\n\t![\"\u57fa\u4e8eI2C\u603b\u7ebf\u7684\u591a\u673a\u901a\u4fe1\u8c03\u5ea6\u6307\u6325\u7cfb\u7edf\u8bbe\u8ba1\u65b9\u6848\"](\"http:\/\/www.szryc.com\/uploads\/allimg\/190610\/101Q41V4-0.jpg\")
<\/p>\n
\n\t\u56fe1<\/p>\n
\n\t\u4e3b\u673a\u5185\u90e8\u91c7\u7528\u5206\u6563\u63a7\u5236\u65b9\u5f0f\uff0c\u6574\u4e2a\u4ea4\u6362\u7cfb\u7edf\u88ab\u5206\u5272\u6210\u591a\u4e2a\u7528\u6237\u5b50\u7cfb\u7edf\u53ca1\u4e2a\u901a\u4fe1\u5b50\u7cfb\u7edf\uff0c\u6bcf\u4e2a\u5b50\u7cfb\u7edf\u7531\u4e00\u4e2aCPU<\/u>\u5904\u7406\u5355\u5143\u8d1f\u8d23128\u4e2a\u7528\u6237\u7684\u547c\u53eb\u63a7\u5236\u548c\u7ba1\u7406\uff0c\u591a\u4e2a\u5b50\u7cfb\u7edf\u4e4b\u95f4\u901a\u4fe1I2C\u7ec4\u6210\u4e00\u4e2a\u65e0\u4e3b\u901a\u4fe1\u603b\u7ebf\u8fdb\u884c\u4fe1\u606f\u4ea4\u4e92(\u5982\u547c\u53eb\u5904\u7406\u4fe1\u606f\u3001\u7ef4\u62a4\u4fe1\u606f\u7b49)\uff0c\u6784\u6210\u4e00\u4e2a\u5b8c\u6574\u7684\u4ea4\u6362\u7cfb\u7edf\u3002 \u8c03\u5ea6\u64cd\u4f5c\u53f0\u7531\u64cd\u4f5c\u53f0\u63a7\u5236CPU\u3001\u663e\u793a\u5c4f\u53ca\u591a\u4e2a\u7528\u6237\u952e\u677f\u6784\u6210\uff0c\u652f\u6301128\uff5e1024\u4e2a\u64cd\u4f5c\u6309\u952e\u548c256\uff5e2048\u4e2aLED\u6307\u793a\u706f\uff0c\u6bcf\u4e2a\u64cd\u4f5c\u6309\u952e\u53ef\u7f29\u4f4d\u4e00\u7ec4\u7535\u8bdd\u53f7\u7801\u5bf9\u5e94\u4e3b\u673a\u5185\u7684\u4e00\u4e2a\u7535\u8bdd\u7528\u6237\uff0c\u53cc\u706f\u7ec4\u5408\u6307\u793a\u8be5\u7535\u8bdd\u7528\u6237\u72b6\u6001\uff0c\u5e76\u652f\u6301LCD\u4e2d\u6587\u663e\u793a\u3002\u64cd\u4f5c\u53f0\u5185\u90e8\u4e3b\u63a7CPU\u4e0e\u7528\u6237\u952e\u677f\u63a7\u5236CPU\u4e4b\u95f4\u901a\u8fc7I2CU\u53eb\u7ebf\u7ec4\u6210\u4e3b\u4ece\u901a\u4fe1\u603b\u7ebf\u8fdb\u884c\u4fe1\u606f\u4ea4\u4e92(\u6309\u952e\u4fe1\u606f\u3001LED\u663e\u793a\u4fe1\u606f)\u3002<\/p>\n
\n\t1.2\u4e3b\u673aI2C\u603b\u7ebf\u6784\u6210<\/p>\n
