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The instruction RET executes with the following series of machine cycle

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ESE Electrical 2016 Paper 2: Official Paper
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  1. Fetch, read, write
  2. Fetch, write, write
  3. Fetch, read, read
  4. Fetch, read

Answer (Detailed Solution Below)

Option 3 : Fetch, read, read
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RET (Return):

  • Return to main program unconditionally.
  • It is a one-byte instruction.
  • The execution of this instruction takes three machine cycle i.e. fetch, read, read
  • In first machine cycle, microprocessor fetches the opcode, during second and third machine cycles, it reads the contents of top of stack.
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