delay loops into our program

Let us put these delay loops into our program, and finish off by making it a real program by adding comments:

;*****Set up the Constants**** 

STATUS         equ       03h

TRISA             equ       85h

PORTA           equ       05h

COUNT1        equ       08h

COUNT2        equ       09h

;****Set up the port****  

bsf                   STATUS,5

movlw              00h

movwf              TRISA

bcf                   STATUS,5

;****Turn the LED on**** 

Start               movlw        02h

movwf               PORTA                                                 

;****Start of the delay loop 1**** 

Loop1          decfsz      COUNT1,1

goto              Loop1 

decfsz           COUNT2,1

goto              Loop1   

;****Delay finished, now turn the LED off**** 

 movlw              00h 

movwf              PORTA 

;****Add another delay**** 

Loop2

decfsz             COUNT1,1

goto                 Loop2    

decfsz             COUNT2,1

goto                 Loop2

;****Now go back to the start of the program

goto                 Start

;****End of the program**** 

end                              ;Needed by some compilersand also just in case we miss the goto instruction.

 

 You can compile this program and then program the PIC.  Of course, you will want to try the circuit out to see if it really does work.  Here is a circuit diagram for you to build once you have programmed your PIC.