1606-XLS480E---1606-XLS480E

1606-XLS480E---1606-XLS480E

问题． 什么是指令？什么是程序？简述程序在计算机中的执行过程。 
解答：指令：人为输入计算机，由计算机识别并执行一步步操作的命令的形式称为指令。 
程序：一系列指令的有序集合称为程序。 

：张亮（工程师）    专线：
24小时移动专线：         【】

程序在计算机中是按序执行的，CPU通过程序计数器PC控制程序的执行顺序，一般情况下程序是按序执行的，当执行转移、调用、返回等指令时，程序转移到相应的目的地址处执行。CPU根据程序计数器PC中的地址将欲执行指令的指令码从存储器中取出，存放在IR中，ID对IR中的指令码进行译码，定时控制逻辑在OSC配合下对ID译码后的信号进行分时，产生执行本条指令所需的全部信号，完成本条指令的执行。

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