#include <hidef.h> /* common defines and macros */
#include <mc9s12dg128.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"
unsigned int tim0,timer_num0;
unsigned char impulse_num=0;
byte speedget_sign1=0;

void IC_init(void){
TIOS=0X00; //input capture
TCTL4=0X03; //capture on both edge
TSCR1=0x90; //timer enable
TSCR2=0X07; // Prescale Factor 128
ICPAR_PA0EN=1;
}

#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt MDC_ISR(void){//定时器中断函数
MCFLG = 0x80;
tim0++;
if(tim0==20000){ //transmit the value to PC
tim0=0;
PORTK_BIT0=~PORTK_BIT0;
}
/***********Speed measure*****************/
timer_num0++;
if(timer_num0==2000){
timer_num0=0;
speedget_sign1=1;
}
}
#pragma CODE_SEG DEFAULT

void MDCInit(void) //定时器初始化
{
MCCTL = MCCTL&0Xfb;
MCCTL = 0Xe1; //4分频
MCCTL = MCCTL|0X04;
MCCNT = 80; // (4/16M)*80=10us
MCCTL = MCCTL|0X08 ; //loads the load register into the modulus counter count register
}
void PWM_init(void){
PWMCTL_CON01=1;
PWMCTL_CON23=1; //两个通道联合产生PWM波
PWMCAE_CAE1=0;
PWMCAE_CAE3=0; //0=left,1=center
PWMPOL_PPOL1=1;
PWMPOL_PPOL3=1; //PWM波的极性控制
PWMCLK_PCLK1=1; //选择SA作为时钟源
PWMCLK_PCLK3=1; //选择SB作为时钟源
PWMCNT01=0;
PWMCNT23=0; //计数器清零
PWMPRCLK=0x10; //BUS CLOCK=32M CLOCKA=BUSCLOCK,CLOCKB=BUSCLOCK/4
PWMSCLA=1;
PWMSCLB=4; //对PRCLK进行n*2分频
PWMDTY01=1000;
PWMPER01=2500;
PWMDTY23=2640;
PWMPER23=40000;
PWME_PWME1=1;
PWME_PWME3=1; //PWM通道使能
}
/*****************pll倍频********************/

void ini_PLL(void) {
//REFDV=3;
REFDV=3;
//SYNR=5;//倍频24M
SYNR=7;//倍频32M
//SYNR=3; //16M
while(0==CRGFLG_LOCK);
CLKSEL=0X80;}

void main(void) {
DDRK=0XFF;
PORTK=0X00;
DDRA=0XFF;
DDRB=0XFF;
PORTAB=0X0000; //high 8 bit is porta,low 8 bit is portb
//INITEE=0x21;
ini_PLL();
//IC_init();
MDCInit();
PWM_init();
EnableInterrupts;
for(;;) {
if(speedget_sign1){
//impulse_num=PACN0;
//PACN0=0;
speedget_sign1=0;
PORTK_BIT1=~PORTK_BIT1;
}
} /* wait forever */
/* please make sure that you never leave this function */
}

[此贴子已经被作者于2008-7-7 22:39:01编辑过]

谢谢LZ关注，呵呵

我把现在的程序传上来，您帮忙看看

定时器中断可以正常工作了，但是输入捕捉中断无法正常工作，而且寄存器PACN3中的值也不发生变化，请LZ指点迷津！

无法产生中断，并且数据也不对。是不是不能在定时器中断中开输入捕捉中断？