System Control Register
| SLEEPONEXIT | When set to 1, the core can enter a sleep state on an exception return to Thread mode. This is the mode and exception level entered at reset, the base level of execution. |
| SLEEPDEEP | A qualifying hint that indicates waking from sleep might take longer. |
| SEVONPEND | When enabled, interrupt transitions from Inactive to Pending are included in the list of wakeup events for the WFE instruction. |