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标题: 新手求指教 128定时器PIT [打印本页]

作者: Star丶新一 时间: 2012-4-27 10:31
标题: 新手求指教 128定时器PIT

//现象

B灯闪动,周期是INTVERAL*(0.01)ms,可用来记时.
//demo by whut_wj

#include <hidef.h>    /* common defines and macros */
#include <MC9S12XS128.h>    /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12xs128"
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt 66 PIT0Interrupt(void)
{
PORTB=~PORTB;
PITTF=0x01;
}
#define  INTVERAL 100
void SetBusClock(void)
{
CLKSEL=0X00;                //disengage PLL to system
PLLCTL_PLLON=1;             //turn on PLL
SYNR=2;
REFDV=1;                      //pllclock=2*osc*(1+SYNR)/(1+REFDV)=48MHz;
_asm(nop);                   //BUS CLOCK=24M
_asm(nop);
while(!(CRGFLG_LOCK==1));    //when pll is steady ,then use it;
CLKSEL_PLLSEL =1;             //engage PLL to system;
}

void PitInit(void)
{
PITMTLD0 = 199; //设定8-bit MICRO Timer0寄存器，它每次从199降到0，花费时间为200*0.125us=25us
PITCFLMT|= 0x83; /*0x83=1(PITE)000 0011(PFLMT[1:0])

ITE:使能PITPFLMT强制加载8位计数器值*/
PITMUX &= 0xfe; /*定时器0对应8位计数器0*/
PITLD0 =15999;//定时周期=（15999+1）*25us=400ms
PITINTE|= 0x01; /*使能定时器0的time-out中断*/
PITFLT |=0x01; //强制加载
PITCE |= 0x01; /*使能定时器0，开始定时*/
}
void main(void)
{
EnableInterrupts;

   SetBusClock();
for(;;)
{
   PitInit();
   DDRB=0xff;
   PIT0Interrupt();
}
}

红色的两行什么意思？？？void interrupt 66 PIT0Interrupt(void)
为什么是66？？？O(∩_∩)O谢谢

作者: WGQHHH 时间: 2013-8-27 14:32
中断向量啊，可以查到的

作者: guozy205 时间: 2013-9-2 15:09
打开 MC9S12XS128.h文件就能看到0-120 中断向量及中断号

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