周期性中断

介绍一种基于STD5000总线的变电站微机监控与保护系统远方通信的软硬件实现方法，该系统采用串行异步通信、CDT规约，利用内部计时器的周期性中断循环发送，编程采用8086汇编语言模块化设计。

It presents a telecommunication system of microcomputer centralized protection and control system for substation , which is based on STD bus . It uses serial asynchronous communication CDT protocol , and periodic interruption to transmit information . The software is written with 8086 assembly language .

原内核中采用的是传统的周期性时钟中断服务（ISR），该时钟中断服务会周期性的检查是否有高优先级任务需要调度，这就会产生一些不必要的时钟中断ISR。

The former kernel employs traditional ways of cyclical clock interrupt service ( ISR ), which will check whether there is a cyclical high-priority task needs to be scheduled periodically . This will result in unnecessary Interruptions .