mul_div.lst

单片机C源程序souce

C51 COMPILER V7.06   MUL_DIV                                                               11/17/2006 09:08:34 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE MUL_DIV
OBJECT MODULE PLACED IN mul_div.OBJ
COMPILER INVOKED BY: E:\keil\C51\BIN\C51.EXE mul_div.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          /**************************************
   2          File          :  MUL_DIV.C
   3          Project       :  BDTRV20_MCU_V07
   4          Description   :  大数除法运算，a数组中为被除数的16进制，每一个字节中只有大数的4位，从高位排起。返回商
   5          Created       :  2006.11.7
   6          Last updata   :  
   7          Author        :  Sunzehui   [e-mail]
   8          Compile Tool  :  Keil uVision2
   9          Target Device :  SST89V564RD
  10          Circuit Board :  BD7700
  11          ************************************
  12          Modification History
  13          ************************************
  14           Version      : v2.0
  15           Date         : MM/DD/YYYY
  16           Modifier     :
  17           Description  :
  18          
  19           **********************************
  20           -- Copyright (c)
  21          *************************************/
  22          
  23          extern unsigned long mul_div(unsigned char a[16],unsigned long divisor)
  24                  {
  25   1              unsigned long xdata temp;//余数
  26   1              unsigned long xdata quot=0;//商
  27   1              char i,cnt;
  28   1               for(i=7;i>=0;i--)
  29   1                 {
  30   2                      temp=temp<<4;
  31   2                      temp=temp+a[7-i];
  32   2                 }//提取高四个字节
  33   1              for (i=7;i<16;i++)
  34   1                 {                       
  35   2                  cnt=0;
  36   2                  while(temp>=divisor) //还可以继续减
  37   2                      {
  38   3                       cnt++;
  39   3                       temp=temp-divisor;
  40   3                      }
  41   2                 quot=quot<<4;
  42   2                 quot=quot|cnt;//取得商值
  43   2                 temp=temp<<4;
  44   2                 temp=temp+a[i+1];    
  45   2                 }
  46   1         return quot;
  47   1              }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    403    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----       8
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       9
C51 COMPILER V7.06   MUL_DIV                                                               11/17/2006 09:08:34 PAGE 2   

   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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