（1）基本功能：一个时钟电路，能显示年月日和时分秒；通过功能键完成年月日时分秒的切换与对时功能； （2）附加功能：有秒表功能，能通过键盘进行时间和秒表功能切换。-(1) basic functions: a clock circuit that can display the date and time, minutes and seconds　when the function key to complete the handover date, day, hour and time function　

(2) Additional features: stopwatch function, through the keyboard time and stopwatch function switching.