1PC0,PC0 2PC1,PC1 3PC2,PC2 4PC3,PC3 5PC4,PC4 6PC5,PC5 7PC6,PC6 8PC7,PC7 9PC8,PC8 10PC9,PC9 11PC10,PC10 12PC11,PC11 13PC12,PC12 14PC13,PC13 15PC14,PC14 16PC15,PC15 17PB0,PB0 18PB1,PB1 19PB2,PB2 20PB3,PB3 21PB4,PB4 22PB5,PB5 23PB6,PB6 24PB7,PB7 25PB8,PB8 26PB9,PB9 27PB10,PB10 28PB11,PB11 29PB12,PB12 30VUSB,PB13 31USB1D_N,PB14 32USB1D_P,PB15 33PA0,PA0 34PA1,PA1 35PA2,PA2 36PA3,PA3 37PA4,PA4 38PA5,PA5 39PA6,PA6 40PA7,PA7 41PA8,PA8 42PA9,PA9 43PA10,PA10 44PA11,PA11 45PA12,PA12 46PD2,PD2 47BOOT0,BOOT0 48PA15,PA15 49UART3_TX,PD8 50UART3_RX,PD9 51UART3_RTS,PD12 52UART3_CTS,PD11 53