\n\t\u5b50\u7cfb\u7edf\u7684CPU\u5904\u7406\u5355\u5143\u7531Philips-80C652\u5355\u7247\u673a<\/u>\u914d\u5408\u5916\u56f4\u7535\u8def(\u5982EPROM<\/u>\u3001RAM<\/u>\u3001EEPROM\u3001\u8bd1\u7801\u548cI\/O\u9a71\u52a8\u7b49)\u6784\u6210\uff0c80C652\u5177\u6709\u4e00\u4e2a\u652f\u6301\u53cc\u5411\u6570\u636e\u4f20\u9001\u7684I2C\u603b\u7ebf\u4e32\u884c\u63a5\u53e3\uff0cI2C\u603b\u7ebf\u903b\u8f91\u6839\u636e\u8def\u5f84\u81ea\u52a8\u5730\u8fdb\u884c\u6570\u636e\u4f20\u9001\u3002CPU\u5bf9I2CU\u603b\u7ebf\u7684\u8bbf\u95ee\u901a\u8fc7\u4ee5\u4e0b\u56db\u4e2a\u7279\u6b8a\u529f\u80fd\u5bc4\u5b58\u5668\u5b8c\u6210\uff1a S1CON(D8H) SIO1\u63a7\u5236\u5bc4\u5b58\u5668 S1STA(D9H) SIO1\u72b6\u6001\u5bc4\u5b58\u5668 S1DAT(DAH) SIS1\u6570\u636e\u5bc4\u5b58\u5668 S1ADR(DBH) SIO1\u4ece\u5730\u5740\u5bc4\u5b58\u5668 SIO1\u903b\u8f91\u901a\u8fc7P1.6\/SCL\u548cP1.7\/SDA\u4e24\u4e2a\u5f15\u811a\u8fde\u63a5\u5230\u5916\u90e8I2C\u603b\u7ebf\uff0c\u53ef\u5de5\u4f5c\u4e8e\u4ee5\u4e0b\u56db\u79cd\u6a21\u5f0f\uff1a\u4e3b\u53d1\u9001\u6a21\u5f0f\u3001\u4e3b\u63a5\u6536\u6a21\u5f0f\u3001\u4ece\u63a5\u6536\u6a21\u5f0f\u3001\u4ece\u53d1\u9001\u6a21\u5f0f\u3002\u5404\u5b50\u7cfb\u7edf\u95f4\u7684I2C\u63a5\u53e3\u590d\u63a5\u5373\u6784\u6210\u4e86\u4e3b\u673aI2C\u901a\u4fe1\u603b\u7ebf\uff0c\u901a\u7968\u7528\u65e0\u4e3b\u901a\u4fe1\u65b9\u5f0f\uff0c\u6bcf\u4e2aCPU\u65e2\u53ef\u4ee5\u54cd\u5e94\u901a\u7528\u5730\u5740\u7684\u5e7f\u64ad\u547c\u53eb\uff0c\u4e5f\u53ef\u4ee5\u8fdb\u884c\u70b9\u5bf9\u70b9\u7684\u901a\u4fe1\uff0c\u5b8c\u5168\u6ee1\u8db3\u7a0b\u63a7\u4ea4\u6362\u7684\u4fe1\u606f\u4f20\u9001\u8981\u6c42\u4e14\u7ed3\u6784\u7b80\u5355\u3002\u8fde\u63a5\u793a\u610f\u56fe\u5982\u56fe2\u6240\u793a\u3002<\/p>\n
\n\t![\"\u57fa\u4e8eI2C\u603b\u7ebf\u7684\u591a\u673a\u901a\u4fe1\u8c03\u5ea6\u6307\u6325\u7cfb\u7edf\u8bbe\u8ba1\u65b9\u6848\"](\"http:\/\/www.szryc.com\/uploads\/allimg\/190610\/101Q41010-1.jpg\")
<\/p>\n
\n\t\u56fe2<\/p>\n
\n\t1.3 \u8c03\u5ea6\u53f0I2C\u603b\u7ebf\u6784\u6210<\/p>\n
\n\t\u64cd\u4f5c\u53f0\u63a7\u5236CPU\u677f\u7531Philips-80C652\u5355\u7247\u673a\u914d\u5408\u5916\u56f4\u7535\u8def(\u5982EPROM\u3001RAM\u3001EEPROM\u3001\u8bd1\u7801\u548c\u663e\u793a\u9a71\u52a8\u7535\u8def\u7b49)\u6784\u6210\uff0c\u5176P1.6- SCL\u3001P1.7-SDA\u4e3aI2C\u603b\u7ebf\u63a5\u53e3SIO1\u3002\u5355\u7247\u673a\u7684SIO1\u901a\u8fc7MC3486\/3487\u4e0e\u4e3b\u673a\u901a\u8fc7RS422\u63a5\u53e3\u901a\u4fe1\uff0cSIO1\u4e0e\u7528\u6237\u952e\u677f\u7684 