The JTAGICE3 debugger and programmer does not support the Cortex Debug Connector (10-pin) directly, hence a special pinout is needed to directly connect the SAM L21 to the JTAGICE3, alternatively one can use the JTAGICE3 squid cable and manually match the signals between the JTAGICE3 and SAM L21. Figure 1 describes how to connect a 10-pin header that support connecting the JTAGICE3 directly to the SAM L21 without the need for a squid cable. This can also be used for the Atmel-ICE AVR connector port.
The JTAGICE3 squid cable or the JTACICE3 50mil cable can be used to connect the JTAGICE3 programmer and debugger to the SAM L21. 10-pin JTAGICE3 Compatible Serial Wire Debug Interface illustrates the correct pinout for the JTAGICE3 50 mil, and details are given in Table 1.
| Header Signal Name | Description |
|---|---|
| SWDCLK | Serial wire clock pin |
| SWDIO | Serial wire bidirectional data pin |
| RESET | Target device reset pin, active low |
| VTG | Target voltage sense, should be connected to the device VDD |
| GND | Ground |