PC02PC13PC24PC35PF0(XTAL32K1)16PF1(XTAL32K2)17PF6(RESET#)18PF7(UPDI)19PD17PD28PD39PD410PD511PD612PD713GND21GND15PA71PA628PA527PA426PA325PA224PA1(XTALHF2)23PA0(XTALHF1)22VDDIO26VDD20VDD14