I never use PIC1400 but the following work on 16F877 without using ADCIN, maybe you can use a part of it. Compare both datasheet may help if there's any difference between both

Code:
A_D_Val  VAR BYTE

TRISA = %11111111  ; Set PORTA to all input
ADCON1 = %00000010 ; Set PORTA analog and LEFT justify result
ADCON0 = %11000001 ; Configure and turn on A/D Module
Pause 500

Start: 	
ADCON0.2 = 1 ;Start Conversion

ConversionNotcomplete:	
     pause 10
     if ADCON0.2 = 1 Then ConversionNotComplete
     adval = ADRESH				    
     Lcdout $fe, 1,"Result=",DEC A_D_Val
     Pause 200
     Goto Start
hope this may help!!!