智能车制作

标题: 求教定时器时间计算 [打印本页]

作者: zzzzzz19881201 时间: 2010-6-11 11:47
标题: 求教定时器时间计算
void SetBusCLK_32M(void)
{
CLKSEL=0X00; //disengage PLL to system
PLLCTL_PLLON=1; //turn on PLL
SYNR=3;
REFDV=1;          //pllclock=2*osc*(1+SYNR)/(1+REFDV)=64MHz;
_asm(nop);       //BUS CLOCK=32M
_asm(nop);
while(!(CRGFLG_LOCK==1));    //when pll is steady ,then use it;
CLKSEL_PLLSEL =1;          //engage PLL to system;
}
void ect_init(void)
{

   PACTL=0x50;
   PACNT=0x0000; // 脉冲累加器清零
   TSCR1 = 0x80; //定时器使能
   //TSCR2 = 0x13; //8分频，允许中断
   TSCR2 = 0x16; //64分频，允许中断
   TIE=0x02;    //TIE=0x01;
   TCNT = 0xffff- 100000;
   TCTL2=0x00;    //定时器与输出引脚断开
   TIOS= 0x0f;
   TC1 = 0xffff; //TC0 = 0xffff;
   TFLG1=0xff;    //TFLG1=0x01;
   asm cli ;
}
定时器时间是多少？？？公式是？？？？？？？

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