The twelve edge connections closest to the USB connector on Curiosity Nano kits 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 | ICSPTM Target | Description |
|---|---|---|
| ID | - | ID line for extensions. |
| CDC TX | UART RX | USB CDC TX line. |
| CDC RX | UART TX | USB CDC RX line. |
| DBG0 | ICSPDAT | Debug data line. |
| DBG1 | ICSPCLK | Debug clock line/DGI GPIO. |
| DBG2 | GPIO0 | DGI GPIO. |
| DBG3 | MCLR | Reset line. |
| NC | - | No connect. |
| VBUS | - | VBUS voltage for external use. |
| VOFF | - | Voltage Off input. |
| VTG | - | Target voltage. |
| GND | - | Common ground. |
Figure 1. Curiosity Nano Standard
Pinout