Fields In USART3_BRR (0x40004800, 0x0008)

Field	Offset	Width	STM32F0x8	STM32F103	STM32F107	STM32F217	STM32F303	STM32F3x4	STM32F469	STM32F7x9
DIV_Fraction	0	4	✘	✔	✔	✔	✘	✘	✔	✘
DIV_Mantissa	4	12	✘	✔	✔	✔	✘	✘	✔	✘