IIC vs SPI<\/u><\/p>\n
\u73b0\u5982\u4eca\uff0c\u5728\u4e2d\u4f4e\u7aef\u6570\u5b57\u901a\u4fe1\u7cfb\u7edf\u4e3b\u8981\u7528\u9014\uff0c\u5927\u5bb6\u7ecf\u5e38\u53ef\u4ee5\u770b\u5230IIC \uff08Inte<\/u>r-Integrated Circuit\uff09 \u548c SPI \uff08Serial Peripheral Interface\uff09\u7684\u5f71\u5b50\u3002\u7f18\u6545\u662f\u8fd9\u4e8c\u79cd\u901a\u8baf\u534f\u8bae\u7279\u522b\u9002\u5408\u8fd1\u8ddd\u4f4e\u901f\u6863\u96c6\u6210ic\u95f4\u901a\u4fe1\u3002Philips\uff08for IIC\uff09\u548cMotorola\uff08for SPI\uff09 \u51fa\u81ea\u4e8e\u4e0d\u4e00\u6837\u73af\u5883\u548c\u5e02\u573a\u524d\u666f\u5236\u8ba2\u4e86\u8fd9\u4e8c\u79cd\u89c4\u8303\u901a\u8baf\u534f\u8bae\u3002<\/p>\n
\u4e3a\u4e86\u66f4\u597d\u5730\u8282\u7ea6\u5fae\u5904\u7406\u5668\u7684\u7ba1\u811a\u548c\u548c\u9644\u52a0\u7684\u903b\u8f91\u6027\u96c6\u6210ic<\/u>\uff0c\u4f7f\u5370\u5237\u7ebf\u8def\u677f<\/u>\u66f4\u7b80\u6613\uff0c\u6210\u672c\u8d39\u66f4\u4f4e\uff0c\u5750\u843d\u4e8e\u897f\u73ed\u7259\u7684Philips\u8bd5\u9a8c\u5ba4\u5f00\u53d1\u8bbe\u8ba1\u4e86 \u2018Inter-Integrated Circuit\u2019\uff0cIIC \u6216 IIC \uff0c\u4e00\u79cd\u53ea\u5e94\u7528\u4e8c\u6839\u7ebf\u8fde\u7eed\u5168\u90e8\u5916\u90e8\u96c6\u6210ic\u7684\u4e32\u53e3\u901a\u4fe1\u534f\u4e49\u3002\u6700\u5f00\u59cb\u7684\u89c4\u8303\u754c\u5b9a\u7cfb\u7edf\u603b\u7ebf\u901f\u7387\u4e3a100kbps\u3002\u5386\u7ecf\u51e0\u56de\u4fee\u5b9a\uff0c\u4e3b\u8981\u662f1995\u5e74\u7684400kbps\uff0c1998\u76843.4Mbps\u3002<\/p>\n
\u6709\u73b0\u8c61\u8868\u660e\uff0cSPI\u7cfb\u7edf\u603b\u7ebf\u521d\u6b21\u53d1\u5e03\u662f\u57281979\u5e74\uff0cMotorola\u4f01\u4e1a\u5c06SPI\u7cfb\u7edf\u603b\u7ebf\u96c6\u6210\u5316\u5728\u5979\u4eec\u7b2c\u4e00\u652f\u6539\u81ea68000\u5fae\u63a7\u5236\u5668\u7684\u5fae\u5904\u7406\u5668\u96c6\u6210ic\u4e0a\u3002SPI\u7cfb\u7edf\u603b\u7ebf\u662f\u5fae\u5904\u7406\u5668\u56db\u7ebf\u7684\u5916\u754c\u7cfb\u7edf\u603b\u7ebf\uff08\u76f8\u5bf9\u6027\u4e8e\u5167\u90e8\u7cfb\u7edf\u603b\u7ebf\uff09\u3002\u4e0eIIC\u4e0d\u4e00\u6837\uff0cSPI\u6c92\u6709\u5bc6\u6587\u89c4\u8303\uff0c\u4ec5\u4ec5\u4e00\u79cd\u4e8b\u5b9e\u6807\u51c6\uff0c\u5bf9\u901a\u8baf\u5b9e\u9645\u64cd\u4f5c\u7684\u5b8c\u6210\u53ea\u4f5c\u4e00\u822c\u7684\u62bd\u8c61\u6027\u53d9\u8ff0\uff0c\u96c6\u6210ic\u751f\u4ea7\u5546\u4e0e\u63a8\u52a8\u5f00\u53d1\u4eba\u5458\u6839\u636edata sheets\u548capplication notes\u6c9f\u901a\u4ea4\u6d41\u5b8c\u6210\u4e0a\u7684\u5173\u952e\u70b9\u3002<\/p>\n
SPI<\/p>\n
\u9488\u5bf9\u6709\u5de5\u4f5c\u7ecf\u9a8c\u7684\u6570\u636e\u7535\u5b50\u5de5\u7a0b\u5e08\u800c\u8a00\uff0c\u7528SPI\u4e92\u8fde\u4e24\u53ea\u6570\u636e\u673a\u5668\u8bbe\u5907\u662f\u975e\u5e38\u5f62\u8c61\u5316\u7684\u3002SPI\u662f\u79cd\u56db\u6839\u7535\u6e90\u7ebf<\/u>\u534f\u4e49\uff08\u5982\u4e0b\u56fe\uff09\uff1a<\/p>\n
