADC Conversion
                Procedure (Basic Mode) section for more details.
    