RCC Domain 2 Kernel Clock Configuration Register
| SAI1SEL | SAI1 and DFSDM1 kernel Aclk clock source selection |
| SPI123SEL | SPI/I2S1,2 and 3 kernel clock source selection |
| SPI45SEL | SPI4 and 5 kernel clock source selection |
| SPDIFRXSEL | SPDIFRX kernel clock source selection |
| DFSDM1SEL | DFSDM1 kernel Clk clock source selection |
| FDCANSEL | FDCAN kernel clock source selection |
| SWPMISEL | SWPMI kernel clock source selection |