ljw.lst

通过单片机的I/O引脚以软件延时方式产生方波

C51 COMPILER V7.07   LJW                                                                   11/09/2007 22:35:44 PAGE 1   


C51 COMPILER V7.07, COMPILATION OF MODULE LJW
OBJECT MODULE PLACED IN ljw.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE ljw.c

stmt level    source

   1          //功能说明:
   2          //通过单片机的I/O引脚以软件延时方式产生方波，使蜂鸣器发出声音。
   3          
   4          #include<AT89X51.h>            
   5          void delay250( unsigned int k );
   6          main( )                         
   7          {   
   8   1        for (;;)                    
   9   1         {
  10   2          while(P2_7==0)              
  11   2         {              
  12   3            P3_4=0;                   
  13   3                  delay250(2);                
  14   3            P3_4=1;                   
  15   3                  delay250(2);                
  16   3           }       
  17   2         }                                           
  18   1      }
  19          void delay250(unsigned int k)    
  20          {  
  21   1        unsigned int j,i;
  22   1        for(i=0;i<k;i++)
  23   1        {
  24   2         for(j=0;j<25;j++); 
  25   2        }
  26   1      }        


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     55    ----
   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)