16-BIT SUBTRACTION

16-BIT SUBTRACTION

AIM:

To write an assembly language program for the subtraction of two 16 – bit numbers using 8085.

APPARATUS REQUIRED:

                                          8085 kit, power chord

ALGORITHM:

1.      Start the program                                               

2.      Load the data to HL pair register

3.      Exchange the content of HL and DE pair

4.      Load the data to HL pair register

            5. Subtract the content of E-register with the accumulator

5.      Store the content of accumulator to 5100     

6.      Move the content of H to Acc

7.       Subtract the content of accumulator to 5101

8.      Stop the program.

PROGRAM:      

ADDRESS	LABEL	OPCODE	MNEMONICS	OPERAND	COMMENTS
4500		2A, 00,55	LHLD	5500	Load the data1 to hl register.
4503		EB	XCHG		Move the content of de to hl register
4504		2A, 02,55	LHLD	5002	Load the data2 to hl pair register.
4507		7D	MOV	A, L	Move the content of l register to accumulator
4508		93	SUB	E	Subtract e register and accumulator
4509		32,00,51	STA	5100	Store the result
450C		7C	MOV	A, H	Move h register to accumulator
450D		9A	SBB	D	Subtract d register and accumulator
450E		32,01,51	STA	5101	Store the result.
4511		76	HLT		Stop the process

INPUT:         5500 – 77      5501 – 66                  OUTPUT:     5100 - 11

                        5502 – 88      5503 – 77                                          5101 - 11

RESULT:

            Thus the assembly language program for 16-bit subtraction is executed and the results are verified.