User manual

...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 111
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Table 10.2. EMU Entering a Low Energy Mode
Low Energy Mode EM4CTRL EMVREG EM2BLOCK SLEEPDEEP Cortex-M3
Instruction
EM1 0 x x 0 WFI or WFE
EM2 0 0 0 1 WFI or WFE
EM4 Write sequence:
2, 3, 2, 3, 2, 3, 2,
3, 2
x x x 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. 112) . The wakeup triggers always return the EFM32 to EM0. Additionally, any reset
source will return to EM0.