针对嵌入式系统所处的工作环境容易受到程序跑飞的干扰, 采用程序监视

技术, 提出由集成器件、分立元件和软件设计实现的三种方法, 并对此进行分析以提高系

统的可靠性和抗干扰能力。在实际设计开发测试系统中采用由分立元件组成的

g电路, 使系统的现场抗干扰能力和运行的稳定性得以大大提高-With considering unable- ending cycle in the process of practical use of embedded system, this article designs

three ways to avoid program going into unable—ending cycle by using software and hardware watchdog technology

when embedded system is disturbed.We analyses them in order to improve reliability and anti- jamming of the

system. Watchdog circuit is made up of the schism components in the SDI test system, improving the system ability

of anti- jamming and stability.