pwm.c

c8051f020模块.rar

#include <c8051f020.h>

#define uint8 unsigned char
#define uint16 unsigned int



void Init_SYSCLK(void)
{ 
  uint8 i;
  OSCXCN = 0X67;//开始外部22.1184M晶振
  for(i = 0;i < 128;i++); //等待外部起振
  while(!(OSCXCN & 0X80));	//查询标志位
  OSCICN = 0X88;//用外部晶振，并使能始终丢
}


void Init_PCA(void)
{
  PCA0MD=0X00;	//09
  
  PCA0L=0X00;
  PCA0H=0X00; 
  PCA0CPM0=0X46;//CB
  //PCA0CPL0=0; 
  //PCA0CPH1=0X80;
  PCA0CPH0=0Xc8;//4.6k
   
 PCA0CPM1=0X46; //4c高速输出模式,46频率输出模式
 //CCAP3L=0XFF;
 PCA0CPH1=0Xb8;	//5k
 PCA0CPM2=0X46; //4c高速输出模式,46频率输出模式
 PCA0CPH2=0Xc0;	//4.8k
 PCA0CPM3=0X46;
 PCA0CPH3=0Xb1;//5.2k
 PCA0CPM4=0X46;
 PCA0CPH4=0Xaa;//5.4K

  PCA0CN=0X40;
  //EIE1=0X08;
}


void Init_PORT(void)
{
   //XBR0=0X20;
   XBR0=0X2c;
   XBR2=0X40;
   P0MDOUT=0XFF;
}

/*
void PCA_ISR(void) interrupt 9
{
  CF=0;
  CCF1=1;


} */


void main(void)
{
  WDTCN = 0xde;
  WDTCN = 0xad;//关闭看门狗

  Init_SYSCLK();
  Init_PORT();
  Init_PCA();
 // EA=1;

  while(1);
				  
}