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2013網絡工程師考試試題

計算機指令一般包括操作碼和地址碼兩部分,為分析執行一條指令,其  1      

A 操作碼應存入指令寄存器(IR),地址碼應存入程序計數器(PC)   

B 操作碼應存入程序計數器(PC),地址碼應存入指令寄存器(IR)。  

C 操作碼和地址碼都應存入指令寄存器。   

D 操作碼和地址碼都應存入程序計數器

求解析。

參考答案

答案:(1)C    

試題解析:   

 指令寄存器(IR)用來保存當前正在執行的一條指令。當執行一條指令時,先把它從內存取到數據寄存器(DR)中,然后再傳送至IR。指令劃分為操作碼和地址碼字段,由二進制數字組成。為了執行任何給定的指令,必須對操作碼進行測試,以便識別所要求的操作。指令譯碼器就是做這項工作的。指令寄存器中操作碼字段的輸出就是指令譯碼器的輸入。操作碼一經譯碼后,即可向操作控制器發出具體操作的特定信號。

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