The following sections describes the implementation of the relevant connectors and headers on SAM L21 Xplained Pro and their connection to the ATSAML21J18B. The tables of connections in the sections also describes which signals are shared between the headers and on-board functionality. Figure 1 shows all available connectors and jumpers on SAM L21 Xplained Pro.

Figure 1. SAM L21 Xplained Pro Connector Overview