Abstract:
We have noticed that the time is continuously updated in PC even though the computer is off. To realize this
task, we have interfaced two chips: microcontroller (89C51) and real time clock (DS 12887). The result of
this is to access the data provided by RTC and displayed it on the 7-segment displays and by using these data
realizing timekeeping. Time keeping means by programming we can set alarm before many year. We can
build a programmer that will keep track of our programs. In addition of this we are provided one function
called day-light-saving, by using this feature we can change our settings in winter and summer accordingly.


摘要：
我們知道，時鐘就算在電腦關(guān)閉狀態(tài)下也是不斷更新的。為了實(shí)現(xiàn)這個功能，我們要接上兩個芯片：單片機(jī)（AT89C51）和實(shí)時時鐘芯片（DS12887）。這樣的結(jié)果是：訪問RTC提供的數(shù)據(jù)并使用它們，使其顯示在7段數(shù)碼管上，從而實(shí)現(xiàn)計(jì)時。這種計(jì)時意味著我們可以通過程序在前幾年就設(shè)置好報警。我們可以有一個程序員，讓其跟蹤我們的程序。此外，我們還提供一種叫做day-light-saving的功能，使用這種功能,我們可以改變設(shè)置,在冬季和夏季進(jìn)行相應(yīng)的調(diào)整。