Reliance805401-1S河源
內(nèi)中斷步驟
內(nèi)中斷步驟與外中斷基本相同，每個內(nèi)中斷源有自己的中斷向量。所不同的是因為中斷源在處理機內(nèi)部，所以不必請求總線控制權，就可發(fā)送中斷向量。
(8)系統(tǒng)對同時發(fā)生的內(nèi)中斷，外中斷統(tǒng)一按如下次序服務：
①在處理“指令內(nèi)中斷”、“跟蹤內(nèi)中斷”、“堆棧溢出內(nèi)中斷”或“總線錯誤內(nèi)中斷”時又出現(xiàn)總線錯誤，處理機只能立即停機。
②在處理“指令內(nèi)中斷”、“總線錯誤內(nèi)中斷”或“跟蹤內(nèi)中斷”的過程中出現(xiàn)“堆棧溢出”，處理過程被完成。然后處理堆棧溢出。在處理堆棧溢出時，在中斷隱指令中仍有兩次壓堆棧的操作會引起堆棧進一步溢出，在處理機內(nèi)已采取措施避免因此而引起死循環(huán)。
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