P0901QZ控制器选亿佳
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,在处理机内已采取措施避免因此而引起死循环。
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