Resolved! STM32H745: DS and RM disagree, which to believe?
STM32H745 datasheet says:RTC_OUT can come out PB2 port. No other port is listed in the DS for RTC_OUT. See table 8, page 62. RTC_OUT also listed in table 10, page 90, and note for PC13, page 92.STM32H745 reference manual says:RTC_OUT can be direc...