SCLK\uff1a Serial Clock \uff08output from master\uff09;<\/p>\n
MOSI; SIMO\uff1a Master Output\uff0c Slave Input\uff08output from master\uff09;<\/p>\n
MI<\/u>SO; SOMI\uff1a Master Input\uff0c Slave Output\uff08output from slave\uff09;<\/p>\n
SS\uff1a Slave Select \uff08active low\uff0c outputfrom master\uff09\u3002<\/p>\n
SPI\u662f\uff3b\u5355\u5173\u952e\u8bbe\u5907\uff08 single-master \uff09\uff3d\u901a\u8baf\u534f\u8bae\uff0c\u8fd9\u4ee3\u8868\u7740\u7cfb\u7edf\u603b\u7ebf\u4e2d\u7684\u4ec5\u6709\u4e00\u652f\u6838\u5fc3\u673a\u5668\u8bbe\u5907\u80fd\u8fdb\u884c\u901a\u8baf\u3002\u5f53SPI\u5173\u952e\u8bbe\u5907\u60f3\u62a5\/\u5199\uff3b\u4ece\u673a\u5668\u8bbe\u5907\uff3d\u65f6\uff0c\u5b83\u6700\u5148\u964d\u4f4e\uff3b\u4ece\u673a\u5668\u8bbe\u5907\uff3d\u76f8\u5339\u914d\u7684SS\u7ebf\uff08SS\u662f\u4f4e\u7535\u9891\u5408\u7406\uff09\uff0c\u7136\u540e\u9010\u6e10\u63a8\u9001\u5de5\u4f5c\u4e2d\u5355\u8109\u51b2\u5230\u949f\u8868<\/u>\u7f51\u4e0a\uff0c\u5728\u5bf9\u5e94\u7684\u5355\u8109\u51b2\u6642\u95f4\u4e0a\uff0c\uff3b\u5173\u952e\u8bbe\u5907\uff3d\u628a\u6570\u636e\u4fe1\u53f7\u53d1\u81f3MOSI\u5b8c\u6210\u201c\u5199\u201d\uff0c\u4e0e\u6b64\u540c\u65f6\u53ef\u5bf9MISO\u53d6\u6837\u800c\u5b8c\u6210\u201c\u8bfb\u201d\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n
<\/p>\n
SPI\u6709\u56db\u79cd\u5b9e\u9645\u64cd\u4f5c\u65b9\u5f0f\u2014\u2014\u65b9\u5f0f0\u3001\u65b9\u5f0f1\u3001\u65b9\u5f0f2\u548c\u65b9\u5f0f3\uff0c\u4ed6\u4eec\u7684\u533a\u5206\u662f\u754c\u5b9a\u4e86\u5728\u8109\u51b2\u53d1\u751f\u5668\u7684\u54ea\u4e2a\u8fb9\u7f18\u53d8\u6362\uff08toggles\uff09\u5bfc\u51fa\u6570\u636e\u4fe1\u53f7\uff0c\u54ea\u4e2a\u8fb9\u7f18\u53d6\u6837\u952e\u5165\u6570\u636e\u4fe1\u53f7\uff0c\u4e5f\u6709\u8109\u51b2\u53d1\u751f\u5668\u7684\u5e73\u7a33\u8109\u51b2\u4fe1\u53f7\u503c\uff08\u4fbf\u662f\u65f6\u949f\u4fe1\u53f7\u5931\u6548\u65f6\u662f\u9ad8\u9084\u662f\u4f4e\uff09\u3002\u6bcf\u4e00\u79cd\u65b9\u5f0f\u7531\u4e00\u5bf9\u4e3b\u8981\u53c2\u6570\u63cf\u7ed8\uff0c\u4ed6\u4eec\u79f0\u4e4b\u4e3a\u949f\u8868\u6781\uff08clock polarity\uff09CPOL\u4e0e\u949f\u8868\u671f\uff08clock phase\uff09CPHA\u3002<\/p>\n
<\/p>\n
