內(nèi)容簡介：
課程設(shè)計(jì) 簡易頻率計(jì)的設(shè)計(jì)，共20頁,7944字。
摘 要
隨著電子科學(xué)技術(shù)的迅猛發(fā)展，人們對測量的精度和準(zhǔn)確度的要求也越來越高。電子測量成為許多科技人員必須掌握的一門技術(shù)。測量儀器各種各樣，其中頻率計(jì)是很常用的一種測量儀器。
頻率與許多電參量的測量方案和測量結(jié)果有著一些密切的關(guān)系。因此頻率的測量就顯得更為重要了。測量頻率的方法有許多種,其中電子計(jì)數(shù)器具有使用方便、測量速度快、精度高、以及便于實(shí)現(xiàn)測量過程自動(dòng)化等諸多優(yōu)點(diǎn)，是頻率測量的重要手段之一。
數(shù)字頻率計(jì)是計(jì)算機(jī)、通訊設(shè)備、音頻視頻等科研生產(chǎn)領(lǐng)域不可缺少的測量儀器。它是用十進(jìn)制數(shù)字顯示被測信號頻率的數(shù)字測量儀器。它的基本功能是測量正弦信號，方波信號及其他各種單位時(shí)間內(nèi)變化的物理量。在進(jìn)行模擬、 數(shù)字電路的設(shè)計(jì)、安裝、調(diào)試過程中，由于其使用十進(jìn)制數(shù)顯示，測量迅速，精確度高，顯示直觀，經(jīng)常要用到頻率計(jì)。
本次的課程設(shè)計(jì)是利AT89C51單片機(jī)T0的計(jì)數(shù)功能和T1的定時(shí)功能來完成１S內(nèi)對輸入的信號波形的個(gè)數(shù)進(jìn)行計(jì)數(shù)，計(jì)數(shù)的結(jié)果通過74LS48譯碼器，最后由4位靜態(tài)數(shù)碼管顯示出來，顯示的結(jié)果就是輸入信號的頻率。
關(guān)鍵詞 單片機(jī) 譯碼器 數(shù)碼管 靜態(tài)顯示
Abstrct
With the rapid development of electronic science and technology, people measurement precision and accuracy requirements are getting higher and higher. Electronic Measurement of many scientific and technical personnel must master a technique. Variety of measuring instruments, which is a very commonly used frequency meter as a measuring instrument.
Frequency and number of electrical parameters and measuring the results of the measurement program has a number of closely related. Therefore, the frequency Measurement becomes more important. Measuring frequency There are many ways in which electronic counter with a easy to use, measurement speed, high precision and easy to achieve the measurement of process automation, and many other advantages, is the frequency of Important means of measurement.
Digital frequency meter is the computer, communications equipment, audio, video and other essential areas of scientific research and production measurements Equipment. It is measured using the decimal figures show that the number of signal frequency measuring instruments. Its basic function is to measure sinusoidal signal, square wave signals and a variety of other changes in physical quantities per unit time.Conducting analog, digital circuit design, installation, commissioning process, due to its use decimal number display, measuring the rapid, precise Is indeed high, showing an intuitive, often use the frequency counter.
This course is designed Lee AT89C51 microcontroller T0 and T1 count function of the timing function to complete 1S input signal waveform within the number of counted, count resulted in the adoption 74LS48 decoder, the last by four static digital tube display , which showed the result is the input signal frequency.
Key words： SCM, a static decoder digital tube display
目 錄
摘 要 I
Abstrct II
引 言 1
1設(shè)計(jì)思想及原理 2
1.1設(shè)計(jì)思路 2
2系統(tǒng)硬件電路的設(shè)計(jì) 3
2.1系統(tǒng)控制電路 3
2.1.1關(guān)于AT89C51功能及其引腳說明 3
2.1.2 信號調(diào)理及放大整形模塊 5
2.1.3顯示器的選擇 6
2.2單片機(jī)定時(shí)/計(jì)數(shù)器 6
2.2.1方式寄存器TMOD 6
2.2.2定時(shí)/計(jì)數(shù)器的工作方式 7
3 系統(tǒng)程序的設(shè)計(jì) 8
3.1 頻率計(jì)主程序流程圖 8
3.2 子程序的設(shè)計(jì) 9
3.2.1 中斷服務(wù)子程序 9
3.2.2 軟件計(jì)數(shù)器子程序 10
3.3.3 動(dòng)態(tài)顯示子程序 10
4源程序清單 11
5總結(jié) 13
6致謝 14
7 參考文獻(xiàn) 15
附錄A總體電路圖. 16
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