51.7.1 Cortex Debug Connector (10-pin)
For debuggers and/or programmers that support the Cortex Debug Connector (10-pin) interface the signals should be connected as shown in the following figure, with details described in the following table.
| Header Signal Name | Description | 
|---|---|
| SWDCLK | Serial wire clock pin | 
| SWDIO | Serial wire bidirectional data pin | 
| RESET | Target device reset pin, active low | 
| VTref | Target voltage sense, should be connected to the device VDD | 
| GND | Ground | 
