mcs.51单机片的引脚reset,ale,ea各有什么作用 MCS—51单片机的引脚EA的作用
mcs-51\u5355\u7247\u673a\u7684\u5f15\u811arst\uff0cale\uff0c83ea\u4fe1\u53f7\u5404\u6709\u4f55\u4f5c\u7528\u9664RST\u590d\u4f4d\u5f15\u811a\u6709\u4f5c\u7528\u5916\uff0c\u5176\u4f59\u4e24\u4e2a\u5f15\u811a\u57fa\u672c\u6ca1\u7528\uff0cALE\u662f\u8bbf\u95ee\u5916\u90e8\u6570\u636e\u5b58\u50a8\u5668\u6216\u7a0b\u5e8f\u5b58\u50a8\u5668\u65f6\u9501\u5b58\u5730\u5740\u7684\u4fe1\u53f7\uff0c\u73b0\u5728\u4e0d\u6269\u5c55\u5916\u90e8RAM\u548cROM\uff0c\u4e00\u822c\u4e0d\u7528\uff0cEA\u662f\u51b3\u5b9a\u8bbf\u95ee\u5185\u90e8\u8fd8\u662f\u5916\u90e8ROM\u7684\u63a7\u5236\u5f15\u811a\uff0c\u73b0\u5728\u5168\u90e8\u662f\u5355\u7247\u673a\u5185\u90e8ROM\uff0c\u591a\u6570\u5355\u7247\u673a\u6ca1\u6709\u8fd9\u4e2a\u5f15\u811a
EA\u5f15\u811a\u7684\u4f5c\u7528\uff0c\u76f4\u63a5\u5f71\u54cd\u5230\u5355\u7247\u673a\u7a0b\u5e8f\u5185\u90e8\u8fd8\u662f\u5916\u90e8\u7a0b\u5e8f\u5b58\u50a8\u5668\u6267\u884c\uff0cEA = 0\u4f4e\u7535\u5e73\u52a8\u4f5c\uff0c\u4e5f\u5c31\u662f\u8bf4\u5f53\u6b64\u5f15\u811a\u63a5\u4f4e\u7535\u5e73\u540e\uff0c\u7cfb\u7edf\u4f1a\u53d6\u7528\u5916\u90e8\u7684\u7a0b\u5e8f\u4ee3\u7801\uff08\u5b58\u4e8e\u5916\u90e8EPROM\u4e2d\uff09\u6765\u6267\u884c\u7a0b\u5e8f\uff0c51\u5355\u7247\u673a\uff0cEA\u4e00\u822c\u90fd\u662f\u63a5VCC\u7684\u3002
\u5185\u90e8ROM\u548c\u5916\u90e8ROM\u9009\u62e9\u7aef\uff0c\u9ad8\u7535\u5e73\u65f6\u8bbf\u95ee\u5185\u90e8ROM\uff1b\u4f4e\u7535\u5e73\u65f6\u8bbf\u95ee\u5916\u90e8ROM\u3002EA\u5f15\u811a\u8868\u793a\u5b58\u53d6\u5916\u90e8\u7a0b\u5e8f\u4ee3\u7801\u4e4b\u610f\uff0c\u4f4e\u7535\u5e73\u52a8\u4f5c\uff0c\u5f53\u6b64\u5f15\u811a\u63a5\u4f4e\u7535\u5e73\u540e\uff0c\u7cfb\u7edf\u4f1a\u53d6\u7528\u5916\u90e8\u7684\u7a0b\u5e8f\u4ee3\u7801\uff08\u5b58\u4e8e\u5916\u90e8EPROM\u4e2d\uff09\u6765\u6267\u884c\u7a0b\u5e8f\u3002EA\u5f15\u811a\u5fc5\u987b\u63a5\u4f4e\u7535\u5e73\uff0c\u56e0\u4e3a\u5176\u5185\u90e8\u65e0\u7a0b\u5e8f\u5b58\u50a8\u5668\u7a7a\u95f4\u3002
