ASM program to exhibit the RAM direct addressing

AIM: To exhibit the RAM direct addressing and bit addressing schemes of 8051 microcontroller.

ALGORITHM:

1. For Bit addressing, Select Bank 1 of RAM by setting 3^rd bit of PSW
2. Using Register 0 of Bank 1 and accumulator perform addition
3. For direct addressing provide the address directly (30 in this case)
4. Use the address and Accumulator to perform addition
5. Verify the results

PROGRAM:

        SETB	PSW.3
        MOV	R0,#data1
        MOV	A,#data2
        ADD	A,R0
        MOV	DPTR,#4500
        MOVX	@DPTR,A
HERE:	SJMP	HERE

Direct Addressing:

        MOV	30,#data1
        MOV	A,#data2
        ADD	A,30
        MOV	DPTR,#4500
        MOVX	@DPTR,A
HERE:   SJMP	HERE

OBSERVATION:

Bit addressing:

Input:	54
	25
Output:	79 (4500)

Direct addressing:

Input:	54
	25
Output:	79 (4500)

RESULT:

Thus the program to exhibit the different RAM addressing schemes of 8051 was executed.