Problem with ADC

[savnik]

I have this configuration in my program

' ******************************** LCD **************************************

    DEFINE LCD_DREG PORTB		    'Selection of the port B
    DEFINE LCD_DBIT 4
    DEFINE LCD_RSREG PORTB		    'RS on port RA1
    DEFINE LCD_RSBIT 2
    DEFINE LCD_EREG PORTB		    'E on port RA0
    DEFINE LCD_EBIT 3
    DEFINE LCD_BITS 4		        'Mode 4 bits
    DEFINE LCD_LINES 4		        'LCD 4 lines of 16 caracter
    
	PAUSE 500

' Define ADCIN parameters
    
    DEFINE  ADC_BITS        8     	'Set number of bits in result
    DEFINE  ADC_CLOCK       3     	'Set clock source (3=rc)
    DEFINE  ADC_SAMPLEUS    50    	'Set sampling time in uS
	
    INCLUDE "LCDbar_INC.bas"        'Include the BARgraph routines
		
    CMCON = 7                       'PortA = digital I/O    
	ANSEL = %00000111               'Will set RA2 as analog and all others as digital

and this asm: (is for frequency meter)

Asm
	movlw   0x10	       ;PORTA 4 in entry
	movwf   0x5
	MOVLW	0x37
        option      	   ;charge 00110111 in the register option
	MOVLW	0x10		   ;init freq with RA4 in entry
	MOVWF	_trisabuf
EndAsm

and this asm: (is for frequency meter)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;    AUTHORIZATION OF COUNTING

	       clrf    TMR0		        ; RAZ timer
	       bsf	    _trisabuf,3	    ; RA4 in entry and RA3 in entry authorization counting
	       movf 	_trisabuf,W
	       tris	   PORTA
	
;;;;;;;;;;;;;;;;;;;;;;;;;;;;    BASE TIME  
      
	       movf	   _TEMPS,W
           movwf   _COUNT1
dxxx	   nop
	       decfsz  _COUNT1
	       GoTo	dxxx
	       nop
	       nop
	       Call delay
	       Call delay
	       Call delay
	       Call delay
	       Call delay
	
;;;;;;;;;;;;;;;;;;;;;;;;;;;      STOP OF COUNTING

	       bcf     _trisabuf,3	 ;RA4 in entry and RA3 at Exit to block counting
	       movf    _trisabuf,W         
	       tris    PORTA

My problem is the pot not adjust the volt. Show on lcd only if it is full. If i turn litle the pot the volt go to 0volt on lcd.
If i remove the two code : tris PORTA on asm code at the end of code the pot adjust linear, but the frequency meter
is not show properly.
In the image the resistor is 47omh and the pot 47kohm