多次插拔，所以不会对芯片造成损坏。DS1302 时钟芯片是美国 DALLAS 公
司推出的具有涓流电流充电功能的低功耗实时时钟芯片，它可以对年、月、
日等进行计时，还有闰年补偿等功能，而且使用寿命长，误差小，数字显
示是采用的 LCD 液晶显示，可以同时显示各种需要的信息。此外，该电子
万年历还具有时间校准等功能。
【关键字】 时钟电路 时钟芯片 DS1302 LCD 液 晶 显 示 单 片 机
AT89S52
Abstract
In the contemporary busy work and the life, the time has the very intimate relations
with our each people, each people receive the time the influence, for better uses our time,
we must have a measure to the time, therefore has produced the clock and watch. Along
with social, the technical development, the humanity knows the time, from the view sun,
the pendulum clock to the present electron clock, studies, the innovation unceasingly. For
during hour of observation's can understand that other with the human close related
information, for instance the temperature, the week, the date and so on, the electronic ten
thousand calendars were born, its collection time, the date, the week and the temperature
in a body, have the read to be convenient, the demonstration is direct-viewing, the
function is diverse, electric circuit succinct and so on many merits, conforms to the
electronic instrumentation measuring appliance's trend of development, has the broad
market prospect. Along with the people living standard's enhancement and rhythm of
life's quickening, is getting higher and higher to the time request, the accurate digital
time's consumer demand is also more and more
This electron ten thousand calendars mainly use at89S52 monolithic integrated circuit
to take the master control core, provides the clock, the LED dynamic scanning display
monitor by the DS1302 clock chip to demonstrate, at89S52 monolithic integrated circuit
has the power loss to be small, internal ROM all uses FlashROM: Can by the 3V ultra low
voltage work, also completely be simultaneously compatible with the MCS-51 series
monolithic integrated circuit, this chip interior memory is 8KB the ROM storage space,
simultaneously has the 89C51 function, and has the online programming to be possible to
clean the technology, when carries on the debugging to the electric circuit, because the
procedure wrong revision or the procedure addition functional need burns into time the
procedure, does not need to carry on to the chip inserts many times pulls out, will
