hi, I searched all forums, no answers, so writing this question:
how do you set PINxCTRL I/O register for no pullup or pulldown? table pg 152 does not has "none" as a choice.
for xmega128a4u, AU manual shows I/O configuration for pullup or pulldown, but there is no "none". there is a N/A (not applicable) for totem putput, but I want my adc as analog input.
I have setup ADC4 as digital input disabled. fine.
I read the appnote for xmega I/O, but it skips the choice of "none".
both pdfs ignore the choice for "none".