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Re: 關於RETLW指令..
#2
版主
版主


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retlw 的後面要跟著一個 立即數,例如 : retlw 0x3A 載入0x3A 到 W Reg. 後返回。

此種方式常用於 PIC16F 系列的查表應用如下所示:
org    0x10
    clrf    PCLATH
    movf     DisplayValue
,W
    call    SevenSegmentDecode
    movwf    PORTB
    
goto    Continue
SevenSegmentDecode
    addwf    PCL
,F    
    retlw    B’00111111’ 
;decode 0
    retlw    B’00000110’ 
;decode 1
    retlw    B’01011011’ 
;decode 2
    retlw    B’01001111’ 
;decode 3
    retlw    B’01100110’ 
;decode 4
    retlw    B’01101101’ 
;decode 5
    retlw    B’01111101’ 
;decode 6
    retlw    B’00000111’ 
;decode 7
    retlw    B’01111111’ 
;decode 8
    retlw    B’01101111’ 
;decode 9

發表於: 2008/10/16 8:22
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關於RETLW指令..
#1
資深會員
資深會員


查看用戶資訊
Dear All ;

retlw 0 --> return with w = 0,

如果返回時, 想把W內的值帶回是不是如此寫呢?
retlw w

3Q lor!!!

發表於: 2008/10/16 4:54
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