main.c

飞思卡尔HCS12里的定时和计时的方案,列出例子,以供参考.RTI,这个不额外占资源,以晶振为参与钟,方便,难精确

//10.24ms
//author:whut_wj

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

void RealTimer_Int(void)
{
	CRGINT_RTIE=1;       //Open Interrupt
	RTICTL=0b1011001;     //about 10ms Interrupt    //10*2^14/(16M)
}                       //实际上是10.24ms



void main(void) {
  /* put your own code here */
  
  DisableInterrupts;
  //Start_PLL();
  RealTimer_Int();
  EnableInterrupts;
  DDRB=0xff;
  PORTB=0XAA; 
  for(;;)
    {
     
    } /* wait forever */
  /* please make sure that you never leave this function */
}

#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt 7 RTI(void)
{
	CRGFLG_RTIF=1;  //Clear Flag
  PORTB^=0Xff;
}