小车跷跷板源程序

				C51 COMPILER V7.07   PWM                                                                   07/31/2009 15:39:45 PAGE 1   
				
				
				C51 COMPILER V7.07, COMPILATION OF MODULE PWM
				OBJECT MODULE PLACED IN pwm.OBJ
				COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE pwm.c BROWSE DEBUG OBJECTEXTEND
				
				stmt level    source
				
				   1          #include 
				   2          sbit p1_2=P1^2;
				   3          sbit p1_5=P1^5;
				   4          int setnumber,count;
				   5          void pwm(int number)
				   6          int number;
				   7          {       setnumber=number;                       /*有效脉冲的个数等于设定的值*/
				   8   1              TMOD=0x01;
				   9   1              TH0=0xfc;
				  10   1              TL0=0x18;
				  11   1              EA=1;                   
				  12   1              ET0=1;
				  13   1              TR0=1;                                  /*启动定时器0*/
				  14   1                      }
				  15          time0() interrupt 0 using 1
				  16          {       TR0=0;                                  /*关定时器0*/
				  17   1              if (count < setnumber)                  /*如果计数变量小于给定值则给电机送有效电平*/
				  18   1              {       p1_2=0;
				  19   2                      p1_5=0;
				  20   2              }
				  21   1          else                                        /*否则关电机驱动*/
				  22   1              {       p1_2=1;
				  23   2                      p1_5=1;
				  24   2              }
				  25   1         count++;
				  26   1         if (count>=10)                               /*设定一个周期的脉冲个数为10*/
				  27   1         count=0;
				  28   1         TH0=0xfc;                                    /*重新设定计数初值，开定时器*/
				  29   1         TL0=0x18;
				  30   1         TR0=1;
				  31   1      }
				  32          main()
				  33          { for(;;)
				  34   1        pwm(2);
				  35   1      }
				  36          
				  37          
				
				
				MODULE INFORMATION:   STATIC OVERLAYABLE
				   CODE SIZE        =    103    ----
				   CONSTANT SIZE    =   ----    ----
				   XDATA SIZE       =   ----    ----
				   PDATA SIZE       =   ----    ----
				   DATA SIZE        =      4    ----
				   IDATA SIZE       =   ----    ----
				   BIT SIZE         =   ----    ----
				END OF MODULE INFORMATION.
				
				
				C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)