EFM32WG Datasheet, PDF (110/834 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
Table 10.2. EMU Entering a Low Energy Mode
Low Energy Mode EM4CTRL
EMVREG
EM1
EM2
EM4
0
x
0
0
Write sequence: x
2, 3, 2, 3, 2, 3, 2,
3, 2
EM2BLOCK
x
0
x
SLEEPDEEP
0
1
x
Cortex-M4
Instruction
WFI or WFE
WFI or WFE
x
(‘x’ means don’t care)
10.3.3 Leaving a Low Energy Mode
In each low energy mode a selection of peripheral units are available, and software can either enable or
disable the functionality. Enabled interrupts that can cause wakeup from a low energy mode are shown
in Table 10.3 (p. 111) . The wakeup triggers always return the EFM32 to EM0. Additionally, any reset
source will return to EM0.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
110
www.energymicro.com