P87LPC<\/u>764\u901a\u4fe1\uff0c\u6700\u591a\u53ef\u652f\u630163\u5757\u7528\u6237\u952e\u677f\u7684\u901a\u4fe1\u8fde\u63a5\u3002 \u6bcf\u4e2a\u7528\u6237\u952e\u677f\u5747\u91c7\u7528Philips-P87LPC764\u5355\u7247\u673a\u63a7\u5236\uff0c\u6bcf\u5757\u94fe\u677f\u63d0\u4f9b64\u4e2a\u7528\u6237\u6309\u952e\u53ca128\u4e2a\u7528\u6237\u952e\u706f\u3002P87LPC764\u662f51LPC\u7cfb\u5217 OTP\u5355\u7247\u673a\uff0c\u5176\u6700\u5927\u7279\u70b9\u662f\u6539\u8fdb\u578b80C51\u7cfb\u5217\uff0c\u589e\u52a0\u4e86WDT\u770b\u95e8\u72d7<\/u>\u3001I2C\u603b\u7ebf\u3001\u4e09\u4e2a\u6a21\u62df\u91cf\u6bd4\u8f83\u5668<\/u>\u3001\u4e0a\u7535\u590d\u4f4d\u68c0\u6d4b\uff0c\u4fdd\u8bc1I\/O\u53e3\u9a71\u52a8\u7535\u6d41<\/u>\u8fbe\u5230 20mA\uff0c\u8fd0\u884c\u901f\u5ea6\u4e3a\u6807\u51c680C51\u76842\u500d\uff0c\u800c\u4e14\u6e29\u5ea6\u8303\u56f4\u8fbe\u5230\u4e86\u5de5\u4e1a\u7ea7\u6807\u51c6(-40\u2103\uff5e+85\u2103)\u3002\u8be5\u82af\u7247\u7684I2C\u603b\u7ebf\u7cfb\u7edf\u5305\u62ec\u4e00\u4e2a\u53ef\u7b80\u5316\u8f6f\u4ef6\u9a71\u52a8\u7684 I2C\u603b\u7ebf\u786c\u4ef6\u3002\u9664\u4e86\u5fc5\u8981\u603b\u7ebf\u4ef2\u88c1\u3001\u9519\u8bef\u68c0\u6d4b\u3001\u65f6\u949f<\/u>\u6269\u5c55\u548c\u603b\u7ebf\u8d85\u65f6\u5b9a\u65f6\u5668<\/u>\u5916\uff0c\u5305\u62ec\u4e00\u4e2a\u4e00\u4f4d\u63a5\u53e3\uff0c\u8fd9\u4e2a\u63a5\u53e3\u901a\u8fc7\u5faa\u73af\u67e5\u8be2\u6216\u4e2d\u65ad\u540c\u6b65\u8f6f\u4ef6\u3002 \u91c7\u7528\u8be5\u8bbe\u8ba1\u7684\u4f18\u70b9\u5728\u4e8e\u7cfb\u7edf\u6269\u5145\u6027\u5f3a\uff0c\u8f6f\u4ef6\u529f\u80fd\u5206\u62c5\uff1a\u7531P87LPC764\u8fdb\u884c\u6309\u952e\u626b\u63cf\u548cLED\u663e\u793a\u5904\u7406\uff0c\u5927\u5927\u51cf\u8f7b\u4e86\u4e3bCPU-80C652\u7684\u8d1f\u62c5;\u7531\u4e8e P87LPC764\u6027\u4ef7\u6bd4\u4f18\u8d8a\uff0c\u6bd4\u4e13\u7528\u952e\u76d8\u7535\u8def\u66f4\u4fbf\u5b9c\uff0c\u529f\u80fd\u4e0a\u4e5f\u53ef\u7075\u6d3b\u6539\u53d8;\u952e\u677f\u53ef\u6309\u9700\u914d\u7f6e\uff0c\u53ea\u9700\u7b80\u5355\u76844\u7ebf\u8fde\u63a5(SDA\u3001SCL\u3001+5V\u3001GND)\u3002\u8c03\u5ea6\u53f0I2C\u603b\u7ebf\u8fde\u63a5\u793a\u610f\u56fe\u5982\u56fe3\u6240\u793a\u3002<\/p>\n
