3.2 Curiosity Nano Standard Pinout
The 12 edge connections closest to the USB connector on Curiosity Nano boards have a standardized pinout. The program/debug pins have different functions depending on the target programming interface, as shown in the table and figure below.
| Debugger Signal | Target MCU | Description |
|---|---|---|
| ID | — | ID line for extensions |
| CDC TX | UART RX | USB CDC TX line |
| CDC RX | UART TX | USB CDC RX line |
| DBG0 | UPDI | Debug data line |
| DBG1 | GPIO1 |
debug GPIO1 |
| DBG2 | GPIO0 | debug GPIO0 |
| DBG3 | RESET | Reset line |
| NC | — | No connect |
| VBUS | — | VBUS voltage for external use |
| VOFF | — | Voltage Off input. Disables the target regulator and target voltage when pulled low. |
| VTG | — | Target voltage |
| GND | — | Common ground |