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你好：我想控制tps3813的看门狗的超时时间，所以把WDT引脚接到了ARM上。上电后第一时间输出低电平并进行喂狗，但是ARM还是反复复位 ;如果将WDT引脚接到VCC或者GND上时，一切正常; 请问这是怎么回事？