\uff3b\u4e3b\u4ece\u5173\u7cfb\u673a\u5668\u8bbe\u5907\uff3d\u52a1\u5fc5\u5e94\u7528\u540c\u6837\u7684\u8fd0\u884c\u4e3b\u8981\u53c2\u6570\u2014\u2014SCLK\u3001CPOL \u548c CPHA\uff0c\u624d\u53ef\u4ee5\u6b63\u5e38\u7684\u5de5\u4f5c\u4e2d\u3002\u5982\u679c\u6709\u597d\u51e0\u4e2a\uff3b\u4ece\u673a\u5668\u8bbe\u5907\uff3d\uff0c\u800c\u4e14\u4ed6\u4eec\u5e94\u7528\u4e86\u4e0d\u4e00\u6837\u7684\u8fd0\u884c\u4e3b\u8981\u53c2\u6570\uff0c\u90a3\u9ebc\uff3b\u5173\u952e\u8bbe\u5907\uff3d\u52a1\u5fc5\u5728\u8bfb\u5199\u80fd\u529b\u4e0d\u4e00\u6837\uff3b\u4ece\u673a\u5668\u8bbe\u5907\uff3d\u95f4\u91cd\u65b0\u90e8\u7f72\u8fd9\u79cd\u4e3b\u8981\u53c2\u6570\u3002\u4ee5\u4e0aSPI\u7cfb\u7edf\u603b\u7ebf\u534f\u4e49\u7684\u5177\u4f53\u5185\u5bb9\u3002SPI\u4e0d\u8981\u6c42\u8f83\u5927\u4f20\u8f93\u901f\u5ea6\uff0c\u6c92\u6709\u8be6\u7ec6\u5730\u5740\u8ba1\u5212\u65b9\u6848\uff1bSPI\u4e5f\u6ca1\u8981\u6c42\u901a\u8baf\u56de\u590d\u4f53\u5236\uff0c\u6c92\u6709\u8981\u6c42\u6d41\u63a7\u5236\u6807\u51c6\u3002\u5b9e\u9645\u4e0a\uff0cSPI\uff3b\u5173\u952e\u8bbe\u5907\uff3d\u4e43\u81f3\u5e76\u4e0d\u4e86\u89e3\u7279\u5b9a\u7684\uff3b\u4ece\u673a\u5668\u8bbe\u5907\uff3d\u662f\u4e0d\u662f\u5b58\u6709\u3002\u8fd9\u79cd\u901a\u8baf\u64cd\u7eb5\u90fd\u5f97\u6839\u636eSPI\u534f\u4e49\u4e4b\u5916\u81ea\u4e3b\u5b8c\u6210\u3002\u6bd4\u5982\uff0c\u5f97\u7528SPI\u8054\u63a5\u4e00\u652f\uff3b\u6307\u4ee4-\u56de\u5e94\u64cd\u7eb5\u578b\uff3d\u7f16\u89e3\u7801\u96c6\u6210ic\uff0c\u5219\u52a1\u5fc5\u5728SPI\u7684\u6839\u57fa\u4e0a\u5b8c\u6210\u66f4\u9ad8\u7b49\u7ea7\u7684\u901a\u8baf\u534f\u8bae\u3002SPI\u5e76\u4e0d\u5173\u6ce8\u7269\u7406\u5b66\u63d2\u53e3<\/u>\u7684\u7535\u6c14\u8bbe\u5907\u7279\u70b9\uff0c\u6bd4\u5982\u6570\u636e\u4fe1\u53f7\u7684\u89c4\u8303\u5de5\u4f5c\u7535\u538b\u3002\u5728\u6700\u5f00\u59cb\uff0c\u5927\u90e8\u5206SPI\u8fd0\u7528\u5168\u662f\u5e94\u7528\u95f4\u9694\u6027\u8109\u51b2\u53d1\u751f\u5668\u548c\u4ee5\u5b57\u8282\u6570\u4e3a\u4f01\u4e1a\u4f20\u9001\u6570\u636e\u7684\uff0c\u4f46\u73b0\u5728\u6709\u8bb8\u591a\u53d8\u5f02\u5b8c\u6210\u4e86\u6301\u7eed\u6027\u6642\u95f4\u5355\u8109\u51b2\u548c\u968f\u610f\u957f\u77ed\u7684\u6570\u636e\u5e27\u3002<\/p>\n
IIC<\/p>\n
\u4e0eSPI\u7684\u5355\u5173\u952e\u8bbe\u5907\u4e0d\u4e00\u6837\uff0cIIC \u662f\u591a\u5173\u952e\u8bbe\u5907\u7684\u7cfb\u7edf\u603b\u7ebf\uff0cIIC\u6c92\u6709\u7269\u7406\u5b66\u7684\u96c6\u6210ic\u6311\u9009\u7535\u6e90\u7ebf\uff0c\u6c92\u6709\u8bc9\u8bbc\u903b\u8f91\u6027\u7535\u6e90\u7535\u8def<\/u>\uff0c\u53ea\u5e94\u7528\u4e24\u6839\u7535\u6e90\u7ebf\u2014\u2014 \u2018serial data\u2019 \uff08SDA\uff09 \u548c \u2018serial clock\u2019 \uff08SCL\uff09\u3002IIC\u534f\u4e49\u8981\u6c42\uff1a<\/p>\n
\u7b2c\u4e00\uff0c\u6bcf\u4e00\u652fIIC\u673a\u5668\u8bbe\u5907\u90fd\u662f\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u4e03\u4f4d\u673a\u5668\u8bbe\u5907\u8be6\u7ec6\u5730\u5740\uff1b<\/p>\n
