32.2.4 ADC Operation During Sleep

The ADC module can operate during Sleep. This requires the ADC clock source to be set to internal RC oscillator (the CS bit in the ADCON0 register is set to ‘1’). When the F_RC is selected as ADC clock source, the ADC waits one additional instruction before starting the conversion. This allows the SLEEP instruction to be executed, which can reduce system noise during the conversion. If the ADC interrupt is enabled, the device will wake up from Sleep when the conversion completes. If the ADC interrupt is disabled, the ADC module is turned off after the conversion completes, although the ON bit remains set.