oriol escote wrote:
>
> Hi,
> Colud anybody tell me where I can found an example program or tutorial about
> PIC16F873 Analog/Digital converter.
>
> Thanks

I have am A2D tutorial in PDF format that also uses an LCD if you are
interested. It includes 6 ASM files which can be simulated in MPLAB, or
programmed into a 16F873. Let me know if you want a copy.


This simple program will read PORTA pin 0, but not much explanation...


;
        Title "Analog example"
;
        list P = 16F873
;
        include "P16f873.inc"
;
; CRYSTAL SPEED = 4000000Hz
;
;
; ----------------
; CODE BEGINS HERE
; ----------------
;
        org 0x0000


Start   movlw b'00000000'       ; all port pins = low
        movwf PORTA
        movlw b'00000000'
        movwf PORTB
        movlw b'00000000'
        movwf PORTC
        bsf STATUS,RP0
        movlw b'00000001'       ; all port pins = output
        movwf TRISA             ; except RA0
        movlw b'00000000'
        movwf TRISB
        movlw b'00000000'
        movwf TRISC
;
; -------------------------
; ENABLE RA0 ONLY AS ANALOG
; -------------------------
; data is right justified in ADRESH and ADRESL
;
        movlw b'10001110'
        movwf ADCON1
        bcf STATUS,RP0
;
; --------------------------------------
; ENABLE THE ANALOG TO DIGITAL CONVERTOR
; --------------------------------------
;
        movlw b'11000001'       ; A2D clock = RC, Ch 0, A2D = on
        movwf ADCON0
;
; --------------------
; START A2D CONVERSION
; --------------------
;
        bsf ADCON0,GO_DONE
;
; -------------------------------
; WAIT FOR CONVERSION TO COMPLETE
; -------------------------------
;
A2Dwait btfsc ADCON0,GO_DONE    ; completed when GO_DONE = 0
        goto A2Dwait
;
; ------------------------------
; RESULT IS IN ADRESH AND ADRESL
;  xxxxxx00 00000000
; ------------------------------
;

; do something with A2D result

Here    goto Here
;
        end





--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.