pwm.c

freescale芯片9s12dp256的示例程序

#include <mc9s12c32.h>     /* derivative information */
#include "can.h"
#include "io.h"
#include "pwm.h"
#include "sci.h"
#include "timer.h"

void PWM_Init(void)
{
  PWMCNT0 = 0;
  PWMDTY0 = 0x6B;             // Store initial value to the duty-compare register
  PWMPER0 = 0xFF;             // and to the period register 
  // PWMPRCLK: ??=0,PCKB2=0,PCKB1=0,PCKB0=0,??=0,PCKA2=0,PCKA1=0,PCKA0=0 
  PWMPRCLK = 0x00;            // Set prescaler register 
  // PWMSCLA: BIT7=0,BIT6=1,BIT5=0,BIT4=0,BIT3=1,BIT2=0,BIT1=1,BIT0=1
  PWMSCLA = 0x4B;             // Set scale register 
  PWMCLK_PCLK0 = 1;           // Select clock source 
  PWME_PWME0 = 1;             // Run counter 
}