SAM L21

7.2.2 Serial Wire Debug Interface Pinout

Only the SWCLK pin is mapped to the normal PORT functions. A debugger cold-plugging or hot-plugging detection will automatically switch the SWDIO port to the SWDIO function.

Table 7-4. Serial Wire Debug Interface Pinout
Signal	Supply	I/O pin
SWCLK	VDDIN	PA30
SWDIO	VDDIN	PA31

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