C51 COMPILER V7.02b   PWM                                                                  12/10/2005 20:24:09 PAGE 1   


C51 COMPILER V7.02b, COMPILATION OF MODULE PWM
OBJECT MODULE PLACED IN PWM.OBJ
COMPILER INVOKED BY: E:\EDATOOLS\KEILC7.0\C51\BIN\C51.EXE PWM.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          /*****************************************/
   2          /* Copyright (c) 2005, 通信工程學(xué)院      */
   3          /* All rights reserved.                  */
   4          /* 作    者：戴 佳                                       */
   5          /*****************************************/
   6          
   7          #include "PWM.h"
   8          
   9          /* 定時(shí)器0中斷服務(wù)子程序 */
  10          void timer0_int() interrupt 1 using 1
  11          {
  12   1              TR0 = 0;                                                // 關(guān)閉T0
  13   1      
  14   1              TH0 = -(20000/256);                             // 重置20ms定時(shí)器的計(jì)數(shù)初值
  15   1              TL0 = -(20000%256); 
  16   1      
  17   1              /* 用8254計(jì)數(shù)器發(fā)送第1路PWM信號(hào) */
  18   1              COMWORD = 0x30;
  19   1              // 1MHz時(shí)鐘作為計(jì)數(shù)時(shí)鐘，計(jì)數(shù)1000次，實(shí)現(xiàn)1ms高電平
  20   1              COUNT0 = 0xE8; 
  21   1              COUNT0 = 0x03;
  22   1      
  23   1              /* 用8254計(jì)數(shù)器發(fā)送第2路PWM信號(hào) */
  24   1              COMWORD = 0x70;
  25   1              // 1MHz時(shí)鐘作為計(jì)數(shù)時(shí)鐘，計(jì)數(shù)2000次，實(shí)現(xiàn)2ms高電平
  26   1              COUNT0 = 0xD0;
  27   1              COUNT0 = 0x07;
  28   1      
  29   1              /* 用8254計(jì)數(shù)器發(fā)送第3路PWM信號(hào) */
  30   1              COMWORD = 0xB0;
  31   1              // 1MHz時(shí)鐘作為計(jì)數(shù)時(shí)鐘，計(jì)數(shù)3000次，實(shí)現(xiàn)3ms高電平
  32   1              COUNT0 = 0xB8;
  33   1              COUNT0 = 0x0B;
  34   1      
  35   1              TR0 = 1;                                                // 啟動(dòng)T0
  36   1      }
  37          
  38          
  39          /* 主程序 */
  40          void main()
  41          { 
  42   1              EA = 1;                                                 // 開CPU中斷
  43   1              ET0 = 1;                                                // 開定時(shí)器0中斷
  44   1              TMOD = 0x01;                                    // 定時(shí)器0方式1
  45   1              TH0 = -(20000/256);                             // 20ms定時(shí)器的計(jì)數(shù)初值
  46   1              TL0 = -(20000%256); 
  47   1      
  48   1              /* 向8254控制字寄存器選擇計(jì)數(shù)器0，并對(duì)其賦初值0 */
  49   1              COMWORD = 0x30;
  50   1              COUNT0 = 0;                                             // 先賦低位字節(jié)
  51   1              COUNT0 = 0;                                             // 再賦高位字節(jié)
  52   1      
  53   1              /* 向8254控制字寄存器選擇計(jì)數(shù)器1，并對(duì)其賦初值0 */
  54   1              COMWORD = 0x70;
  55   1              COUNT0 = 0;                                             // 先賦低位字節(jié)
C51 COMPILER V7.02b   PWM                                                                  12/10/2005 20:24:09 PAGE 2   

  56   1              COUNT0 = 0;                                             // 再賦高位字節(jié)
  57   1      
  58   1              /* 向8254控制字寄存器選擇計(jì)數(shù)器2，并對(duì)其賦初值0 */
  59   1              COMWORD = 0xB0;
  60   1              COUNT0 = 0;                                             // 再賦低位字節(jié)
  61   1              COUNT0 = 0;                                             // 再賦高位字節(jié)
  62   1      
  63   1              TR0 = 1;                                                // 啟動(dòng)定時(shí)器T0
  64   1      
  65   1              while(1){}                                              // 無(wú)限循環(huán)
  66   1              
  67   1      }               
  68          
  69          
  70                  
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  72                  
  73          
  74                  
  75          
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  77          
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  80          
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  82          
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  84          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    121    ----
   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)