#include <reg51.h>
sbit PWM=P1^0;
void Init0(void)
{
TMOD = 0x01;
TH0 = 0xfc;
TL0 = 0x17;
EA = 1;
ET0 = 1;
TR0 = 1;
}
void INT0()interrupt 1 using 1
{ EA=0;
PWM=~PWM;
EA=1;
void main(void)
Init0();
while(1);