鎖相頻率合成器中的顯示與鍵盤設(shè)計

電子通信論文編號:TX218   論文字?jǐn)?shù):7265,頁數(shù):20

目錄
摘 要： 1
Abstract： 1
前 言： 2
第一部分： 鍵盤設(shè)計 2
一 方案設(shè)計與論證 3
二 鍵盤的電路設(shè)計與芯片介紹 4
三 測試方法與測試結(jié)果 9
第二部分：顯示部分設(shè)計 11
一 方案設(shè)計與論證 11
二 顯示的設(shè)計介紹 12
三 測試方法與測試結(jié)果 18
討論： 18
參考文獻(xiàn)： 19

摘 要：
 本文闡述了鎖相頻率合成器中的顯示與鍵盤設(shè)計，分析了多種顯示器的應(yīng)用與設(shè)計和多種鍵盤的設(shè)計方案及其優(yōu)缺點。總結(jié)了如何合理的利用所學(xué)的知識來設(shè)計顯示器和鍵盤，并在實際設(shè)計中應(yīng)用在單片機接口上效果良好。
 本文利用74LS48 集成電路把BCD碼譯碼成七段顯示輸出，再利用一塊ULN2003作位驅(qū)動，購成動態(tài)顯示器，在鍵盤設(shè)計上采用了優(yōu)先編碼器，防止競爭產(chǎn)生，使得編碼輸出就直接構(gòu)成鍵盤的代碼，簡化了單片機的程序設(shè)計。防干擾措施的采用使得鍵盤在距離主機很遠(yuǎn)的時候都可以正確無誤地工作。

Abstract：
 This text has explained the display and keyboard in the frequency synthesizer of phase locking are designed, have analyses the application, design and design of many kinds of keyboards of many kinds of displays. What rational making use of knowledge that we study to design the display and keyboard to use in the application of the one-chip computer is analyses synthetically. Utilize 74LS48 integrated circuit become BCD yards of decipher seven show and export finally. And then use a ULN2003 as the location to drive , purchase into a dynamic display , has adopted the encoder of having priority in the keyboard design, having prevented the competition from producing, and the code outputs the code forming the keyboard directly, have simplified the design program of the one-chip computer
 
關(guān)鍵詞
 七段數(shù)碼顯示，優(yōu)先編碼，動態(tài)掃描
Key words
   Seven sections of numbers showing, priority encode, Dynamic scanning