C51 COMPILER V7.06   DA0                                                                   07/29/2008 09:53:19 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE DA0
OBJECT MODULE PLACED IN DA0.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE DA0.C BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          //  程序產(chǎn)生鋸齒波,DAC輸出更新發(fā)生在寫(xiě)DAC0H時(shí).
   2          #include <c8051f020.h>                    /*SFR定義*/
   3          sfr16 DAC0     = 0xd2;                    /*DAC0數(shù)據(jù)*/
   4          void DAC_Init(void);
   5          void SYSCLK_Init()
   6          {   
   7   1          unsigned int i;
   8   1          OSCXCN=0X67;         //0X67=0110,0111
   9   1              for(i=0;i<256;i++);         //等待>1ms
  10   1              while(!(OSCXCN&0X80));      //等待XTLVLD變?yōu)?
  11   1              OSCICN=0X88;         //時(shí)鐘失效監(jiān)測(cè)器，選擇外部時(shí)鐘源作為系統(tǒng)時(shí)鐘
  12   1      }
  13          void main (void) {
  14   1      unsigned int i;
  15   1         WDTCN = 0xde;           /*關(guān)看門(mén)狗*/
  16   1         WDTCN = 0xad;
  17   1         SYSCLK_Init();
  18   1         DAC0=0x0;
  19   1         DAC_Init();              /*DAC初始化*/
  20   1         while (1) 
  21   1         {                         
  22   2             DAC0L=DAC0L ;            /*設(shè)置待轉(zhuǎn)換的值并啟動(dòng)D/A轉(zhuǎn)換*/
  23   2                 DAC0H=DAC0H ;
  24   2              for(i=0;i<=1;i++);      /*延時(shí)*/
  25   2             DAC0=DAC0+1;           /*DAC輸出值遞增*/
  26   2              }
  27   1      }
  28          void DAC_Init(void) /*初始化I/O口*/
  29          {
  30   1          REF0CN =0x03;/*內(nèi)部偏壓發(fā)生器和電壓基準(zhǔn)緩沖器工作，基準(zhǔn)從VREF引腳輸出*/
  31   1              DAC0CN |=0x80;          /*DAC0允許，DAC輸出更新發(fā)生在寫(xiě)DAC0H時(shí)*/
  32   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     82    ----
   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)