clock control & status register
| LSION | Internal low-speed oscillator enable |
| LSIRDY | Internal low-speed oscillator ready |
| RMVF | Remove reset flag |
| BORRSTF | BOR reset flag |
| PADRSTF | PIN reset flag |
| PORRSTF | POR/PDR reset flag |
| SFTRSTF | Software reset flag |
| WDGRSTF | Independent watchdog reset flag |
| WWDGRSTF | Window watchdog reset flag |
| LPWRRSTF | Low-power reset flag |