（3）看门狗电路 看门狗电路（Watch Dog Timer，WDT）用于监测单片机的程序运行。为防止在工作过程中单片机内部程序运行发生错误，出现死机现象，加入了WDT。
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In this design, the band gap, voltage difference, oscillator and watch dog timer modules were integrated and many functions including power-on reset, watch dog timing, manual-reset and power-down protection were realized.
它集成了基准带隙电压源、电压比较器、时基振荡、看门狗等模块,整合了掉电保护、上电复位、看门狗定时、手动复位等多个功能,能够监控电源电压、电池故障和微处理器或微控制器的工作状态。
参考来源 - CMOS电源监控芯片的设计·2,447,543篇论文数据，部分数据来源于NoteExpress
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