一份简单点的单片机百年日历计时器（比较简便） -

#include<AT89X52.H>
unsigned char code tab[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C};
unsigned char dat[12];
unsigned char j,k,tmp;
unsigned char year=0;
unsigned char month=12;
unsigned char day=29;
unsigned char hour=23;
unsigned char minute=59;
unsigned char second=45;
unsigned char irq_count=0;
void Delay()
{
unsigned char i;
for(i=0;i<20;i++);
}
void main(void)
{
EA=1;ET0=1;
TMOD=0x01;
TH0=0x3c;
TL0=0xB0;
TR0=1;
while(1)
{
tmp=0x01;
for(j=0;j<8;j++)
{
P0=tab[dat[j]];
P1=~tmp;
tmp=tmp<<1;
Delay();
P1=0xff;
}
tmp=0x01;
for(j=8;j<12;j++)
{
P0=tab[dat[j]]; //年月日
P2=~tmp;
tmp=tmp<<1;
Delay();
P2=0xff;
}
}
}
void timer0(void) interrupt 1 using 1
{
TH0=0x3C;
TL0=0xB0;
irq_count++;
if(irq_count>=20)
{
irq_count=0;
second++;
if(second>=60)
{
second=0;
minute++;
if(minute>=60)
{
minute=0;
hour++;
if(hour>=24)
{
hour=0;
day++;
if(day>=30)
{
day=0;
month++;
if(month>12)
{
month=1;
year++;
if(year>=99)
year=0;
}
}
}
}
}
dat[11]=year%10;
dat[10]=year/10;
dat[9]=month%10;
dat[8]=month/10;
dat[7]=day/10;
dat[6]=day%10;
dat[5]=hour/10;
dat[4]=hour%10;
dat[3]=minute/10;
dat[2]=minute%10;
dat[1]=second/10;
dat[0]=second%10;
}
}

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