Unconditional Call Instruction
CALL ( Unconditional Call) Instructions :This instruction calls the subroutine program stored at memory location specified in the instruction. The specified memory address will be copied into the program counter register. But before coping the new address the previous contents of the program counter are stored into the stack. The instruction format is.
CALL 16 bit memory address
Hence it possible to come back to the original position after completing the subroutine program from where it is called.