| 1 | PE2 | I/O | Multiplexed I/O & Peripheral Pin PE2 (General) |
| 2 | PE3 | I/O | Multiplexed I/O & Peripheral Pin PE3 (General) |
| 3 | PE4 | I/O | Multiplexed I/O & Peripheral Pin PE4 (General) |
| 4 | PE5 | I/O | Multiplexed I/O & Peripheral Pin PE5 (General) |
| 5 | PE6 | I/O | Multiplexed I/O & Peripheral Pin PE6 (RTC/CLK) |
| 6 | IO3 | I/O | GPIO3 / RTC_GPIO3 / TOUCH3 / ADC1_CH2 (JTAG Source Strap) |
| 7 | PC13 | I/O | Multiplexed I/O & Peripheral Pin PC13 (RTC/CLK) |
| 8 | PC14 N- OSC32 I (1)_ | I/O | Multiplexed I/O & Peripheral Pin PC14 N- OSC32 I (1)_ (RTC/CLK) |
| 9 | PC15 U- OSC32 O T(1)_ | I/O | Multiplexed I/O & Peripheral Pin PC15 U- OSC32 O T(1)_ (RTC/CLK) |
| 10 | PF9 | I/O | Multiplexed I/O & Peripheral Pin PF9 (General) |
| 11 | PF10 | I/O | Multiplexed I/O & Peripheral Pin PF10 (General) |
| 12 | PF0 OSC IN -_ | I/O | Multiplexed I/O & Peripheral Pin PF0 OSC IN -_ (I2C, RTC/CLK) |
| 13 | PF1 - OSC_OUT | I/O | Multiplexed I/O & Peripheral Pin PF1 - OSC_OUT (I2C, RTC/CLK) |
| 14 | NRST | I | System Enable & Hardware Reset (NRST) |
| 15 | PC0 | I/O | Multiplexed I/O & Peripheral Pin PC0 (ADC, PWM) |
| 16 | PC1 | I/O | Multiplexed I/O & Peripheral Pin PC1 (ADC, PWM) |
| 17 | PC2 | I/O | Multiplexed I/O & Peripheral Pin PC2 (SPI, ADC, PWM) |
| 18 | PC3 | I/O | Multiplexed I/O & Peripheral Pin PC3 (SPI, ADC, PWM) |
| 19 | PF2 | I/O | Multiplexed I/O & Peripheral Pin PF2 (I2C) |
| 20 | VSSA/VREF - | GND | Ground Reference Pin (VSSA/VREF -) |
| 21 | VDDA | Power | Power Supply Input (VDDA — 3.3V VDD (Max 4.0V)) |
| 22 | VREF+ | I/O | Multiplexed I/O & Peripheral Pin VREF+ (DAC) |
| 23 | PA0 | I/O | Multiplexed I/O & Peripheral Pin PA0 (UART, ADC, PWM, RTC/CLK) |
| 24 | PA1 | I/O | Multiplexed I/O & Peripheral Pin PA1 (UART, SPI, ADC, RTC/CLK) |
| 25 | PA2 | I/O | Multiplexed I/O & Peripheral Pin PA2 (UART, SPI, ADC) |
| 26 | PA3 | I/O | Multiplexed I/O & Peripheral Pin PA3 (UART, SPI, ADC) |
| 27 | PF4 | I/O | Multiplexed I/O & Peripheral Pin PF4 (General) |
| 28 | VDD_2 | Power | Power Supply Input (VDD_2 — 3.3V VDD (Max 4.0V)) |
| 29 | PA4 | I/O | Multiplexed I/O & Peripheral Pin PA4 (UART, SPI, ADC) |
| 30 | PA5 | I/O | Multiplexed I/O & Peripheral Pin PA5 (SPI, ADC) |
| 31 | PA6 | I/O | Multiplexed I/O & Peripheral Pin PA6 (SPI, ADC) |
| 32 | PA7 | I/O | Multiplexed I/O & Peripheral Pin PA7 (SPI, ADC) |
| 33 | PC4 | I/O | Multiplexed I/O & Peripheral Pin PC4 (UART, ADC) |
