main.c

mc9s12dg128中几个重要中断的设置和相互嵌套的实现

#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg128.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"
 unsigned char  Itimer10ms;
 unsigned char  Utimer10ms;
 unsigned char counter ;
 /*****************************************************************************
*函数名:  RTIInit()
*入口参数:无
*出口参数:无
*功能:    初始化系统时钟,经PLL倍频后,CPU时钟频率为48MHz,总线时钟频率是24MHz,
*******************************************************************************/
void RTIInit(void)
  {
    REFDV  = 0x01;                      //24M bus clock
    SYNR   = 0x02;                       //48M system clock
    while(!CRGFLG_LOCK);
    CLKSEL = 0x80;
    RTICTL = 0x64;             //RTR[6:4]=110,RTR[3:0]=0100,