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乘法器的問題
#1
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你好 小弟使用本站的範例程式(乘法器)但是仍然跑不出所需的乘積 以下是小的簡單的程式 麻煩大家幫忙看看 謝謝大家
LIST    p=16F877
                    
#INCLUDE<p16F877.INC>
                                
x          equ     0x20     
        y          equ     0x21    
        res_lo  equ     0x22      
        res_hi  equ     0x23   

        ORG    00H



BSF        STATUS
,RP0     ;切換到BANK1    
CLRF                    TRISD    
;定PORTD為輸出接腳
CLRF    TRISC
BCF        STATUS
,RP0     ;切換到BANK0 
;        movlw    0xff
;        movwf    PORTD

main
:
           
BCF        STATUS,5
         BCF        STATUS
,6
        movlw   
B'10101010'
                          
movwf   x          
                        movlw   
B'01010101'
           
movwf   y 
        clrf       res_lo
        clrf       res_hi       
        call    ddd
bbb
:
                        
movf    x,w
        movwf    res_hi
;高位元放在res_hi            movwf    PORTC
        MOVF    res_lo
;高位元放在res_lo    
        movwf    PORTD
        
goto    main
      

ddd
:                        ;乘法器的副程式
       
     btfsc  y
,0
     
goto      l0
     btfsc  y
,1
     
goto      l1
     btfsc  y
,2
     
goto      l2
     btfsc  y
,3
     
goto      l3
     btfsc  y
,4
     
goto      l4
     btfsc  y
,5
     
goto      l5
     btfsc  y
,6
     
goto      l6
     btfsc  y
,7
     
goto      l7
     clrf   x     
     
goto   l8     
     
l0
:
     
rrf    x,f
                 rrf    res_lo
,f
                 btfsc  y
,1
                 addwf     x
,w
l1
:
     
rrf    x,f
                 rrf    res_lo
,f
                 btfsc  y
,2
                 addwf x
,w
l2
:
       
rrf    x,f
                rrf    res_lo
,f
                btfsc  y
,3
                addwf  x
,w
l3
:
    
rrf    x,f
                rrf    res_lo
,f
                btfsc  y
,4
                addwf  x
,w
l4
:
    
rrf    x,f
                rrf    res_lo
,f
                btfsc  y
,5
                addwf  x
,w

l5
:
    
rrf    x,f
                rrf    res_lo
,f
                btfsc  y
,6
                addwf  x
,w
l6
:
    
rrf    x,f
                rrf    res_lo
,f
                btfsc  y
,7
                addwf  x
,w
l7
:
    
rrf    x,f
                rrf    res_lo
,f
l8
:
                 RETURN
        
    
END





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發表於: 2006/9/21 19:54
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