运用外部时钟,XT2,频率是4MHz。让单片机运行最快的速度是多少,当达到极限的频率时,对单片机运行pwm是不是还准确
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运用外部时钟,XT2,频率是4MHz。让单片机运行最快的速度是多少,当达到极限的频率时,对单片机运行pwm是不是还准确