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The sequence of operations that the cpu has to carry out while execution is called instruction cycle.

1:- Read an Instruction

2:- Decode the instruction

3:- Find the address of operand

4:- retrieve an operand

5:- perform desired operation

6:- find the address of destination

7:- store the result into the destination

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13y ago

In a computer, the cycle of execution of an instruction begins in the central processing unit (CPU) with following processes happening step by step:

  • fetching of instruction: Instructions are stored in various address in memory (RAM). The program counter (PC) holds the memory address of the next instruction, which is passed to a memory controller and the content is fetched.
  • decoding of instruction: the instruction is decoded in computer understandable form. (The PC is either incremented to address of next instruction, or loaded with a new address.)
  • execution cycle: the instruction decoder activates various parts in the execution unit necessary for execution of this instruction. This may be done in stages using clock signals.
  • storage: the result is stored, and the cycle begins again.

These various stages often overlap in time, so each part of the computer is kept busy.

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Q: What is execute cycle in microprocessor?
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