Datasheet

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Symbol Value Description

XOUT32

3.29pF Equivalent internal pin capacitance

42.6 Unused or Unconnected Pins

For unused pins, the default state of the pins for the will provide the lowest current leakage. There is no

need to do any configuration of the unused pins in order to lower the power consumption.

42.7 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.

Figure 42-10. SWCLK Circuit Connections

SWCLK

1kΩ

Table 42-9. SWCLK Circuit Connections

Pin Name Description Recommended Pin Connection

SWCLK Serial wire clock pin Pull-up resistor 1kΩ