#include#define uchar unsigned charuchar pwm,cnt;sbit pluse=P1^0;void t0isr() interrupt 1{cnt++;if(cntelse pluse=0;if(cnt>100)cnt=0;}main(){TMOD=0x02;TH0=156;TL0=156;TR0=1;ET0=1;EA=1;pwm=20;while(1);}
