dear raghu.

yes i made a mistake .what u said is correct.

sorry for the confusion.
here is the code of my adc interfacing prog.

is it correct?

mov p0,#0ffh
clr p3.3 ; select channel zero

clr p3.4
setb p3.4 ; enable ALE

setb p3.0 ;enable soc
nop
clr p3.0

here: jnb p3.6,here ;wait till conversion ends.
here1: jb p3.6,here1

setb p3.2
clr p3.2 ;output enable

mov a,p0