16.4 Signal Description
The DSU uses the following three signals to function.
| Signal Name | Type | Description |
|---|---|---|
| RESET | Digital Input | External reset |
| SWCLK | Digital Input | SW clock |
| SWDIO | Digital I/O | SW bidirectional data pin |
Note: The SWCLK pin is by default assigned to
a SWCLK Peripheral Function from pinout multiplexing tables 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. If the SWCLK pin function is changed in the PORT, the Hot-Plugging feature
is disabled until a power-reset or an external reset is performed.