EFM32WG Datasheet, PDF (747/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

...the world's most energy friendly microcontrollers
31.5.17 AES_KEYHD - KEY High Register
Offset
0x04C
Bit Position
Reset
Access
Name
Bit
Name
Reset
Access Description
31:0
KEYHD
0x00000000
RW
Key High Access D
Access the high key words through this register.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
747
www.energymicro.com