Assume that in the 0x12 address is stored 0xFD value Write a

Assume that in the 0x12 address is stored 0xFD value. Write a program to convert it to decimal. The decimal digits must be saved in the directions: (0x20, 0x21, 0x22) with the least significant bit starting at 0x20.

Solution

;NUMBER TO BE PLACED AT 30H
;RESULT WILL BE IN 20H,21H,22H
   LIST P=PIC16F877A
   #INCLUDE<P16F877A.INC>
   ORG 0000H
   CLRF STATUS
   MOVF 30H,0
   MOVWF 24H
   MOVLW 0X64 ;DIVIDE WITH 100D
   MOVWF 25H
   CLRF 22H
   CLRF 21H
LOOP:          
   SUBWF 24H,1
   INCF 22H
   BTFSC STATUS,0
   GOTO LOOP
   DECF 22H
   ADDWF 24H,1
   MOVLW 0X0A       ;DIVIDE WITH 10D
LOOP1:SUBWF 24H,1
   INCF 21H
   BTFSC STATUS,0
   GOTO LOOP1
   DECF 21H
   ADDWF 24H,0  
MOVWF 20H
   CLRF 24H
   CLRF 25H
   END