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F28335内核电压的问题



现在使用F28335芯片,看技术文档上说是内核电压1.9v/1.8V。这个意思是工作在100mhz时使用1.8v,工作在150mhz时使用1.9v,还是最大频率100mhz的器件(F28332)内核电压为1.8v,而最大频率150mhz的器件(F28335/F28334)的内核电压用1.9v。文档上说的含义不是很清楚,希望能够得到解答,谢谢各位啦