\u7b2c\u4e8c\uff0c\u6570\u636e\u5e27\u5c3a\u5bf8\u4e3a8\u4f4d\u7684\u5b57\u8282\u6570\uff1b<\/p>\n
\u7b2c\u4e09\uff0c\u6570\u636e\u4fe1\u606f\uff08\u5e27\uff09\u4e2d\u7684\u4e00\u4e9b\u6570\u636e\u4f4d\u7528\u4ee5\u64cd\u7eb5\u901a\u8baf\u7684\u9010\u6e10\u3001\u7ec8\u6b62\u3001\u65b9\u4f4d\uff08\u8bfb\u5199\u80fd\u529b\uff09\u548c\u56de\u590d\u4f53\u5236\u3002<\/p>\n
IIC \u6570\u636e\u4fe1\u606f\u4f20\u8f93\u901f\u5ea6\u6709\u6807\u51c6\u6a21\u5f0f\uff08100 kbps\uff09\u3001\u8fc5\u901f\u65b9\u5f0f\uff08400 kbps\uff09\u548c\u5feb\u901f\u65b9\u5f0f\uff083.4 Mbps\uff09\uff0c\u6b64\u5916\u4e00\u4e9b\u53d8\u5f02\u5b8c\u6210\u4e86\u4f4e\u901f\u6863\u65b9\u5f0f\uff0810 kbps\uff09\u548c\u8fc5\u901f \u65b9\u5f0f\uff081 Mbps\uff09\u3002<\/p>\n
\u7269\u7406\u5b66\u5b8c\u6210\u4e0a\uff0cIIC \u7cfb\u7edf\u603b\u7ebf\u7531\u4e8c\u6839\u7535\u6e90\u7ebf\u548c\u4e00\u6839\u63a5\u5730\u7ebf\u6784\u6210\u3002\u4e8c\u6839\u7535\u6e90\u7ebf\u5168\u662f\u53cc\u91cd\u4f20\u9001\u7684\uff0c\u53c2\u7167\u4e0b\u9762\u7684\u56fe\u3002IIC\u534f\u4e49\u6807\u51c6\u8fdb\u884c\u901a\u8baf\u7684\u673a\u5668\u8bbe\u5907\u79f0\u4e3a\u4e3b\u5bfc\u673a\u5668\u8bbe\u5907\uff0c\u5173\u952e\u8bbe\u5907\u8fdb\u884c\u4e00\u6b21\u901a\u8baf\u540e\uff0c\u5176\u4ed6\u673a\u5668\u8bbe\u5907\u5747\u4e3a\u4ece\u673a\u5668\u8bbe\u5907\u3002<\/p>\n
<\/p>\n
IIC \u901a\u8baf\u5168\u8fc7\u7a0b\u5927\u7ea6\u5982\u4e0b\u6240\u793a\u3002\u6700\u5148\uff0c\u5173\u952e\u8bbe\u5907\u53d1\u4e00\u4e2aSTART\u6570\u636e\u4fe1\u53f7\uff0c\u8fd9\u4e00\u6570\u636e\u4fe1\u53f7\u5982\u540c\u5bf9\u5168\u90e8\u5176\u4ed6\u673a\u5668\u8bbe\u5907\u558a\uff1a\u8bf7\u5927\u4f19\u513f\u7559\u610f\uff01\u968f\u540e\u5176\u4ed6\u673a\u5668\u8bbe\u5907\u9010\u6e10\u76d1\u89c6\u7cfb\u7edf\u603b\u7ebf\u4ee5\u63d0\u524d\u51c6\u5907\u8bfb\u53d6\u6570\u636e\u3002\u7136\u540e\uff0c\u5173\u952e\u8bbe\u5907\u63a8\u9001\u4e00\u4e2a7\u4f4d\u673a\u5668\u8bbe\u5907\u8be6\u7ec6\u5730\u5740\u52a0\u4e00\u4f4d\u7684\u5b58\u53d6\u6570\u636e\u7684\u6570\u636e\u5e27\u3002\u5f53\u6240\u673a\u5668\u8bbe\u5907\u8bfb\u53d6\u6570\u636e\u540e\uff0c\u6838\u5bf9\u8be6\u7ec6\u5730\u5740\u81ea\u8eab\u662f\u4e0d\u662f\u603b\u4f53\u76ee\u6807\u673a\u5668\u8bbe\u5907\u3002\u5047\u5982\u6838\u5bf9\u4e0d\u7b26\u5408\uff0c\u673a\u5668\u8bbe\u5907\u8fdb\u5230\u7b49\u5019\u60c5\u51b5\uff0c\u7b49\u5019STOP\u6570\u636e\u4fe1\u53f7\u7684\u5230\u6765\uff1b\u5047\u5982\u6838\u5bf9\u76f8\u7b26\u5408\uff0c\u673a\u5668\u8bbe\u5907\u4f1a\u63a8\u9001\u4e00\u4e2a\u56de\u590d\u6570\u636e\u4fe1\u53f7\u2014\u2014ACKNOWLED<\/u>GE\u4f5c\u56de\u590d\u3002<\/p>\n
