【正文】 領(lǐng)導(dǎo)給予的大力支持，感謝電工教研室及電路實(shí)驗(yàn)室為我們提供畢業(yè)設(shè)計(jì)的場(chǎng)所和機(jī)器，特別要感謝指導(dǎo)老師王新勇老師給予的幫助！在剛開始做畢業(yè)設(shè)計(jì)時(shí)，我對(duì)自己將要做的題目感到很迷茫，王老師為了使我對(duì)設(shè)計(jì)有一個(gè)感性而清晰的認(rèn)識(shí)，不厭其煩的講解有關(guān)無(wú)線呼叫系統(tǒng)方面的知識(shí)及信息，使我從別人的設(shè)計(jì)中得到啟發(fā)，而且要求我應(yīng)該有自己獨(dú)特的設(shè)計(jì)方向和思路。王老師的指導(dǎo)思想是不去盲目地追求高分，關(guān)鍵是要學(xué)到真東西，為以后工作打下基礎(chǔ)，這也使我受益匪淺。從開始做東西時(shí)不知從何下手，到現(xiàn)在基本上可以獨(dú)立完成簡(jiǎn)單模塊的設(shè)計(jì)，這與王老師的指導(dǎo)是分不開的！在設(shè)計(jì)的過(guò)程中，王老師在軟件和硬件上都積極的指導(dǎo)，每次遇到自己想不明白的問(wèn)題時(shí)，到導(dǎo)師那就迎刃而解，不得不佩服王老師單片機(jī)開發(fā)的水平和動(dòng)手能力，能選到這樣的導(dǎo)師，自己真是很幸運(yùn)，在此向王老師表示最衷心的感謝、并致以崇高的敬意！感謝答辯組的各位老師在炎熱的天氣下為我們所作的各種工作和對(duì)我的論文所做的批評(píng)斧正。另外，衷心感謝本文所引文獻(xiàn)的作者和編者們！ 附　錄一、發(fā)射模塊和接收模塊的PCB1. 發(fā)射模塊的PCB板2. 接收及顯示模塊的PCB板二、外文資料原文Digital Driving and keyboard control chip CH4521. OverviewCH452 digital control display driver and keyboard scan control chip. CH452 builtin clock oscillation circuit, dynamic driving control eight digital or 64 LED, BCD is decoding, scintillation, displacement, Dan addressable, the light beam decoding functions。 It can also carry out 64 key keyboard scanning。 CH452 can cascade through the fourlane or two serial interface Serial Line Interface and SCM to exchange data。 and to be able to provide electricity MCU reset signal. Driver （1）Duiltdriven current level of the current is less than 15 MA .the current word is not less than 80 MA.（2）Dynamic display scanning control, directdrive eight digital control, 64LED light beam or 64. （3）BCD decoding support from the definition of a BCD, a show for special characters.（4）Digital data of the characters left, right side, left circle, right circle. （5）Arbitrary Dan addressable, the independent control of each LED or the digital control of all the bright and destruction. Keyboard Control （1）builtin 64 key keyboard controller, based on the 8 8 matrix keyboard scanner. （2）Embedded keypad input state of the dropdown resistors, built to dither circuit. （3）Keyboard interrupt, we can choose effective lowlevel or lowlevel output pulse output. External Interface （1）Same chip, the optional fourlane highspeed serial interface or economic lines two serial interface. （2）4 Serial Line Interface : Support for multiple cascading chip, the clock speed from 0 to 2 MHz, patible LED chip.（3）2 Serial Line Interface : support two parallel chip CH452 (ADDR pinlevel set their address). 3. Functional Description Driver CH452 of digital control and LEDdriven dynamic scanning, to the order of DIG0 DIG7. When inhaled in which a pin current, the other pins are not current inhalation. CH452 internal drive with current levels, and can directly drive to an inch of a total of Yam Digital, Drivers of the pin SEG6 ~ SEG0 corresponding digital control of the Gparagraph A, Drivers of the pin corresponding digital control SEG7 the decimal point. characterdriven pin DIG7 ~ DIG0 connected to eight digital control of the cathode。 CH452 also can be connected to 8 8 matrix of the two luminous LED array independent or 64 or 64 LED level。 CH452 can change the polarity of characterdriven output to a total of direct drive digital control (decoding), RP or through external drive support of a total digital yang, or external power management support large size of the digital control. CH452 support scanning limit control, and only for the effective distribution of digital scanning time. When scanning the limit set for 1, the only digital control DIG0 all will be the dynamic driving time, thus equivalent to the staticdriven。 When scanning the limit set for 8:00, eight digitalcontrol DIG7 DIG0 each in 1 / 8 of dynamic driving time。 When scanning the limit set for 4:00, 4 LED DIG3 ~ DIG0 each in 1 / 4 of the dynamic driving time, At this time of the LED drive current average than scanning limit for 8:00 double Therefore, lowering the limit could improve scanning digital control display brightness. CH452 support arbitrary Dan addressable, can be used for independent control of 64 LED of an arbitrary or digital control of the specific (such as a decimal), next to the address sequence and keyboard the address line, the address from 00 H to 3FH. When Dan addressable home an order to address some of a position, The address of the corresponding LED or digital control of lights, The operation does not affect any other LED or other digital control of the state. CH452 support 64 Decoding the light beam, with 64 or LED Bargraph said 64 of 65 states, Add new light beam value, the address is less than the value specified light beam LED lights, and greater than or equal to the value specified light beam of light to be extinguished pipe. CH452 default does not work in decoding, At this time eight Chinese characters data Register data708 corresponding digital control of the decimal point and of the GA, For LED arrays, each word of data spaces corresponding to only one of two luminescence. When the data1, corresponding to the data or control of the LED will light up。 When the data0, correspond to the data of the pipe or tube will luminescence quenching. For example, the third data register for the 01, corresponding to the third digital control of the A lit. By setting, CH452 can also work in the BCD decoding modalities that will be used in digital tubedriven, SCM as long as is the binary number BCD, CH452 from its decoding directly driven LED display of characters. BCD decoding of the data refers to the characters register data40for BCD decoding, Control of the drive pin SEG6 ~ SEG0 output, corresponding to the digital control of the Gparagraph A, in addition to the use of the word7 datadriven control of the output pin SEG7 corresponds to the decimal point digital control, character data spaces and six five does not affect BCD decoding. The following table data register of the characters in data40for BCD decoding, The corresponding paragraph A of the Gtube and the digital characters. CH452 provided by the keypad code for the seven, located ~ 20 is listed scan code, located 5 ~3 is code scanning, 6 is a state code (for a key press, the release of key 0). For example, connecting with SEG4 DIG