Instruction Execution in a Computer System

How does instruction execute in a Computer System?

              To execute instruction the Computer performs the following tasks-

• The control unit reads/fetches an instruction from Memory and Decodes/Translates it.
• For Automatic or Logical type of instruction, Control unit generates enable signals for the ALU(Arithmatic and Logical Unit) to perform the required operations.
• For I/O(input/output) instructions, the control unit generates enable signals for the I/O either to input data from or output data to external Devices.