原创 avr单片机 定时器实验 实验(十一)

这个实验利用avr内部定时器一,通过定时器中断控制led的闪烁.详情见附件

平台:FDRAVR开发板

代码:

#include
 
interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
    PORTB=~PORTB;//输出取反
    TCNT1H=0X80;//重新设定初时值
    TCNT1L=0X00;
}

// Declare your global variables here

void main(void)
{  
    DDRB="0XFF"; //PORTB设置为输出
    PORTB="0XFF";
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 62.500 kHz
// Mode: Normal top="FFFFh"
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: On
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
    TCCR1A=0x00;
    TCCR1B=0x03;//设置时钟分频
    TCNT1H=0x00;
    TCNT1L=0x00;
               

// Timer(s)/Counter(s) Interrupt(s) initialization
    TIMSK="0x04"; //开启定时器1中断

// Global enable interrupts
    #asm("sei")  //开全局中断

while (1)
      {
      // Place your code here

      };
}