Power control register 3
| EWUP1 | Enable Wakeup pin WKUP1 for CPU1 |
| EWUP2 | Enable Wakeup pin WKUP2 for CPU1 |
| EWUP3 | Enable Wakeup pin WKUP3 for CPU1 |
| EULPEN | Ultra-low-power enable |
| EWPVD | Enable wakeup PVD for CPU1 |
| RRS | SRAM2 retention in Standby mode |
| APC | Apply pull-up and pull-down configuration from CPU1 |
| EWRFBUSY | Enable Radio BUSY Wakeup from Standby for CPU1 |
| EWRFIRQ | akeup for CPU1 |
| EC2H | nable CPU2 Hold interrupt for CPU1 |
| EIWUL | Enable internal wakeup line for CPU1 |