OK, I fixed the flaws as Chris and Andrew said.To read
the ADRESH:ADRESL I used the following code:

            bsf   STATUS,RP0       ;bank 1
                movf    ADRESL,W
                movwf   L_byte

                bcf       STATUS,RP0     ;bank 0
                movf    ADRESH,W
              movwf   H_byte

     ;L_byte and H_byte are registers where the result
      ;is stored and then transformed to BCD using
four       ;additional registers-R0,R1,R2,R3.These
registers       ;(numbers) are displayed on the LCD

but the result wasn't too encouraging - the LCD showed
correspondingly 0000,0256,0512 and 0768 ,i.e. only the
two bits of the ADRESH. When I used only ADRESL
(H_byte=0) the LCD showed 0000 regardless of changing
the voltage from 0V to 5V.
So,I think the ADRESL is always empty.I don't know
why!
The following is the Initiation of the ADC:

         InitADC
                bsf       STATUS,RP0   ;bank 1
                movlw     B'10000000'  ;right justif.
            movwf         ADCON1           ;all Analog
                clrf      ADRESL

                bcf       STATUS,RP0   ;bank 0
            movlw   B'11000001'  ;RC osc,ch 0(RA0),
             movwf   ADCON0       ;Conv. stopped,ADC
ON
                clrf      ADRESH

         return

Any ideas?

Bye
Stefan




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