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请问tm4c 1233 mcu其上电默认是否为外部晶振提供工作震荡?

给mcu 供上3.3v 电源并接上晶振和电容,上电后用示波器标笔测量晶振两端是否就会出现震荡的正弦波? 还是说需要软件程序把mcu 的外部晶振打开才能测量到正弦波?