main.lst

一些简单的c51程序

C51 COMPILER V7.09   MAIN                                                                  06/18/2004 09:24:38 PAGE 1   


C51 COMPILER V7.09, COMPILATION OF MODULE MAIN
OBJECT MODULE PLACED IN main.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE main.c DEBUG OBJECTEXTEND

line level    source

   1          #include <reg51f.h>
   2          
   3          /*------------------------------------------------
   4          This function adjusts the watchdog timer compare
   5          value to the current PCA timer value + 0xFF00.
   6          
   7          Note that you must write to CCAP4L first, then
   8          write to CCAP4H.
   9          ------------------------------------------------*/
  10          void watchdog_reset (void)
  11          {
  12   1      unsigned int newval;
  13   1      
  14   1      newval  = (CH << 8) | CL;
  15   1      newval += 0xFF00;
  16   1      
  17   1      CCAP4L = newval;
  18   1      CCAP4H = newval >> 8;
  19   1      }
  20          
  21          /*------------------------------------------------
  22          MAIN C function
  23          ------------------------------------------------*/
  24          void main (void)
  25          {
  26   1      unsigned int i;
  27   1      
  28   1      /*--------------------------------------
  29   1      Configure PCA Module 4 as the watchdog
  30   1      and make sure it doesn't time-out
  31   1      immediately.
  32   1      --------------------------------------*/
  33   1      watchdog_reset ();
  34   1      CCAPM4 = 0x48;
  35   1      
  36   1      /*--------------------------------------
  37   1      Configure the PCA for watchdog timer.
  38   1      --------------------------------------*/
  39   1      CMOD = (CMOD & 0x01) | 0x40;
  40   1      
  41   1      /*--------------------------------------
  42   1      Start the PCA Timer.
  43   1      
  44   1      From this point on, we must reset the
  45   1      watchdog timer every 0xFF00 clock
  46   1      cycles.  If we don't the watchdog timer
  47   1      will reset the MCU.
  48   1      --------------------------------------*/
  49   1      CR = 1;
  50   1      
  51   1      /*--------------------------------------
  52   1      Do something for a while and make sure
  53   1      that we don't get reset by the watchdog.
  54   1      --------------------------------------*/
  55   1      for (i = 0; i < 1000; i++)
C51 COMPILER V7.09   MAIN                                                                  06/18/2004 09:24:38 PAGE 2   

  56   1        {
  57   2        watchdog_reset ();
  58   2        }
  59   1      
  60   1      /*--------------------------------------
  61   1      Stop updating the watchdog and we should
  62   1      get reset.
  63   1      --------------------------------------*/
  64   1      while (1)
  65   1        {
  66   2        }
  67   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     54    ----
   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)