Hi Russel, thanks for your answer.
I think is already shifting the LSB from ADC value here (maybe I wrong?)

READ0:  CALL READ           ; Read ADC
        MOV P1,A
        CLR C               ; Midi adjust (MSB must be 0)
        RRC A               ; Midi adjust
        MOV TP,@R0
        CJNE A,TP,SEND0
        JMP INCI            ; EQUAL read next
SEND0:  MOV @R0,A
        CALL SEND

About average of values, I dont understand how to do this with right shift, can you explain for me?

I dont understand from where this noise comes, I have isolated the circuit and suplying with batteries for no noise and this happens, maybe something wrong, can my adc be bad? Have some substition for my circuit? A better way to do?

Thanks.