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  |