16 BIT ADDITION

MICROCONTROLLER (8051)

16 BIT ADDITION

AIM:

            To write an assembly language program in microcontroller to perform addition between two 16 bit numbers.

APPARATUS REQUIRED:

                                    8051 kit, power chord

ALGORITHM:

1.      Start the program.

2.      Get the first 8 bit data (MSB) of the 16 bit in accumulator.

3.      Add another 8 bit data (MSB) with the accumulator content.

4.      Move the address location to Data Pointer.

5.      Store the added result (MSB) in the Data Pointer.

6.      Get the first 8 bit data (LSB) of the 16 bit in accumulator.

7.      Add another 8 bit data (LSB) with the accumulator content.

8.      Increment the Data Pointer.

9.      Store the added result (LSB) in the Data Pointer.

10. Stop the program.

PROGRAM:      

ADDRESS	LABEL	OPCODE	MNEMONICS	OPERAND	COMMENTS
4100		C3	CLRC		Clear the content
4101		74	MOV	A, #Data M1	Move the data (MSB) 34 to accumulator.
4102		34
4103		24	ADD	A, #Data M2	Add the content of acc and the second MSB 78 data.
4104		78
4105		90	MOV	DPTR, #4150	Move the address location 4150 to DPTR.
4106		41
4107		50
4108		F0	MOVX	@DPTR,A	Move the content of accumulator to the address location (4150) in DPTR
4109		A3	INC	DPTR	Increment the content of DPTR.
410A		74	MOV	A, #Data L1	Move the data (LSB) 12 to accumulator
410B		12
410C		34	ADDC	A, #Data L2	Add the content of acc and the second (LSB) 56 data.
410D		56
410E		F0	MOVX	@DPTR,A	Move the content of accumulator to the address location (4151) in DPTR
410F		80	HERE:SJMP HERE
4110		FE

INPUT:

4102:34 (MSB)                                                                410B:12 (LSB)

4104:78 (MSB)                                                                410D: 56 (LSB)

OUTPUT:

4150: AC (MSB)                                                        4151:  68 (LSB)

 RESULT:

            Thus an assembly language program for the addition of two 16 bit numbers in microcontroller was written and executed successfully.