本资料为AVR系列单片机竞赛设计实例程序22例PROTEUS仿真资料-M16_T0_时钟显示程序及仿真。

#include<iom16v.h>
#define uchar unsigned char

uchar Table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar Data[4]={0,0,0,0};
uchar Time[2]={0,0};
uchar CNT=0;

void DelayMs(uchar i)
{
uchar j;
for(;i>0;i--)
{
for(j=0;j<250;j++);
}
}

void Display(uchar *p)
{
uchar i,sel=0x01;
for(i=0;i<4;i++)
{
PORTC=sel;
PORTA=Table[p[i]];
DelayMs(2);
sel=sel<<1;
}
}

void Process(uchar *p1,uchar *p2)
{
p2[0]=p1[0]/10;
p2[1]=p1[0]%10;
p2[2]=p1[1]/10;
p2[3]=p1[1]%10;
}

void Init_IO(void)
{
DDRA=0xff;
PORTA=0xff;
DDRC=0xff;
PORTC=0xff;
}

void main(void)
{
Init_IO();
DelayMs(10);
TCCR0=0x04;
TCNT0=0x06;
TIMSK=0x01;
SREG=SREG|0x80;
while(1)
{
Process(Time,Data);
Display(Data);
}
}

#pragma interrupt_handler Timer0:10
void Timer0(void)
{
CNT++;
if(CNT==125)
{
CNT=0;
Time[1]++;
if(Time[1]==60)
{
Time[1]=0;
Time[0]++;
}
if(Time[0]==60)
Time[0]=0;
}
}