用3线-8线译码器74HC138和门电路设计一个全加器 用3线-8线译码器74LS138和门电路74LS 20各一片...
\u4f7f\u75283\u7ebf-8\u7ebf\u8bd1\u7801\u566874LS138\u548c\u95e8\u7535\u8def\u8bbe\u8ba1\u4e00\u4e2a\u7ec4\u5408\u903b\u8f91\u7535\u8def,\u5176\u8f93\u51fa\u903b\u8f91\u51fd\u6570\u4e3a\u628a\u6bcf\u4e2a\u5f0f\u5b50\u8868\u793a\u6210\u6700\u5c0f\u9879\u76f8\u52a0\uff0c\u8f93\u5165\u7aef\u5c31\u662f\u8fd9\u4e9b\u6700\u5c0f\u9879\uff0c\u8f93\u51fa\u7aef\u5c31\u662f\u5c06\u8fd9\u4e9b\u6700\u5c0f\u9879\u8fdb\u884c\u4e0e\u975e\u8fd0\u7b97\u3002
\u752874LS138\u548c74LS20\u6309\u56fe13-3\u63a5\u7ebf\uff0c74LS20\u82af\u724714\u811a\u63a5 +5v\uff0c7\u811a\u63a5\u5730\u3002\u5229\u7528\u5f00\u5173\u6539\u53d8\u8f93\u5165Ai\u3001Bi\u3001Ci-1\u7684\u72b6\u6001\uff0c\u501f\u52a9\u6307\u793a\u706f\u6216\u4e07\u7528\u8868\u89c2\u6d4b\u8f93\u51faSi\u3001Ci\u7684\u72b6\u6001\uff0c\u8bb0\u5165\u886813-3\u4e2d\uff0c\u5199\u51fa\u8f93\u51fa\u7aef\u7684\u903b\u8f91\u8868\u8fbe\u5f0f\u3002
\u8bd1\u7801\u5668\u5e38\u7528\u4e8e\u8ba1\u7b97\u673a\u4e2d\u5bf9\u5b58\u50a8\u5668\u5355\u5143\u5730\u5740\u7684\u8bd1\u7801\uff0c\u5373\u5c06\u6bcf\u4e00\u4e2a\u5730\u5740\u4ee3\u7801\u8f6c\u6362\u6210\u4e00\u4e2a\u6709\u6548\u4fe1\u53f7\uff0c\u4ece\u800c\u9009\u4e2d\u5bf9\u5e94\u7684\u5355\u5143\u3002\u53e6\u4e00\u79cd\u662f\u5c06\u4e00\u79cd\u4ee3\u7801\u8f6c\u6362\u6210\u53e6\u4e00\u79cd\u4ee3\u7801\uff0c\u6240\u4ee5\u4e5f\u79f0\u4e3a\u4ee3\u7801\u53d8\u6362\u5668\uff0c\u4ee5\u4e0b\u5148\u4ecb\u7ecd\u4e8c\u8fdb\u5236\u552f\u4e00\u5730\u5740\u8bd1\u7801\u5668\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u6ce8\u610f\u4e8b\u9879\uff1a
1\u3001OUT\u8f93\u51fa\u7684\u4ea4\u6d41\u7535\u538b\u53d6\u51b3\u4e8eIN\u8f93\u5165\u7684\u4ea4\u6d41\u7535\u538b.\u51fa\u5382\u662f\u4e3a220V;O/C\u662f\u5e38\u5f00\u6216\u5e38\u95ed\u7684\u7ee7\u7535\u5668\u8f93\u51fa.\u63a5\u7ebf\u540e,\u5c31\u5e38\u5f00\u53ef\u4ee5\u63a7\u5236\u8f93\u51fa12V\u7535\u538b\u7684\u5f00\u548c\u5173,\u901a\u65ad.\u5730\u5740\u7801\u662f\u4e8c\u8fdb\u5236,\u628a\u7b2cN\u8def\u51cf\u4e00,\u8f6c\u6362\u6210\u4e8c\u8fdb\u5236\u5373\u53ef\u3002
