| Field | Offset | Width | STM32L0x3 | STM32L162 | STM32L4x6 |
|---|---|---|---|---|---|
| USART1SEL | 0 | 2 | ✘ | ✘ | ✔ |
| USART2SEL | 2 | 2 | ✘ | ✘ | ✔ |
| USART3SEL | 4 | 2 | ✘ | ✘ | ✔ |
| UART4SEL | 6 | 2 | ✘ | ✘ | ✔ |
| UART5SEL | 8 | 2 | ✘ | ✘ | ✔ |
| LPUART1SEL | 10 | 2 | ✘ | ✘ | ✔ |
| I2C1SEL | 12 | 2 | ✘ | ✘ | ✔ |
| I2C2SEL | 14 | 2 | ✘ | ✘ | ✔ |
| I2C3SEL | 16 | 2 | ✘ | ✘ | ✔ |
| LPTIM1SEL | 18 | 2 | ✘ | ✘ | ✔ |
| LPTIM2SEL | 20 | 2 | ✘ | ✘ | ✔ |
| SAI1SEL | 22 | 2 | ✘ | ✘ | ✔ |
| SAI2SEL | 24 | 2 | ✘ | ✘ | ✔ |
| CLK48SEL | 26 | 2 | ✘ | ✘ | ✔ |
| ADCSEL | 28 | 2 | ✘ | ✘ | ✔ |
| SWPMI1SEL | 30 | 1 | ✘ | ✘ | ✔ |
| DFSDMSEL | 31 | 1 | ✘ | ✘ | ✔ |