| 34 | PC5 | I/O | Multiplexed I/O & Peripheral Pin PC5 (ADC) |
| 35 | PB0 | I/O | Multiplexed I/O & Peripheral Pin PB0 (SPI, ADC, PWM) |
| 36 | PB1 | I/O | Multiplexed I/O & Peripheral Pin PB1 (I2C, ADC) |
| 37 | PB2 | I/O | Multiplexed I/O & Peripheral Pin PB2 (I2C, ADC) |
| 38 | PE7 | I/O | Multiplexed I/O & Peripheral Pin PE7 (I2C, ADC) |
| 39 | PE8 | I/O | Multiplexed I/O & Peripheral Pin PE8 (I2C, ADC) |
| 40 | PE9 | I/O | Multiplexed I/O & Peripheral Pin PE9 (I2C, ADC) |
| 41 | PE10 | I/O | Multiplexed I/O & Peripheral Pin PE10 (I2C, ADC) |
| 42 | PE11 | I/O | Multiplexed I/O & Peripheral Pin PE11 (I2C, ADC) |
| 43 | PE12 | I/O | Multiplexed I/O & Peripheral Pin PE12 (I2C, ADC) |
| 44 | PE13 | I/O | Multiplexed I/O & Peripheral Pin PE13 (I2C, ADC) |
| 45 | PE14 | I/O | Multiplexed I/O & Peripheral Pin PE14 (I2C, ADC) |
| 46 | PE15 | I/O | Multiplexed I/O & Peripheral Pin PE15 (UART, I2C, ADC) |
| 47 | PB10 | I/O | Multiplexed I/O & Peripheral Pin PB10 (UART, SPI, I2C, ADC) |
| 48 | VREFSD - | I/O | Multiplexed I/O & Peripheral Pin VREFSD - (I2C) |
| 49 | VSSSD | GND | Exposed Thermal & Ground Pad (VSSSD) |
| 50 | VDDSD12 | Power | Power Supply Input (VDDSD12 — 3.3V VDD (Max 4.0V)) |
| 51 | VDDSD3 | Power | Power Supply Input (VDDSD3 — 3.3V VDD (Max 4.0V)) |
| 52 | VREFSD+ | I/O | Multiplexed I/O & Peripheral Pin VREFSD+ (I2C) |
| 53 | PB14 | I/O | Multiplexed I/O & Peripheral Pin PB14 (UART, SPI, I2C, ADC) |
| 54 | PB15 | I/O | Multiplexed I/O & Peripheral Pin PB15 (SPI, I2C, ADC, RTC/CLK) |
| 55 | PD8 | I/O | Multiplexed I/O & Peripheral Pin PD8 (UART, SPI, I2C, ADC) |
| 56 | PD9 | I/O | Multiplexed I/O & Peripheral Pin PD9 (UART, I2C, ADC) |
| 57 | PD10 | I/O | Multiplexed I/O & Peripheral Pin PD10 (UART, I2C, ADC) |
| 58 | PD11 | I/O | Multiplexed I/O & Peripheral Pin PD11 (UART, I2C, ADC) |
| 59 | PD12 | I/O | Multiplexed I/O & Peripheral Pin PD12 (UART, I2C, ADC) |
| 60 | PD13 | I/O | Multiplexed I/O & Peripheral Pin PD13 (I2C, ADC) |
| 61 | PD14 | I/O | Multiplexed I/O & Peripheral Pin PD14 (I2C, ADC) |
| 62 | PD15 | I/O | Multiplexed I/O & Peripheral Pin PD15 (I2C, ADC) |
| 63 | PC6 | I/O | Multiplexed I/O & Peripheral Pin PC6 (SPI, PWM) |
| 64 | PC7 | I/O | Multiplexed I/O & Peripheral Pin PC7 (SPI, PWM) |
| 65 | PC8 | I/O | Multiplexed I/O & Peripheral Pin PC8 (SPI, PWM) |
| 66 | PC9 | I/O | Multiplexed I/O & Peripheral Pin PC9 (SPI, PWM) |
