1.1.4 ADC GO Bit May Remain Set When the Clock Source is FOSC

When using FOSC as the clock source (ADCON0.CS = 0) and any clock divider setting other than FOSC/2 is selected, the ADGO bit remains set and the conversion does not complete.

Work around

Method 1:

When using FOSC as the clock source (ADCON0.CS = 0), clear the ADCLK register value to zero (ADCLK.CS = 0) and ensure that the FOSC frequency does not violate any timing requirements for the ADC.

Method 2:

Use ADCRC as the clock source (ADCON0.CS = 1).

Affected Silicon Revisions

A3A4
XX