You solved your problem with RTC which generates at least 120x more interrupts as compared with what is possible with a regular 16-bit Timer? Sorry to say this, I think you have more fundamental problems. I think you will have a very difficult time ahead of you. You start with a problem that need to detect power failure. You could not find a way to do that and you end up wanting to reset the system every hour-and-half. I cannot believe that is a correct path.
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