A safeguard system of smart home based on embedded Ethernet is introduced in this paper. The principle of data transmission of the Ethernet chip RTL8019AS is introduced.

• 文章介绍了一种基于单片机和嵌入式以太网的智能小区安防系统,给出了该系统的硬件接口图和软件流程图,说明了以太网传输芯片RTL8019AS的数据收发原理,采用C51语言实现了ARP协议、ICMP协议和UDP协议。