Fractional Divider Register. Generates a clock input for the baud rate divider.
| DIVADDVAL | Baud rate generation pre-scaler divisor value. If this field is 0, fractional baud rate generator will not impact the USART baud rate. |
| MULVAL | Baud rate pre-scaler multiplier value. This field must be greater or equal 1 for USART to operate properly, regardless of whether the fractional baud rate generator is used or not. |
| RESERVED | Reserved, user software should not write ones to reserved bits. The value read from a reserved bit is not defined. |