PD0, PD1, and PD2 can be in one of the active, retention, or off states. In STANDBY with all peripherals idle, the three power domains are by default automatically set in retention state, allowing a very low power consumption while retaining all the logic content. When exiting STANDBY, the domains are set back to active state. If a peripheral needs to remain active when entering STANDBY, its power domain will remain in active state. More details regarding switching of power domains are discussed in SleepWalking with Power Domain Gating. The domains are in off state when in BACKUP or OFF.