The SAM L21 Xplained Pro evaluation kit is ideal for evaluating and prototyping with the ultra low power SAM L21 ARM Cortex-M0+ based microcontrollers. Xplained Pro extension kits that are compatible with SAM L21 Xplained Pro can be purchased individually Key Features 32.768kHz crystal USB interface, device and host mode Three Xplained Pro extension headers One QTouch button Embedded Debugger - Auto-ID for board identification in Atmel Studio - One yellow status LED - One green board power LED - Symbolic debug of complex data types including scope information - Programming and debugging including power measurement - Data Gateway Interface: SPI, I2C, 4 GPIOs o Virtual COM port (CDC). USB powered Supported with application examples in Atmel Software Framework