[u型光电传感器摘 要] 在单片机应用系统中，系统往往受到外界干扰而影响工作可靠性。“看门狗风送系统”是提高系统可靠性的非常重要的技术，因为它既可以由硬件实现，又可以由软件实现。本文主要从硬件看门狗和软件看门狗两个方面阐明其工作原理并给出应用实例。
绝缘升降平台[关键词] 单片机应用系统；硬件看门狗；软件看门狗
[Abstract] This paper introduces MCU application system can acquire noises from environment and influnce it’s reliability during the practical work, the methods to involve noises can from hardware and software 。 Watch-dog is a importent technology in system reliability，多媒体教学系统because it can be achived from not only hadware but also software.It priefly explains the watch-dog’s principle and application through hardware watch-dog and software watch-dog and gives some examples in practical application.
[Keywords] MCU application system hardware watch-dog software watch-dog透射电镜制样
1．概述
单片机应用系统是由单片机系统配以相应的软件组成的用于完成某种控制功能的系统。在实际工作中，单片机应用系统会受到外界干扰而影响其可靠性，减小干扰提高可靠性在单片机应用系统中十分重要，相应的措施有硬件措施和软件措施，因为看门狗既可以通过硬件来实现也可以通过软件来实现，所以它是解决系统抗干扰的非常重要的技术。
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