行翻转法.lst

基于c51的484按键扫描源程序 适合初学者

C51 COMPILER V8.05a   行翻转法                                                             08/14/2008 17:06:02 PAGE 1   


C51 COMPILER V8.05a, COMPILATION OF MODULE 行翻转法
OBJECT MODULE PLACED IN 行翻转法.OBJ
COMPILER INVOKED BY: D:\Program Files\Keil\C51\BIN\C51.EXE 行翻转法.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include <reg51.h>
   2          
   3          unsigned trans(unsigned int i)
   4          {
   5   1              unsigned int j;
   6   1              j=0;
   7   1              while(!(i&1))
   8   1              {
   9   2                      j++;
  10   2                      i=i>>1;
  11   2              }
  12   1              return j;
  13   1      }
  14          
  15          void main(void)
  16          {
  17   1              unsigned int x,y,i;
  18   1              P0=0x0f;
  19   1              while(1)
  20   1              {
  21   2                      if(P0!=0x0f)
  22   2                      {
  23   3                              x=~P0;
  24   3                              x=0x0f&x; 
  25   3                              P0=0xf0;
  26   3                              y=~P0;
  27   3                              y=y/16;
  28   3                              y=trans(y);
  29   3                              x=trans(x);
  30   3                              P1=4*y+x;
  31   3                              for(i=0;i<1000;i++);
  32   3                              while(P0!=0xf0);
  33   3                              P0=0x0f;
  34   3                      }
  35   2              }
  36   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    133    ----
   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)