frequencytest.lst

利用单片机测频率

C51 COMPILER V6.23a  FREQUENCYTEST                                                         01/25/2005 10:42:34 PAGE 1   


C51 COMPILER V6.23a, COMPILATION OF MODULE FREQUENCYTEST
OBJECT MODULE PLACED IN FREQUENCYTEST.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE FREQUENCYTEST.C BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          
   2          
   3          #include<reg51.h>
   4          unsigned int count;
   5          unsigned long int time,frequency;
   6          bit flag;
   7          counter()
   8          {frequency=4*count/time;    //得到所的频率；
   9   1      count=0;time=0;flag=1;
  10   1      } 
  11          timer0() interrupt 1 using 1     //计数中断
  12          {count++;
  13   1      } 
  14          timer1() interrupt 3 using 3     //定时中断
  15          {time++;
  16   1      if(time==100){IE=0;counter();}      //关中断并转到处理函数；
  17   1      }
  18          main()
  19          { unsigned long int temp;
  20   1        P0=0;
  21   1        TMOD=0X2d;     //T1为定时方式，工作为2（即自重重载TH1），T0为计数方式，工作为1，计数位长16位；          
             -           
  22   1        TH1=0x05;TL1=0x05;//定时时间为250us;
  23   1        TCON=0x50;
  24   1        IE=1;
  25   1        IP=0x02;    //把T0的中断级设为最高
  26   1        while(1)
  27   1        {if(flag==1)
  28   2           {temp=frequency;
  29   3            frequency=0;
  30   3            flag=0;
  31   3            P0=!P0;                 //得到频率后处理程序
  32   3            IE=1;                   //处理服务程序后开中断；
  33   3            }  
  34   2            }                                                                                                   
             -   
  35   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    199    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =     10       4
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
END OF MODULE INFORMATION.


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