PB728PB627PB526PB425PB324PA1523PA1422PA1321PA10[PA12]20PA9[PA11]19VDDIO218VDD17VSS16PB115PB014PA713PA612PA511PA410PA39PA28PA17PA06VDDA5NRST4PF1-OSC_OUT3PF0-OSC_IN2PB8-BOOT01