基于數(shù)字電路的電子秒表課程設(shè)計(已修改)
2025-06-21 16:49 本頁面
【正文】 電子秒表 摘 要 電子秒表是一種用數(shù)字電路技術(shù)實現(xiàn)時、分、秒計時的裝置，無機械裝置，具有較長的使用壽命，因此得到了廣泛的使用。它從原理上講是一種典型的數(shù)字電路，其中包括了組合邏輯電路和時序電路。本次實驗所做電子式秒表由信號發(fā)生系統(tǒng)和計時系統(tǒng)構(gòu)成 ,并具有清零 ,暫停功能。由于需要比較穩(wěn)定的信號，所以信號發(fā)生系統(tǒng) 555定時器與電阻和電容組成的多諧振蕩器構(gòu)成，信號頻率為 100HZ。計時系統(tǒng)由計數(shù)器、譯碼器、顯示器組成。計數(shù)器由 74 LS160構(gòu)成，由十進制計數(shù)器組成了一百進制和六十進制計數(shù)器，采用異步進位方式。譯碼器由 74LS48構(gòu)成，顯示器由數(shù)碼管構(gòu)成。清零 ,暫停功能由 RS觸發(fā)器構(gòu)成防抖動開關(guān)。具體過程為：由晶體震蕩器產(chǎn)生 100HZ脈沖信號先進入計數(shù)器，然后傳入譯碼器，將4位信號轉(zhuǎn)化為數(shù)碼管可顯示的 7位信號，結(jié)果以“分”、“秒”、“ 10毫秒”依次在數(shù)碼管顯示出來。該秒表最大計時值為 59分 ， “ 10毫秒”為一百進制計數(shù)器組成，“分”和“秒”為六十進制計數(shù)器組成。 關(guān)鍵詞 ： 計時 精度 計數(shù)器 顯示器 Abstract Electronic stopwatch is the realization of a digital circuit technology,.It can realize the hour, minute, second does not have mechanical means and has a longer life, so it has been widely used. The principle is a typical digital circuit, which includes a bination logic circuit and a timing circuit. The experiments can be done by electronic stopwatch constituted by the signal system and timing system, and has cleared pause function. Due to the need of a more stable signal, the signal generating system is constituted by the 555 Timer with the resistors and capacitors, and the signal frequency is 100Hz. Timing system contains the counter, decoder, display. Counter 74 LS160 constituted by the decimal counter the decimal and sexagesimal counter, which uses asynchronous binary. The decoder from 74LS48 constitute display digital tube constitute Cleared, the pause function by the RS flipflop. Its specific process: the 100Hz pulse signal generated by the crystal oscillator and first into the counter, and then the ining decoder, a 4bit signal is converted to 7bit signal of the digital control can be displayed, the result by minute, second, 10 milliseconds turn on the digital display. The stopwatch timing is 59 minutes, seconds, 10 milliseconds is the 150 binary counter, minute and second
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