{"id":287,"date":"2013-05-18T17:22:10","date_gmt":"2013-05-18T09:22:10","guid":{"rendered":"http:\/\/blog.sorayuki.net\/?p=287"},"modified":"2013-09-26T15:10:14","modified_gmt":"2013-09-26T07:10:14","slug":"eeprom%e7%9a%84%e6%93%8d%e4%bd%9c%e4%b8%8eds1302%e6%95%b0%e5%ad%97%e6%97%b6%e9%92%9f","status":"publish","type":"post","link":"https:\/\/blog.sorayuki.net\/?p=287","title":{"rendered":"EEPROM\u7684\u64cd\u4f5c\u4e0eDS1302\u6570\u5b57\u65f6\u949f"},"content":{"rendered":"

\u56e0\u4e3a\u6628\u5929\u5df2\u7ecf\u5f00\u59cb\u770bEEPROM\u7684\u6587\u6863\u4e86\uff0c\u4eca\u5929\u5c31\u60f3\u6309\u7167\u6587\u6863\u4e2d\u7684\u8bd5\u9a8c\u4e00\u4e0b\uff0c\u5b58\u6570\u636e\u8fdb\u53bb\u6389\u7535\u4e0d\u4f1a\u6d88\u5931\u3002\u81f3\u4e8eDS1302\u82af\u7247\uff0c\u662f\u56e0\u4e3a\u4e2d\u5348\u996d\u540e\u641e\u5b9a\u4e86EEPROM\uff0c\u6240\u4ee5\u5c31\u51b3\u5b9a\u518d\u505a\u4e00\u4e2a\u5b9e\u9a8c\u3002\u603b\u4f53\u6765\u8bf4\u4e0d\u96be\uff0c\u5173\u952e\u662f\u6709\u51e0\u4e2a\u5730\u65b9\u6389\u5751\u4e86\u2026\u2026<\/p>\n

<\/p>\n

\u6ce8\uff1a\u56e0\u4e3a\u672c\u65e0\u4ea7\u9636\u7ea7\u4e70\u4e0d\u8d77\u793a\u6ce2\u5668\uff0c\u6240\u4ee5\u8fd9\u91cc\u7684\u56fe\u662f\u51ed\u501f\u5b9e\u9a8c\u52a0\u4e0a\u60f3\u8c61\u6765\u753b\u7684\u2026\u2026<\/strong><\/p>\n

EEPROM\u7528\u7684\u82af\u7247\u662fAT24C02\uff0c\u6709256\u5b57\u8282\u7684\u5b58\u50a8\u7a7a\u95f4\u3002\u6839\u636e\u6587\u6863\uff0c\u5b83\u67098\u4e2a\u817f\uff0cA0 A1 A2\u662f\u7528\u4e8e\u8bc6\u522b\u8bbe\u5907\u7684\uff0c\u8fd9\u6837\u591a\u4e2a\u8fd9\u6837\u7684\u82af\u7247\u53ef\u4ee5\u5171\u4eab\u4e00\u4e2a\u603b\u7ebfIO\u3002\u56e0\u4e3a\u8fd9\u677f\u5b50\u4e0a\u5c31\u4e00\u4e2a\u8fd9\u79cd\u82af\u7247\uff0c\u5c31\u76f4\u63a5\u628aA0 A1 A2\u5168\u90e8\u63a5\u5730\u4e86\uff08\u90fd\u662f\u4f4e\u7535\u5e73\uff09\uff0c\u4e8e\u662f\u8fd9\u5757\u82af\u7247\u5728\u677f\u5b50\u4e0a\u7684\u8bbe\u5907ID\u5c31\u662f0\u3002Vcc\u8fde\u7535\u6e90\uff0cSDA\u6309\u7167\u677f\u5b50\u7684\u624b\u518c\uff0c\u662f\u8fde\u5728P33\u4e0a\u7684\uff0cSCL\u662f\u8fde\u5728P32\u4e0a\u7684\u3002\u901a\u8fc7P33\u548cP32\u6765\u548c\u5b83\u901a\u4fe1\u3002SDA\u8dd1\u4fe1\u53f7\u7684\uff0cSCL\u7528\u4e8e\u540c\u6b65\u7684\u3002<\/p>\n

