RCC Domain 3 Kernel Clock Configuration Register
| LPUART1SEL | LPUART1 kernel clock source selection |
| I2C4SEL | I2C4 kernel clock source selection |
| LPTIM2SEL | LPTIM2 kernel clock source selection |
| LPTIM345SEL | LPTIM3,4,5 kernel clock source selection |
| ADCSEL | SAR ADC kernel clock source selection |
| SAI4ASEL | Sub-Block A of SAI4 kernel clock source selection |
| SAI4BSEL | Sub-Block B of SAI4 kernel clock source selection |
| SPI6SEL | SPI6 kernel clock source selection |