====== nRF52 ======

[[https://embeddedcentric.com/lesson-14-nrf5x-power-management-tutorial/|Lesson 14 – nRF5x Power Management Tutorial]]
Power modes:
  * System On (mA)
    * Subpower modes:
      * Constant latency: ''constant latency on the expense of higher current. This is done by keeping all internal voltage regulators and oscillators running.''
        * ''NRF_POWER->TASKS_CONSTLAT = 1;''
        * HF clock always ON
      * Low power (default) aka variable latency
        * lower current on the expense of latency. 
        * The internal regulators and oscillators will be switched on/off automatically by the PMU based on the peripherals/system blocks demand.
  * System Off (<1uA)