EEPROM\u7684SCL\u662f\u7528\u6765\u540c\u6b65\u7684\uff0c\u6211\u672c\u6765\u4ee5\u4e3a\u5b83\u6bcf\u53d8\u5316\u4e00\u6b21\u7535\u5e73\u5c31\u53ef\u4ee5\u901a\u8fc7SDA\u53d1\u9001\u6216\u63a5\u6536\u4e00\u4e2a\u4fe1\u53f7\uff0c\u4f46\u662f\u7ed3\u679c\u5f53\u7136\u662f\u5931\u8d25\u7684\u2026\u2026\u5b83\u4e0d\u662f\u8fd9\u4e48\u7528\u7684\u3002\u4ed4\u7ec6\u770b\u8bf4\u660e\u4ee5\u540e\u5f97\u77e5\uff0c\u662fSCL\u53d8\u4e3a\u9ad8\u7535\u5e73\u7684\u671f\u95f4\uff0cSDA\u7528\u4e8e\u53d1\u9001\u6216\u8005\u63a5\u53d7\u6570\u636e\u3002\u4f8b\u5982\u8981\u53d1\u90011\uff0c\u5c31\u628aSDA\u5f04\u6210\u9ad8\u7535\u5e73\uff0c\u7136\u540e\u5f80SCL\u8f93\u51fa\u4e00\u4e2a\u8109\u51b2\uff08\u5148\u53d8\u9ad8\u7535\u5e73\u7136\u540e\u53d8\u56de\u6765\uff09\u3002\u53d1\u90010\u65b9\u6cd5\u76f8\u540c\uff0c\u628aSDA\u5f04\u6210\u4f4e\u7535\u5e73\uff0c\u7136\u540e\u5f80SCL\u8f93\u51fa\u4e00\u4e2a\u8109\u51b2\u3002\u63a5\u6536\u7684\u8bdd\uff0c\u5148\u628aSDA\u7f6e\u4e3a\u9ad8\u7535\u5e73\uff0c\u7136\u540e\u5f80SCL\u9001\u4e00\u4e2a\u8109\u51b2\u4fe1\u53f7\uff0c\u5728\u6b64\u8fc7\u7a0b\u4e2d\u68c0\u67e5SDA\u662f\u4e0d\u662f\u53d8\u6210\u4f4e\u7535\u5e73\u4e86\uff0c\u68c0\u67e5\u8fc7\u7a0b\u662f\u5728\u8109\u51b2\u4e4b\u4e2d\uff0c\u53c8\u8981\u8003\u8651\u5b83\u7684\u53cd\u5e94\u901f\u5ea6\u6240\u4ee5\u5728\u8109\u51b2\u4e2d\u504f\u540e\u7684\u4f4d\u7f6e\u4f3c\u4e4e\u4f1a\u6bd4\u8f83\u597d<\/strong>\u3002\u5982\u679c\u53d8\u6210\u4f4e\u7535\u5e73\uff0c\u90a3\u4e48\u8bf4\u660e\u6536\u5230\u7684\u662f0\uff1b\u5426\u5219\u8bf4\u660e\u6536\u5230\u7684\u662f1\u3002\u8fd9\u4e00\u7cfb\u5217\u82af\u7247\u80fd\u63a5\u53d7\u7684\u901f\u5ea6\u6700\u4f4e\u7684\u4f3c\u4e4e\u53ea\u6709100KHz\uff0c\u6211\u5c31\u6309\u7167\u8fd9\u4e2a100KHz\u6765\u641e\uff0c\u6162\u662f\u6162\u4e00\u70b9\u6bd5\u7adf\u662f\u5b9e\u9a8c\u3002<\/p>\n

\u5b83\u7684\u4f7f\u7528\u624b\u518c\u4e0a\u5b9a\u4e49\uff0cSCL\u9ad8\u7535\u5e73\u7684\u65f6\u5019SDA\u7684\u4fe1\u53f7\u8981\u6c42\u662f\u7a33\u5b9a\u7684\uff0c\u4fe1\u53f7\u6539\u53d8\u53ea\u80fd\u5728\u4f4e\u7535\u5e73\u7684\u65f6\u95f4\u5185\u6539\u53d8\u3002\u4e8e\u662f\u8981\u7559\u4e0b\u8db3\u591f\u591a\u7684\u65f6\u95f4\u7ed9AT24C02\u53bb\u53cd\u5e94\uff0c\u56e0\u4e3a\u5b83\u901f\u5ea6\u53ea\u6709100KHz\u3002<\/p>\n

