按下S5键一次，利用定时器功能使数值开始自动每秒加1，再按一次S5键，数值停止自动加1，保持原数

#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
uint e,num,v;
uchar code table[]=
{
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
sbit duan=P2^6;
sbit wei=P2^7;

void delay(int x)
{
uint i,j;
for(i=x;i>0;i--)
for(j=110;j>0;j--);
}
void display(uint e)
{
uint y,z;
y=e%10;
z=e/10;
wei=1;
P0=0xfd;
wei=0;
duan=1;
P0=table[y];
duan=0;