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TMS320F2812时钟输出不正常

Other Parts Discussed in Thread: TMS320F2812

TI的技术支持:

你好!我的电路板使用TMS320F2812为主控芯片,外部正确配置电源、复位和时钟,时钟输入采用外部20MHZ无源晶振。总共有70块电路板,在系统上电后,其中65块的CLKOUT输出为80M,相当于4倍倍频,有5块的CLKOUT输出为20M。这70块电路的主控均未加载任何程序,为什么会出现这种情况,有的倍频4倍,有的未倍频?PLL使能引脚均使能。是出厂设置的原因吗?