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Why TIM1_DMAR Register is always default as 1?

Question asked by li.guocheng on Apr 12, 2014
Latest reply on Apr 14, 2014 by li.guocheng
I am using STM32F103 and its Referrence Manual(RM0008) said that TIM1_DMAR's default value is 0. 
BUT when I connected the hardware and debugging with JLink, I found that TIM1_DMAR is always 1. And I never set it.
AND if I reset TIM1_DMAR to 0 at a breakpoint, then Timer1 completely stops running. What's wrong with it?