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这里,“可屏蔽”是指“被禁止”。
当发生中断请求信号时,如果CPU设置为启用中断,就可以执行中断处理。
如果中断设置为禁用,则将忽略中断请求信号,不执行中断处理。
忽略的中断请求信号会被保留,直到中断请求变为启用或者命令被程序取消。
这样,可屏蔽中断可以自由地启用或者禁用中断处理。
它通常由程序设置。
当CPU收到中断请求信号之后,中断控制电路将转入中断处理操作。