Atmel Development Kit

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The Atmel® SAM R21 Xplained Pro evaluation kit is a hardware platform to evaluate the ATSAMR21G18A microcontroller. Supported by the Atmel Studio integrated development platform, the kit provides easy access to the features of the Atmel ATSAMR21G18A and explains how to integrate the device in a custom design. The Xplained Pro MCU series evaluation kits include an on-board Embedded Debugger, and no external tools are necessary to program or debug the ATSAMR21G18A. The Xplained Pro extension kits offer additional peripherals to extend the features of the board and ease the development of custom designs.

Key Features

  • ATSAMR21G18A microcontroller
  • Embedded debugger (EDBG)
  • USB interface
  • Programming and debugging on board SAM R21 through Serial Wire Debug (SWD)
  • Virtual COM-port interface to target via UART
  • Atmel Data Gateway Interface (DGI) to target via SPI and TWI
  • Four GPIOs connected to target for code instrumentation
  • Digital I/O
  • Two mechanical buttons (user and reset button)
  • One user LED
  • Two extension headers
  • Three possible power sources
  • External power
  • Embedded debugger USB
  • Target USB
  • 32KHz crystal
  • 16MHz crystal
  • Supported with application examples in Atmel Software Framework

Available board extensions:

  • ATIO1-XPRO: The I/O1 Xplained Pro provides a light sensor, temperature sensor, and microSD card (see details at
  • ATOLED1-XPRO: The OLED1 Xplained Pro provides a 128×32 OLED display, 3 LEDs and 3 push buttons (see details).
  • ATPROTO1-XPRO: The PROTO1 Xplained Pro provides easy prototyping on the Xplained Pro Platform. It connects to the extension headers of any Xplained Pro board and can be used as a gateway to other Xplained Pro extension boards with its own Xplained Pro extension header (see details at
  • ATETHERNET-XPRO: TheEthernet1 Xplained Pro is an extension board to the Atmel Xplained Pro evaluation platform. The board enables the user to experiment with Ethernet network connectivity applications (see more at

What’s included:

    • Each with an antenna and USB cable
  • 1 ATIO1-XPRO