\n\t![\"\u57fa\u4e8eI2C\u603b\u7ebf\u7684\u591a\u673a\u901a\u4fe1\u8c03\u5ea6\u6307\u6325\u7cfb\u7edf\u8bbe\u8ba1\u65b9\u6848\"](\"http:\/\/www.szryc.com\/uploads\/allimg\/190610\/101Q4HT-2.jpg\")
<\/p>\n
\n\t\u56fe3<\/p>\n
\n\t2.1 I2C\u603b\u7ebf\u7684\u6570\u636e\u4f20\u9001\u65b9\u5f0f<\/p>\n
\n\tI2C\u603b\u7ebf\u5668\u4ef6\u4e4b\u95f4\u901a\u4fe1\u4e32\u884c\u6570\u636e\u7ebfSDA\u548c\u4e32\u884c\u65f6\u949f\u7ebfSCL\u4f20\u9001\u6570\u636e\uff0c\u4ea4\u6362\u4fe1\u606f\u3002\u6bcf\u4e2a\u5668\u4ef6(\u5fae\u63a7\u5236\u5668\u3001LCD\u9a71\u52a8\u5668\u3001\u5b58\u50a8\u5668\u6216\u952e\u76d8\u63a5\u53e3)\u90fd\u8981\u8bbe\u7f6e\u4e00\u4e2a\u72ec\u7279\u7684\u5730\u5740\u7801\u4ee5\u793a\u9a71\u522b\u3002\u6839\u636e\u901a\u8baf\u8981\u6c42\uff0c\u5668\u4ef6\u53ef\u4ee5\u5de5\u4f5c\u4e8e\u53d1\u9001\u6216\u63a5\u6536\u65b9\u5f0f\uff0c\u5e76\u5141\u8bb8\u6709\u591a\u4e2a\u8bbe\u5907\u4f5c\u4e3a\u4e3b\u7ad9\u63a7\u5236\u603b\u7ebf\u3002\u603b\u7ebf\u4e0a\u4e3b\u548c\u4ece\u3001\u53d1\u9001\u548c\u63a5\u6536\u7684\u5173\u7cfb\u4ec5\u53d6\u51b3\u4e8e\u6bcf\u6b21\u6570\u636e\u4f20\u9001\u7684\u65b9\u5411\u3002<\/p>\n
\n\t2.2 I2C\u603b\u7ebf\u4f20\u8f93\u6570\u636e\u683c\u5f0f<\/p>\n
\n\tI2C\u603b\u7ebf\u7684\u6570\u636e\u4f20\u9001\u683c\u5f0f\u5982\u56fe4\u6240\u793a\u3002 S:start\u4fe1\u53f7; SLA\uff1a\u4ece\u673a\u5730\u5740\uff0c\u4e5f\u53ef\u4ee5\u662f\u901a\u7528\u5730\u5740; R\/W\uff1a\u8bfb\u5199\u63a7\u5236\u4f4d; A\uff1aACK\u54cd\u5e94; DATA0\uff5eDATA7\uff1a\u6bcf\u7ec4\u4f20\u90018\u4e2a\u6570\u636e\u5b57\u8282; S\/P\uff1a\u4e0b\u4e00\u4e2astart\u6216stop\u4fe1\u53f7\u3002<\/p>\n
\n\t![\"\u57fa\u4e8eI2C\u603b\u7ebf\u7684\u591a\u673a\u901a\u4fe1\u8c03\u5ea6\u6307\u6325\u7cfb\u7edf\u8bbe\u8ba1\u65b9\u6848\"](\"http:\/\/www.szryc.com\/uploads\/allimg\/190610\/101Q411B-3.jpg\")
<\/p>\n
\n\t\u56fe4<\/p>\n
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