setport.asm

基于单片机Aduc841的调试程序

/******************************************************************
              汇编语言模拟SETPORT程序 
******************************************************************/      
/*****************************************************************************
*  =============================================================
*
*****************************************************************************/ 

PUBLIC	_SETPORT
SETPORT_ROUTINES  SEGMENT  CODE
RSEG  SETPORT_ROUTINES
DPP      DATA  084H  ;DATA POINTER - PAGE BYTE

_SETPORT:
    
   
    MOV DPP,R7;
    MOV DPH,R5;
    MOV DPL,#00H;
    MOV A,R3;
    MOVX @DPTR,A;
    NOP;
	NOP;
    NOP;
	NOP;
	NOP;
    NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
    NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
	NOP;
    MOV DPP,#00H;
    MOV DPH,#00H;
	RET
    END