文件名称:timer
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利用定时器产生一个0~99秒变化的秒表,并且显示在数码管上,每过一秒将这个变化的数写入板上AT24C02内部。当关闭实验板电源,并再次打开实验板电源时,单片机先从AT24C02中将原来写入的数读取出来,接着此数继 续变化并显示在数码管上-Use timer to generate a change of 0 to 99 seconds stopwatch, and displayed on digital tube, every passing second the number of the change will be written on the board AT24C02 inside. When closing the experiment board power, and turn on the power again test board microcontroller AT24C02 will start to write the original number read out, then this number continues to change and displayed on digital
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