RTC Calibration Woes!
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2018-02-15 11:04 AM
Posted on February 15, 2018 at 20:04
Hi! Working with the STM32F746ZG RTC. Clock, Calendar, and wakeup interrupt working fine. Have Battery Backup for RTC. I'm trying to perform a Smooth Calibration which does work but I find that not all of the CALM[0:8] bits in RTC_CALR seem to work. I did some experiments and found that CALM[0:4] bits don't affect the calibration, CALM[5:8] bits do. The finest step change seems to be approx. 31 micro Hz.
Another thought, does the calibration get lost upon losing battery power?
Great Processor but what a learning curve!
#stm32f746zg-rtc-smooth-calibration
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STM32F7 Series
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