5_1.txt

This are the Laboratory programs for the 89c51

;PULSE OF D=50% ON P1.0 USING INTERRUPT METHOD
ORG 0000H
SJMP MAIN 
ORG 000BH
SJMP ISR
ORG 0030H
MAIN:
MOV TL0,#0CH
MOV TH0,#0FEH
SETB EA
SETB ET0
MOV TMOD,#01H
CLR P1.0
SETB TR0
ST:SJMP ST
ISR:
CLR TF0
CPL P1.0
MOV TL0,#0CH
MOV TH0,#0FEH
SETB TR0
RETI
END