Power control register 3
| EWUP1 | Enable Wakeup pin WKUP1 |
| EWUP4 | Enable Wakeup pin WKUP4 |
| EBORHSDFB | Enable BORH and Step Down counverter forced in Bypass interrups for CPU1 |
| RRS | SRAM2a retention in Standby mode |
| APC | Apply pull-up and pull-down configuration |
| ECRPE | Enable critical radio phase end of activity interrupt for CPU1 |
| EBLEA | Enable BLE end of activity interrupt for CPU1 |
| EC2H | Enable CPU2 Hold interrupt for CPU1 |
| EIWUL | Enable internal wakeup line for CPU1 |