#include <at89x51.h>
#include <stdio.h>

void main(void)
{ 	
char xdata * XROM;
	char a;
	int Aa = 0xFB1C;
	long Ba = 0x893B7832;
	float Ca = 3.4534;
	SCON = 0x50; //串口方式1,允許接收
	TMOD = 0x20; //定時器1定時方式2
	TH1 = 0xE8;	//11.0592MHz 1200波特率
	TL1 = 0xE8;
	TI = 1;
	TR1 = 1; //啟動定時器
XROM=(char xdata *) 0xB012; //給指針變量賦XROM初值
	*XROM = ‘R’; //給XROM指向的絕對地址賦值
	a = *((char xdata *) 0xB012); //等同于a = *XROM
	printf (“%bx %x %d %c \n”,(char) Aa, (int) Ba,(int)Ca, a);//轉(zhuǎn)換類型并輸出
	while(1);
}