Explain the workingmechanism and process of its key parts such as single chip, programmable interval timer, VMOS andcoding switch.Provide the main controlling program diagrams at assembly language.

• 说明了主要部件单片机、定时/计数器、VMOS管、拨码开关的工作原理及过程,给出了汇编语言的主要程序流程图。