\u6269\u5c55\u8d44\u6599\uff1a
EA\u4e3a\u9ad8\u7535\u5e73\u65f6\uff0c\u5355\u7247\u673a\u5148\u8bbf\u95ee\u5185\u90e8\u7a0b\u5e8f\u5b58\u50a8du\u5668\uff0c\u5f53\u5bfb\u5740\u8303\u56f4\u8d85\u51fa\u5185\u90e8\u7a0b\u5e8f\u5b58\u50a8\u5668\u7684\u6700\u5927\u5bfb\u5740\u7a7a\u95f4\u65f6\uff0c\u5c31\u81ea\u52a8\u8df3\u5411\u5916\u4e0d\u7a0b\u5e8f\u5b58\u50a8\u5668\u3002
EA\u4e3a\u4f4e\u7535\u5e73\u65f6\uff0c\u5355\u7247\u673a\u7684\u5730\u5740\u6307\u9488\u76f4\u63a5\u8df3\u5411\u5916\u90e8\u5b58\u50a8\u5668\u3002
\u6570\u636e\u5b58\u50a8\u5668(RAM)\uff1a8051\u5185\u90e8\u6709128\u5b57\u8282\u6570\u636e\u5b58\u50a8\u5668\uff08RAM\uff09\u548c21\u4e2a\u4e13\u7528\u5bc4\u5b58\u5668\u5355\u5143\uff0c\u5b83\u4eec\u662f\u7edf\u4e00\u7f16\u5740\u7684\uff0c\u4e13\u7528\u5bc4\u5b58\u5668\u6709\u4e13\u95e8\u7684\u7528\u9014\uff0c\u901a\u5e38\u7528\u4e8e\u5b58\u653e\u63a7\u5236\u6307\u4ee4\u6570\u636e\uff0c\u4e0d\u80fd\u7528\u4f5c\u7528\u6237\u6570\u636e\u7684\u5b58\u653e\uff0c\u7528\u6237\u80fd\u4f7f\u7528\u7684RAM\u53ea\u6709128\u4e2a\u5b57\u8282\uff0c\u53ef\u5b58\u653e\u8bfb\u5199\u7684\u6570\u636e\uff0c\u8fd0\u7b97\u7684\u4e2d\u95f4\u7ed3\u679c\u6216\u7528\u6237\u5b9a\u4e49\u7684\u5b57\u578b\u8868\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-MCS-51\u5355\u7247\u673a
ale：访问外部存储器时，输出脉冲的下降沿用于锁存16位地址的地八位，即使不访问外部存储器，也有周期正脉冲输出，频率为震荡器频率的1/6
ea：为高电平时访问内部程序存储器，为低电平时访问外部程序存储器
绛旓細搴旇鏄浣嶈剼锛屼竴鑸槸涓涓數瀹瑰拰涓涓數闃讳覆鑱旀帴鍦ㄧ數婧愭璐熸瀬涓ょ锛reset鑴氭帴鍦ㄤ腑闂达紝褰撻氱數鏃剁數瀹瑰閫氾紝缁檙eset鑴氫竴涓珮鐢靛钩锛屽浣鍗曠墖鏈锛岀數瀹瑰厖鐢电粨鏉燂紝reset鑴氬彉涓轰綆鐢靛钩锛屽浣嶇粨鏉燂紝鍗曠墖鏈哄紑濮嬭繍琛屻
绛旓細reset褰撴尟鑽″櫒杩愯鏃讹紝鍦ㄦ寮曡剼涓婂嚭鐜颁袱涓満鍣ㄥ懆鏈熺殑楂樼數骞筹紙鐢变綆鍒伴珮璺冲彉锛夛紝灏嗕娇鍗曠墖鏈澶嶄綅 ale锛氳闂閮ㄥ瓨鍌ㄥ櫒鏃讹紝杈撳嚭鑴夊啿鐨勪笅闄嶆部鐢ㄤ簬閿佸瓨16浣嶅湴鍧鐨勫湴鍏綅锛屽嵆浣夸笉璁块棶澶栭儴瀛樺偍鍣紝涔熸湁鍛ㄦ湡姝ｈ剦鍐茶緭鍑猴紝棰戠巼涓洪渿鑽″櫒棰戠巼鐨1/6 ea锛氫负楂樼數骞虫椂璁块棶鍐呴儴绋嬪簭瀛樺偍鍣紝涓轰綆鐢靛钩鏃惰闂閮ㄧ▼搴忓瓨鍌ㄥ櫒 ...
绛旓細reset褰撴尟鑽″櫒杩愯鏃讹紝鍦ㄦ寮曡剼涓婂嚭鐜颁袱涓満鍣ㄥ懆鏈熺殑楂樼數骞筹紙鐢变綆鍒伴珮璺冲彉锛夛紝灏嗕娇鍗曠墖鏈澶嶄綅 ale锛氳闂閮ㄥ瓨鍌ㄥ櫒鏃讹紝杈撳嚭鑴夊啿鐨勪笅闄嶆部鐢ㄤ簬閿佸瓨16浣嶅湴鍧鐨勫湴鍏綅锛屽嵆浣夸笉璁块棶澶栭儴瀛樺偍鍣紝涔熸湁鍛ㄦ湡姝ｈ剦鍐茶緭鍑猴紝棰戠巼涓洪渿鑽″櫒棰戠巼鐨1/6 ea锛氫负楂樼數骞虫椂璁块棶鍐呴儴绋嬪簭瀛樺偍鍣紝涓轰綆鐢靛钩鏃惰闂閮ㄧ▼搴忓瓨鍌ㄥ櫒 ...
