AVR128的程序——定時(shí)器

#include

#include

#define uchar unsigned char

#define uint unsigned int

void timer1_init(void);

uchar temp=0x01;

void main(void)

{

uchar i,temp;

DDRA = 0XFF;

PORTA = 0XFF;

DDRC = 0XFF;

PORTC = 0XFF;

DDRF |= 0X0E;

PORTF |= 0X0E;

PORTF &= 0xF8;

DDRB |= 0X10;

PORTB |= 0X10;

timer1_init();

SEI();

while(1);

}

void timer1_init(void)

{

TCNT1H = 0xE1;

TCNT1L = 0x7C;

TCCR1A = 0x00;

TCCR1B = 0x05;

TIMSK = 0x04;

}

#pragma interrupt_handler timer1_ovf_isr:15

void timer1_ovf_isr(void)

{

TCNT1H = 0xE1;

TCNT1L = 0x7C;

PORTA=temp;

temp<<=1;

if(temp==0x00)

temp=0x01;

}