51单片机 计时器

这个功能是，按钮1按下从1数到100，过完100再倒计时回去。

按钮2是倒计时，按钮3是暂停，代码附上：：

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula = P2^6;
sbit wela = P2^7;
sbit key1 = P3^4;
sbit key2 = P3^5;
sbit key3 = P3^6;
uchar code table[]={0x3f,0x06,0x5b,0x4f,
										0x66,0x6d,0x7d,0x07,
										0x7f,0x6f};
sbit led1  = P1^1;
uchar num,num1,hh,numm;
void init();
void key();
void time(uint t){
	uint i,j;
	for(i = t;i>0;i--)
		for(j = 110;j>0;j--);
}
void kk(){
	dula = 1;
	P0 = table[num/10];
	dula = 0;
	P0 = 0xff;
	wela = 1;
	P0 = 0xfe;
	wela = 0;
	time(10);
	dula = 1;
	P0 = table[num%10];
	dula = 0;
	P0 = 0xff;
	wela = 1;
	P0 = 0xfd;
	wela = 0;
	time(10);
}
void main(){
	init();
	while(1){
		key();
		kk();
	}
}
void time_one() interrupt 1
{
	TH0 = (65536-45872)/256;
	TL0 = (65536 - 45872)%256;
	num1++;
	if(num1 == 1){
		num1 = 0;
		num++;
		if(num == 99){
			num = 99;
			TR0 = 0;
			TR1 = 1;
		}
	}
}
void init(){
	TMOD = 0x11;
	TH0 = (65536 - 45872)/256;
	TL0 = (65536 - 45872)%256;
	EA = 1;
	ET0 = 1;
	TR0 = 0;
	
	TH1 = (65536 - 45872)/256;
	TL1 = (65536 - 45872)%256;
	ET1 = 1;
	TR1 = 0;
}
void key(){
	if(key1 == 0){
		time(10);
		if(key1 ==0){
			num++;
			while(!key1);
		}
	}
	if(key2 == 0){
		time(10);
		if(key2 == 0){
			while(!key2);
			TR0 = 1;
		}
	}
	if(key3 == 0){
		time(10);
		if(key3 ==0 ){
			while(!key3);
			EA = ~EA;
		}
	}
	
}
void time2() interrupt 3
{
	TH1 = (65536-45872)/256;
	TL1 = (65536 - 45872)%256;
	num1++;
	if(num1 == 1){
		num1 = 0;
		num--;
		if(num ==0){
			num = 0;
			TR1 = 0;
			TR0 = 1;
		}
	}
}