Microprocessor
The operations executed by two or more control units are referred as

 Bi control-operations
 Multi-operations
 Micro-operations
 Macro-operations

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Microprocessor
When RET instruction is executed by any subroutine then

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

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