| 1 | P0.08 | I/O | General-purpose I/O |
| 2 | P0.09 | I/O | General-purpose I/O |
| 3 | P0.10 | I/O | General-purpose I/O |
| 4 | P0.11 | I/O | General-purpose I/O |
| 5 | RESET | Input | System reset |
| 6 | GND | — | Ground |
| 7 | 3.6V(OUT) | Output | 3.6V regulated output |
| 8 | 3.3V(OUT) | Output | 3.3V regulated output |
| 9 | VSYS(IN) | Input | System supply input (3.0-5.5V) |
| 10 | VBUS(IN) | Input | USB 5V power input |
| 11 | VEXT(IN) | Input | External regulated power input |
| 12 | GND | — | Ground |
| 13 | LED0/P0.23 | Output | General-purpose LED (active low, red) |
| 14 | LED1/P0.24 | Output | General-purpose LED (active low, yellow) |
| 15 | LED2/P0.25 | Output | General-purpose LED (active low, green) |
| 16 | BTN0/P0.18 | Input | General-purpose Button (internal pull-up) |
| 17 | BTN1/P0.19 | Input | General-purpose Button (internal pull-up) |
| 18 | GND | — | Ground |
| 19 | VGPIO(IN) | Input | I/O reference voltage input
(Can be connected with 3.3V) |
| 20 | P0.17/AIN4 | I/O | General-purpose I/O / Analog Input Channel 4 |
| 21 | P0.16/AIN3 | I/O | General-purpose I/O / Analog Input Channel 3 |
| 22 | P0.14/AIN1 | I/O | General-purpose I/O / Analog Input Channel 1 |
| 23 | P0.12 | I/O | General-purpose I/O |
| 24 | P0.15/AIN2 | I/O | General-purpose I/O / Analog Input Channel 2 |
| 25 | P0.13/AIN0 | I/O | General-purpose I/O / Analog Input Channel 0 |
| 26 | P0.31 | I/O | General-purpose I/O |
| 27 | P0.29 | I/O | General-purpose I/O |
| 28 | P0.30 | I/O | General-purpose I/O |
| 29 | P0.28 | I/O | General-purpose I/O |
