CCIPR
| USART1SEL | USART1 clock source selection |
| LPUART1SEL | LPUART1 clock source selection |
| I2C1SEL | I2C1 clock source selection |
| I2C3SEL | I2C3 clock source selection |
| LPTIM1SEL | Low power timer 1 clock source selection |
| LPTIM2SEL | Low power timer 2 clock source selection |
| SAI1SEL | SAI1 clock source selection |
| CLK48SEL | 48 MHz clock source selection |
| ADCSEL | ADCs clock source selection |
| RNGSEL | RNG clock source selection |