RCC Domain 2 Kernel Clock Configuration Register
| SAI1SRC | SAI1 and DFSDM1 kernel Aclk clock source selection |
| SAI23SRC | SAI2 and SAI3 kernel clock source selection |
| SPI123SRC | SPI/I2S1,2 and 3 kernel clock source selection |
| SPI45SRC | SPI4 and 5 kernel clock source selection |
| SPDIFSRC | SPDIFRX kernel clock source selection |
| DFSDM1SRC | DFSDM1 kernel Clk clock source selection |
| FDCANSRC | FDCAN kernel clock source selection |
| SWPSRC | SWPMI kernel clock source selection |