### Low Power Entry Sequence

Source: https://github.com/stmicroelectronics/stm32f4xx-hal-driver/blob/master/Release_Notes.html

Recommended sequence for entering sleep mode to ensure pending events are cleared before entering the low power state.

```C
__SEV()
__WFE()
__WFE()
```

--------------------------------

### Enter Low Power Sleep Mode

Source: https://github.com/stmicroelectronics/stm32f4xx-hal-driver/blob/master/Release_Notes.html

Use this sequence to ensure the Cortex-M4 core enters sleep mode correctly by clearing any pending events before the final wait instruction.

```c
__SEV();
__WFE();
__WFE();
```

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