\u6211\u53ea\u7528\u5230\u4e86\u5b83\u7684\u6307\u5b9a\u5730\u5740\u5355\u4e2a\u5b57\u8282\u8bfb\u53d6\u548c\u6307\u5b9a\u5730\u5740\u5355\u4e2a\u5b57\u8282\u5199\u5165\u529f\u80fd\u3002\u5bf9\u4e8e\u5f80\u6307\u5b9a\u5730\u5740\u5199\u4e00\u4e2a\u5b57\u8282\uff0c\u8fc7\u7a0b\u662f\uff1a\uff08A\u4ee3\u8868\u5355\u7247\u673a\u4e3b\u52a8\uff08\u8f93\u51fa\uff09\uff0cP\u4ee3\u8868\u5355\u7247\u673a\u88ab\u52a8\uff08\u8f93\u5165\uff09\uff09<\/p>\n

START(A) \u2013> \u8bbe\u5907\u7f16\u53f7(A) \u2013> ACK(P) \u2013> \u5730\u5740(A) \u2013> ACK(P) \u2013> \u6570\u636e(A) \u2013> ACK \u2013> STOP<\/p>\n

\u5176\u4e2dSTART\u7684\u5b9a\u4e49\u662f\uff0c\u4fdd\u6301SCL\u9ad8\u7535\u5e73\u7684\u540c\u65f6\uff0cSDA\u4ece\u9ad8\u7535\u5e73\u53d8\u5230\u4f4e\u7535\u5e73\u3002STOP\u7684\u5b9a\u4e49\u662f\uff0c\u4fdd\u6301SCL\u9ad8\u7535\u5e73\u7684\u540c\u65f6\uff0cSDA\u4ece\u4f4e\u7535\u5e73\u53d8\u5230\u9ad8\u7535\u5e73\u3002ACK\u7684\u5b9a\u4e49\u662f\uff0cSDA\u53d8\u4e3a\u4f4e\u7535\u5e73\uff08\u5c31\u662f\u5bf9\u65b9\u53d1\u4e86\u4e00\u4e2a0\u8fc7\u6765\uff09\u3002\u8fd9\u91cc\u9762\u6709\u4e2a\u5e94\u8be5\u8bf4\u5e38\u8bc6\u6027\u95ee\u9898\u6211\u4e0d\u77e5\u9053\u7684\u5462\u8fd8\u662f\u4ec0\u4e48\u7684\uff0c\u56e0\u4e3a\u6211\u4e4b\u524d\u4e0d\u77e5\u9053\u5f15\u811a\u7528\u4f5c\u8f93\u5165\u7684\u8bdd\u8981\u9884\u5148\u8bbe\u7f6e\u4e3a\u9ad8\u7535\u5e73\u2026\u2026\uff08\u6c57\uff09<\/p>\n

\u4e8e\u662f\u5148\u5b9a\u4e49\u4e24\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u8f93\u51fa1\u548c\u8f93\u51fa0\u3002\u7136\u540e\u7528\u8fd9\u4e24\u4e2a\u51fd\u6570\u7ec4\u6210\u53d1\u9001\/\u63a5\u6536\u4e00\u4e2a\u5b57\u8282\u7684\u529f\u80fd\uff0c\u56e0\u4e3a\u4e0a\u8ff0\u8bbe\u5907\u7f16\u53f7\u3001\u5730\u5740\u3001\u6570\u636e\u90fd\u662f8\u4f4d\uff0c\u6b63\u597d\u4e00\u4e2a\u5b57\u8282\u3002<\/p>\n

\u6d4b\u8bd5\u7684\u65f6\u5019\uff0c\u80fd\u6536\u5230ACK\u5927\u81f4\u5c31\u53ef\u4ee5\u8ba4\u4e3a\u5927\u529f\u544a\u6210\u4e86\u2026\u2026<\/p>\n

\u7136\u540e\u662f\u8bfb\u53d6\uff0c\u6bd4\u5199\u5165\u66f4\u590d\u6742\u4e0d\u5c11\u3002<\/p>\n