2\u3001\u5c0f\u4e8e(100\u7c73)\u7528RS-232\u76f8\u8fde;100~1000\u7c73\u4ee5\u4e0b\u5219\u8981\u7528RS-422\u65b9\u5f0f\u8fdb\u884c\u63a7\u5236,\u5fc5\u987b\u7528232\u8f6c485\u7684\u8f6c\u63a5\u5668.\u603b\u7ebf\u53ef\u8d1f\u8f7d\u6700\u591a64\u4e2a\u89e3\u7801\u5668.\u4e0e\u8ba1\u7b97\u673a\u76f8\u8fde,COM\u53e3\u8fde\u63a53\u6b63,5\u8d1f\u7684\u53d1\u7801\u7ebf\u3002
3\u3001\u89e3\u7801\u5668\u6545\u969c\uff1a\u662f\u5426\u7535\u6e90\u6ca1\u8fde\u63a5\u597d\uff0c\u82af\u7247\u662f\u5426\u538b\u53cd\u6216\u6ca1\u538b\u7d27\uff0c\u5730\u5740\u7801\u662f\u5426\u62e8\u5bf9\uff0cCOM\u53e3\u662f\u5426\u5c4f\u853d\u3002
4\u3001\u8bd1\u7801\u5668\u662f\u63a7\u5236\u89e3\u7801\u5668\u548c\u667a\u80fd\u7403\u7b49\uff0c\u662f\u8fde\u63a5\u6536\u7801\u7ebf2\u6b63,5\u8d1f\u7684\u3002
5\u3001\u5f53\u4e0e\u4e3b\u673a\u76f8\u8fde\u63a5\u65f6\u7528\u89e3\u7801\u56683.5\u9488\u76f8\u8fde\u63a5\u7684\u53d1\u7801\u7ebf\uff0c\u5f53\u4e0e\u4e00\u4f53\u7403\u76f8\u8fde\u63a5\u65f6\u7528\u8bd1\u7801\u56682.5\u9488\u76f8\u8fde\u63a5\u7684\u6536\u7801\u7ebf\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u8bd1\u7801\u5668
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u7ec4\u5408\u903b\u8f91\u7535\u8def
\u6211\u628a\u56fe\u753b\u597d\u4e86\uff0c\u7528protel\u753b\u7684\u3002\u3002\u3002\u600e\u4e48\u7ed9\u4f60\u554a
全加器逻辑表达式为：
绛旓細1銆佽瘧鐮佸櫒璁捐缁勫悎閫昏緫鐢佃矾锛氬埄鐢3绾-8绾胯瘧鐮佸櫒74HC138鍙互璁捐涓涓杈撳嚭鐨勭粍鍚堥昏緫鐢佃矾銆2銆佸湪鍗曠墖鏈虹郴缁熶腑璇戠爜娉曞鍧锛氬埄鐢74HC138鎴74HC139璇戠爜鍣紝浣滀负瀵瑰瓨鍌ㄨ姱鐗囩殑鐗囬変俊鍙峰垎鍒夐氬悇涓姱鐗囥3銆佽瘧鐮佹樉绀猴細鍦ㄥ崟鐗囨満绯荤粺涓紝鐢ㄦ樉绀鸿瘧鐮佸櫒锛屼篃绉颁綔鏁扮爜绠★紝鐢ㄦ潵鏄剧ず鍗曠墖鏈虹殑閿叆鍊笺佷腑闂翠俊鎭強杩愮畻缁撴灉绛夈
绛旓細74HC123鏄弻鍙啀瑙﹀彂鍗曠ǔ鎬佸璋愭尟鑽″櫒锛74HC138鏄3绾-8绾胯瘧鐮佸櫒銆備袱绉嶈姱鐗囷紝涓嶈兘浜掓崲銆傝鏄敤鏃舵彃閿欎簡锛岃姱鐗囧紩鑴歏cc鍜孏nd鐨勮剼浣嶆槸涓鏍风殑锛岃緭鍏ワ紝杈撳嚭涓嶄竴鏍凤紝涓嶇煡閬撳甫鐨勪粈涔堣礋杞斤紝鐭椂闂村彲鑳芥病浜嬶紝鏃堕棿闀挎湁鍙兘浼氱儳鑺墖銆
绛旓細74hc138鍜74hc148鐨勫尯鍒涓嬶細1銆74HC138鏄3绾-8绾胯瘧鐮佸櫒/澶氳矾閫夋嫨鍣紝鏈3涓緭鍏ョ銆2銆74HC148鏄弻4绾-BCD璇戠爜鍣/澶氳矾閫夋嫨鍣紝鏈2涓緭鍏ョ銆
绛旓細74HC193鈥斺斿悓姝ュ彲閫嗚鏁板櫒 74HC138鈥斺3-8璇戠爜鍣 NC555鈥斺旀椂鍩虹數璺 鍋氭硶锛氬皢NC555璁炬垚鏂规尝鍙戠敓鍣紝浜х敓涓瀹氶鐜囩殑鏂规尝鑴夊啿锛屽仛CP 閫氳繃74HC193鐢熸垚3浣嶅苟琛屾暟鎹紝鐒跺悗杈撳叆74HC138璇戞垚8璺苟琛屾暟鎹紝鏈鍚庨┍鍔8LED銆
绛旓細74HC138鏄3-8璇戠爜鍣锛屾墍浠ユ帶鍒惰繖涓姱鐗鐢3涓狪O鍙ｅ氨鍙互浜嗭紝杩欓噷鍋囪鐢≒0鐨勫墠涓変釜IO鍙ｆ潵鎺у埗3-8璇戠爜鍣ㄥ仛娴佹按鐏俰nclude<reg51.h> define uchar unsigned uchar num=0;uchar cnt=0;void t0isr() interrupt 1 { cnt++;if(cnt>=200){ cnt=0;num++;num%=8;P0=num;} } main(){ TMOD=0x...
