The pinout for the 6-pin PDI connector is shown in UPDI Physical Interface.
However, the JTAGICE3 has hardware, which is not able to drive the 1-wire UPDI interface on pin 3 (AVR header) without driving pin 6 (AVR header) at the same time. For this reason it is recommended to use the 10-pin mini-squid cable for UPDI.
| JTAGICE3 pin | Target pins | Mini-squid pin | Atmel STK600 UPDI pinout |
|---|---|---|---|
| Pin 1 (TCK) | 1 | ||
| Pin 2 (GND) | GND | 2 | 6 |
| Pin 3 (TDO) | UPDI_DATA | 3 | 1 |
| Pin 4 (VTG) | VTG | 4 | 2 |
| Pin 5 (TMS) | 5 | ||
| Pin 6 (nSRST) | 6 | ||
| Pin 7 (not connected) | 7 | ||
| Pin 8 (nTRST) | 8 | ||
| Pin 9 (TDI) | 9 | ||
| Pin 10 (GND) | 0 |