Computer Structure: Fetch, Decode, Execute 

What is program counter :

          a register in the control unit of the CPU that is used to keep track of the address of the current or next instruction. Typically, the program counter is advanced to the next instruction, and then the current instruction is executed. Also known as a "sequence control register".

Steps:

1.    Fetch—Microprocessor gets a software instruction from memory telling it what to do with the data.

 

2.    Decode—Microprocessor determines what the instruction means.

 

3.    Execute—Microprocessor performs the instruction.