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5. Incorrect Channel Change in Free Running Mode
If the ADC operates in Free Running mode and channels are changed by writing
to ADMUX, shortly after the ADC Interrupt Flag (ADIF in ADCSR) is set, the new
setting in ADMUX may affect the ongoing conversion.
Problem Fix/Workaround
Use Single Conversion mode when scanning channels, or avoid changing ADMUX
util at least 0.5 ADC clock cycles after ADIF goes high.
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