【正文】 exam ine t he documents and legal pr oof , check t r aff ic violat ions, t r aff ic accidents, t he f ugit ive suspect suspect ed vehicles and t hef t han t o wor k, f ur t her t ight car, dr iving m anagem ent business f orm alit ies r eview pr ocedur es. . . Tr uck dr iver inf orm ation m anagem ent plat f orm. M otor vehicles and t r aff ic police depar tm ents, St at e t r anspor t aut horit y t o f urt her clar if y t he Division of labour , im plem ent at ion r esponsibilt y, st r engt hen our colabor ation and m anagem ent t oget her, r einf or cing t he m anagem ent of dr iver s on which st r ongly synt het ic war f ar e and inf orm ation war f ar e. 3 st rict ly im plem ent ed. Fr om M ay 1 up, a is im plem ent ed plex r oad and bad weat her driving exam , cur r ent ly DM V is ur ged contr act ors par t y in t r easures dr iving school incr eased sim ulat ion Highway, and continuous ur gent det our s, and snow days, and wet sliding r oad, and bur st sit uat ion disposal, subj ect s I I f ield t o dr iving exam pr oject, is expected 摘 要 單片機是把主要 的 計算機功能部件都集成在一塊芯片上的微型計算機。它是一種集 微處理器 和多 種 接口于一體的微控制器，被廣泛應(yīng)用在智能產(chǎn)品和工業(yè)自動化上，而 51 單片機是個單片機中最為典型和最有代表性的一種。 我的設(shè)計就是以 MCS—51 系列中的 8751H 為核心，與鍵盤、顯示器連接，通過調(diào)節(jié)脈沖信號頻率，進而實現(xiàn)對步進電動機轉(zhuǎn)速的控制。 步進電機是一種易于精確控制的電機 ,由于其良好的性能而受到廣泛的應(yīng)用。其控制方法也多種多樣。 8751H為核心的微機控制調(diào)速器很好解決了各種控制技術(shù)問題。整個系統(tǒng)結(jié)構(gòu) 簡單。通 過改變軟件設(shè)計，可靈活地實現(xiàn)各種控制功能。 我選擇的控制方法：對單片機 8751H進行編程 ,實現(xiàn)對四相步進電機的控制 ,以達到精確定位的目的 。 使 8751H單片機并行 口 P1口高四位 ～ 分別與驅(qū)動電路的接口 A、 B、 C、 D 相連 ,并使驅(qū)動電路的 4 個輸出引腳分別與步 進電機的 4 、 3 、 2 、 1四個勵磁線圈的引腳相連。通過對單片機進行編程 ,使數(shù)據(jù)從 P1口 的 高四位輸出經(jīng)驅(qū) 動電路放大后控制步進電機 ,使其按照單片機編寫的程序按步驟的進行正序旋轉(zhuǎn)或逆序旋轉(zhuǎn) 。 設(shè)計時考慮到 CPU在執(zhí)行指令時可能受到干擾的沖擊 ,導(dǎo)致 程序 ‖跑飛 ‖或者進入 ‖死循環(huán) ‖,因此 ,設(shè)計了看門狗電路 ,使用的是 MAXIM公司生產(chǎn)的微處理系統(tǒng)監(jiān)控集成芯片 MAXI813。 本文還詳細 地 給出了相關(guān)的硬件框圖和軟件流程圖，并編制了該匯編語言程序。 關(guān)鍵字： 8751H；步進電動機；單片機控制； evaluat ion of scient if ic developm ent . Nat ur e securit y t ypenat ur e securit y is t o m aint enance people of healt h value f or t ar get , t hr ough st r engt hening securit y based m anagem ent , and r isk m anagem ent , and equipm ent m anagem ent and t echnology supervision, ensur e pr oduct ion in t he people, and r eal, and syst em, and system, elem ent s ecurit y r eliable, and har m ony unif ied, f ul cont r ol var ious against f act or s, achieved t hought no slack, and m anagem ent no em pt y docum ent , and equipm ent no hidden, and syst em no blocked, and unit zer o non st oped. Qualit y and ef ficiencyqualit y benefit is t o adher e t o t he ent er prise sur vi al, pr ofit and developm ent business t r uth, adher e t o t he all act ivit y is econom ic act ivit y, all cost s can be contr oled, m oney should not be wast ed m anagement philosophy, m anagement analysis, t o im pr ove m anagem ent qualit y, im pr ove cost cont r ol capacit y and m ar ket petit iveness. I nnovation of science and t echnol gyscience and t echnol gy innovat ion is t o play t he r ole of science and t echnology as t he pr im ar y pr oductive f or ce, act ive use of new t echnologies, new m at erials, new pr ocesses, new equipm ent, incr ease investm ent in science and t echnol gy, str engt hening scient if ic and t echnol gical t r aining, speeding up t r ansf or ming scient ifc and t echnological achievem ent s, f orming a num ber of pr opr iet ar y t echnology, enhancing cor e pet it iveness. Resour ce savingt her esour ces saving ent er pr ise was t o r educe coal consum ption, wat er consum pt ion, elect r icit y at t he cor e, enhance t he oper at ion of lean m anagem ent t o r ealize low consum pt ion, high ef f iciency, r educe pr oduction cost s. Second is t o st r engt hen t he business, f inancial, m at er ial, inf orm ation and t he opt im ization of or ganizat ion and m anagem ent , saving t he int er nal t r ansaction cost s. Har m onious developm ent of har m onious developm entis t o const r uct a f or eign envir onm ent f or developm ent . XI NG r ef ers t o t he int er nal secur it y f ir m and int er nal m anagement of t he int er nal m anagement m easur es ar e ef f ective, harm onious. For eign cur r ency m eans Enter prise coor dinat ing developm ent of hom eopat hy, well, get along wit h t he neighbor s bet ter. ( B) XX 2021 f ive ent erprises building int r insic saf et y power pany goals ar e: unplanned out age 0 t im es. Class of disor der s 0, 0 is equivalent f or ced out age r at e. No per sonal inj ur y accident, m aterial and equipm ent accidents do not occur , no f ir e, no envir onm ent al polut ion accident . Enterprise integrated to achieve zero cases of violation, zero accidents, zero. Quality goal is: when generating capacity ≥ 7. 5 bilon kilo watt, sales of over 7. 11 bilon kWh, total profits of ≥ 306. 6 milon Yuan, . . BFS++、 PI、 MI S、 SCM I nf orm at ion syst ems inf r ast r uct ur e, f uly int egr at ed inf or mation syst em t o r ealize inf or m ation r esources shar ing。 t o expand t he br eadt h and dept h of t he por t al syst em , inf or m at ion syst em of Ent er prise M anagem ent Assist ant r ole t o play。 t o im pr ove t he day to day oper ation and m aint enance operat ion r ecor d of pr om oting causes and t r ansf er syst em。 t o str engt hen t he t r aining super vision in lar ge and m edium goods vehicle. A is est ablished lar ge vehicles and sm al vehicles classif icat ion m anagem ent of m ot or vehicle t est m ode, incr eased m edium van car, and dangerous goods t r ansport car, and school car t est pr oj ect。 I I is est ablished m ot or vehicle t est r egulat or y plat f orm , achieved m ot or vehicle t est f ul pr ocess video, and dat a r em ot e r egulat ory。 t hr ee is st r ict ly m ot or vehicle ident if icat ion m anagem ent , equipped wit h unif ied of ident if icat ion equipm ent and t ool, using m obile ident if icat ion Term inal, and law enf or cem ent r ecor ds inst r ument,