The SWCLK pin is by default assigned to the SWCLK peripheral function G to allow debugger probe detection.
A debugger probe detection (cold-plugging or hot-plugging) will automatically switch the SWDIO I/O pin to the SWDIO function, as long as the SWLCK peripheral function is selected.
Signal | Supply | I/O pin |
---|---|---|
SWCLK | VDDIO | PA30 |
SWDIO | VDDIO | PA31 |