clock control register
| HSION | Internal high-speed clock enable |
| HSIKERON | High Speed Internal clock enable in Stop mode |
| HSIRDY | HSI clock ready flag |
| HSIDIV | HSI clock divider |
| HSIDIVF | HSI divider flag |
| CSION | CSI clock enable |
| CSIRDY | CSI clock ready flag |
| CSIKERON | CSI clock enable in Stop mode |
| RC48ON | RC48 clock enable |
| RC48RDY | RC48 clock ready flag |
| D1CKRDY | D1 domain clocks ready flag |
| D2CKRDY | D2 domain clocks ready flag |
| HSEON | HSE clock enable |
| HSERDY | HSE clock ready flag |
| HSEBYP | HSE clock bypass |
| HSECSSON | HSE Clock Security System enable |
| PLL1ON | PLL1 enable |
| PLL1RDY | PLL1 clock ready flag |
| PLL2ON | PLL2 enable |
| PLL2RDY | PLL2 clock ready flag |
| PLL3ON | PLL3 enable |
| PLL3RDY | PLL3 clock ready flag |