PIC microcontroller flashing program-EEWORLD

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#INCLUDE "P16F877.inc" ;Chip model

 
   org   000h
   GOTO a1
   org   1ch
 
;************************************************
; Main program
;************************************************  
a1   
   BSF STATUS, RP0; Select body 1
   BCF STATUS,RP1  
   MOVLW 00H; Set RD port as output port
   MOVWF TRISD        
   BCF STATUS, RP0; Select body 0
   MOVLW 00H ;
   MOVWF PORTD; RD port outputs low level
   CALL M001 ; Delay
   MOVLW 0FFH ;
   MOVWF PORTD; RD port outputs high level
   CALL M001 ; Delay
   goto a1 ; execute repeatedly
;****************************************************
; Delay subroutine
;****************************************************
M001
   MOVLW 4
   MOVWF  30H
M002  MOVLW  250
   MOVWF  31H
M003  MOVLW  248
   MOVWF 32H
   DECFSZ  32H,1  
   GOTO  $-1
   DECFSZ  31H,1  
   GOTO  M003
   DECFSZ 30H, 1  
   GOTO  M002
   RETURN
;*******************************************************
; End of program
;*******************************************************   
   end

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