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TMS320F280049C: 看门狗使能后,主循环运行时不喂狗,测试XRSn引脚一直为高电平,不会被拉低

Part Number: TMS320F280049C


看门狗使能后,主循环运行时不喂狗,测试XRSn引脚一直为高电平,不会被拉低,请问有什么原因会造成这一现象