#include<p18f4550.inc>
NUM1L EQU 0X20
NUM1H EQU 0X21
EXT_L EQU 0X22
EXT_H EQU 0X23
 
NUM2L EQU 0X24
NUM2H EQU 0X25
 
RES0 EQU 0X26 ;LSB
RES1 EQU 0X27
RES2 EQU 0X28
RES3 EQU 0X29 ;MSB
 
COUNT EQU 0X30
   ORG 0X0000
 MOVLW 0XCD
 MOVWF NUM1L
 MOVLW 0XAB
 MOVWF NUM1H
 CLRF EXT_L
 CLRF EXT_H
 
 MOVLW 0X34
 MOVWF NUM2L
 MOVLW 0X12
 MOVWF NUM2H
 
CLRF RES0
CLRF RES1
CLRF RES2
CLRF RES3
CLRF EXT_L
CLRF EXT_H,W
 
MOVLW 0X10
MOVWF COUNT
 
MULTI_LOOP
RRCF NUM2H,F
RRCF NUM2L,F
 
BNC SHIFT_ONLY
 
MOVF NUM1L,W
ADDWF RES0,F
MOVF NUM1H,W
ADDWFC RES1,F
MOVF EXT_L,W
ADDWFC RES2,F
MOVF EXT_H,W
ADDWFC RES3,F
 
RLCF NUM1L,F
RLCF NUM1H,F
RLCF EXT_L F
RLCF EXT_H,F
 
DECFCSZ COUNT,F
GOTO MULT_LOOP
END

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