CSR
| LSI1ON | LSI1 oscillator enabled |
| LSI1RDY | LSI1 oscillator ready |
| LSI2ON | LSI2 oscillator enabled |
| LSI2RDY | LSI2 oscillator ready |
| LSI2TRIMEN | LSI2 oscillator trimming enable |
| LSI2TRIMOK | LSI2 oscillator trim OK |
| LSI2BW | LSI2 oscillator bias configuration |
| RFWKPSEL | RF system wakeup clock source selection |
| RFRSTS | Radio system BLE and 802.15.4 reset status |
| RMVF | Remove reset flag |
| OBLRSTF | Option byte loader reset flag |
| PINRSTF | Pin reset flag |
| BORRSTF | BOR flag |
| SFTRSTF | Software reset flag |
| IWDGRSTF | Independent window watchdog reset flag |
| WWDGRSTF | Window watchdog reset flag |
| LPWRRSTF | Low-power reset flag |