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CLKOUT引脚输出不正确



DSP芯片为F2812,晶振频率20MHz,输入到X1;锁相环XPLLDIS上拉,PLL配置为5倍频;上电后,XCLKOUT管脚输出的波形混乱,用示波器探测,看不出频率是多少?且DSP无法工作。请问这是什么问题?