怎样使STC89C52的IO口处于输入状态 在89C52单片机里面怎么用程序把I/O设定为高阻态状态??
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B\u3001\u5982\u679c\u6709\u4e0a\u62c9\u7535\u963b\u90a3\u5b83\u7684\u7aef\u53e3\u5728\u9ed8\u8ba4\u503c\u4e3a\u9ad8\u7535\u5e73\uff0c\u4f60\u8981\u63a7\u5236\u5b83\u5fc5\u987b\u7528\u4f4e\u7535\u5e73\u624d\u80fd\u63a7\u5236\u5982\u4e09\u6001\u95e8\u7535\u8def\u4e09\u6781\u7ba1\u7684\u96c6\u7535\u6781\uff0c\u6216\u4e8c\u6781\u7ba1\u6b63\u6781\u53bb\u63a7\u5236\u628a\u4e0a\u62c9\u7535\u963b\u7684\u7535\u6d41\u62c9\u4e0b\u6765\u6210\u4e3a\u4f4e\u7535\u5e73\u3002\u53cd\u4e4b\uff0c
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------------------------------------------
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--------------------
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--------------------
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--------------------
1\u3002\u4fe1\u53f7\u9700\u8981\u5916\u90e8\u7684\u7535\u6e90\u6765\u63d0\u4f9b\u9ad8\u4f4e\u7535\u5e73\u65f6\uff0c\u9700\u8981\u52a0\u4e0a\u62c9\u6216\u4e0b\u62c9\u7535\u963b;
2\u3002\u867d\u7136\u7cfb\u7edf\u80fd\u63d0\u4f9b\u76f8\u5e94\u7684\u7535\u5e73\uff0c\u4f46\u662f\u5728\u4e0d\u5de5\u4f5c\u7684\u72b6\u6001\u4e0b\uff0c\u4fe1\u53f7\u7684\u72b6\u6001\u5982\u679c\u9700\u8981\u4e3a\u9ad8\u6216\u4f4e\u65f6\uff0c\u9700\u8981\u52a0\u4e0a\u62c9\u6216\u4e0b\u62c9;
3\u3002IC\u7684\u8f93\u51fa\u4e3aOpen-Drain\u65f6\uff0c\u9700\u8981\u5916\u52a0\u4e0a\u62c9\u7535\u963b\u3002
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--------------------
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1\u3002\u9a71\u52a8\u5668\u4ef6\u8f93\u5165\u7535\u6d41\u7684\u5927\u5c0f\uff0c\u9700\u8981\u5728\u4f7f\u7528\u4e0a\u62c9\u65f6\u8003\u8651\u3002\u89e3\u51b3\u7684\u662f\u9ad8\u7535\u5e73\u7684\u5339\u914d\u3002
2\u3002\u7535\u8def\u901f\u5ea6\u7684\u5927\u5c0f\u3002\u5982\u679c\u4f20\u9001\u7684\u6570\u5b57\u4fe1\u606f\u901f\u5ea6\u8f83\u9ad8\uff0c\u5c31\u8981\u6ce8\u610f\u9a8c\u8bc1\u7ebf\u8def\u7684\u5ef6\u8fdf\u6709\u6ca1\u6709\u8d70\u51fa\u4fe1\u606f\u7684\u8f6c\u6298\u9891\u7387\u3002
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--------------------
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--------------------
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--------------------
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------------------------------------------
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----
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----
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----------------------
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--------------------------------------------------
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---------------------------------------
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3\u3001\u4e09\u6001\u95e8\uff08ST\u95e8\uff09\u4e3b\u8981\u7528\u5728\u5e94\u7528\u4e8e\u591a\u4e2a\u95e8\u8f93\u51fa\u5171\u4eab\u6570\u636e\u603b\u7ebf\uff0c\u4e3a\u907f\u514d\u591a\u4e2a\u95e8\u8f93\u51fa\u540c\u65f6\u5360\u7528\u6570\u636e\u603b\u7ebf\uff0c\u8fd9\u4e9b\u95e8\u7684\u4f7f\u80fd\u4fe1\u53f7\uff08EN\uff09\u4e2d\u53ea\u5141\u8bb8\u6709\u4e00\u4e2a\u4e3a\u6709\u6548\u7535\u5e73\uff08\u5982\u9ad8\u7535\u5e73\uff09\uff0c\u7531\u4e8e\u4e09\u6001\u95e8\u7684\u8f93\u51fa\u662f\u63a8\u62c9\u5f0f\u7684\u4f4e\u963b\u8f93\u51fa\uff0c\u4e14\u4e0d\u9700\u63a5\u4e0a\u62c9\uff08\u8d1f\u8f7d\uff09\u7535\u963b\uff0c\u6240\u4ee5\u5f00\u5173\u901f\u5ea6\u6bd4OC\u95e8\u5feb\uff0c\u5e38\u7528\u4e09\u6001\u95e8\u4f5c\u4e3a\u8f93\u51fa\u7f13\u51b2\u5668\u3002
STC89C52单片机的IO口没有方向寄存器，和标准的89C51一样，P0口为漏极开路结构，P1、P2、P3口为内部上拉，由于内部上拉电流并不大，允许外部将其拉低，因此作为输入状态时，可以先将其赋值为高，然后外部下拉，再读数据。
比如你想让P1.0为1，那就直接赋值
P1=0x01;
而读取P1.0状态的时候，也是类似，无需其他操作：
if(P1==0x01)
……
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绛旓細STC89C52鍗曠墖鏈 绔彛 鐨 鏈澶х數娴 涓 8 ~ 12 mA锛岃繖涓 8 ~12 mA 鏄寚 寰 IO 鍙 鐏屽叆鐢垫祦锛岃緭鍑虹數娴 鍙湁 100 ~ 200 uA銆傚 鎺 涓涓 500娆у鍒 GND, 鍒 500 * 0.2 mA = 250 mV 涔熷氨鎺ヨ繎 0 V 浜嗐傚鏋滈渶瑕佹彁楂 杈撳嚭鐢垫祦鑳藉姏锛屽垯闇瑕佸姞 涓婃媺鐢甸樆锛屽嵆 VCC - 鐢甸樆 - IO ...
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