\u5f53\u5173\u952e\u8bbe\u5907\u63a5\u5230\u56de\u590d\u540e\u4fbf\u9010\u6e10\u4f20\u8f93\u6216\u8bfb\u53d6\u6570\u636e\u3002\u6570\u636e\u5e27\u5c3a\u5bf8\u4e3a8\u4f4d\uff0c\u8ddf\u968f\u4e00\u4f4d\u7684\u56de\u590d\u6570\u636e\u4fe1\u53f7\u3002\u5173\u952e\u8bbe\u5907\u4f20\u9001\u6570\u636e\uff0c\u4ece\u673a\u5668\u8bbe\u5907\u56de\u590d\uff1b\u53cd\u8fc7\u6765\u5173\u952e\u8bbe\u5907\u63a5\u6570\u636e\u4fe1\u606f\uff0c\u5173\u952e\u8bbe\u5907\u56de\u590d\u3002\u5f53\u6570\u636e\u4fe1\u606f\u4f20\u8f93\u7ed3\u675f\uff0c\u5173\u952e\u8bbe\u5907\u63a8\u9001\u4e00\u4e2aSTOP\u6570\u636e\u4fe1\u53f7\uff0c\u5411\u5176\u4ed6\u673a\u5668\u8bbe\u5907\u5ba3\u5e03\u91ca\u653e\u51fa\u6765\u7cfb\u7edf\u603b\u7ebf\uff0c\u5176\u4ed6\u673a\u5668\u8bbe\u5907\u8fd4\u56de\u521d\u59cb\u503c\u3002<\/p>\n
<\/p>\n
\u6839\u636eIIC\u7cfb\u7edf\u603b\u7ebf\u7684\u7269\u7406\u5b66\u6784\u9020\uff0c\u7cfb\u7edf\u603b\u7ebf\u4e0a\u7684START\u548cSTOP\u6570\u636e\u4fe1\u53f7\u5fc5\u7136\u662f\u552f\u4e00\u7684\u3002\u6b64\u5916\uff0cIIC\u7cfb\u7edf\u603b\u7ebf\u6807\u51c6SDA\u7ebf\u7684\u6570\u636e\u4ea4\u6362\u52a1\u5fc5\u5728SCL\u7ebf\u7684\u4f4e\u7535\u9891\u671f\uff0c\u5728SCL\u7ebf\u7684\u9ad8\u7535\u5e73\u671f\uff0cSDA\u7ebf\u7684\u4e0a\u6570\u636e\u4fe1\u606f\u662f\u6bd4\u8f83\u7a33\u5b9a\u7684\u3002<\/p>\n
<\/p>\n
\u5728\u7269\u7406\u5b66\u5b8c\u6210\u4e0a\uff0cSCL\u7ebf\u548cSDA\u7ebf\u5168\u662f\u6f0f\u6781\u5f15\u8def\uff08open-drain\uff09\uff0c\u6839\u636e\u4e0b\u62c9\u7535\u963b\u5668<\/u>\u53e6\u52a0\u4e00\u4e2a\u7535\u538b\u6e90\u3002\u5f53\u628a\u8def\u7ebf\u63a5\u5730\u88c5\u7f6e\u65f6\uff0c\u8def\u7ebf\u4e3a\u65b9\u5f0f0\uff0c\u5f53\u91ca\u653e\u51fa\u6765\u8def\u7ebf\uff0c\u8def\u7ebf\u7a7a\u4f59\u65f6\uff0c\u8def\u7ebf\u4e3a\u903b\u8f91\u60271\u3002\u6839\u636e\u8fd9\u79cd\u7279\u70b9\uff0cIIC\u673a\u5668\u8bbe\u5907\u5bf9\u7cfb\u7edf\u603b\u7ebf\u7684\u5b9e\u9645\u64cd\u4f5c\u4ec5\u6709\u201c\u628a\u8def\u7ebf\u63a5\u5730\u88c5\u7f6e\u201d\u2014\u2014\u5bfc\u51fa\u903b\u8f91\u60270\u3002<\/p>\n
IIC\u7cfb\u7edf\u603b\u7ebf\u8bbe\u8ba1\u65b9\u6848\u53ea\u5e94\u7528\u4e86\u4e24\u6761\u7ebf\uff0c\u4f46\u975e\u5e38\u5927\u6c14\u5730\u5b8c\u6210\u968f\u610f\u6570\u989d\u673a\u5668\u8bbe\u5907\u95f4\u65e0\u7f1d\u62fc\u63a5\u901a\u8baf\uff0c\u79f0\u5f97\u4e0a\u6781\u81f4\u3002\u5927\u5bb6\u5047\u8bbe\u4e00\u4e0b\uff0c\u5982\u679c\u6709\u4e24\u53ea\u673a\u5668\u8bbe\u5907\u4e0e\u6b64\u540c\u65f6\u5411SCL\u7ebf\u548cSDA\u7ebf\u53d1\u9001\u77ed\u4fe1\u4f1a\u53d1\u751f\u4ec0\u4e48\u539f\u56e0\u3002<\/p>\n
