====== RTC Real-time Clock and Calendar ======

Time-of-day clock/calendar with subseconds, seconds, minutes, hours (12h/24h format), day (day of week), date (day of month), month, and year.

\\ {{rtc_calendar_registers.svg?400em}} \\ \\

==== RTC_DR - RTC Date Register ====

\\ {{rtc_reg_dr.svg}} \\ \\

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|DU[3:0]|Date units in BCD format|||
|DT[1:0]|Date tens in BCD format|||
|MU[3:0]|Month units in BCD format|||
|MT|Month tens in BCD format|||
|WDU[2:0]|Week day units|000|Forbidden|
|:::|:::|001|Monday|
|:::|:::|...|...|
|:::|:::|111|Sunday|
|YU[3:0]|Year units in BCD format|||
|YT[3:0]|Year tens in BCD format||


==== RTC_TR - RTC Time Register====

\\ {{rtc_reg_tr.svg}} \\ \\

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|SU[3:0]|Second units in BCD format|||
|ST[2:0]|Second tens in BCD format|||
|MNU[3:0]|Minute units in BCD format|||
|MNT[2:0]|Minute tens in BCD format|||
|HU[3:0]|Hour units in BCD format|||
|HT[1:0]|Hour tens in BCD format|||
|PM|AM/PM notation|0|AM or 24-hour format|
|:::|:::|1|PM|

==== RTC_SSR - RTC Sub Second Register ====

\\ {{rtc_reg_ssr.svg}} \\ \\

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|SS[15:0]|Sub second value|Second fraction = (PREDIV_S - SS)/(PREDIV_S + 1)||