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F28M35输出时钟为10MHz,请问是什么原因



F28M35的开发板,在用仿真器仿真情况下,EPI配置为GPMODE,时钟输出管脚为37.5MHz,GPIO34配置为C28的XCLK_OUT,管脚输出为37.5MHz。脱离仿真器,让工程从Flash启动,EPI时钟输出和GPIO34输出的时钟均为10MHz。请问出现这种情况可能是哪的问题?