watchdog.lst

这是单片机C51典型应用设计代码

C51 COMPILER V6.14h  WATCHDOG                                                              08/31/2001 12:56:29 PAGE 1   


C51 COMPILER V6.14h, COMPILATION OF MODULE WATCHDOG
OBJECT MODULE PLACED IN watchdog.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE watchdog.c DEBUG OBJECTEXTEND

stmt level    source

   1          /*------------------------------------------------------------------------------
   2          watchDog.c : Sample Program that demonstrates the watchdog timer for the
   3          following microcontrollers
   4          
   5          Dallas Semiconductor DS80C320
   6          Dallas Semiconductor DS80C323
   7          
   8          Copyright (c) 1988-2001 Keil Elektronik GmbH and Keil Software, Inc.
   9          All rights reserved.
  10          --------------------------------------------------------------------------*/
  11          
  12          #include <stdio.h>
  13          
  14          sfr WDCON  = 0xD8;
  15          sfr CKCON  = 0x8E;
  16          sfr TA     = 0xC7;
  17          
  18          sfr SCON0  = 0x98;
  19          sfr TMOD   = 0x89;
  20          sfr TH1    = 0x8D;
  21          sbit TR1   = 0x88^6;
  22          sbit TI    = SCON0^1;
  23          
  24          void reset_Watchdog( void )
  25          {
  26   1        WDCON |= 0x02;
  27   1      }
  28          
  29          
  30          /*------------------------------------------------------------------------------
  31          main() : Runs a while loop that simulated a condition that will cause the 
  32          		 watchdog timer to reset the microcontroller
  33          ------------------------------------------------------------------------------*/
  34          void main( void )
  35          {
  36   1      
  37   1        int i;
  38   1      
  39   1        /*------------------------------------------------
  40   1      	Setup the serial port for 1200 baud at 16MHz.
  41   1      	------------------------------------------------*/
  42   1          SCON0 = 0x50;		        /* SCON: mode 1, 8-bit UART, enable rcvr      */
  43   1          TMOD |= 0x20;               /* TMOD: timer 1, mode 2, 8-bit reload        */
  44   1          TH1   = 221;                /* TH1:  reload value for 1200 baud @ 16MHz   */
  45   1          TR1   = 1;                  /* TR1:  timer 1 run                          */
  46   1          TI    = 1;                  /* TI:   set TI to send first char of UART    */  
  47   1      
  48   1        if(  WDCON & 0x04 )
  49   1        {
  50   2          printf("Watchdog Reset Occured\n");
  51   2      	WDCON &= ~0x04;
  52   2        }
  53   1      
  54   1        WDCON |= 0x01;		//Enable the Watchdog timer
  55   1        CKCON |= 0xC0;		//Set rest time to 2684.38ms
C51 COMPILER V6.14h  WATCHDOG                                                              08/31/2001 12:56:29 PAGE 2   

  56   1      
  57   1        TA = 0xAA;			//Accessing timed access in order to start the watchdog timer
  58   1        TA = 0x55;			//
  59   1      
  60   1        WDCON |= 0x02;		//Start watch dog timer
  61   1      
  62   1        for( i = 0; i < 500; i++)
  63   1        {
  64   2          reset_Watchdog();
  65   2        }
  66   1      
  67   1        while(1)
  68   1        {
  69   2        	//Simulating a error that would cause the watchdog timer to reset processor
  70   2        }
  71   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     68    ----
   CONSTANT SIZE    =     24    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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