单片机是智能化仪器仪表的核心，同时也往往是其功耗的主要方面。本文介绍了针对 51系列单片机应用系统降低功耗的一些设计方法，特别对 51单片机的“掉电”运行模式的应用进行了深入的分析和研究，给出了相应的硬件原理及软件流程图。 Microcontroller is the core of intelligent instrumentation, but also often the main aspects of its power consumption. This paper introduces some design methods for 51 series MCU application system to reduce power consumption, especially the application of “SCM” running mode of 51 SCM in-depth analysis and research, and gives the corresponding hardware principle and software flow Figure