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一、中断系统概述277乙机设有中断系统,与不设该系统的计算机相比,使用上灵活方便,可以大大提高主机及外部设备的工作效率,同时,在扩大机器功能方面有充分的余地。所谓中断,是指计算机在执行目的程序过程中,常会发生一些急待处理的问题,如程序换道,管理外设,事故处理,入一机通讯以及实时处理等,这时,要求主机暂停执行当前程序,而转去执行一个事先编好的处理程序。处理完毕后,要么继续执行原运行程序,要么根据处理结果另行决定计算机的工作(见图1)。
First, the interrupt system overview 277 B machine with an interrupt system, compared with the computer without the system, the use of flexible and convenient, can greatly improve the efficiency of the host and external devices, at the same time, there is sufficient room to expand the function of the machine . The so-called interruption refers to the computer in the process of the implementation of the purpose, there will often be some urgent issues to be addressed, such as program lane change, management of peripherals, accident handling, into a machine communication and real-time processing, then request the host to suspend execution The current program, and go to the implementation of a pre-programmed handler. After processing, either continue to run the original run the program, or based on the processing results to decide the computer’s work (see Figure 1).