#include <iom16v.h>
unsigned char const SEGtable[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E};
//"0"~"F"對應的字形編碼，共陽極八段數碼管
main()
{
  unsigned char i,j;
  unsigned char counter=0;                //指示當前顯示的數字或者字符在表格中存放位置
  DDRD = 0xFF;
  PORTD = 0xFF;  						  //初始化PORTA
  while(1)
  {
    for(i=0;i<250;i++)                    //軟件延時
    {
      for(j=0;j<250;j++);
      for(j=0;j<250;j++);
      for(j=0;j<250;j++);
    }               
    if(counter>=15)                       //已經顯示到F，回到0繼續顯示
    {
      counter = 0;
    }
    else
    {
      counter++;                          //數字字符增加
    }
    PORTD = SEGtable[counter];               //輸出字符
  }
}