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28377s的时钟输入问题

Other Parts Discussed in Thread: TMS320F28377S, CONTROLSUITE

TMS320F28377s,输入时钟频率表(表5-7)里,f(x1)的两栏,“PLL enabled” 时的输入时钟频率为2-25MHz, “PLL disabled” 时的输入时钟频率为2-100MHz,这是什么意思呀?如果我选用的外部有源晶振是30MHz的,是不是就不能使用PLL来倍频和分频了?