| Pin Number | Name | Description |
|---|---|---|
| 1 | NC | No Connect |
| 2 | UPDI | UPDI program/debug line |
| 3 | NC | No Connect |
| 4 | NC | No Connect |
| 5 | VREG | Regulated voltage or VUSB if no regulator present |
| 6 | UART RX | mEDBG UART RX line |
| 7 | UART TX | mEDBG UART TX line |
| 8 | CLK | mEDBG clock output |
| 9 | GND | Ground |
| 10 | VUSB | USB voltage |
Figure 1. Xplained Nano Standard Pinout for
UPDI