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K21: RTC code crashes later rev silicon

Question asked by Rhys Drummond on Aug 23, 2018
Latest reply on Sep 4, 2018 by Mark Butcher

I have some Processor Expert code that uses the RTC on an MK21FX512VMC12.  On one of our systems (chip rev ID = 1) this works with no problems. On a newer system (chip rev ID = 9) the code hits an exception:


PE_ISR(Cpu_Interrupt) { PE_DEBUGHALT(); }


When we disable the RTC and comment out the referencing code it works fine.


Apparently there is some significant silicon difference that breaks this.  Any ideas?  I plan to query the PE guys as well regarding this, as if there was a fix, the PE components should know about it and work around it accordingly, perhaps.