8 BIT MULTIPLICATION

8 BIT MULTIPLICATION

AIM:

            To write an assembly language program in microcontroller to perform multiplication between two 8 bit numbers.

APPARATUS REQUIRED:

                                    8051 kit, power chord

ALGORITHM:

1.      Start the program.

2.      Get the first 8 bit data in accumulator.

3.      Get the second 8 bit data in B reg.

4.      Multiply the two data.

5.      Move the address location to Data Pointer.

6.      Store the multiplied result (LSB) in the Data Pointer.

7.      Increment the Data Pointer.

8.      Move the content of B reg (MSB) to accumulator.

9.      Move the content of accumulator to the address location in DPTR.

10. Stop the program.

PROGRAM:      

ADDRESS	LABEL	OPCODE	MNEMONICS	OPERAND	COMMENTS
4300		74	MOV	A, #Data 1	Move the data (0A) to accumulator.
4301		0A
4302		75	MOV	B, #Data 2	Move the data (88) to B reg.
4303		F0
4304		88
4305		A4	MUL	A,B	Multiply the content of Acc and B reg.
4306		90	MOV	DPTR, #4500	Move the address location 4500 to DPTR.
4307		45
4308		00
4309		F0	MOVX	@DPTR,A	Move the content of accumulator to the address location (4500) in DPTR
430A		A3	INC	DPTR	Increment the content of DPTR.
430B		E5	MOV	A,B	Move the content of B to acc.
430C		F0
430D		F0	MOVX	@DPTR,A	Move the content of accumulator to the address location (4501) in DPTR
430E		80	HERE:SJMP HERE
430F		FE

INPUT:

4301: 0A                                                                   4304: 88

OUTPUT:

4500: 50 (LSB)                                                        4501: 05 (MSB)      

RESULT:

            Thus an assembly language program for the multiplication of two 8 bit numbers in microcontroller was written and executed successfully.