\u6839\u636eIIC\u7cfb\u7edf\u603b\u7ebf\u7684\u8bbe\u8ba1\u65b9\u6848\uff0c\u8def\u7ebf\u4e0a\u4e0d\u592a\u53ef\u80fd\u53d1\u751f\u8109\u51b2\u4fe1\u53f7\u77db\u76fe\u72b6\u51b5\u3002\u5047\u5982\u4e00\u652f\u673a\u5668\u8bbe\u5907\u63a8\u9001\u903b\u8f91\u60270\uff0c\u5176\u4ed6\u63a8\u9001\u903b\u8f91\u60271\uff0c\u90a3\u9ebc\u8def\u7ebf\u89c1\u5230\u7684\u4ec5\u6709\u903b\u8f91\u60270\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5047\u5982\u53d1\u751f\u8109\u51b2\u4fe1\u53f7\u77db\u76fe\uff0c\u63a8\u9001\u903b\u8f91\u60270\u7684\u4e00\u76f4\u662f\u201c\u5927\u8d62\u5bb6\u201d\u3002<\/p>\n
\u7cfb\u7edf\u603b\u7ebf\u7684\u7269\u7406\u5b66\u6784\u9020\u4ea6\u5bb9\u8bb8\u5173\u952e\u8bbe\u5907\u5728\u5f80\u7cfb\u7edf\u603b\u7ebf\u5199\u6570\u636e\u4fe1\u606f\u7684\u4e0e\u6b64\u540c\u65f6\u63a5\u6536\u6570\u636e\u3002\u90a3\u6837\uff0c\u4e00\u5207\u673a\u5668\u8bbe\u5907\u90fd\u80fd\u591f\u68c0\u9a8c\u77db\u76fe\u7684\u4ea7\u751f\u3002\u5f53\u4e24\u53ea\u5173\u952e\u8bbe\u5907\u5e02\u573a\u7ade\u4e89\u7cfb\u7edf\u603b\u7ebf\u7684\u60c5\u51b5\u4e0b\uff0c\u201c\u5927\u8d62\u5bb6\u201d\u5e76\u4e0d\u4e86\u89e3\u5e02\u573a\u7ade\u4e89\u7684\u4ea7\u751f\uff0c\u4ec5\u6709\u201c\u5931\u8d25\u8005\u201d\u53d1\u89c9\u4e86\u77db\u76fe\u2014\u2014\u5f53\u5b83\u5199\u4e00\u4e2a\u903b\u8f91\u60271\uff0c\u5374\u770b\u52300\u65f6\u2014\u2014\u800c\u64a4\u51fa\u5e02\u573a\u7ade\u4e89\u3002<\/p>\n
10\u4f4d\u673a\u5668\u8bbe\u5907\u8be6\u7ec6\u5730\u5740<\/p>\n
\u4e00\u5207IIC\u673a\u5668\u8bbe\u5907\u90fd\u662f\u6709\u4e00\u4e2a7\u4f4d\u8be6\u7ec6\u5730\u5740\uff0c\u7406\u8bba\u4e0a\uff0c\u5b9e\u9645\u4e2d\u53ea\u6709\u6709127\u79cd\u4e0d\u4e00\u6837\u7684IIC\u673a\u5668\u8bbe\u5907\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5df2\u7ecf\u6709IIC\u7684\u673a\u5668\u8bbe\u5907\u7c7b\u578b\u8fdc\u8fdc\u5730\u8d85\u8fc7\u8fd9\u4e00\u9650\u5b9a\uff0c\u5728\u4e00\u6761\u7cfb\u7edf\u603b\u7ebf\u4e0a\u53d1\u751f\u4e00\u6837\u7684\u8be6\u7ec6\u5730\u5740\u7684IIC\u673a\u5668\u8bbe\u5907\u7684\u51e0\u7387\u975e\u5e38\u9ad8\u3002\u4e3a\u4e86\u66f4\u597d\u5730\u63d0\u5347\u8fd9\u4e00\u9650\u5b9a\uff0c\u8bb8\u591a\u673a\u5668\u8bbe\u5907\u5e94\u7528\u4e86\u53cc\u5411\u8be6\u7ec6\u5730\u5740\u2014\u20147\u4f4d\u8be6\u7ec6\u5730\u5740\u52a0\u7ba1\u811a\u8be6\u7ec6\u5730\u5740\uff08external configurati<\/u>on pins\uff09\u3002IIC \u89c4\u8303\u4e5f\u9884\u6599\u4e86\u8fd9\u7c7b\u9650\u5b9a\uff0c\u660e\u786e\u63d0\u51fa10\u4f4d\u7684\u8be6\u7ec6\u5730\u5740\u8ba1\u5212\u65b9\u6848\u3002<\/p>\n
10\u4f4d\u7684\u8be6\u7ec6\u5730\u5740\u8ba1\u5212\u65b9\u6848\u5bf9 IIC\u534f\u4e49\u7684\u4e0d\u826f\u5f71\u54cd\u6709\u4e8c\u70b9\uff1a<\/p>\n
\u7b2c\u4e00\uff0c\u8be6\u7ec6\u5730\u5740\u5e27\u4e3a2\u4e2a\u5b57\u8282\u6570\u957f\uff0c\u539f\u5148\u7684\u662f\u4e00\u4e2a\u5b57\u8282\uff1b<\/p>\n
