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附录：英文技术资料翻译
英文原文:
Strucｔｕｒe ａnｄ fuｎctiｏｎ of thｅ MCS-51 series
Sｔructure ａｎｄ ｆｕｎcｔｉｏn oｆ thｅ MCS－51 sdｅ dａta ｂus .Ａｍong thｅm, CＰU iｓ ａ cｏre ｏｆ ｔhｅ ｏne-chｉp cｏmputｅｒ， iｔ ｉs ｔhe cｏｎｔｒol of ｔhｅ ｃomｐuｔer ａnｄ ｃｏmmanｄ ceｎtｒe, madｅ up of ｓuch paｒtｓ as aｒｉthmｅｔｉc uｎｉt ａｎｄ conｔrollｅr , ｅtc．. Ｔｈe arithｍetic ｕnit ｃａn caｒrｙ ｏｎ 8 pｅrｓｏnｓ of arithmetｉｃ ｏperatiｏn and unit ＡＬU oｆ lｏgic ｏperatiｏn ｗｈｉle inｃluｄiｎg oｎe， thｅ 1 stｏrinｇ ｄeｖｉce temporarilieｓ of ８, stoｒiｎg ｄevice ２ tempoｒaｒｉly, ８'ｓ accｕｍulatｉoｎ deｖice ＡＣC, rｅgiｓter B aｎｄ ｐｒocｅｄｕre ｓtatｅ regｉsｔｅr PSW, etｃ. Pｅｒsoｎ ｗhｏ accｕmｕｌate ＡＣC ｃoｕnt ｂy 2 iｎｐｕt ｅndｓ ｅnｔerｅd of checkｉnｇ eｔc. ｔｅｍporａｒｉly ａｓ ｏne oｐerａｔｉon oftｅn, coｍｅ ｆrom ｐeｒsｏｎ ｗho sｔorｅ １ opｅｒatioｎ is it is it maｋe oｐｅratｉon to go on tｏ ｃouｎt tｅmpoｒａriｌy , ｏperａtioｎ ｒeｓult ａnd ｌoopｂａｃk ACC wiｔh aｎother onｅ. In ａddｉtiｏn, ACＣ iｓ oftｅｎ regａrｄｅｄ aｓ the trａnsfer statｉon of daｔa ｔranｓｍisｓioｎ on ８０51 ｉnｓiｄｅ . Ｔhｅ ｓaｍe as general micｒｏprocessor, it iｓ the buｓｉest regisｔｅr. Ｈｅlp ｒeｍembeｒinｇ that agｒeeing with A expｒeｓseｓ in tｈｅ oｒdｅｒ. Tｈe coｎｔrolｌer ｉncluｄes the pｒｏｃeｄuｒｅ ｃoｕnｔｅr , the oｒｄer is deposｉtted, ｔhｅ ordeｒ decｉphｅr， the ｏsｃｉｌｌator anｄ ｔiming ｃｉrcｕit, etｃ. The prｏcｅｄｕre ｃounter ｉs maｄｅ up ｏｆ coｕnter of 8 fｏｒ two, amouｎｔs ｔｏ 16. It is a ｂyｔe addreｓs coｕntｅr ｏf tｈe prｏcｅdurｅ ｉn fａct, tｈｅ cｏntｅnｔ is tｈe ｎext IA ｔｈat will carrｉeｄ ｏut ｉn ＰC. Tｈe coｎｔeｎｔ whｉｃｈ cｈanｇeｓ iｔ can chaｎｇｅ the ｄirecｔｉoｎ ｔｈat tｈｅ prｏcedure cａrｒｉes out ． Shaｋe the cｉｒcuit iｎ ８051 one-ｃhip ｃoｍｐuｔｅrs, ｏnｌｙ need ｏuter quaｒtz ｃｒystａｌ anｄ fｒeｑuｅｎcy ｔｏ ｆineｌy tｕne tｈe ｅｌｅctrｉc caｐacity， ｉｔs ｆreｑueｎｃy rangｅ ｉs its 12MHZ oｆ 1．２MＨZ. Thｉｓ pulse ｓiｇｎal, ａｓ 8051 baｓiｃ beats of workinｇ, ｎamｅly the ｍinimｕｍ ｕnｉｔ of tｉｍe. 8051 is ｔhe saｍe ａs otheｒ ｃｏmputers， the work iｎ harmｏｎｙ unｄer the ｃontrｏｌ of tｈe basic beat, jｕst like ａn ｏrcｈｅsｔra accｏrding ｔo ｔhe ｂｅat play that is cｏmｍanｄed.
Ｔheｒe arｅ ＲOＭ （proｃedｕｒｅ ｍemory , can oｎly ｒeａd ) and RAM iｎ ８051 ｓliｃes （daｔa meｍory, cａn is it can ｗrite ） ｔｗo ｔｏ ｒ