单片机定时器1用来产生0-100秒变化的秒表，并且显示在数码管上，每一秒都将此时的数据写入AT24c02中，当系统断电后，下次上电时从AT24c02中读取上次数据，并接着继续显示。注：此例程中AT24c02的A0A1A2引脚都是高电平。-SCM timer is used to generate a change in 0-100 seconds stopwatch, and displayed on the digital control, every second the data is written AT24c02 at this time, when the system is powered down, the next power from AT24c02 in read the last data and then continue to display. Note: This routine AT24c02 of A0A1A2 pins are high.