ORG 0000H
JMP START
ORG 0030H
START:
MOV TMOD,#20H
MOV PCON,#80H
MOV TH1,#0FDH
MOV SCON,#50H
MOV R0,#0AAH
SETB REN
SETB TR1
MOV A,R0
OUT3:CPL A
MOV SBUF,A
OUT1:JNB TI,OUT1
CLR TI
OUT2:JNB RI,OUT2
CLR RI
MOV A,SBUF
MOV P0,A
CALL DELAY
lJMP OUT3
DELAY:
MOV R6,#20
D:MOV R7,#25
D1:DJNZ R7,D
DJNZ R6,D
RET
END
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