45.7 Programming and Debug Ports

For programming and/or debugging the SAM D21 the device should be connected using the Serial Wire Debug, SWD, interface. Currently the SWD interface is supported by several Microchip and third party programmers and debuggers, like the JTAGICE3, SAM-ICE, ATMEL_ICE or SAM D21 Xplained Pro ( SAM D21 evaluation kit) Embedded Debugger.

Refer to the JTAGICE3, SAM-ICE, ATMEL_ICE or SAM D21 Xplained Pro user guides for details on debugging and programming connections and options. For connecting to any other programming or debugging tool, refer to that specific programmer or debugger’s user guide.

The SAM D21 Xplained Pro evaluation board for the SAM D21 supports programming and debugging through the onboard embedded debugger so no external programmer or debugger is needed.

Note that a pull-up resistor on the SWCLK pin is critical for reliable operations. Refer to related link for more information.