#include <at89x52.h>
char seg_7_table[]={0xc0,0xf9,0xb0,0xa4,0x99,0x92,0x82,0xf8,0x80,0x90};
char scan_line[]={0xfe,0xfd};
char bcd[]={6,6};
int count=66;
int time=20,j;
main()
{
IE=0x8A;
TMOD=0x10;
TH0=(8192-5000)/32;
TL0=(8192-5000)%32;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
TR0=1;
TR1=1;
while(1);
}
void T0_int(void) interrupt 1
{
TH0=(8192-5000)/32;
TL0=(8192-5000)%32;
P1=seg_7_table[bcd[j]];
P2=scan_line[j];
j++;
if(j==2)
{
j=0;
}
}
void T1_int(void) interrupt 3
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
time--;
if(time==0)
{
time=20;
count++;
if(count>99)
{
count=66;
}
bcd[0]=count%10;
bcd[1]=count /10;
}
}
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