畢業設計-基于單片機的頻率計數器設計(留存版)

　　

【正文】 具 1 套； 5. 系統設計所需的元器件。 第二周 星期一：設計及上機調試。故輸入時鐘信號的最高頻率不得超過單片機晶振頻率的二十四分之一 ，最大計數值為 fOSC/24，由于 fOSC＝ 12MHz，因此： T1 的最大計數頻率為 。 （ 2） 把 “ 單片機系統 ” 中的 － 74LS138的 A、 B、 C、引腳相連，再把譯碼器經“非門” 與 “ 動態數碼顯示 ” 區域中的 6端口用 6芯排線連接 。 0BH 除以 10，同第一步，存儲商，余數與下一個商組合成一個字節，再除以 10，一次類推得到十進制數的十位 0。存儲第一位商 MOV A,B MOV 30H,22H ANL 30H,0F0H ADD A,30H SWAP A MOV B,0AH DIV AB MOV 25H,A 。存儲十進制數千位 MOV A,24H SWAP A 19 ADD A,25H MOV B,0AH DIV AB MOV 54H,B 。s 21 win. Michel Platini, president of European football39。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個人的時候，自己的想法總是特別地清晰。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。t want to give vent to out your inner voice can be in the high school children of the 24 feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。s antiracism taskforce, is in London for the Football Association39。存儲第三位商 MOV 52H,B 。初始化程序 MOV TH0,3DH MOV TL0,71H MOV 20H,20 MOV TH1,00H 16 MOV TL1,00H MOV 21H,00H MOV 22H,00H MOV 23H,00H SETB IT0 SJMP $ CNINT0:SETB TR0 SETB TR1 RETI T0INT:DJNZ 20H,NEXT1。28H 除以 10，商 4H 余 0H，把商 4H 存儲在 26H 單元，余數 0H 與 0H組合成一個字節 00H。 7 狀態譯碼器（ 74LS138） 圖 3 74LS138譯碼器 74LS138譯碼器輸出的狀態控制數碼管的亮與滅，它有 6個狀態，連接到數碼管的位選，達到點亮數碼管點亮的要求。 基本原理與總體方框圖 基本原理 頻率計數器的主要功能是測量周期信號的頻率。 星期二、確定總體方案，學習與設計相關內容。 星期三、各部分方案設 計。頻率是單位時間（ 1S ）內信號發生周期變化的次數。 數據顯示電路 圖 4 顯示電路圖 數據顯示電路由限流電路和 7段數碼管組成 ,采用器件 LED 顯示器。 00H 除以 10，商 0H 余 0H，把商 0H 存儲在 27H 單元，余數 0H 與 0H組合成一個字節 00H。定時中斷服務程序 CLR TR1 CLR TR0 MOV 22H,TH1 MOV 21H,TL1 AJMP TRANSBD NEXT1:MOV TH0,3CH MOV TL0,0B0H EXIT:RETI T1INT:INC 23H。存儲十進制數百位 MOV A,24H SWAP A ADD A,25H MOV B,0AH DIV AB MOV 24H,A 。s 150th anniversary celebrations and will attend City39。t remember his appearance. 童年時，覺得壓歲錢和新衣服是過年必備，但是隨著年齡的推進，會越來越發現，那些東西根本就可有可無；初中時，以為要有一場暗戀才意味著真正的成長，但三年過去后，自己心平氣和的寫同學錄的時候，突然就發現是不是真正的成長了，好像并沒有那么重要了；然后到了高 中，覺得非要吐露出自己的心聲才能為高中生涯里的懵懂情愫劃上一個句點，但畢業晚會的時候最終還是被梗塞在了咽喉，后來再次站在他曾經揮汗如雨的球場，看著他投過籃球的球框時，突然間發現自己已經想不起他的容顏。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) main chute at an altitude of around 5,000 feet (1,524 meters). 26 In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach spe