#include<absacc.h>
#include<reg51.h>
#define DA0832 XBYTE[0xfffe]
#define uchar unsigned char
#define uint unsigned int
void stair(void)
{
  uchar i;
  while(1)
  {
     for(i=0;i<255;i++)
	 DA0832=i;
   }
}