RCC Clock Configuration Register
| SW | System clock switch |
| SWS | System clock switch status |
| STOPWUCK | System clock selection after a wake up from system Stop |
| STOPKERWUCK | Kernel clock selection after a wake up from system Stop |
| RTCPRE | HSE division factor for RTC clock |
| TIMPRE | Timers clocks prescaler selection |
| MCO1PRE | MCO1 prescaler |
| MCO1 | Micro-controller clock output 1 |
| MCO2PRE | MCO2 prescaler |
| MCO2 | Micro-controller clock output 2 |