#include<reg51.h>
#include<stdio.h>

sfr DPTR = 0x82;
long int time_total, freq;
unsigned char flag=0;

intr() interrupt 0{
	if(TR0){
		TR0 = 0;
		flag = 1;
	}
	else{
		TR0 = 1;
	}
}

init_timer(){
	TMOD |= 0x01;
	TCON |= 0x01;
}

void prnt(char ch){
	TI = 0;
	SBUF = ch;
	while(!TI);
}

main(){
	unsigned int divisor=10000, temp;
	IE |= 0x81;
	SCON |= 0x50;
	TMOD |= 0x20;
	TH1 = 0xfd;
	TL1 = 0xfd;
	TR1 = 1;
	while(1){
		init_timer();
		if(flag){
			DPH = TH0;
			DPL = TL0;
			time_total = DPTR;
			freq = 1000000/time_total;
			while(freq){
				temp = freq/divisor;
				temp += 0x30;
				freq%=divisor;
				divisor/=10;
				prnt(temp);
			}
			TH0 = 0x00;
			TL0 = 0x00;
			flag = 0;
		}

	}
}