START(A) \u2013> \u8bbe\u5907\u7f16\u53f7(A) \u2013> ACK(P) \u2013> \u5730\u5740(A) \u2013> ACK(P) \u2013> START(A) \u2013> \u8bbe\u5907\u7f16\u53f7(A) \u2013> ACK(P) \u2013> DATA(P) \u2013> STOP<\/p>\n

\u5176\u4e2d\u524d\u534a\u90e8\u5206\u548c\u5199\u5165\u7c7b\u4f3c\uff0c\u4e0d\u8fc7\u5230\u8981\u53d1\u6570\u636e\u7684\u65f6\u5019\u53d8\u6210\u53d1\u4e00\u4e2aSTART\u8fc7\u53bb\uff0c\u4ee5\u53ca\u6700\u540e\u62ff\u5b8c\u6570\u636e\u4e0d\u9700\u8981ACK(A)\u3002<\/p>\n

\u5173\u4e8e\u91cc\u9762\u90a3\u4e2a\u8bbe\u5907\u7f16\u53f7\uff0c\u5b83\u7684\u524d4\u4f4d\u56fa\u5b9a\u662f1010\uff0c\u7136\u540e\u662fA0 A1 A2\u5f15\u811a\u51b3\u5b9a\u7684\u7f16\u53f7\uff0c\u6211\u8fd9\u8fb9\u662f\u4e09\u4e2a0\u3002\u6700\u540e\u4e00\u4f4d\u4ee3\u8868\u8bf7\u6c42\u7c7b\u578b\uff0c\u662f\u8981\u8bfb\u53d6\u8fd8\u662f\u5199\u5165\u3002\u524d\u8005\u75281\u540e\u8005\u75280\u3002\u6bd4\u5982\u8fd9\u4e2a\u60c5\u51b5\u6211\u8981\u5199\u5165\uff0c\u90a3\u4e48\u8fd9\u4e2a\u201c\u8bbe\u5907\u7f16\u53f7\u201d\u5c31\u662f10100000\u3002\u81f3\u4e8e\u5730\u5740\uff0c\u5c31\u662f0~255\u4e00\u5171256\u4e2a\u5b57\u8282\uff0cAT24C02\u7684\u5bb9\u91cf\u4e5f\u5c31\u8fd9\u4e48256\u5b57\u8282\u800c\u5df2\u3002\u6570\u636e\u5c31\u662f\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\u3002\u6ce8\u610f\u7684\u662f\u53d1\u9001\u8fc7\u7a0b\u4e2d\uff0c\u6240\u6709\u5b57\u8282\u90fd\u662f\u201c\u6700\u9ad8\u4f4d\u4f18\u5148\uff08MSF\uff09\u201d\u7684<\/strong>\u3002\u6bd4\u5982\u8981\u53d1\u90010x30\uff0c\u90a3\u4e48\u5b9e\u9645\u53d1\u9001\u7684\u6bd4\u7279\u6d41\u662f 00110000\u3002<\/p>\n

\u5b9e\u9a8c\u662f\u4e0d\u96be\u3002\u5173\u952e\u662f\u6211\u4e4b\u524d\u6389\u5751\u4e86\u2026\u2026\u5c31\u662f\u7aef\u53e3\u7528\u4e8e\u8f93\u5165\u7684\u8bdd\u8981\u5148\u8bbe\u7f6e\u4e3a\u9ad8\u7535\u5e73\u7684\u5751\u56e7\u3002<\/p>\n

\"\"<\/a><\/p>\n

 <\/p>\n

\u56e0\u4e3a\u8fd9\u4e2a\u5b9e\u9a8c\u4e2d\u5348\u996d\u540e\u5c31\u6210\u529f\u4e86\uff0c\u4e8e\u662f\u4e0b\u5348\u5c31\u51b3\u5b9a\u7814\u7a76\u4e00\u4e0bDS1302\u6570\u5b57\u65f6\u949f\u82af\u7247\u3002\u8fd9\u4e2a\u82af\u7247\u7684\u901a\u4fe1\u751a\u81f3\u6bd4\u4e0a\u9762\u90a3\u4e2a\u66f4\u7b80\u5355\uff0c\u4f46\u662f\u4e5f\u662f\u56e0\u4e3a\u5751\u2026\u2026\u554a\u554a\u4e00\u5927\u5806\u5751\uff08\u6b7b\u76ee<\/p>\n

