Power control register 1
| LPMS | Low-power mode selection |
| FPD_STOP | Flash memory powered down during Stop mode |
| FPD_LPRUN | Flash memory powered down during Low-power run mode |
| FPD_LPSLP | Flash memory powered down during Low-power sleep mode |
| DBP | Disable backup domain write protection |
| VOS | Voltage scaling range selection |
| LPR | Low-power run |