By: Masud-ul-Hasan
24
Ex4-4: Buzzer Interface
(contd.)
DELAY:
MOV R7, #100
;for 100 loops
AGAIN:
MOV TH0, #D8H
;10000µsX100=1sec
MOV TL0, #F0H
;-10000=D8F0H
SETB TR0
WAIT:
JNB
TF0, WAIT
CLR
TF0
CLR
TR0
DJNZ
R7, AGAIN
RET
END