main.c

PWM高频输出

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

 void Frequency_Init(void) 
{
  int w;
  SYNR=0X02;
  for(w=0;w<400;w++);
  REFDV=0X01;
  for(w=0;w<400;w++);
  CLKSEL=0XC0;
  for(w=0;w<400;w++);
}
      
  
 void main(void) 
 {
  Frequency_Init();
   
   
  PWME=0X00;        //禁止PWM输出   
  PWMCTL=0X10;      //通道不级联
  PWMPRCLK=0X44;    //ClockA=ClockB=Bus/16=1500kHz
  PWMCLK=0XFF;      //时钟来源选择ClockSA、ClockSb 
  PWMSCLA=0X4B;     //PWMSCLA=PWMSCLB=75  
  PWMSCLB=0X4B;
  PWMPOL=0XFF;      //PWM起始输出为高电平  
  PWMCAE=0X00;      //左对齐方式  
  PWMPER01=1000;     //输出周期=PWMPER0/ClockSA=200/10000=20ms  
  PWMDTY01=0XFA;    //脉宽=PWMDTY0/PWMPER0=15/200
  PWME=0X01;        //启动PWM输出
  
 }