針對目前使用的RS232接口數(shù)字化B超鍵盤存在PC主機啟動時不能設(shè)置BIOS,提出一種PS2鍵盤的設(shè)計方法。基于W78E052D單片機,采用8通道串行A/D轉(zhuǎn)換器設(shè)計了8個TGC電位器信息采集電路,電位器位置信息以鍵盤掃描碼序列形式發(fā)送,正交編碼器信號通過XC9536XL轉(zhuǎn)換為單片機可接收的中斷信號,軟件接收到中斷信息后等效處理成按鍵。結(jié)果表明,在滿足開機可設(shè)置BIOS同時,又可實現(xiàn)超聲特有功能,不需要專門設(shè)計驅(qū)動程序,接口簡單,成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot, this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller,designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter, potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU, software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot, ultrasound specific functionality can be achieved at the same time, it does not require specially designed driver,the interface is simple and low cost.
上傳時間: 2013-10-10
上傳用戶:asdfasdfd
在航電系統(tǒng)維護過程中,為解決定位故障的效率和降低維修成本等問題,提出了基于ICD(Interface Control Document,接口控制文件)的1553B總線的信息監(jiān)控系統(tǒng)模型。該系統(tǒng)運用數(shù)據(jù)采集卡對總線中傳輸?shù)男盘栍袩o失真、偏差等電氣特性進行檢測,并使用1553B通訊卡通過測控軟件LabwinDOWs/CVI編程與ICD數(shù)據(jù)庫的動態(tài)鏈接,實現(xiàn)總線信息的解析和故障的判斷。與傳統(tǒng)的維護過程相比,這種模型能夠從信號的電氣特性以及信息的解析等全方位的去檢測判斷故障的來源,并且能夠廣泛在其他1553B總線系統(tǒng)內(nèi)擴展應(yīng)用。驗證表明該監(jiān)控系統(tǒng)可以對總線信息進行快速有效地監(jiān)測分析,能滿足應(yīng)用需求。 Abstract: In the process of avionics system maintenance, to solve the problems such as improving the efficiency of fast orientation to troubles and reducing maintenance cost, system of 1553B bus information monitor model based on ICD was proposed. The system observed whether the data which transmitted on the bus appear distortion and deviation by using data acquisition card. And using 1553B communication card programming of the measure software LabwinDOWs/CVI and the dynamic linking of ICD database, message analysis and fault estimation could be realized. Compared with traditional maintenance, this model can all-dimensionally detect and analyze the source of faults from both electrical characteristics of the signal and message analysis, and it can be widely applied in the other 1553B system. Experiment shown that this monitor system can effectively detect and analyze the bus message and can meet the application requirements.
標簽: 1553B 總線 信息監(jiān)控
上傳時間: 2013-11-23
上傳用戶:18752787361
第一章:MCS-51系列單片機的存儲結(jié)構(gòu)(4學(xué)時) ① 掌握內(nèi)部數(shù)據(jù)寄存器RAM的結(jié)構(gòu)、用途和特點; ② 程序存儲器ROM的結(jié)構(gòu)特點,編程中應(yīng)注意的問題; ③ 片內(nèi)、外程序存儲器的確定方法。 .. 第二章:MCS-51單片機指令系統(tǒng)及時序(4學(xué)時) ① 111條指令的功能分類; ② 指令的尋址方式; ③ 偽指令及匯編語言源程序的格式; ④ 與指令的相關(guān)時序。 第三章:MCS-51單片機內(nèi)部模塊的功能介紹(8學(xué)時) ① 內(nèi)部并行I/O端口的結(jié)構(gòu)特點、使用中的注意事項; ② 定時/計數(shù)器的2種工作方式、4種計數(shù)模式; ③ 串行接口的4種工作模式的設(shè)定及波特率的計算; ④ 中斷系統(tǒng)的結(jié)構(gòu)、中斷響應(yīng)的過程和編程方法。 .. 第四章:MCS-51單片機系統(tǒng)的擴展及應(yīng)用(8學(xué)時); ① 系統(tǒng)擴展的幾種方法; ② 外部程序、數(shù)據(jù)存儲器的擴展; ③ A/D、D/A轉(zhuǎn)換器與單片機的接口電路及編程方法; ④ 鍵盤掃描/動態(tài)顯示接口電路; ⑤ 單片機的監(jiān)控電路等。
上傳時間: 2013-10-17
上傳用戶:熊少鋒
為了有效地提升鉛酸蓄電池的使用壽命,同時實現(xiàn)對充電過程的監(jiān)控,設(shè)計出一種用單片機控制的36 V鉛酸蓄電池充電電源。本電路采用反激式拓撲,連續(xù)電流工作模式,電源管理IC設(shè)計在電源的副邊,由ELAN公司的EM78P258N單片機模擬,是用可編程器件模擬電源管理IC,實現(xiàn)智能電源低成本化的一次成功嘗試,通過對單片機的軟件設(shè)計實現(xiàn)了充電電源的狀態(tài)顯示、充電時間控制、報警、過溫保護、過壓保護、過流保護等功能。本充電器真正的實現(xiàn)了鉛酸蓄電池的三段式充電過程,其最高輸出功率可達90 W,效率約85%,成本不到20元,具有很高的市場競爭力。 Abstract: In order to extend the life of lead-acid battery efficiently and supervise the charging process meanwhile, a 36V lead-acid battery charge powe supply controlled by microcontroller is designed. The charger is flyback switching power supply and works in CCM mode. A EM78P258N microcontroller made by ELAN microelectronics corporation is used as power management IC which is designed at the secondary circuit. The project is a successful attempt to low-cost intelligent power used microcontroller simulating power management IC. The charger also has the functions of the status reveal, charge time control, alarming, thermal protect, current limit and overvoltage protect by the software design. The circuit actually implements the three-step charge process, whose power is up to 90W and whose efficiency can get 85%. The net cost of this charger is less than 20 RMB, so that the charger is of powerful market competitiveness.
