3.3.4.2.2 SAM SWD Pinout

For the 10-pin JTAG connector:
Figure 3-11. SAM SWD Header Pinout
Table 3-6. SAM SWD Pin Description
Name SAM Port PinDescription
SWDCLK4Serial Wire Debug Clock
SWDIO2Serial Wire Debug Data Input/Output
SWO6Serial Wire Output (optional- not implemented on all devices)
nSRST10Reset
VTG1Target voltage reference - not used by MPLAB ICD 5
GND3, 5, 9Ground