13.4 Signal Description
The DSU uses the following three signals to function.
| Signal Name | Type | Description |
|---|---|---|
| RESET | Digital Input | External reset pin |
| SWCLK | Digital Input | SW clock pin |
| SWDIO | Digital I/O | SW bidirectional data pin |
Note: The SWCLK pin is by default assigned to
the DSU module to allow debugger probe detection and to stretch the CPU reset phase. For
more information, refer to 20.6.3 Debugger Probe Detection. The Hot-Plugging feature
depends on the PORT configuration. 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.