For debuggers and/or programmers that support the 20-pin IDC JTAG Connector, e.g., the SAM-ICE, 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 |
VCC | Target voltage sense, should be connected to the device VDD |
GND | Ground |
GND* | These pins are reserved for firmware extension purposes. They can be left unconnected or connected to GND in normal debug environment. They are not essential for SWD in general. |