| 67 | PA8 | I/O | Multiplexed I/O & Peripheral Pin PA8 (SPI, I2C, RTC/CLK) |
| 68 | PA9 | I/O | Multiplexed I/O & Peripheral Pin PA9 (SPI, I2C, PWM) |
| 69 | PA10 | I/O | Multiplexed I/O & Peripheral Pin PA10 (SPI, I2C, PWM) |
| 70 | PA11 | I/O | Multiplexed I/O & Peripheral Pin PA11 (UART, SPI, PWM) |
| 71 | PA12 | I/O | Multiplexed I/O & Peripheral Pin PA12 (USB, UART, SPI, PWM) |
| 72 | PA13 | I/O | Multiplexed I/O & Peripheral Pin PA13 (UART, SPI, SWD/JTAG) |
| 73 | PF6 | I/O | Multiplexed I/O & Peripheral Pin PF6 (UART, SPI, I2C) |
| 74 | VSS_3 | GND | Ground Reference Pin (VSS_3) |
| 75 | VDD_3 | Power | Power Supply Input (VDD_3 — 3.3V VDD (Max 4.0V)) |
| 76 | PA14 | I/O | Multiplexed I/O & Peripheral Pin PA14 (I2C) |
| 77 | PA15 | I/O | Multiplexed I/O & Peripheral Pin PA15 (SPI, I2C) |
| 78 | PC10 | I/O | Multiplexed I/O & Peripheral Pin PC10 (UART, SPI) |
| 79 | PC11 | I/O | Multiplexed I/O & Peripheral Pin PC11 (UART, SPI) |
| 80 | PC12 | I/O | Multiplexed I/O & Peripheral Pin PC12 (UART, SPI) |
| 81 | PD0 | I/O | Multiplexed I/O & Peripheral Pin PD0 (CAN) |
| 82 | PD1 | I/O | Multiplexed I/O & Peripheral Pin PD1 (CAN) |
| 83 | PD2 | I/O | Multiplexed I/O & Peripheral Pin PD2 (General) |
| 84 | PD3 | I/O | Multiplexed I/O & Peripheral Pin PD3 (UART, SPI) |
| 85 | PD4 | I/O | Multiplexed I/O & Peripheral Pin PD4 (UART, SPI) |
| 86 | PD5 | I/O | Multiplexed I/O & Peripheral Pin PD5 (UART) |
| 87 | PD6 | I/O | Multiplexed I/O & Peripheral Pin PD6 (UART, SPI) |
| 88 | PD7 | I/O | Multiplexed I/O & Peripheral Pin PD7 (UART, SPI) |
| 89 | PB3 | I/O | Multiplexed I/O & Peripheral Pin PB3 (UART, SPI, SWD/JTAG) |
| 90 | PB4 | I/O | Multiplexed I/O & Peripheral Pin PB4 (UART, SPI, PWM, SWD/JTAG) |
| 91 | PB5 | I/O | Multiplexed I/O & Peripheral Pin PB5 (SPI, I2C) |
| 92 | PB6 | I/O | Multiplexed I/O & Peripheral Pin PB6 (I2C, PWM) |
| 93 | PB7 | I/O | Multiplexed I/O & Peripheral Pin PB7 (I2C, PWM) |
| 94 | BOOT0 | I | Input-Only Pin BOOT0 (General) |
| 95 | PB8 | I/O | Multiplexed I/O & Peripheral Pin PB8 (SPI, I2C, PWM, CAN) |
| 96 | PB9 | I/O | Multiplexed I/O & Peripheral Pin PB9 (SPI, I2C, CAN) |
| 97 | PE0 | I/O | Multiplexed I/O & Peripheral Pin PE0 (UART) |
| 98 | PE1 | I/O | Multiplexed I/O & Peripheral Pin PE1 (UART) |
| 99 | VSS_1 | GND | Ground Reference Pin (VSS_1) |
| 100 | VDD_1 | Power | Power Supply Input (VDD_1 — 3.3V VDD (Max 4.0V)) |