绛旓細鑺墖74HC137鍔熻兘鍜74HC138鍔熻兘 鍩烘湰涓鏍枫傛湁鐐瑰樊鍒紝74HC137鍙3绾-8绾閿佸瓨璇戠爜鍣锛屾湁鍦板潃閿佸瓨鍔熻兘锛4鑴氫负楂樼數骞虫椂锛岄攣瀛樹簡鍦板潃銆4鑴氫负浣庣數骞虫椂锛岃緭鍑虹殑鐪熷艰〃鐘舵佸拰74HC138涓鏍枫
绛旓細3绾-8绾胯瘧鐮佸櫒鍒欐洿涓虹閫氬箍澶э紝鑳介┍鍔ㄥ叓涓緭鍑猴紝鐢氳嚦鍙互鎵╁睍鍒版洿澶х殑瑙勬ā锛岄泦鎴愬湪CMOS鍜孴TL鍣ㄤ欢濡74x138/139涓紝涓虹數瀛愯璁℃彁渚涗簡寮哄ぇ鏀寔銆傛兂璞′竴涓嬶紝浜岃嚦鍗佽繘鍒惰瘧鐮佸櫒灏卞儚涓涓崄杩涘埗鐨勭炕璇戣咃紝灏嗗洓浣嶄簩杩涘埗缂栫爜缈昏瘧鎴愮洿瑙傜殑鍗佽繘鍒舵暟瀛楋紝濡8421鐮佷腑鐨0011瀵瑰簲鏁板瓧3锛岄氳繃绮剧‘鐨勪唬鐮佽浆鎹紝浣挎樉绀哄櫒涓...
绛旓細瀹為檯宸ョ▼涓娇鐢ㄧ殑鑺墖鍨嬪彿锛74HC138 鏄竴涓父鐢ㄧ殑3绾-8绾胯瘧鐮佸櫒銆傚璺暟鎹夋嫨鍣 (Multiplexer)锛氬伐浣滃師鐞嗭細澶氳矾鏁版嵁閫夋嫨鍣紙MUX锛夋槸涓绉嶆暟瀛楅昏緫鐢佃矾锛屾牴鎹夋嫨淇″彿鐨勪笉鍚岋紝灏嗗涓緭鍏ヤ俊鍙蜂腑鐨勪竴涓夊畾骞朵紶閫掑埌杈撳嚭绔侻UX 鍙互瀹炵幇骞惰鏁版嵁浼犺緭鍒颁覆琛屾暟鎹殑杞崲锛岄檷浣庢暟鎹嚎鐨勬暟閲忥紝绠鍖栫郴缁熻璁°傚簲鐢...
绛旓細3. 璇戠爜鍣:璇戠爜鍣ㄦ槸涓绉嶅皢浜岃繘鍒朵唬鐮佽浆鎹负澶氫釜杈撳嚭绾夸俊鍙风殑缁勪欢, it鍙互瀵逛簩杩涘埗杈撳叆浠ｇ爜杩涜璇戠爜,浣垮叾鐩稿簲鐨勮緭鍑虹嚎璺骇鐢熸縺娲讳俊鍙枫傝瘧鐮佸櫒鐢ㄤ簬瀵瑰涓俊鍙风嚎杩涜閫夋嫨鍜屾帶鍒躲備緥濡:BCD璇戠爜鍣ㄥ彲浠ユ妸浜岃繘鍒剁爜璇戞垚鍗佽繘鍒剁爜銆4. 澶氳矾鏁版嵁閫夋嫨鍣:澶氳矾鏁版嵁閫夋嫨鍣ㄦ槸涓绉嶆牴鎹湴鍧閫夋嫨杈撳叆绾胯矾鏁版嵁浼犻佸埌杈撳嚭鐨...
绛旓細A1'A0'm0Y1A2'A1'A0m1Y2A2'A1A0'm2...Y7A2A1A0m7鐢ㄤ簩鏋佺涓庨棬闃靛垪缁勬垚鐨3绾匡紞8绾胯瘧鐮佸櫒Y0A2'A1'A0'm0Y1A2'A1'A0m1Y2A2'A1A0'm2...Y7A2A1A0m7闄勫姞鎺у埗绔泦鎴愯瘧鐮佸櫒瀹炰緥锛74HC138浣
