Notes
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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 253, 254, 254, 253, 252, 250
DB 248, 245, 242, 238, 234
DB 229, 224, 218, 212, 205
DB 199, 191, 184, 176, 168
DB 160, 152, 144, 135, 127
DB 118, 110, 102, 93, 85
DB 77, 70, 62, 55, 48
DB 42, 36, 30, 25, 20
DB 15, 12, 8, 5, 3
DB 1, 0, 0, 0, 0
DB 1, 3, 5, 8, 11
DB 15, 19, 24, 30, 35
DB 42, 48, 55, 63, 71
DB 79, 87, 95, 104, 113
DB 122, 130, 139, 148, 157
DB 166, 174, 183, 191, 199
DB 206, 213, 220, 226, 231
DB 236, 240, 244, 246, 248
DB 249, 249, 247, 244, 239
DB 232, 222, 206, 179, 146
DB 179, 206, 222, 232, 239
DB 244, 247, 249, 249, 248
DB 246, 244, 240, 236, 231
DB 226, 220, 213, 206, 199
DB 191, 183, 174, 166, 157
DB 148, 139, 130, 122, 113
DB 104, 95, 87, 79, 71
DB 63, 55, 48, 42, 35
DB 30, 24, 19, 15, 11
DB 8, 5, 3, 1, 0
DB 0, 0, 0, 1, 3
DB 5, 8, 12, 15, 20
DB 25, 30, 36, 42, 48
DB 55, 62, 70, 77, 85
DB 93, 102, 110, 118, 127
DB 135, 144, 152, 160, 168
DB 176, 184, 191, 199, 205
DB 212, 218, 224, 229, 234
DB 238, 242, 245, 248, 250
DB 252, 253, 254, 254, 200
END
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