C51 COMPILER V7.09   MAIN                                                                  06/29/2006 11:56:21 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 BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*
   2                  main.c
   3                  CAT1021看門狗實(shí)驗(yàn)程序
   4          */
   5          
   6          
   7          #include <reg51.h>
   8          
   9          
  10          //定義I/O端口
  11          sbit LED = P0^0;
  12          sbit SCL = P3^4;
  13          sbit SDA = P3^5;
  14          
  15          
  16          /*
  17          函數(shù)：Delay()
  18          功能：延時(shí)0.001～65.536s
  19          參數(shù)：
  20                  t>0時(shí)，延時(shí)(t*0.001)s
  21                  t=0時(shí)，延時(shí)65.536s
  22          */
  23          void Delay(unsigned int t)
  24          {
  25   1              do
  26   1              {
  27   2                      TH0 = 0xFC;
  28   2                      TL0 = 0x66+17;
  29   2                      TR0 = 1;
  30   2                      while ( !TF0 );
  31   2                      TR0 = 0;
  32   2                      TF0 = 0;
  33   2              } while ( --t != 0 );
  34   1      }
  35          
  36          
  37          /*
  38          函數(shù)：Feed()
  39          功能：清除CAT1021內(nèi)部WDT定時(shí)器（喂狗）
  40          說明：如果沒有在1.6秒（典型值）內(nèi)喂狗，則CAT1021會(huì)輸出復(fù)位信號(hào)
  41          */
  42          void Feed()
  43          {
  44   1              SDA = 0;
  45   1              Delay(1);
  46   1              SDA = 1;
  47   1      }
  48          
  49          
  50          /*
  51          函數(shù)：SysInit()
  52          功能：系統(tǒng)初始化
  53          */
  54          void SysInit()
  55          {
C51 COMPILER V7.09   MAIN                                                                  06/29/2006 11:56:21 PAGE 2   

  56   1              LED = 0;        //點(diǎn)亮LED。如果CPU被看門狗復(fù)位，則能看到LED閃亮
  57   1              SCL = 1;
  58   1              SDA = 1;
  59   1              TMOD &= 0xF0;
  60   1              TMOD |= 0x01;
  61   1              Delay(250);             //上電后必須先延時(shí)200ms以上才能對(duì)CAT1021進(jìn)行操作
  62   1      }
  63          
  64          
  65          void main()
  66          {
  67   1              SysInit();
  68   1              for (;;)
  69   1              {
  70   2                      Feed();         //喂狗
  71   2                      Delay(800);     //延時(shí)
  72   2              }
  73   1      }
  74          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     71    ----
   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)