PC14-OSC32_IN1PC15-OSC32_OUT2NRST3VSSA4VDDA5PA06PA17PA28PA39PA410PA511PA612PA713PB014PB115VSS16VDD17PA818PA919PA1020PA1121PA1222PA1323VDDIO224PA1425PB426PB527PB628PB729BOOT030VSS31VDD32VSS33