#include <at89x51.h>
#include <intrins.h>
typedef unsigned int uint;
typedef unsigned char uchar;
void ChangeMemPage(uchar p)
{
 	P3_5=0;
 	P0=p|0x10;
 	P3_5=1;
 	P0=p|0x10;
  	P3_5=0;
}