Documentation for EFM32 is available via Simplicity Studio.

Start Simplicity Studio and enter the product model number to be used in the Product column (red frame in the figure below), and you will be able to obtain the following information from the blue and green frames.

• Datasheet: Datasheet. Specifications, pinout information, etc.
• Reference Manual: Reference Manual. Explanation of how to use peripherals, etc.
• Other Documents : Errata (bug information), Cortex-M guide
• Application Notes: Application notes and accompanying sample code
• Kit Documentation: Starter Kit user guide, circuit and layout information

Documentation is also available from the Silicon Labs website.
Enter the product model number and related documents will be listed.