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TIM CR2.CCDS functional?

Question asked by kelley.jeff.001 on Apr 1, 2016
Latest reply on Apr 5, 2016 by FTITI.Walid

STM32 timers CR2 contains CCDS which seems to have no effect.  Reference manuals say that it selects DMA on update rather than compare.   DIER register contains DMA enables for all compares as well as update, so described function is already covered by this other register. 

My question is:  Does timer CR2.CCDS actually do anything?  Example code that I can change it to the “wrong value” and make something fail would be nice…