#include
#define uchar unsigned char
uchar cnt,sec,fls;
sbit led=P0^0;
void t0isr() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
cnt++;
fls++;
if(cnt>=20)
{
cnt=0;
sec++;
if(sec>=10)sec=0;
}
if(sec<5)
{
if(fls>=10)
{
fls=0;
led=~led;
}
}
if(sec>=5)
{
if(fls>=3)
{
fls=0;
led=~led;
}
}
}
main()
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
ET=1;
EA=1;
while(1);
}
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