frequency and duty cycle??

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what , how obtain frequency , duty cycle of sqaure wave generated following code?

             mov  tmod,#2h
             mov  th0,#-250
again:   setb  p1.4
             acall delay
             clr    p1.4
             acall delay
             sjmp  again
delay:    setb  tr0
back:     jnb    tf0,back
             clr    tr0
             clr    tf0

check out http://tscm.com/dutycy.pdf sorry cant more


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