PC14-OSC32_N1PC15-OSC32_OUT2NRST3VSSA4VDDA5PA06PA17PA28PA39PA410PA511PA612PA713PB014PB115VSS16VDD17PA818PA919P1020PA1121PA1222PA1323VDD_USB24PA1425PB426PB527PB628PB729BOOT030VSS31VDD32EP33