【正文】 具 1 套； 5. 系統(tǒng)設(shè)計(jì)所需的元器件。 第二周 星期一：設(shè)計(jì)及上機(jī)調(diào)試。故輸入時(shí)鐘信號的最高頻率不得超過單片機(jī)晶振頻率的二十四分之一 ，最大計(jì)數(shù)值為 fOSC/24，由于 fOSC＝ 12MHz，因此： T1 的最大計(jì)數(shù)頻率為 。 （ 2） 把 “ 單片機(jī)系統(tǒng) ” 中的 － 74LS138的 A、 B、 C、引腳相連，再把譯碼器經(jīng)“非門” 與 “ 動態(tài)數(shù)碼顯示 ” 區(qū)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(shù)與下一個(gè)商組合成一個(gè)字節(jié)，再除以 10，一次類推得到十進(jìn)制數(shù)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(jìn)制數(shù)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(gè)人的時(shí)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(shù) 0H 與 0H組合成一個(gè)字節(jié) 00H。 7 狀態(tài)譯碼器（ 74LS138） 圖 3 74LS138譯碼器 74LS138譯碼器輸出的狀態(tài)控制數(shù)碼管的亮與滅，它有 6個(gè)狀態(tài)，連接到數(shù)碼管的位選，達(dá)到點(diǎn)亮數(shù)碼管點(diǎn)亮的要求。 基本原理與總體方框圖 基本原理 頻率計(jì)數(shù)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(xué)習(xí)與設(shè)計(jì)相關(guān)內(nèi)容。 星期三、各部分方案設(shè) 計(jì)。頻率是單位時(shí)間（ 1S ）內(nèi)信號發(fā)生周期變化的次數(shù)。 數(shù)據(jù)顯示電路 圖 4 顯示電路圖 數(shù)據(jù)顯示電路由限流電路和 7段數(shù)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(shù) 0H 與 0H組合成一個(gè)字節(jié) 00H。定時(shí)中斷服務(wù)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(jìn)制數(shù)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(shí)，覺得壓歲錢和新衣服是過年必備，但是隨著年齡的推進(jìn)，會越來越發(fā)現(xiàn)，那些東西根本就可有可無；初中時(shí)，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(xué)錄的時(shí)候，突然就發(fā)現(xiàn)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(gè)句點(diǎn)，但畢業(yè)晚會的時(shí)候最終還是被梗塞在了咽喉，后來再次站在他曾經(jīng)揮汗如雨的球場，看著他投過籃球的球框時(shí)，突然間發(fā)現(xiàn)自己已經(jīng)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