Power control register 3
| EWUP1 | Enable Wakeup pin WKUP1 |
| EWUP2 | Enable Wakeup pin WKUP2 |
| EWUP3 | Enable Wakeup pin WKUP3 |
| EWUP4 | Enable Wakeup pin WKUP4 |
| EWUP5 | Enable WKUP5 wakeup pin |
| EWUP6 | Enable WKUP6 wakeup pin |
| RRS | SRAM retention in Standby mode |
| ENB_ULP | Ultra-low-power enable |
| APC | Apply pull-up and pull-down configuration |
| EIWUL | Enable internal wakeup line |