\u7b2c\u4e8c\uff0c\u7b2c\u4e00\u4e2a\u5b57\u8282\u6570\u524d\u4e94\u4f4d\u6700\u5927\u5408\u7406\u4f4d\u4f5c\u4e3a10\u4f4d\u8be6\u7ec6\u5730\u5740\u6807\u5fd7\uff0c\u627f\u8bfa\u662f\u201c11110\u201d\u3002<\/p>\n
<\/p>\n
\u9664\u5f0010\u4f4d\u8be6\u7ec6\u5730\u5740\u6807\u5fd7\uff0c\u89c4\u8303\u8fd8\u7559\u6709\u4e86\u4e00\u4e9b\u5730\u5740\u7801\u4f5c\u4e3a\u5176\u4ed6\u4e3b\u8981\u7528\u9014\uff0c\u5982\u4e0b\u6240\u793a\u8868\uff1a<\/p>\n
<\/p>\n
\u949f\u8868\u62c9\u7533<\/p>\n
\u5728 IIC \u901a\u8baf\u4e2d\uff0c\u5173\u952e\u8bbe\u5907\u51b3\u7b56\u4e86\u949f\u8868\u901f\u7387\u3002\u7531\u4e8e\u8109\u51b2\u53d1\u751f\u5668\u6570\u636e\u4fe1\u53f7\u662f\u7531\u5173\u952e\u8bbe\u5907\u663e\u5f0f\u4f20\u51fa\u7684\u3002\u53ef\u662f\uff0c\u5f53\u4ece\u673a\u5668\u8bbe\u5907\u6ca1\u6cd5\u7d27\u8ddf\u5173\u952e\u8bbe\u5907\u7684\u901f\u7387\u65f6\uff0c\u4ece\u673a\u5668\u8bbe\u5907\u5fc5\u987b\u4e00\u79cd\u4f53\u5236\u6765\u8981\u6c42\u5173\u952e\u8bbe\u5907\u6162\u4e00\u70b9\u3002\u8fd9\u7c7b\u4f53\u5236\u79f0\u4e4b\u4e3a\u949f\u8868\u62c9\u7533\uff0c\u800c\u6839\u636eI\u00b2C\u8bbe\u8ba1\u7684\u72ec\u7279\u6027\uff0c\u8fd9\u7c7b\u4f53\u5236\u83b7\u5f97\u5b8c\u6210\u3002\u5f53\u4ece\u673a\u5668\u8bbe\u5907\u5fc5\u987b\u51cf\u5c11\u4f20\u9001\u7684\u901f\u7387\u7684\u60c5\u51b5\u4e0b\uff0c\u5b83\u53ef\u4ee5\u6309\u4f4f\u949f\u8868\u7ebf\uff0c\u8feb\u4f7f\u5173\u952e\u8bbe\u5907\u8fdb\u5230\u7b49\u5019\u60c5\u51b5\uff0c\u76f4\u5230\u4ece\u673a\u5668\u8bbe\u5907\u91ca\u653e\u51fa\u6765\u949f\u8868\u7ebf\uff0c\u901a\u8baf\u624d\u518d\u6b21\u3002<\/p>\n
\u5feb\u901f\u65b9\u5f0f<\/p>\n
\u57fa\u672c\u539f\u7406\u4e0a\u8bb2\uff0c\u5e94\u7528\u4e0a\u62c9\u7535\u963b\u6765\u8bbe\u5b9a\u903b\u8f91\u60271\u4f1a\u9650\u5b9a\u7cfb\u7edf\u603b\u7ebf\u7684\u8f83\u5927\u4f20\u8f93\u901f\u7387\u3002\u800c\u901f\u7387\u662f\u9650\u5b9a\u7cfb\u7edf\u603b\u7ebf\u8fd0\u7528\u7684\u539f\u56e0\u4e4b\u4e00\u3002\u8fd9\u4e5f\u8868\u660e\u4e3a\u4f55\u8981\u5f15\u8fdb\u5feb\u901f\u65b9\u5f0f\uff083.4 Mbps\uff09\u3002\u5728\u8fdb\u884c\u4e00\u6b21\u5feb\u901f\u65b9\u5f0f\u4f20\u9001\u524d\uff0c\u5173\u952e\u8bbe\u5907\u52a1\u5fc5\u5148\u5728\u4f4e\u901f\u6863\u7684\u65b9\u5f0f\u4e0b\uff08\u6bd4\u5982\u8fc5\u901f\u65b9\u5f0f\uff09\u4f20\u51fa\u7279\u6b8a\u7684\u201cHigh Speed Master\u201d\u6570\u636e\u4fe1\u53f7\u3002\u4e3a\u51cf\u5c11\u6570\u636e\u4fe1\u53f7\u7684\u5468\u671f\u65f6\u95f4\u548c\u63d0\u5347\u7cfb\u7edf\u603b\u7ebf\u901f\u7387\uff0c\u5feb\u901f\u65b9\u5f0f\u52a1\u5fc5\u5e94\u7528\u9644\u52a0\u7684I\/O\u7f13\u51b2\u533a\u57df\u3002\u6b64\u5916\uff0c\u7cfb\u7edf\u603b\u7ebf\u8bc9\u8bbc\u5728\u5feb\u901f\u65b9\u5f0f\u4e0b\u53ef\u5c4f\u853d\u3002\u5927\u91cf\u7684\u4fe1\u606f\u5185\u5bb9\u8bf7\u53c2\u52a0\u7cfb\u7edf\u603b\u7ebf\u89c4\u8303\u6587\u672c\u6587\u6863\u3002<\/p>\n
