Fields In RTC_CALIBR (0x40002800, 0x0018)

Field	Offset	Width	STM32F0x8	STM32F103	STM32F107	STM32F217	STM32F303	STM32F3x4	STM32F469	STM32F7x9
DC	0	5	✘	✘	✘	✔	✘	✘	✔	✘
DCS	7	1	✘	✘	✘	✔	✘	✘	✔	✘