pwm代码

仁者

#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg128.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"

void pwminitial()
{
  PWMPOL=0X01;  //通道0输出波形开始极性为1  output waveform which high first then low when the duty counter is reached
  PWMCAE=0x00;    //左对齐输出模式            output left align waveform
  PWMCLK=0X01;    //PWM时钟源为               SAClock SA is the clock source for PWM channel 0
  PWMPRCLK=0X03;  //时钟A8分频                Clock A is 8MHz/8=1MHz
  PWMSCLA=0X80;   //时钟SA为1MHz/128/2        Clock SA is 1MHz/128/2=4KHz
  
  PWMPER0=255;    //设定输出周期=通道时钟周期*256
  PWMDTY0=0;    //占空比初始为0             Duty is 50%,and PWM waveform's frequent is 16  
  PWME=0X01;   //通道0使能                 enable pwm channel 0
}
void main()
{
  pwminitial();
  DDRB=0XFF;  
  while(1)
{
  int i;
  
  
  for(i=0;i<30000;i++)
{if(PTP_PTP0==0)      //PTP0口作为输出引脚
   PORTB=0X00;
  else
   PORTB=0XFF;
_asm "nop";
_asm "nop";
_asm "nop";
}         
   PWMDTY0++;
}
  EnableInterrupts;
  for(;;) {} /* wait forever */
  /* please make sure that you never leave this function */
}

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