IIC vs SPI\uff1a \u54ea\u4e00\u4f4d\u662f\u5927\u8d62\u5bb6\uff1f<\/p>\n
\u5927\u5bb6\u6765\u5bf9\u7167\u4e00\u4e0bIIC \u548c SPI\u7684\u4e00\u4e9b\u5173\u952e\u73af\u8282\uff1a<\/p>\n
\u7b2c\u4e00\uff0c\u7cfb\u7edf\u603b\u7ebf\u7f51\u7edc\u62d3\u6251\u7ed3\u6784\/\u6570\u636e\u4fe1\u53f7\u8def\u7531\u5668\/\u786c\u4ef6\u5e73\u53f0\u6d88\u8017<\/p>\n
IIC \u53ea\u9700\u4e8c\u6839\u7535\u6e90\u7ebf\uff0c\u800c\u89c4\u8303SPI\u6700\u5c11\u56db\u6839\u6570\u636e\u4fe1\u53f7\uff0c\u5982\u679c\u6709\u597d\u51e0\u4e2a\u4ece\u673a\u5668\u8bbe\u5907\uff0c\u6570\u636e\u4fe1\u53f7\u5fc5\u987b\u5927\u91cf\u3002\u4e00\u4e9bSPI\u53d8\u5f02\u5c3d\u7ba1\u53ea\u5e94\u7528\u4e09\u6839\u7ebf\u2014\u2014SCLK\uff0c SS\u548c\u53cc\u91cd\u7684MISO\/MOSI\uff0c\u4f46SS\u7ebf\u6216\u662f\u8981\u548c\u4ece\u673a\u5668\u8bbe\u5907\u4e00\u5bf9\u4e00\u6839\u3002\u6b64\u5916\uff0c\u5047\u5982SPI\u8981\u5b8c\u6210\u591a\u5173\u952e\u8bbe\u5907\u6784\u9020\uff0c\u7cfb\u7edf\u603b\u7ebf\u7cfb\u7edf\u8f6f\u4ef6\u9700\u9644\u52a0\u7684\u903b\u8f91\u5173\u7cfb\u548c\u8def\u7ebf\u3002\u7528IIC \u642d\u5efa\u7cfb\u7edf\u603b\u7ebf\u552f\u4e00\u7684\u95ee\u9898\u662f\u6709\u5c40\u9650\u76847\u4f4d\u8be6\u7ec6\u5730\u5740\u5ba4\u5185\u7a7a\u95f4\uff0c\u4f46\u8fd9\u4e2a\u95ee\u9898\u65b0\u6807\u51c6\u65e9\u5df2\u5904\u7406\u2014\u2014\u5e94\u752810\u4f4d\u8be6\u7ec6\u5730\u5740\u3002\u4ece\u7b2c\u4e00\u70b9\u4e0a\u770b\uff0cIIC\u662f\u663e\u8457\u7684\u5927\u5b34\u5bb6\u3002<\/p>\n
\u7b2c\u4e8c\uff0c\u6570\u636e\u4fe1\u606f\u541e\u5410\/\u4f20\u8f93\u901f\u7387<\/p>\n
\u5047\u5982\u8fd0\u7528\u4e2d\u52a1\u5fc5\u5e94\u7528\u5feb\u901f\u4f20\u8f93\u6570\u636e\uff0c\u90a3\u9ebcSPI\u662f\u5fc5\u5b9a\u7684\u6311\u9009\u3002\u7531\u4e8eSPI\u662f\u53cc\u5de5\uff0cIIC \u7684\u5e76\u4e0d\u662f\u3002SPI\u6c92\u6709\u754c\u5b9a\u7f51\u901f\u9650\u5236\uff0c\u4e00\u822c\u7684\u5b8c\u6210\u901a\u5e38\u80fd\u505a\u5230\u4e43\u81f3\u8d85\u51fa10 Mbps\u3002IIC \u6700\u5927\u7684\u901f\u7387\u4e5f\u5c31\u8fc5\u901f \u65b9\u5f0f\uff081 Mbps\uff09\u548c\u5feb\u901f\u65b9\u5f0f\uff083.4 Mbps\uff09\uff0c\u540e\u8fb9\u7684\u65b9\u5f0f\u8fd8\u5fc5\u987b\u53e6\u5916\u7684I\/O\u7f13\u51b2\u533a\u57df\uff0c\u8fd8\u5e76\u5e76\u4e0d\u662f\u4e00\u76f4\u975e\u5e38\u5bb9\u6613\u5b8c\u6210\u7684\u3002<\/p>\n
\u7b2c\u4e09\uff0c\u96c5\u81f4\u6027<\/p>\n
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