1. The task of the subject requires to use AT89C51 to design a 2-digit LED digital display \"stopwatch\", which displays the time from 00 to 99 seconds and automatically adds one per second. That is, the digital display tube quickly adds one to the original count. 2. Design ideas 1. Use a single-chip microcomputer to design a stopwatch that can display every minute and every second; 2. Use three buttons to stop, start, and reset. The \"Start\" button starts timing when the switch is turned from top to bottom. If the \"Start\" button is turned again at this time, the digital tube will pause; the \"Reset\" button will reset the digital tube when the switch is turned from top to bottom. If the \"Start\" button is turned again at this time, the timing can be restarted; 3. Use LCD or digital tube display; 4. Use timer interrupts;
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