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堅士人
心動(dòng)就要行動(dòng)
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樓主  發(fā)表于: 2011-01-19 11:32
不斷反復運行程序.稱(chēng)為掃描運行方式.那么中斷呢...........
pretco123
不為失敗找理由，只為成功找方法
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1樓  發(fā)表于: 2011-01-20 09:17
掃描就是從程序開(kāi)關(guān)掃描到END結束再返回,刷新I/O狀態(tài)就是在不同時(shí)刻掃描I/O的實(shí)時(shí)狀態(tài)!中斷就是停下來(lái)做其他事情,做完了再回來(lái)的意思.

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