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problem with ADC channel0(PIN E3)

I have a problem in using ADC.While i'm using any channel,it gives the correct sampling result.But i found another fact that channel 0(pin E3 ) is always adc enabled.But if i select another channel,it gives me right output,but E3 is always ADC enabled.Then when i configured PIN E3 as output,this problem was cleared.Else ,pin E3 ia always ADC enabled.Why?