单片机的芯片有哪几种，怎么样知道它们的引脚是做什么的
\u5355\u7247\u673a\u4ee5\u53ca\u5176\u4ed6\u82af\u7247\u4e0a\u7684gnd\u5f15\u811a\u4e00\u5b9a\u8981\u63a5\u771f\u6b63\u7684\u5927\u5730\u5417\uff1f\u201c\u63a5\u771f\u6b63\u7684\u5927\u5730\u201d\u53ea\u662f\u7528\u7535\u8bbe\u5907\u7684\u91d1\u5c5e\u5916\u58f3\u63a5\u5927\u5730\uff08\u5730\u7ebf\uff09\uff0c\u4e3a\u4e86\u8ba9\u4eba\u63a5\u89e6\u673a\u5668\u5916\u58f3\u4e0d\u81f4\u89e6\u7535\u800c\u5df2\uff0c\u4e0e\u8f93\u7535\u7ebf\u8def\u65e0\u5173\u3002 \u7535\u5b50\u7535\u8def\u63a5\u5730\u7684\u201c\u5171\u5730\u70b9\u201d\u662f\u7535\u8def\u7b49\u7535\u4f4d\u7684\u5171\u540c\u63a5\u70b9\uff0c\u4e0e\u7535\u6e90\u8f93\u7535\u7ebf\u8def\u7684\u63a5\u5730\u548c\u5b89\u5168\u63a5\u5730\u65e0\u5173\u3002 \u82af\u7247\u4e0a\u7684gnd\u5f15\u811a\u53ea\u662f\u63a5\u7535\u8def\u7684\u5171\u5730\u70b9\uff0c\u4e0e\u5927\u5730\u65e0\u5173\u3002
\u5982\u679c\u662f\u6570\u5b57\u4fe1\u53f7(TTL,CMOS)\uff0c\u53ef\u4ee5\u752874HC373\u9501\u5b58\u5668\u621674HC595\u79fb\u4f4d\u5bc4\u5b58\u5668\u6269\u5c55,\u9501\u5b58\u5668\u662f\u7528\u7247\u9009\u5207\u6362\uff0c\u79fb\u4f4d\u5bc4\u5b58\u5668\u662f\u4e32\u5e76\u8f6c\u6362\uff0c1\u8f6c8.
\u5982\u679c\u662f\u6a21\u62df\u4fe1\u53f7\uff0c\u53ef\u4ee5\u7528\u7c7b\u4f3c74HC4052,8-Channel Analog Multiplexer\u7684Mux\u6269\u5c55\uff0c\u7136\u540e\u7528\u65f6\u5206\u590d\u7528\u7684\u5f62\u5f0f\uff0c\u5206\u65f6\u95f4\u7247\u91c7\u6837\u3002
引脚是与外界通信的。
比如你按键需要接到引脚上去，这样按键了，单片机才会去处理。
看datasheet
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