绛旓細rst/vpd寮曡剼鏄珮鐢靛钩锛mcs-51鍗曠墖鏈灏嗗浜庡浣嶇姸鎬併俽st/vpd寮曡剼鏄綆鐢靛钩锛宮cs-51鍗曠墖鏈哄皢姝ｅ父杩愯銆
绛旓細闄ST澶嶄綅寮曡剼鏈変綔鐢ㄥ锛屽叾浣欎袱涓紩鑴氬熀鏈病鐢紝ALE鏄闂閮ㄦ暟鎹瓨鍌ㄥ櫒鎴栫▼搴忓瓨鍌ㄥ櫒鏃堕攣瀛樺湴鍧鐨勪俊鍙凤紝鐜板湪涓嶆墿灞曞閮≧AM鍜孯OM锛屼竴鑸笉鐢紝EA鏄喅瀹氳闂唴閮ㄨ繕鏄閮≧OM鐨勬帶鍒跺紩鑴氾紝鐜板湪鍏ㄩ儴鏄崟鐗囨満鍐呴儴ROM锛屽鏁板崟鐗囨満娌℃湁杩欎釜寮曡剼
绛旓細MCS-51 鍗曠墖鏈哄紩鑴鍔熻兘 MCS鍗曠墖鏈閮介噰鐢40寮曡剼鐨勫弻鍒楃洿鎻掑皝瑁呮柟寮忋傚浘2-9涓哄紩鑴氭帓鍒楀浘锛40鏉″紩鑴氳鏄庡涓嬶細1銆佷富鐢垫簮寮曡剼Vss鍜孷cc 鈶 Vss鎺ュ湴 鈶 Vcc姝ｅ父鎿嶄綔鏃朵负+5浼忕數婧 2銆佸鎺ユ櫠鎸紩鑴歑TAL1鍜孹TAL2 鈶 XTAL1鍐呴儴鎸崱鐢佃矾鍙嶇浉鏀惧ぇ鍣ㄧ殑杈撳叆绔紝鏄鎺ユ櫠浣撶殑涓涓紩鑴氥傚綋閲囩敤澶栭儴鎸崱鍣ㄦ椂锛屾寮曡剼...
绛旓細40涓寮曡剼澶ц嚧鍙垎涓4绫伙細鐢垫簮銆佹椂閽熴佹帶鍒跺拰I/O寮曡剼銆傗拡 鐢垫簮:锛1锛 VCC - 鑺墖鐢垫簮锛屾帴+5V锛涳紙2锛塚SS - 鎺ュ湴绔紱鈷 鏃堕挓:XTAL1銆乆TAL2 - 鏅朵綋鎸崱鐢佃矾鍙嶇浉杈撳叆绔拰杈撳嚭绔傗拪 鎺у埗绾:鎺у埗绾垮叡鏈4鏍癸紝锛1锛 ALE/PROG:鍦板潃閿佸瓨鍏佽/鐗囧唴EPROM缂栫▼鑴夊啿 鈶 ALE鍔熻兘锛氱敤鏉ラ攣瀛楶0鍙ｉ佸嚭鐨勪綆8...
绛旓細MCS-5l 绯诲垪鍗曠墖鏈虹殑澶嶄綅寮曡剼RST锛 绗9 绠¤剼锛 鍑虹幇2涓満鍣ㄥ懆鏈熶互涓婄殑楂樼數骞虫椂锛屽崟鐗囨満灏辨墽琛屽浣嶆搷浣溿傚鏋淩ST 鎸佺画涓洪珮鐢靛钩锛屽崟鐗囨満灏卞浜庡惊鐜浣嶇姸鎬併傚浣嶆搷浣滈氬父鏈変袱绉嶅熀鏈舰寮忥細涓婄數鑷姩澶嶄綅鍜屽紑鍏冲浣嶃傚浘2 涓墍绀虹殑澶嶄綅鐢佃矾灏卞寘鎷簡杩欎袱绉嶅浣嶆柟寮忋備笂鐢电灛闂达紝鐢靛涓ょ鐢靛帇涓嶈兘绐佸彉锛屾鏃剁數瀹圭殑...
绛旓細褰MCS-5l绯诲垪鍗曠墖鏈虹殑澶嶄綅寮曡剼RST(鍏ㄧОRESET)鍑虹幇2涓満鍣ㄥ懆鏈熶互涓婄殑楂樼數骞虫椂锛屽崟鐗囨満灏辨墽琛屽浣嶆搷浣溿傚鏋淩ST鎸佺画涓洪珮鐢靛钩锛屽崟鐗囨満灏卞浜庡惊鐜浣嶇姸鎬併傚綋閲囩敤12MHz鏅舵尟鏃讹紝涓涓尟鑽″懆鏈熸槸1/(12M)绉掋傜姸鎬佸懆鏈:姣忎釜鐘舵佸懆鏈熶负鏃堕挓鍛ㄦ湡鐨2鍊嶏紝涓涓姸鎬佸懆鏈熶负锛2/12M绉掋傛満鍣ㄥ懆鏈:涓涓満鍣ㄥ懆鏈熷寘鍚6涓姸鎬...
绛旓細rs0(d3h浣) rs1(d4h浣) r0-r1---r7 0 0 00h 01h---07h 0 1 08h 09h---0fh 1 0 10h 11h---17h 1 1 18h 19h---1fh
