我想用Atmega16 定时器1写一个秒表程序；但是数码管一直显示1；求高手指点；

你的程序里有一个miao()函数，可是在主函数中我没看到它，你不调用它当然不计数了

另外定时器计数器1是16位的 建议换成0或者2足矣 另外 最好别用PC端口 PC是烧flash的 用它易出问题

我给你写的，主循环中没用循环语句，因为只显示2位没必要。

//省略宏

uint pp = 0

int time_1s = 0, time_8ms, time

ISR(TIMER2_OVF_vect) //Time2 溢出中断

{

TCNT2 = 0x83

time_8ms = 1

if(time_8ms == 1)

{

timexs_8ms = 0

if(++time >= 125)

{

time_1s = 0

++pp

}

}

}

void Init_T2()

{

TCCR2 = 0x04 //1M晶振 64分频 普通模式 1M/64=15.625K

TCNT2 = 0x83 // (256-130-1)/15.625K= 8ms

TIMSK |= 0x40

}

int main()

{

uchar num,num_1,num_10

DDRA=0xFF

DDRB=0x02

PORTA = 0xff

PORTB = 0xff

Init_T2()

asm("sei")

while(1)

{

num = pp

num_1 = num % 10

num_10 = num / 10

if(num >60)num = 0

else {

PORTA = table[num_1]

PORTB = 0xfe

PORTA = table[num_10]

PORTB = 0xfd

_delay_ms(5)

}

}

//ICC-AVR application builder : 2016-1-4 上午 11:32:30

// Target : M16

// Crystal: 12.000Mhz

#include <iom16v.h>

#include <macros.h>

//利用T2实现2ms定时，而后计时500次就是1S

unsigned int dly_ms,timer_1s

void port_init(void)

{

PORTA = 0x00

DDRA = 0x00

PORTB = 0x00

DDRB = 0x00

PORTC = 0x00//m103 output only

DDRC = 0x00

PORTD = 0x00

DDRD = 0x00

}

//TIMER2 initialize - prescale:128

// WGM: Normal

// desired value: 2mSec

// actual value: 1.995mSec (0.3%)

void timer2_init(void)

{

TCCR2 = 0x00//stop

ASSR = 0x00//set async mode

TCNT2 = 0x45//setup

OCR2 = 0xBB

TCCR2 = 0x05//start

}

#pragma interrupt_handler timer2_ovf_isr:5

void timer2_ovf_isr(void)

{

TCNT2 = 0x45//reload counter value

dly_ms++//2MS定时

if(dly_ms>=500) //定时2ms*500=1000ms=1S

{

dly_ms=0//500次复位后继续冲0-500

timer_1s++//1S往上加吧！！！！

}

}

//call this routine to initialize all peripherals

void init_devices(void)

{

//stop errant interrupts until set up

CLI()//disable all interrupts

port_init()

timer2_init()

MCUCR = 0x00

GICR = 0x00

TIMSK = 0x40//timer interrupt sources

SEI()//re-enable interrupts

//all peripherals are now initialized

}

main()

{

init_devices()//设备初始化

while(1)//作死的循环吧

}

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