#include
#define uchar unsigned char
uchar cnt,led=0xfe;
void t0isr() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
cnt++;
if(cnt>=20)
{
cnt=0;
led=(led<<1)|0x01;
if(led==0xff)led=0xfe;
P0=led;
}
}
main()
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
ET0=1;
EA=1;
P0=led;
while(1);
}
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