Victor Lopez

RTC problem in TWR-MCF52259 and MQX

Discussion created by Victor Lopez on Nov 8, 2011
Latest reply on Nov 9, 2011 by Victor Lopez

As I described in subject, I found an strange issue running a simple test application with RTC and a ISR every minute. I got the example program of RTC (MQX example) and I modified to just print the time every minute using ISR of RTC. I have noted that every 24h the RTC has a deviation of about 14 seconds in relation an external control watch.


Anyone can help me? Is it normal in this RTC? So what's the solution if I want to program a clock with calendar? Must I use another external RTC?


I use MQX 3.6 with CW v7.2 for Coldfire and TWR-MCF52259.