#include <reg51.h>
#include <absacc.h>
void MSDelay(unsigned int itime);
void main()
  {
    unsigned char value;
    XDATA[0x4003] = 0x80;		
    while(1)
      {
        XDATA[0x4000] = 0xCC;
        MSDelay(500);
        XDATA[0x4000] = 0x99;
        MSDelay(500);
        XDATA[0x4000] = 0x33;
        MSDelay(500);
        XDATA[0x4000] = 0x66;
        MSDelay(500);
      }
  }
void MSDelay(unsigned int itime)
  {
    unsigned int i, j;
    for(i=0; i<itime; i++)
      for(j=0; j<1275; j++);
  }