Clock configuration register
| SW | System clock switch |
| SWS | System clock switch status |
| HPRE | HCLK1 prescaler (CPU1, AHB1, AHB2, and SRAM1.) |
| PPRE1 | PCLK1 low-speed prescaler (APB1) |
| PPRE2 | PCLK2 high-speed prescaler (APB2) |
| STOPWUCK | Wakeup from Stop and CSS backup clock selection |
| HPREF | HCLK1 prescaler flag (CPU1, AHB1, AHB2, and SRAM1) |
| PPRE1F | PCLK1 prescaler flag (APB1) |
| PPRE2F | PCLK2 prescaler flag (APB2) |
| MCOSEL | Microcontroller clock output |
| MCOPRE | Microcontroller clock output prescaler |