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MOV DPTR,#LOOK_UP_TABLE
MOV R2,#200
BACK:
CLR A
MOVC A,@A+DPTR
MOV P1,A ; sent to DAC
ACALL DELAY ; produce a freq.
INC DPTR
DJNZ R2,BACK
SJMP AGAIN
DELAY: ; Creates a delay of 250*2 machine cycles approximately 500us for each data.
MOV R0, #250
HERE: DJNZ R0, HERE
RET
ORG 300h
LOOK_UP_TABLE:
DB 4.5225,3.2725,1.7275,0.4775,0,0.4775,1.7275,3.2725,4.5225
DB 5.0000,4.5225,3.2725,1.7275,0.4775,0,0.4775,1.7275,3.2725
DB 4.5225,5.0000,4.5225,3.2725,1.7275,0.4775,0,0.4775,1.7275
DB 3.2725,4.5225,5.0000,4.5225,3.2725,1.7275,0.4775,0,0.4775
DB 1.7275,3.2725,4.5225,5.0000,4.5225,3.2725,1.7275,0.4775,0
DB 0.4775,1.7275,3.2725,4.5225,5.0000,4.5225,3.2725,1.7275,0.4775
DB 0,0.4775,1.7275,3.2725,4.5225,5.0000,4.5225,3.2725,1.7275
DB 0.4775,0,0.4775,1.7275,3.2725,4.5225,5.0000,4.5225,3.2725
DB 1.7275,0.4775,0,0.4775,1.7275,3.2725,4.5225,5.0000,4.5225
DB 3.2725,1.7275,0.4775,0,0.4775,1.7275,3.2725,4.5225,5.0000
DB 4.5225,3.2725,1.7275,0.4775,0,0.4775,1.7275,3.2725,4.5225
END
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