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时钟来源为APBx后,除非APBx的分频系数为1,否则通用定时器的时钟频率等于APBx的2倍。即如果APB1的时钟分频系数为2,对于F1来说APB1分频后时钟频率为36MHz,那么通用定时器时钟CK_PSC的频率为36*2=72MHz,然后通过预分配器进一步分频。
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