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problem with timer

kamala kamala

Can any one help me plz
This is the code for some delay on p1.0 pin

org 0000h
        mov tmod,#01h
 back:  mov th0,#0f0h
        mov tl0,#0f0h
        setb tr0
        cpl p1.0
  here: jnb tf0,here

        clr tr0
        clr tf0
        jmp back

         end

My problem is value in TL is not incrementing properly .TL is displaying only even numbers . TF is setting when ever T0 reg is becoming 0000 and port bit is also working properly.
TL value incrementing even TR0 falg is 0 again reloading with T0 value when TR0 is 1. And finally iam not getting the result when I loaded this code into controller.

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