16f88 - pin RA4 as analog input

[savnik]

I have the below code with 16f88 , and i want to know if may use the pin RA4
as analog input.
I want to read the voltage from a tuner.The range of voltage is 0.5-3.5V.

            CMCON = 7                                  ' PortA = digital I/O
             
	DEFINE LCD_DREG	PORTB	'Selection of the port B
	DEFINE LCD_DBIT 0	    'Selection one RB0 with RB3
	DEFINE LCD_RSREG PORTA	'RS on port A
	DEFINE LCD_RSBIT 2	    'RS on RA2
	DEFINE LCD_EREG	PORTA   'E on port A
	DEFINE LCD_EBIT 3	    'E on RA3
	DEFINE LCD_BITS 4		'Mode 4 bits
	DEFINE LCD_LINES 2	    '2 lines

	DEFINE I2C_SCLOUT 1
	
	PAUSE 500
	
' ** DEFINITION OF THE ENTREES - EXITS

' Exits I2C

	SCL var PORTA.1         'SCL on RA1 (pine 18)
	SDA	var	PORTA.0		    'SDA on RA0 (pin 17)

' Boutons

	UP	    var	PORTB.6		'increase the frequency (on RB6)
	DOWN	var	PORTB.7		'decrease the frequency (on RB7)
	CH_PAS	var	PORTB.5		'Change the step of synth (on RB5) 
 
	
	Input	UP			    'Up and Down are entries
	Input	DOWN
	Input	CH_PAS