Labels:book | hakham | monitor | sky | stairs OCR: SECTION D CHAPTER What happens when computer executes an instruction? The term instruction cycle refers to the process n which computer executes single instruction. Some parts of ithe instruction cycle are perf rformed by the microprocessor's control unit; other parts of the cycle are performed by the ALU. The steps in this cycle are summarized in Figure -38 Fetch Interpret FIGURE 1-38 instruction instruction The instruction cycle includes four activities Increment Execute pointer to the instruction next instruction What role does the control unit play? The instructions that com- puter supposed to process for particular program are held in memory When the program begins, the memory address of the instruction placed in a par of the microprocessor control unit called an instruction pointer. ...
