说明：  上以A R M 芯片为例,详细分析了在发生中断时如何实现中断现场的保护以及一 般嵌入式操作系统的多任务切换过程
(To the ARM chip as an example, a detailed analysis of disruption in the event of interruption of how to achieve the protection of the scene as well as the general multi-tasking embedded operating system switch process)