测速模块！！！！为什么单调时观察不到PORTB的数值变化呢？程序在下面？

huleishygirl · 发表于 2011-4-6 00:34:18

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

unsigned int Input_Num;

//----------------------时钟初始化------------------------------//
void PLL_Init(void)    //PLLCLK=2*OSCCLK*(SYNR+1)/(REFDV+1)
{                   //锁相环时钟=2*16*(2+1)/(1+1)=48MHz
  REFDV=1;          //总线时钟=48/2=24MHz
  SYNR=2;
  while(!(CRGFLG&0x08));
  CLKSEL=0x80;
}
//--------------------通道0输入捕捉初始化-------------------//
void ECT0_Init(void)
{
  TSCR2=0x06;                //禁止溢出中断,分频系数64（24/64MHz)
  TIOS_IOS0=0;                //通道0为输入捕捉
  TCTL4=0x01;                //捕捉上升沿
  TIE_C0I=1;                   //通道0输入捕捉中断允许
  TSCR1=0x80;                //使能定时器
}

//----------------------主函数-------------------------//
void main(void)
{
  PLL_Init();
  ECT0_Init();
  DDRB=0XFF;
  PORTB=0X00;


  EnableInterrupts;
  //for(;;)
  {
  } /* wait forever */
  /* please make sure that you never leave this function */
}
//--------------------转速计算:-------------------------------//
//
//智能车转速子函数
//
//----------------------------------------------------------------//
#pragma CODE_SEG NON_BANKED //定时器通道0输入捕捉中断
void interrupt 8 Timer0_Onput(void)
{
  TFLG1_C0F=1;//清中断标志位
  Input_Num++;
  PORTB=Input_Num;//Input_Num;

  if(Input_Num>=255)
  {
Input_Num=0;
  }
}