A5E00016915 稳定器

A5E00016915 稳定器

内中断步骤

内中断步骤与外中断基本相同，每个内中断源有自己的中断向量。所不同的是因为中断源在处理机内部，所以不必请求总线控制权，就可发送中断向量。

(8)系统对同时发生的内中断，外中断统一按如下优先次序服务：

①在处理“指令内中断”、“跟踪内中断”、“堆栈溢出内中断”或“总线错误内中断”时又出现总线错误，处理机只能立即停机。

②在处理“指令内中断”、“总线错误内中断”或“跟踪内中断”的过程中出现“堆栈溢出”，处理过程被完成。然后处理堆栈溢出。在处理堆栈溢出时，在中断隐指令中仍有两次压堆栈的操作会引起堆栈进一步溢出，在中央处理机内已采取措施避免因此而引起死循环。

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