Pawel Opalinski

MCF52236 and PLL

Discussion created by Pawel Opalinski on Nov 30, 2011
Latest reply on Dec 2, 2011 by Pawel Opalinski



I have a problem with PLL:


uC works with Crystal 25MHz and PLL multiply by two (devide 8 [predivider] and then multiply by 16[MRD]) , so should be 50MHz.


Sometimes The uC wakes up in correct  frequency(50MHz) but sometimes runs faster...


Does anybody have that problem with this uC?

The same program on MCF52234 works perfect - always wakes up with 50MHz


Crystal works properly - 25MHz on EXTAL, PCB is correct, all peripheral capacitors are correct...

I think it must be problem of uC...


Best Regards