Control/status register
| LSION | LSI oscillator enable |
| LSIRDY | LSI oscillator ready |
| LSIPRE | LSI frequency prescaler |
| MSISRANGE | MSI clock ranges |
| RFRSTF | Radio in reset status flag |
| RFRST | Radio reset |
| RMVF | Remove reset flag |
| RFILARSTF | Radio illegal access 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 |