SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
A power domain can be only in one of the two states (ON or OFF), defined as follows:
The AlwaysOn power domain in WKUP domain is always in the ON state when the device is powered on. The AlwaysOn power domain in MAIN domain is software controlled and is in OFF state in MCU-ONLY and DeepSleep modes. The other power domains can be in either the ON or OFF state; that is, the logic/memory for a specific module can remain powered down if it is not used.