led3.lst

51单片机实验例程

C51 COMPILER V7.10   LED3                                                                  10/28/2009 22:57:14 PAGE 1   


C51 COMPILER V7.10, COMPILATION OF MODULE LED3
OBJECT MODULE PLACED IN led3.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE led3.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /**************************************************************************************
   2          *                             LED闪烁的简单试验                                                                                           *
   3          *                延时实现p2口LED流水灯效果 （用循环移位指令）                                 *
   4          *       连接方法： JP11（P2）和JP1(LED灯) 用8PIN排线连接起来                                                      *
   5          *                                                                                                                                                                         *
   6          ***************************************************************************************/
   7          #include <reg51.h>          //此文件中定义了51的一些特殊功能寄存器
   8          //#include <intrins.h>
   9          
  10          void delayms(unsigned char ms)  
  11          // 延时子程序
  12          {                                               
  13   1              unsigned char i;
  14   1              while(ms--)
  15   1              {
  16   2                      for(i = 0; i < 120; i++);
  17   2              }
  18   1      }
  19          
  20          
  21          main()
  22          {
  23   1              unsigned char LED;
  24   1              LED = 0xfe;       //0xfe = 1111 1110
  25   1              while(1)
  26   1              {
  27   2               P2 = LED;
  28   2                       delayms(250);
  29   2                       LED = LED << 1;    //循环右移1位，点亮下一个LED "<<"为左移位
  30   2                       if(LED == 0x00 )        {LED = 0xfe;  } // 0xfe = 1111 1110
  31   2                       
  32   2                       
  33   2              }
  34   1      }
  35          
  36          
  37          
  38          
  39          
  40          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     37    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)