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笔者利用TMS3450NL数字钟的定闹设置功能,设计制作了一电话计时附加装置。 工作原理:采用TMS3450集成电路的LED数字钟(以下简称“钟”),在同时按下闹显、“分”设置和“时”设置键(即TMS3450的19、 21和22脚伺时接正电源)时,定闹时间即清零(钟工作在12小时格式时显示为“12:00”,工作在24小时格式时显示为“0:00”);若清零后按着闹显键的同时,每秒钟按一下“分”设置,每分钟按一下“时”设置,那么,就成了以秒为单位的计时钟。这就是本电路的基本工作原理。
I use the TMS3450NL digital clock to set the function of trouble, designed and manufactured a telephone timing device. How it works: TMS3450 integrated circuit LED digital clock (hereinafter referred to as the “clock”), at the same time press the alarm display, “minute” setting and “hour” setting button (ie TMS3450 19, 21 and 22 feet servo positive Power supply), the alarm time is cleared (the clock works in the 12-hour format shows “12:00”, work in the 24-hour format shows “0:00”); At the same time, every second click on the “minutes” setting, click on the “hour” setting every minute, then, has become the second clock as a unit. This is the basic working principle of this circuit.