AT89C2051 is a powerful programmed microchip, the hardware principle and software realization of guard against theft and alarm system based on AT89c2051 are introduced.

• AT89C2051单片机是功能强大的可编程微控器,文中提出了以AT89C2051设计的住宅小区防盗报警系统的硬件原理和软件实现。