p3_3.c

单片机原理与应用实例教程 单片机原理与应用实例教程

#include "REG51.h"
main(){
	unsinged char data* pRAM = 0x00; 
	unsinged char temp = 0;
	ACC 		= pRAM[0x31];			/*第1步操作*/
	temp		= ACC;				/*第2步操作*/
	ACC		= pRAM[0x30];
	pRAM[0x30]	= temp;
	pRAM[0x31]	= ACC;				/*第3步操作*/
}

/*************************************************************
#include "REG51.h"
main(){
	unsinged char data* pRAM = 0x00; 
	unsinged char data* R = 0x00;
	R[3]	    	= pRAM[0x31];			/*第1步操作*/
	pRAM[0x31]	= pRAM[0x30];			/*第2步操作*/
	pRAM[0x30]	= R[3];				/*第3步操作*/
}

#include "REG51.h"
main(){
	unsinged char data* pRAM = 0x00;
	pRAM[SP]  	= pRAM[0x30];			/*第1步操作*/
	SP = SP + 1;
	pRAM[SP]	= pRAM[0x31];			/*第2步操作*/
	SP = SP + 1;
	pRAM[0x30]	= pRAM[SP];			/*第3步操作*/
	SP = SP - 1;
	pRAM[0x31]	= pRAM[SP];			/*第4步操作*/
	SP = SP - 1;
}
**************************************************************/