CM4 status
| SLEEPING | Specifies if the CPU is in Active, Sleep or DeepSleep power mode:
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| SLEEPDEEP | Specifies if the CPU is in Sleep or DeepSleep power mode. See SLEEPING field. |
| PWR_DONE | After a PWR_MODE change this flag indicates if the new power mode has taken effect or not. Note: this flag can also change as a result of a change in debug power up req |