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,请各路大神指导一下,波形图蓝色的为外部晶振信号,当信号断开后,DSP发出的500kHz的晶振方波信号并没有随外部主晶振信号一同消失,而是又触发产生了一段不规则频率的波形,然后才彻底消失,这是什么原因导致的呢?