C51 COMPILER V7.05   WPCA1PWM16                                                            02/14/2006 10:38:43 PAGE 1   


C51 COMPILER V7.05, COMPILATION OF MODULE WPCA1PWM16
OBJECT MODULE PLACED IN WPCA1pwm16.OBJ
COMPILER INVOKED BY: C:\SiLabs\MCU\IDEfiles\C51\BIN\C51.exe WPCA1pwm16.C DB OE

stmt level    source

   1          //參考程序B:WPCA1pwm16.C 程序實現PCA模塊1的16位PWM輸出，輸出腳CEX1配置在P0.1腳。輸出方波占空比為1/2     
   2           #include <c8051f020.h> /*SFR定義*/
   3          // Function PROTOTYPES
   4          void PORT_Init (void);
   5          void PCA_Init (void);
   6          void PCA_ISR (void);
   7          void main (void) {
   8   1         WDTCN = 0xde;        /*關看門狗*/
   9   1         WDTCN = 0xad;
  10   1         PORT_Init ();                /*初始化IO口*/
  11   1         PCA_Init ();                 /*PCA初始化成16位脈寬調置方式*/
  12   1         EA = 1;                              /*開總中斷*/
  13   1         while (1) {       
  14   2         }
  15   1      }
  16          void PORT_Init (void)
  17          {
  18   1         XBR0 = 0x20; /*CEX0-->P0.0,CEX1-->P0.1,CEX2-->P0.2,CEX3-->P0.3*/
  19   1         XBR2    = 0x40;      /*使能交叉開關和弱上拉*/
  20   1      }
  21          void PCA_Init (void)
  22          {
  23   1      EIE1 = 0x08;    /*允許PCA0申請中斷*/    
  24   1      OSCICN=0x17;    /*采用內部時鐘作系統時鐘,頻率為16MHZ*/
  25   1      PCA0MD = 0x09;  /*PCA方式選擇:使用系統時鐘,允許 CCF1申請中斷*/
  26   1      PCA0L    = 0x00;/*定時/計數器初值為0000H*/
  27   1      PCA0H    = 0x00;
  28   1      PCA0CPM1 = 0xcb;/*PCA模塊1為16位PWM方式，當CCF1=1時，允許CFF1中斷申請*/
  29   1      PCA0CPL1 = 0x00;        /*置比較/捕捉寄存器初值為8000H*/
  30   1      PCA0CPH1 = 0x80;
  31   1      PCA0CN = 0x40;          /*允許PCA定時器/計數器,*/
  32   1      }
  33          /*PCA中斷子程序*/
  34          void PCA_ISR (void) interrupt 9
  35          {
  36   1              CF   = 0;                       /*清溢出中斷標志*/
  37   1              CCF1= 1;                        /*清匹配中斷標志*/
  38   1      }           
  39          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     54    ----
   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)