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2808系统时钟问题



系统硬件采用20M的外部晶振,当我把程序烧写进flash后带着仿真器运行时发现CPU运行的系统时钟变快了一倍,即本来配置为系统运行时钟为100MHz,但实际运行却是200MHz;当我把仿真器断掉,重新给板子上电时,系统运行时钟又恢复成100MHz,请问为什么会出现这种情况?