The text provides a practical electric circuit, it can realize switch between ISP state and normal operation state for P89C51RD2.
本文提供一种实用电路，使得8位单片机P89C51RD2方便地实现ISP状态与正常运行状态的切换。
The new practical design method and design circuit for multi-state control of multi electric machinery are provided in this paper by using the method of logical function.
通过运用逻辑函数的方法，对多台电机多种状态控制线路提出了新型实用的设计方法及设计电路。
On the base of practical transformer substation main connection, electric components and system circuit model are first formed in the paper;
本文针对中低压变电站的实际主接线建立各电气元件及系统的电路模型；
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