\u5b83\u7684\u901a\u4fe1\u548cAT24C02\u6709\u70b9\u4e0d\u592a\u4e00\u6837\uff0cAT24C02\u4e0d\u662f\u4e0a\u6765\u76f4\u63a5\u7ed9\u5b83\u53d1\u9001\u6570\u636e\u5c31\u6210\u4e86\u5417\uff1fDS1302\u4e0d\u884c\uff0c\u8981\u5148\u628aCE\u5f15\u811a\u8bbe\u4e3a\u9ad8\u7535\u5e73\uff0c\u624d\u80fd\u7ed9\u5b83\u53d1\u8bf7\u6c42\u2026\u2026<\/p>\n

\u8fd8\u6709\uff0c\u5173\u4e8e\u901a\u4fe1\u7684\u65f6\u5019\u5b83\u4e5f\u662f\u4e00\u4e2a\u5f15\u811a\u540c\u6b65\u4e00\u4e2a\u5f15\u811a\u4fe1\u53f7\uff0c\u4f46\u662f\u5173\u4e8e\u540c\u6b65\u4fe1\u53f7\u7684\u5904\u7406\u6709\u4e00\u70b9\u4e0d\u540c\u3002\u867d\u7136\u53d1\u9001\u6570\u636e\u7684\u65f6\u5019\u786e\u5b9e\u4e5f\u662f\u5728\u8109\u51b2\u4e2d\u53d1\u7684\uff0c\u4f46\u662f\u4ece\u5b83\u63a5\u6536\u6570\u636e\u7684\u65f6\u5019\uff0c\u662f\u5728\u8109\u51b2\u4e4b\u540e\u63a5\u6536\uff0c\u800c\u4e0d\u662f\u8109\u51b2\u4e4b\u4e2d<\/strong>\u2026\u2026\u800c\u4e14\u5b98\u65b9\u6587\u6863\u4e2d\u6ca1\u53d1\u73b0\u5b83\u80fd\u4ee5\u591a\u5757\u7684\u9891\u7387\u5de5\u4f5c\uff0c\u4e8e\u662f\u4e5f\u4e0d\u77e5\u9053\u5230\u5e95\u5e94\u8be5\u4ee5\u4ec0\u4e48\u6837\u7684\u901f\u5ea6\u53d1\u9001\u624d\u597d\uff0c\u5c31\u80e1\u4e71\u8bbe\u4e86\u4e00\u4e2adelay\uff08\u80e1\u4e71\u2026\u2026\uff09\u3002\u53e6\u5916\u548cAT24C02\u4e0d\u540c\uff0cDS1302\u82af\u7247\u5bf9\u6570\u636e\u7684\u5904\u7406\u662f\u201c\u6700\u5c0f\u4f4d\u4f18\u5148\uff08LSF\uff09\u201d\u7684\u3002\u6bd4\u5982\u8981\u53d1\u90010x30\uff0c\u5b9e\u9645\u53d1\u9001\u7684\u6bd4\u7279\u6d41\u662f 00001100\u3002\u6bcf\u4e2a\u8bf7\u6c42\u662f\u4e00\u4e2a\u5b57\u8282\uff0c\u6bcf\u4e2a\u6570\u636e\u4e5f\u662f\u4e00\u4e2a\u5b57\u8282\uff0c\u64cd\u7eb5\u5b83\u5c31\u662f\u7ed9CE\u9ad8\u7535\u5e73\uff0c\u53d1\u9001\u4e00\u4e2a\u5b57\u8282\u7684\u8bf7\u6c42\uff0c\u7136\u540e\u6839\u636e\u8bf7\u6c42\u662f\u8bfb\u6216\u8005\u662f\u5199\uff0c\u6765\u53d1\u9001\u6216\u8005\u63a5\u6536\u4e00\u4e2a\u5b57\u8282\uff0c\u5b8c\u4e86\u53d6\u6d88CE\u7684\u9ad8\u7535\u5e73\u5373\u53ef\u3002<\/p>\n

\"\"<\/a><\/p>\n

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