LCD1602显示秒表.功能描述:K3为控制按键.第一次按下时,开始计时，第二次按下时,暂停计时.第三次按下时,累计计时，第四次按下时,暂停计时。K4为清零按键:在任何状态下，按一下K4，均可清零.可同时显示：时、分、秒、毫秒（带有两位ms级显示）-LCD1602 display stopwatch. Functional Descr iption: K3 for the control of keys. When the first press, the beginning of time,

Timer累计计时，使用系统当前时间计时，隔夜跨年都准确无误（测试过）-Timer cumulative time, using the current system time time, overnight New Year s Eve are accurate (tested)

保持型定时器。累计计时IN接通的时间，等于set time设定的时间后out输出为1.(Keep the timer. The time that the cumulative timing IN is connected is equal to the out output of 1. after the time set by the set time.)