Atmel SAM L21 Xplained Pro evaluation kit for evaluating the ATSAM21J18A microprocessor. The Atmel Studio integrated development platform supports SAM L21 Xplained Pro and explains how to integrate ATSAM21J18A into custom designs. The Xplained Pro evaluation kit includes an on-board embedded debugger. The company stated that SAM L21 Xplained Pro Kit can be programmed or debugged without external tools.