//-----------------------------------------------------------------
        //  名稱: 8只數(shù)碼管滾動顯示單個數(shù)字
        //-----------------------------------------------------------------
        //  說明: 數(shù)碼管從左到右依次滾動顯示0～7，程序通過每次僅循環(huán)選通一只數(shù)碼管
        //  實現(xiàn)單只數(shù)碼管滾動顯示效果。
        //
        //-----------------------------------------------------------------
        #include <reg51.h>
        #include <intrins.h>
        #define uchar unsigned char
        #define uint  unsigned int
        //各數(shù)字的數(shù)碼管段碼
        uchar code DSY_CODE[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
        //-----------------------------------------------------------------
        // 延時
        //-----------------------------------------------------------------
        void DelayMS(uint x)
        { uchar i;
          while(x--) for(t = 0; i < 120; i++);
        }
        //-----------------------------------------------------------------
        // 主程序
        //-----------------------------------------------------------------
        void main()
        { uchar i,k = 0x80;
          while(1)
          { for(i = 0; i < 8; i++)
            {
                P2 = 0xFF;                    //關(guān)閉顯示
                k = _crol_(k, 1);
                P0 = DSY_CODE[i];             //發(fā)送數(shù)字段碼
                P2 = k;                       //發(fā)送數(shù)碼管位碼,打開對應(yīng)的數(shù)碼管
                DelayMS(300);
            }
          }
        }