上傳時間: 2013-11-16
上傳用戶:cepsypeng
學(xué)習(xí)單片機離不開實驗,以往單片機的實驗往往依賴于仿真機和單片機學(xué)習(xí)系統(tǒng),價格 昂貴,至使學(xué)習(xí)單片機的門檻很高,很多人不能跨入單片機學(xué)習(xí)的大門。近年來,隨著FLASH 型單片機的廣泛應(yīng)用,采用軟件模擬加寫片驗證成為一種經(jīng)濟實用的實驗方法,尤其是隨著 單片機技術(shù)的發(fā)展,很多單片機都具有了ISP 功能,只要一根下載線即可以編程。STC 單片 機更是將其ISP 功能發(fā)揮極致,只要有RS232 接口,不需任何其他電路即可實現(xiàn)ISP 功能。。 多年前,本網(wǎng)站為單片機愛好者設(shè)計了實驗電路板,并公開了全部的軟、硬件資料,廣 受愛好者歡迎,很多人使用這塊實驗電路板學(xué)習(xí)并由此入門,同時網(wǎng)絡(luò)上也出現(xiàn)了很多同類 功能的實驗電路板,為廣大愛好者學(xué)習(xí)單片機創(chuàng)造了良好的條件。
上傳時間: 2014-11-29
上傳用戶:540750247
為解決當前計算機串行通訊接口只有USB,難以滿足舊型號設(shè)備或某些單片機要求RS232通訊的問題,設(shè)計出兩款RS232/USB電路。采用CH341A與MAX223集成電路芯片構(gòu)建標準9線RS232/USB通用接口轉(zhuǎn)換器,無需編程。采用CH341A與PIC16F877A構(gòu)建單片機與計算機之間的USB通訊電路,軟件遵循RS232通訊協(xié)議,硬件進行電平轉(zhuǎn)換。實際使用表明,這兩款產(chǎn)品與計算機端winDOWs 操作系統(tǒng)下的串口應(yīng)用程序完全兼容,且通訊過程中無握手失敗現(xiàn)象。 Abstract: To solve the problem that current computer serial communication only with USB interface can not satisfy with the old type equipments or MCU to communicate with RS232, two kinds of RS232/USB circuit were designed.CH341A and MAX223 integrated circuit chips were used to create a standard 9-line RS232/USB universal interface convertor without programme. CH341A and PIC16F877A chips were adopted to build the USB communication circuit between computers and MCU. The software follows RS232 communication protocol, and the hardware converts electrical levels. Actual practices indicate that the two manufactures are compatible with serial application program of winDOWs operation system completely,and get avoid of handshake lost.
上傳時間: 2013-11-03
上傳用戶:siying
摘 要: 閥門開度儀以AT89C51單片機為核心, 通過在閥門電機軸上安裝的電位計傳感器獲得閥 門電機軸的轉(zhuǎn)動角位移, 從而得出閥門的開度, 達到自動檢測的目的。詳細介紹了串行控制的10 位A /D轉(zhuǎn)換器TLC1549的特點和功能, 說明了TLC1549與AT89C51單片機在閥門開度儀中的硬件 電路和軟件程序。實踐證明, 該閥門開度儀數(shù)據(jù)采集準確可靠、工作穩(wěn)定。 關(guān)鍵詞: TLC1549; AT89C51單片機; 閥門開度
上傳時間: 2013-10-14
上傳用戶:行者Xin
摘要:本文通過介紹PIc秉列單片機的優(yōu)越性和其所配置的定時器/計數(shù)器TMRo.TlⅥI“、TMR2模塊之間的共性及各自的特性,以 及PIc單片機在電機調(diào)速中的應(yīng)用。 關(guān)鍵詞:單片機定時器/計數(shù)囂TMRo,TMRl,TMR2 電機
上傳時間: 2013-10-14
上傳用戶:dingdingcandy
P0端口由鎖存器、輸入緩沖器、切換開關(guān)、一個與非門、一個與門及場效應(yīng)管驅(qū)動電路構(gòu)成。再看圖的右邊,標號 為P0.X引腳的圖標,也就是說P0.X引腳可以是P0.0到P0.7的任何一位,即在P0口有8個與上圖相同的電路組成。
上傳時間: 2014-01-13
上傳用戶:fandeshun
序號 參數(shù) 數(shù)據(jù) 單位 參數(shù) 說 明 . 輸 入 參 數(shù) 變 量 1 umin V 交流輸入電壓最小值 2 umax V 交流輸入電壓最大值 3 fL Hz 電網(wǎng)頻率 4 f kHz 開關(guān)頻率 5 UO V 直流輸出電壓 6 PO W 輸出功率 7 η % 電源效率 8 Z 0.5 損耗分配系數(shù) 9 UFB V 反饋電壓
標簽: 反激式開關(guān)電源 電子 數(shù)據(jù)表格
上傳時間: 2013-10-14
上傳用戶:小碼農(nóng)lz
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