基于单片机的自动报时系统设计-毕业论文外文翻译.doc
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1、Tell the time a system design according to the auto of list slice machineAbstract :Especially appear and live the change of bringing the root for mankind with the large scale integration along with the quick development of electronics technique. From it is list slice the machine is technical of appl
2、ied the product has already walked into thousand 10000. The emergence of the electronics ten thousand calendars brings peoples life of many conveniences. Automatically tell the time the system is used of the single slice of machine chip is AT89 C51 chipses, in addition still include: DS1302 chips, c
3、rystal flap electric circuit and reset the electric circuit composing list slice machines least application system, there is also independent type key electric circuit, the dynamic state shows an electric circuit etc. It not only can carry out various function of number electronics clock, if have to
4、 compare, adjust, in fixed time, alarm clock etc. function, and can also carry out the function that the fixed-point tells the time.Key words :MCU,The single slice of machine makes bell clock, code, segment code, showForeword: Actually and always the clock can provide second, cent, , the day, week,
5、month and year are small can automatically adjust, and have leap year repair function with 31 weathers for a month. This design is still additional the fixed-point tells the time of function, thus and further completed automatically a design of telling the time the system. In brief described the wor
6、k principle of hardware system first in the text, and attached diagram with the design frame of the hardware system, discuss this graduation design connects the function and work process that a peoples technique and each one connect a people mold piece various hardware applying, and concrete describ
7、ed to circumscribe electric circuit to connect of soft, the hardware adjust to try.1. Single slice of machine total design way of thinking(1) Design minimum hardware system of a single slice of machine of ability normal work, the outer circle electric circuit includes to establish a keyboard, the mo
8、nitor of LCD or LED; (2) Carry on a software design, make use of single slice of machine system the clock design the internal clock system of high accuracy first, minimum and accurate time is period 1; (3) Design on second foundation that counts a machine for a 24 hours, clock, and design some in fi
9、xed time function; (4) Design a dozen of bells performance organization, complete an auto to beat bell function.2. The alternative of hardwareAutomatically tell the time system, it needs to be walked accurately, compare, adjust, in fixed time, the fixed-point tell the time etc., therefore what I cho
10、se is one AT89 C51 list slice machine chip, then go together with with the DS12 C887, key electric circuit, crystal flap electric circuit and reset electric circuit and LED dynamic state of display, can carry out. The key connects, is completed by P1.0, P1.1, P1.2 and P1.3, four functions of keys re
11、spectively BE: One is the function key K1; One is a number to adjust the key K2; One is cancel to establish the key K3, use to establish time; One is K4 keyses, use to establish in fixed time time. Seven type figures tubes drive mold piece, buzzer to drive a mold piece and reset a mold piece, keyboa
12、rd mold piece and crystal to flap to concuss an electric circuit mold a piece five parts to constitute. And all pass AT89 C51 to carry out.2.1 seven type figures tubes drive a mold piece Adopt a dynamic state scanning method, through a set of single slice of machine port drive to merge together of L
13、CD give out light a tube of on carrying(total Yin or total sun carry), LCD gives out light another feet of tube to connect to use an I/O and control it bright put out. The method can drive more LCD and control a way more vivid, and economical list the resources of the slice machine.2.2 buzzers drive
14、 a mold piece The adoption presses electricity type buzzer and presses an electricity type buzzer to be mainly flapped by many Xies to concuss a machine and press to give or get an electric shock Feng to blare slice, resistance to match machine and sympathy box, and outer shell.etc. to constitute. M
15、any Xies flap to concuss the machine constitutes tofrom the transistor or the integrated circuit, when after connecting the power(1.5-15 V direct current work electric voltage), many Xies flap to concuss machine to flap and output the audio frequency signal with 1.52.5 khzs, the resistance matches a
16、 machine push to press to give or get an electric shock Feng to blare a slice of phonation. 2.2 Reset a mold pieceList slice machine while switching on or make procedure lose control because of interference in the work, or the procedure in the work is placed in a certain dead circulating status and
17、all needs to be reset in this case. The function of resetting is the beginning that makes CPU CPU and other function partses all resume to an assurance to start status, and restart a work from this status. The 89 S51 list slice machine resets to depend an external electric circuit realization, the s
18、ignal is led a feet importation by RESET(RST), Gao Dian Ping is effective, while flapping to concuss a machine work, as long as keeping RST to lead feet two machine periods of Gao Dian Ping, single slice of machine namely reset. After resetting, the PC procedure counts the contents of machine as 000
19、0 Hs, the contents is constant in RAM inside the slice. Resetting electric circuit to generally have to up wire reply, move a switch to resetting and automatically reset electric circuit is 3 kinds of, this adoption hand moves to reset a way.2.3 Keyboard mold piece Keyboard structure: The keyboard c
20、an is divided into 2 types: independent conjunction type and determinant(matrix type), each press it translate a code method and can is divided into code and dont code two, here use an independent conjunction type dont code a keyboard, the advantage of this kind of keyboard structure is that the ele
21、ctric circuit is simple; The weakness is to be key to count more, take up more I/O line.2.4 The crystal flaps to concuss an electric circuit mold piece The crystal flaps the function quartz crystal of concussing the machine to flap to concuss a machine to also call quartz crystal the Xie flaps a mac
22、hine, it uses to the stable frequency and the choice frequency, being 1 kind can replace the crystal Xie that the LC Xie flaps a back track to flap a component, this is crystal to flap the quartz that the electric circuit chooses crystal flap frequency to 6 Mhzs. The clock period is a single slice o
23、f machine to circumscribe crystal flap of reciprocal, for example 12 Ms of crystal flap, its time the period is a 1/12 us), is the most basic in the calculator, minimum of time unit.3. The design project of software3.1 System workflow 1. The clock shows: LCD from left arrive right show at a time, ce
24、nt, second, adopt to account for 24 hours. 2. The key controls function: Adopt 4 independent keyboards, an among those are function keys; One is a number adjustment key; One is cancel to establish key, use to establish time; One is an ALM key, use to establish in fixed time time. 3. Time shows: Afte
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