exp2b_2.asm

来自「(Ebook-Pdf) Dsp - Real Time Digital Sign」· 汇编 代码 · 共 38 行

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*   exp2b_2: Direct Addressing Mode
*
* * * * * * * * * * * * * * * * * * * * * * * * * * *

    .def    _exp2b_2 
	
    .ref    _Xi

    .text

_exp2b_2                                     
;
;   Direct addressing
;	
              
    btstclr #14,*(ST1),TC1 ; Turn off CPL bits for direct addressing mode
    amov  #_Xi,XDP         ; Load direct addressing data-page pointer
    .dp   _Xi          
	
    mov   #9,@_Xi          ; Direct addressing mode
    mov   #3,@_Xi+1        ; Initialize Xi[8]={9,3,2,0,1,9,7,1}
    mov   #2,@_Xi+2	
    mov   #0,@_Xi+3	
    mov   #1,@_Xi+4	
    mov   #9,@_Xi+5	
    mov   #7,@_Xi+6
    mov   #1,@_Xi+7  
         
    xcc   continue,TC1         
    bset  CPL              ; Turn CPL bit back on             
continue
	
    ret	                      
	
    .end