RE: Handling RTC overflow

Steve H — Thu, 27 Apr 2017 11:58:09 GMT

Great, thanks butch. I'll just ensure that the 32-bit target counter value is modulo 24-bit before I set it.

RE: Handling RTC overflow

butch — Thu, 27 Apr 2017 11:51:17 GMT

I think you do not need to "handle it" if your other math for setting the compare registers is proper modulo (clock) arithmetic. When the counter overflows, it goes back to zero and keeps counting. You can configure an event for overflow, but I don't think you need to (unless you need to count the overflows, for example to keep a long clock.) The tricky part is setting the compare register: when the counter is near overflow it is a large number, when you calculate the compare value modulo the size of the counter it yields a small number, but thats what it should be. All unsigned arithmetic.