文件名称:daojishi_miaobiao
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倒计时秒表设计:使秒表在上电/复位后，具有：开始时显示 9.9 ；并开始倒计时，
当9.9S计时到，数码管显示0.0并闪烁，同时蜂鸣器发声报警3S，倒计时误差小于0.2秒。
晶振频率：11.0592MHz-Countdown stopwatch design: stopwatch after power-on/reset, comprising: a display at the beginning of 9.9 and begins the countdown,
When the timer to 9.9S, 0.0 and digital display flashing and the buzzer sounding alarm 3S, countdown error is less than 0.2 seconds.
Crystal frequency: 11.0592MHz
当9.9S计时到，数码管显示0.0并闪烁，同时蜂鸣器发声报警3S，倒计时误差小于0.2秒。
晶振频率：11.0592MHz-Countdown stopwatch design: stopwatch after power-on/reset, comprising: a display at the beginning of 9.9 and begins the countdown,
When the timer to 9.9S, 0.0 and digital display flashing and the buzzer sounding alarm 3S, countdown error is less than 0.2 seconds.
Crystal frequency: 11.0592MHz
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倒计时秒表.c
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