Timer 1 basic experiment: Make the LED connected to the PB port flash in a cycle-EEWORLD

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#include

#include
unsigned char n=0;
void port_init(void) //Port initialization function
{
DDRB = 0xFF; //Port B is defined as output
}

void timer1_init(void) //Timer 1 initialization: 0.5 second timing, prescaler 256
{
TCCR1B = 0x00; //stop
TCNT1H = 0xF8; //setup
TCNT1L = 0x5F;
TCCR1A = 0x00;
TCCR1B = 0x04; //start Timer
}

void main(void)
{
port_init(); //initialize output port
CLI(); //disable all interrupts

MCUCR = 0x00;
GICR = 0x00;
TIMSK = 0x05; //timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialised
timer1_init(); //Timer 1 initialization
while(1) //loop
{
;
}
}

#pragma interrupt_handler timer1_ovf_isr:9
void timer1_ovf_isr(void) //定时中断入口
{
TCNT1H = 0xF8;     //reload counter high value
TCNT1L = 0x5F;     //reload counter low value
if(n>=1)
  {
n=0;
PORTB=55;
}
else
  {
PORTB=0xAA;
n=n+1;
}
}

Keywords：Timer Reference address：Timer 1 basic experiment: Make the LED connected to the PB port flash in a cycle

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