ADCIN and DT´s ALLDIGITAL

Hello

The PBP manual says this about ADCIN

Quote:

Before ADCIN can be used, the appropriate TRIS register must be set to
make the desired pins inputs. The ADCON, ANCON and/or ANSEL
registers must also be set to assign the desired pins to analog inputs

I want a value between 0-255 depending on the voltage (0-5V) on RA2 and was trying to set the registers without success and then I just tested the code below with Darrel Taylors ALLDIGITAL included and no additional register configurations and it works?

But I wonder why it works without setting the registers, and should I set them even if the code works and why?

Maybe a dumb question but I want to know :confused:
The PIC is an 16F886.

Code:

DEFINE OSC 4 include "ALLDIGITAL.pbp" ; Darrel Taylors ALLDIGITAL DEFINE SHOWDIGITAL 1 ;----[16F886 Hardware Configuration]-------------------------------------------- ASM cfg1 = _INTRC_OSC_NOCLKOUT ; INTOSCIO oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN cfg1&= _WDT_OFF ; WDT disabled and can be enabled by SWDTEN bit of the WDTCON register cfg1&= _PWRTE_ON ; PWRT enabled cfg1&= _MCLRE_OFF ; RE3/MCLR pin function is digital input, MCLR internally tied to VDD cfg1&= _CP_OFF ; Program memory code protection is disabled cfg1&= _CPD_OFF ; Data memory code protection is disabled cfg1&= _BOR_ON ; BOR enabled cfg1&= _IESO_OFF ; Internal/External Switchover mode is disabled cfg1&= _FCMEN_ON ; Fail-Safe Clock Monitor is enabled cfg1&= _LVP_OFF ; RB3 pin has digital I/O, HV on MCLR must be used for programming cfg1&= _DEBUG_OFF ; In-Circuit Debugger disabled, RB6/ICSPCLK and RB7/ICSPDAT are general purpose I/O pins __CONFIG _CONFIG1, cfg1 cfg2 = _BOR21V ; Brown-out Reset set to 2.1V cfg2&= _WRT_OFF ; Write protection off __CONFIG _CONFIG2, cfg2 ENDASM ;===LCD Defines for EasyPIC5==================================================== DEFINE LCD_DREG PORTB ; Set LCD Data port DEFINE LCD_DBIT 0 ; Set starting Data bit (0 or 4) if 4-bit bus DEFINE LCD_RSREG PORTB ; Set LCD Register Select port DEFINE LCD_RSBIT 4 ; Set LCD Register Select bit DEFINE LCD_EREG PORTB ; Set LCD Enable port DEFINE LCD_EBIT 5 ; Set LCD Enable bit DEFINE LCD_BITS 4 ; Set LCD bus size (4 or 8 bits) DEFINE LCD_LINES 2 ; Set number of lines on LCD 'DEFINE LCD_COMMANDUS 1500 ; Set command delay time in us 'DEFINE LCD_DATAUS 44 ; Set data delay time in us ;------------------------------------------------------------------------------- Level var byte Main: ADCIN 2, Level LCDOUT $FE,1 LCDOUT $FE,1, "Level:", #Level pause 200 goto main