一种嵌入式系统的看门狗电路设计

The Research and Implementation of a Watchdog Circuit

根据嵌入式系统的具体应用特点,应用常规看门狗芯片设计了一种看门狗电路,在微处理器进入休眠低功耗、烧写编程、远程升级维护等模式时,看门狗功能被临时屏蔽,从而保障了这些模式的正常运行。该电路已应用在实际系统中,应用效果证明了设计的有效性。

Details of a watchdog circuit are presented.The watchdog circuit is designed based on conventional watchdog Details of a watchdog circuit are presented.The watchdog circuit is designed based on conventional watchdog IC and according to the actual circumstance.It is helpful for the application in which MCU or Embeded system usually works under serveral patterns like in sleep mode.In system programm ing,and in being remotely up-dated.The function of watchdog circuit is diabled temporarily during procedure of patterns mentioned before.Its advantages have been proved while being a part of RTU for Pharos since 2008.