電子萬年歷中英文翻譯

1、design of the digital perpetual calendar based onreal-time clock chipabstract:this electronic calendar uses the at89s52 microcontroller as the core for the control. time circuit which is constituted by dallass ds12c887a real-time clock chip achieved a time and date display, it increased functionalit

2、y for the temperature display and the whole point timekeeping. this paper discusses the hardware circuit of the system, principle in detail,and gives the flow chart of the software design and the major source code. keywords:microcontroller; real-time clock; temperature measurement1 introduction e-ca

3、lendar-bedroom at home,schools,stations and more and more extensive use of plaza for peoples lives,study,work great convenience. electronics calendar for the past need to re-adjust after power-off time and date,and time is a big error. designed the system using real-time clock chip (ds12c887a) as a

4、timer parts,the chip comes with an internal crystal oscillator,so that effectively guarantee the accuracy of the time and hang own internal battery power makes the situation will continue to update the time information . this design uses at89s52 as the main controller,in order to improve the practic

5、ality of the circuit add temperature measurement circuit,timekeeping and alarm functions. 2 system hardware design schematic circuit shown in figure 2: real-time clock core片audio signal generator and driver single-chip controllerat89s52ledkey circuittemperature measurement circuitpower circuit syste

6、m architecture diagram2.1 power supply circuit in order to reduce circuit costs,the system power supply circuit by the transformer transformer,three-terminal integrated regulator (l7805 circuit 5v, has a simple,reliable, inexpensive and so on. 2.2 host controller host controller using atmels latest

7、mcu products at89s52. apart from the single-chip microcomputer has a mcs-51 series single-chip all the benefits of things,also has 8kb of internal in-system programmable flash memory,free and low-power brown-out mode, greatly reducing the power circuit . in addition,also has a watchdog circuit,a rel

8、iable job for the circuit provides greater assurance. 2.3 digital tube display circuit show circuit with a high brightness,long life,low cost features such as the led digital tube. throughout the show circuit by the digital control and display led drive circuit and decoding circuit. because of the s

9、ystem to display the contents of more,a total of 16 digital tube, respectively,with eight shows year,month,day,four show time,show that 22 weeks,2 show the temperature. controller in order to save resources,between the controller and displays add a decoding circuit 16 so that would have required the

10、 line of control into the circuit only 4 control lines,a great save system resources. the decoder by the decoder constitute both 3-8. 2.4 real-time clock chip this design uses the united states dallas company ds12c887a, the chip can automatically generate century,year,month,day,hour,minute,second,su

11、ch as time information. century the use of internal registers with the software will be able to resolve the millennium, the problem. the chip has its own internal battery-keng,external brown-out,the internal time information also be able to maintain for 10 years. time for a single day record of 12 h

12、ours and there is a 24-hour mode. time table ways that also has two kinds of binary numbers,and the other with bcd code express. the chip with 128 bytes of internal ram,one of 11 bytes used to store time information,4 bytes of memory chips used to control information,known as the control register,11

13、3-byte general-purpose ram for users to store temporary information. in addition,users can also program the chip to control a variety of square-wave output,and its internal three-way through the software interrupt shielding. 2.5 buttons and temperature measurements and circuit the system in order to

14、 make the circuit more easy,button circuit design only three keys, which are set,+,-, three keys to adjust the calendar and clock. the system in order to improve the practicality of the circuit,an increase of a temperature display. the system temperature measurement circuit using dallass ds1280. the

15、 device because of its low price,easy circuits,measurement precision,etc. 2.6 audio signal generator and driver circuit the circuits function is to receive control circuit to send to the entire point of time and timing signal,according to system settings produce different frequencies of audio signal

16、s,amplification by the drive circuit to drive speakers to voice their opinions in order to realize the whole point timekeeping and alarm functions. 3 system software design procedures of the system by the main program interrupt service function and pose a number of functions. main function and inter

17、rupt the completion of the initialization function. timer interrupt function main timing clock chip to complete scanning and keypad scanning. clock chip main function is to read and write time,read out the calendar information and to amend the specific value of the internal write clock chip. the mai

