Power control register 1
| LPMS | Low-power mode selection for CPU1 |
| SUBGHZSPINSSSEL | sub-GHz SPI NSS source select |
| FPDR | Flash memory power down mode during LPRun for CPU1 |
| FPDS | Flash memory power down mode during LPSleep for CPU1 |
| DBP | Disable backup domain write protection |
| VOS | Voltage scaling range selection |
| LPR | Low-power run |