1_3.txt

This are the Laboratory programs for the 89c51

;ADDITION OF TWO 16 BIT NOS
ORG 0000H
MOV DPTR,#2000H
MOVX A,@DPTR
MOV R0,A
MOV DPTR,#2002H
MOVX A,@DPTR
ADD A,R0
MOV R3, A
MOV DPTR, #2001H
MOVX A,@DPTR
MOV R1,A
MOV DPTR,#2003H
MOVX A,@DPTR
ADDC A,R1
MOV R2,A 
JNC XXX
MOV A,#01H
MOV DPTR,#3000H
MOVX @DPTR, A
XXX:
MOV A,R3
MOV DPTR,#3001H
MOVX @DPTR,A
MOV A,R2
MOV DPTR, #3002H
MOVX @DPTR,A
HERE: SJMP HERE
END