2.3.1 ADC MUX Selection and Accumulation Number has Delayed Update When Initialization Delay is Used
If the initialization delay (INITDLY in ADCn.CTRLD register) is non-zero, an update of ADC MUX Selection (ADCn.MUXPOS or ADCn.MUXNEG) or Sample Accumulation Number (ADCn.CTRLB) after enabling ADC or changing reference selection will not take effect until one ADC measurement is completed.
Work Around
Perform one of the following:
Change ADC MUX selection (ADCn.MUXPOS or ADCn.MUXNEG) and Sample Accumulation Numbers (ADCn.CTRLB) before enabling the ADC or changing the reference selection.
Perform a dummy conversion after enabling the ADC or changing reference selection.
Affected Silicon Revisions
Rev. A3
Rev. A4
Rev. A6
X
X
X
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