interfacing adc 0804 with 89c51 simulation problem

[epple]

hi. i have a problem in simulation am using protues and have done coding in keil assembly language. adc is connected to p2 of 89c51 and i want to move the data from p2 to p3 ,as i change the value from variable resistor the values on data bits changes but am not getting output on p3. here is code and simulation jpeg. please help me

; ADC port using port 2
; WR ADC port 1.1
; RD ADC port 1.0
; CS ADC connect to ground
;=================================================

org 00h
mov p2, #0ffh
ADC:
clr P1.1
nop
nop
nop
setb P1.1
eoc:
jb P1.3,eoc
clr P1.0
mov A,P2
mov p3,A
setb P1.0
sjmp ADC

end

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