ON 20021225@8:08:44 PM at page:
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YR-optusnet-E21 Yoga  Raj added 'Questions Pages:
/techref/index.htm
Personal Computer Technical Reference'

ON 20021225@8:11:17 PM at page:
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YR-optusnet-E21 Yoga  Raj added 'Questions Pages:
/techref/index.htm
Personal Computer Technical Reference'

ON 20021227@3:03:03 PM at page:
http://www.piclist.com/techref/member/YR-optusnet-E21/index.htm
YR-optusnet-E21 Yoga  Raj added 'Questions:

Hello,

I plan to make a flashing led project with the 18f452. When I step through the program with MP lab, there is no change in port b or c1/c2 values even though wgre is writting to it.
Where is the bug ?

Thanks ,

Yoga

; This is my first attempt
; in building a flashing LED using the 18f452 processor



	LIST P=18F452
        radix  dec

       include <p18F452.inc>



;************************************************************************************************************    
; Equates                                                                                                   ;
;************************************************************************************************************

; 		Program equates


c1     	equ     0x100
c2	equ	0x101


; 		User equates....

C      	equ     0
Z      	equ     2



;************************************************************************************************************

;   		Define

	#define		LED0	PORTB,0

	
;************************************************************************************************************

; The program begin here

       		org     0x00
;	Reset  
       		goto    START


;************************************************************************************************************

; INTERRUPT    (no interrupt was planned)


       		org  0x08       
			
	       	nop             	
                              
        	retfie          


;*************************************************************************************************************


; Subroutines 



DELAY				
    		movlw   0x02		
DEL  				
    		clrwdt 			
    		movwf   c2     		
LOOP1              		
    		movlw   0x02   		
    		movwf   c1     		
LOOP2              		
    		decfsz  c1,1   		
    		goto    LOOP2  		
    		decfsz  c2,1   		
    		goto    LOOP1  		
    		return  


;*************************************************************************************************************
	



	
;  		Main Program is here


START				; the begining of the program

		clrf	INTCON	; disable all interupts

		clrf	PORTB	; initialise portb
		clrf	LATB	; initialise all the output pins
		
		movlw	0x00	; w is b'00000000'
		movf	TRISB,1	; set all port b as output

		nop
		nop

LED
		
		bsf	LED0	; set the led on
;		call	DELAY

		bcf	LED0	; set the led off
;		call 	DELAY

		goto	LED     ; loop forever
						

 


	END'