18、n source code is as follows: 中文譯文：基于實(shí)時(shí)鐘芯片的電子萬年歷的設(shè)計(jì)摘要:電子萬年歷以at89s52單片機(jī)為控制核心，采用dallas公司的ds12c887a實(shí)時(shí)鐘芯片構(gòu)成計(jì)時(shí)電路，實(shí)現(xiàn)了時(shí)間和日期的顯示，還增加了溫度顯示和整點(diǎn)報(bào)時(shí)的功能。文章對(duì)該系統(tǒng)的硬件電路、工作原理做了詳細(xì)介紹，同時(shí)給出了軟件設(shè)計(jì)的流程圖及主要程序源代碼。關(guān)鍵詞:單片機(jī)，實(shí)時(shí)鐘.溫度測(cè)量1引言電子萬年歷在家庭居室、學(xué)校、車站和廣場(chǎng)使用越來越廣泛，給人們的生活、學(xué)習(xí)、工作帶來極大的方便。針對(duì)以往的電子萬年歷斷電后需重新調(diào)整時(shí)間與日期，且計(jì)時(shí)誤差大的現(xiàn)象。本系統(tǒng)設(shè)計(jì)采用實(shí)時(shí)鐘芯片(ds12c8

19、87a)作為計(jì)時(shí)器件，該芯片內(nèi)部自帶晶體振蕩器，這樣就有效的保證了計(jì)時(shí)的精確性，并且內(nèi)部自帶鏗電池使得在斷電情況能繼續(xù)更新時(shí)間信息。本設(shè)計(jì)采用at89s52作為主控制器，為了提高電路的實(shí)用性加入溫度測(cè)量電路、報(bào)時(shí)和鬧鐘功能。2系統(tǒng)硬件的設(shè)計(jì)電路原理圖如圖所示：實(shí)時(shí)時(shí)鐘芯片音頻信號(hào)產(chǎn)生及驅(qū)動(dòng)電路電源電路 單片機(jī)控制器at89s52數(shù)碼顯示管按鍵電路溫度測(cè)量電路 該系統(tǒng)的結(jié)構(gòu)框圖系統(tǒng)的工作原理是:主控制器每隔一段時(shí)間(小于一秒鐘)讀一次時(shí)鐘芯片的內(nèi)部寄存器的值，將讀出的日歷、時(shí)間信息實(shí)時(shí)的顯示在led數(shù)碼顯示器一上。同時(shí)，主控制器不斷的掃描按鍵電路和溫度測(cè)量電路，當(dāng)有鍵按下時(shí)，識(shí)別出按鍵的值并調(diào)整

20、相應(yīng)的時(shí)間或日歷的值再寫入時(shí)鐘芯片內(nèi)部。溫度數(shù)據(jù)由測(cè)量電路(ds1280)獲得的溫度值送入顯示電路顯示。2. 1電源電路為了減少電路成本，本系統(tǒng)電源電路由變壓器變壓、三端集成穩(wěn)壓(l7805電路產(chǎn)生5v，具有簡(jiǎn)單、可靠、價(jià)格低廉等特點(diǎn)。2. 2主控制器主控制器采用atmel公司的最新系列單片機(jī)產(chǎn)品at89s52。該單片機(jī)除了擁有mcs-51系列單片機(jī)的所有優(yōu)點(diǎn)外，內(nèi)部還具有8kb的在系統(tǒng)可編程flash存儲(chǔ)器，低功耗的空閑和掉電模式，極大的降低了電路的功耗。另外，還具有一個(gè)看門狗電路，為電路的可靠工作提供了更大的保證。2. 3數(shù)碼管顯示電路顯示電路采用具有高亮度、使用壽命長(zhǎng)、價(jià)格低廉等特點(diǎn)的led數(shù)碼管。整個(gè)顯示電路由led數(shù)碼管和顯示驅(qū)動(dòng)電路和譯碼電路構(gòu)成。由于本系統(tǒng)中顯示的內(nèi)容較多，共需要16個(gè)數(shù)碼管，分別用八位顯示年、月、日，四位顯示時(shí)間，二二位顯示星期，二位顯示溫度。為了節(jié)省控制器的資源，在控制器和顯示器之間加入一個(gè)譯碼電路使本來需要16根控制線的電路變成只需四根控制線，極大的節(jié)省了系統(tǒng)資源。該譯碼器由兩個(gè)3