Peripherals independent clock configuration register
| USART1SEL | USART1 clock source selection |
| LPUART1SEL | LPUART1 clock source selection |
| I2C1SEL | I2C1 clock source selection |
| I2S2SEL | I2S1 clock source selection |
| LPTIM1SEL | LPTIM1 clock source selection |
| LPTIM2SEL | LPTIM2 clock source selection |
| TIM1SEL | TIM1 clock source selection |
| RNGSEL | RNG clock source selection |
| RNGDIV | Division factor of RNG clock divider |
| ADCSEL | ADCs clock source selection |