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, the second press, the suspension of time. The third time by pressing, the accumulated time, press the fourth time, the suspension of time. K4 for the Clear button: in any state, click the K4, can be cleared. May also display: hours, minutes, seconds, milliseconds (ms with two-level display)