4_3.txt

This are the Laboratory programs for the 89c51

;GENERATE PULSE OF 1K OF D=70% ON P1.0 AND SIMULTANEOUSLY PULSE OF 2K ON P1.1 WITH D=40%
ORG 0000H
SETB P1.0
SETB P1.1
MOV TMOD,#11H
MOV TL1,#0CH
MOV TH1,#0FEH
MOV TL0,#06H
MOV TH0,#0FFH
SETB TR1
SETB TR0
MOV TCON ,#50H
WAIT:MOV R2,TCON
 CJNE R2,#50H ,CHK
SJMP WAIT
CHK: JNB TF1 ,CHKTF0
CLR TR1
CLR TF1
CPL P1.0
MOV TL1,#0CH
MOV TH1,#0FEH
SETB TR1
SJMP WAIT
CHKTF0:
CLR TR0
CLR TF0
CPL P1.1
MOV TL0,#06H
MOV TH0,#0FFH
SETB TR0
SJMP WAIT
END