问题 单项选择题

为了控制用户程序不能执行特权指令是通过设置PSW中的一个状态位来标志,这一位是 ______。

A.保护位

B.CPU状态位

C.屏蔽位

D.条件位

答案

参考答案:B

解析:[评析] 程序状态字PSW由条件码标志和控制标志构成,其中控制信息是由系统程序和用户程序根据需要用指令来设置的,而状态信息是由中央处理器根据计算的结果自动设置的。

单项选择题
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