@Rufus
You made my sleep good
It was default AN12 A/D input.
It was ~1 A.M when I finish my fight with this, and start this thread.
When you post your response (got smartphone ring) I thought damn why I wasn't got this.
I walk to my lab, launch MPLAB and check - it worked, check datascheet where is it written with * on bottom of one pages :/
Thanks
@dannyf
I tested with and without low_priority, and enabled prioritizing interrupts - stil not working. It was default pin mode ..