BTFSS INSTRUCTION  IN ASSEMBLER FOR PIC18F

In this sample, we show that how to use a switch input to make an action.

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list p=18f2550
include "P18F2550.INC"
  ;Bits de configuration
        CONFIG FOSC = HS 
        CONFIG PWRT = OFF                  ; Power-up Timer OFF
        CONFIG BOR = OFF                     ; Brown-out OFF
        CONFIG WDT = OFF;
        CONFIG MCLRE = ON
        CONFIG PBADEN = OFF
        CONFIG LVP = OFF
        CONFIG DEBUG = OFF
        CONFIG XINST = OFF
        
; CODE ******************************************************
#define Led PORTB, 4
ORG  0x00
; start from 0x00 address
GOTO START
;jump to start label.
ORG  0x50 ; space for IRS
START
MOVLW 0x0F;
MOVWF TRISA
CLRF  PORTB; PORTB = 0x00
CLRF TRISB;
MOVLW 0x0F;
MOVWF ADCON1
LOOP
BTFSS PORTA,0;skip next instruction if RB0 = 1 
GOTO LEDOFF;    RB0 = 0, 
BSF Led;    LED is on now
BRA LOOP   ; Branch to START
LEDOFF
BCF Led;    LED is OFF.
BRA START
END;END of program.


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