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#include "iom168V.h"
#define CLI() asm("cli")
#define SEI() asm("sei")
#define BIT(X) (1<<(X))
#pragma interrupt_handler timer1_ovf_isr:14
void timer1_ovf_isr(void)
{
TCNT1H=0x85;
TCNT1L=0Xed;
~PORTB;
}
void main(void)
{
DDRB=0x40;
PORTB|=0X40;
CLI();
TCCR1B=0X04;//256分频
TCNT1H=0x85;
TCNT1L=0Xed;
//设置定时器初值
SEI();//开启总中断
TIMSK1=0x01;
while(1);
}