Using the knowledge of single chip processor and integrated circuit to control CMOS chip RTL8019AS of network card,this paper successfully realizes ETHERNET communication about three phase electromotor.

• 本文利用廉价的功能强大的MCS51单片机，应用集成电路设计以及单片机控制的各种知识，通过对网卡芯片RTL8019AS的控制，实现了三相电动机智能保护器的以太网通信。