用来指出下一条待执行指令地址寄存器是______。
- A.程序计数器
- B.通用寄存器
- C.指令寄存器
- D.状态寄存器
正确答案及解析
正确答案
解析
程序计数器(Program Counter，PC)也称为指令计数器，用于存放下一条指令所在单元地址。CPU使用PC以确定下一条指令地址，从而保证操作系统中程序(或进程)能够连续地执行下去。通用寄存器可用于传送和暂存数据，也可参与算术逻辑运算，并保存运算结果。除此之外，它们还各自具有一些特殊功能(例如，AX为累加器，CX为计数器，BX、BP为基址寄存器，SI、DI为变址寄存器，BP还可以是基指针，SP为堆栈指针。)。指令寄存器(IR)用来保存当前正在执行一条指令。状态寄存器(也称为条件码寄存器)用于存放两类信息：①是体现当前指令执行结果各种状态信息(条件码)，例如有无进位(CF位)、有无溢出(OV位)、结果正负(SF位)、结果是否为零(ZF位)、奇偶标志位(P位)等；②是存放控制信息(PSW：程序状态字寄存器)，例如允许中断(IF位)、跟踪标志(TF位)等。
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