Microprocessor
When RET instruction is executed by any subroutine then

 the PC will be incremented after the execution of the instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction.
 the top of the stack will be popped out and assigned to the PC.

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Microprocessor
Ready pin of microprocessor is used

 to introduce wait state
 to provide direct memory access
 to indicate that microprocessor is ready to receive inputs
 to indicate that microprocessor is ready to receive outputs

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