SAM C21 Xplained Pro has a 10-pin 50-mil Cortex® Debug Connector that can be used to attach external debuggers to the ATSAMC21J18A.
| Cortex Debug Connector pin | Pin / Net | Function |
|---|---|---|
| 1 | VCC_TARGET_P3V3_P5V0 | ATSAMC21J18A voltage |
| 2 | SWDIO | SWD data signal |
| 3 | GND | Ground |
| 4 | SWCLK | SWD clock signal |
| 5 | GND | Ground |
| 6 | - | - |
| 7 | - | - |
| 8 | - | - |
| 9 | GND | Ground |
| 10 | RESETN | Target reset signal |