Question

B) Write a program to find the sum of the values ​​A5H, 69H, E2H and CCH. Put the result in the R2 for high byte and R4 for low byte. What is the result value expected.

Answer 1

Here I am using 8051 Microcontroller programming

ORG 0000H
MOV DPTR ,#90H ## Here give count as 4
MOVX A,@DPTR
MOV R0,A
INC DPTR ## As it increments load the values in #91H,#92H,#93H,#94H
MOVX A,@DPTR
DEC R0
BACK:MOV R1,A
INC DPTR
MOVX A,@DPTR
ADD A,R1
DJNZ R0 , BACK
INC DPTR
MOVX @DPTR,A
INC DPTR
MOV A,#00H
JNC UP
ADD A,#02H
UP:MOVX @DPTR ,A
HERE: SJMP HERE
END

output : 02BCH

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