单片机C51中c语言函数（-nop-()）求助 51单片机 c语言里 _nop_ 函数怎么用 具体一点 求高...
\u5404\u4f4d\u52c7\u58eb\u4eec\uff01\u572851\u5355\u7247\u673a\u7528C\u8bed\u8a00\u7f16\u7a0b\u65f6\uff0c\u5728\u51fd\u6570\u4f53\u5185\u5d4c\u5957\u6709\u201c-nop-( )"\u8fd9\u4e2a\u662f\u8d77\u4ec0\u4e48\u4f5c\u7528\u7684\uff1f\u8fd9\u662f\u7a7a\u64cd\u4f5c\uff0c\u4e3b\u8981\u662f\u5728\u8fd9\u4e2a\u5730\u65b9\u8981\u5ef6\u65f6\u4e00\u56de \u5360\u7528\u4e00\u4e2a\u6307\u4ee4\u5468\u671f \u4e0e\u65f6\u949f\u9891\u7387\u6709\u5173
\u5728\u5355\u7247\u673ac\u8bed\u8a00\u4e2d\u76f4\u63a5\u8c03\u7528\u5e93\u51fd\u6570\u5373\u53ef\uff0c\u5177\u4f53\u5982\u4e0b\uff1a
#include // \u58f0\u660e\u4e86void _nop_(void);
_nop_(); // \u4ea7\u751f\u4e00\u6761NOP\u6307\u4ee4\u3002
\u8be5\u51fd\u6570\u7684\u4f5c\u7528\uff1a\u5bf9\u4e8e\u5ef6\u65f6\u5f88\u77ed\u7684\uff0c\u8981\u6c42\u5728us\u7ea7\u7684\uff0c\u91c7\u7528\u201c_nop_\u201d\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u76f8\u5f53\u6c47\u7f16NOP\u6307\u4ee4\uff0c\u5ef6\u65f6\u51e0\u5fae\u79d2\u3002NOP\u6307\u4ee4\u4e3a\u5355\u5468\u671f\u6307\u4ee4\uff0c\u53ef\u7531\u6676\u632f\u9891\u7387\u7b97\u51fa\u5ef6\u65f6\u65f6\u95f4\uff0c\u5bf9\u4e8e12M\u6676\u632f\uff0c\u5ef6\u65f61uS\u3002
\u5355\u7247\u673a\u53c8\u79f0\u5355\u7247\u5fae\u63a7\u5236\u5668,\u5b83\u4e0d\u662f\u5b8c\u6210\u67d0\u4e00\u4e2a\u903b\u8f91\u529f\u80fd\u7684\u82af\u7247,\u800c\u662f\u628a\u4e00\u4e2a\u8ba1\u7b97\u673a\u7cfb\u7edf\u96c6\u6210\u5230\u4e00\u4e2a\u82af\u7247\u4e0a\u3002\u76f8\u5f53\u4e8e\u4e00\u4e2a\u5fae\u578b\u7684\u8ba1\u7b97\u673a\uff0c\u548c\u8ba1\u7b97\u673a\u76f8\u6bd4\uff0c\u5355\u7247\u673a\u53ea\u7f3a\u5c11\u4e86I/O\u8bbe\u5907\u3002\u6982\u62ec\u7684\u8bb2\uff1a\u4e00\u5757\u82af\u7247\u5c31\u6210\u4e86\u4e00\u53f0\u8ba1\u7b97\u673a\u3002\u5b83\u7684\u4f53\u79ef\u5c0f\u3001\u8d28\u91cf\u8f7b\u3001\u4ef7\u683c\u4fbf\u5b9c\u3001\u4e3a\u5b66\u4e60\u3001\u5e94\u7528\u548c\u5f00\u53d1\u63d0\u4f9b\u4e86\u4fbf\u5229\u6761\u4ef6\u3002\u540c\u65f6\uff0c\u5b66\u4e60\u4f7f\u7528\u5355\u7247\u673a\u662f\u4e86\u89e3\u8ba1\u7b97\u673a\u539f\u7406\u4e0e\u7ed3\u6784\u7684\u6700\u4f73\u9009\u62e9\u3002
\u5355\u7247\u673a\u7684\u4f7f\u7528\u9886\u57df\u5df2\u5341\u5206\u5e7f\u6cdb\uff0c\u5982\u667a\u80fd\u4eea\u8868\u3001\u5b9e\u65f6\u5de5\u63a7\u3001\u901a\u8baf\u8bbe\u5907\u3001\u5bfc\u822a\u7cfb\u7edf\u3001\u5bb6\u7528\u7535\u5668\u7b49\u3002\u5404\u79cd\u4ea7\u54c1\u4e00\u65e6\u7528\u4e0a\u4e86\u5355\u7247\u673a\uff0c\u5c31\u80fd\u8d77\u5230\u4f7f\u4ea7\u54c1\u5347\u7ea7\u6362\u4ee3\u7684\u529f\u6548\uff0c\u5e38\u5728\u4ea7\u54c1\u540d\u79f0\u524d\u51a0\u4ee5\u5f62\u5bb9\u8bcd\u2014\u2014\u201c\u667a\u80fd\u578b\u201d\uff0c\u5982\u667a\u80fd\u578b\u6d17\u8863\u673a\u7b49\u3002
extern bit _testbit_ (bit); //测试并清零位，相当于8051的JBC指令
extern unsigned char _cror_ (unsigned char, unsigned char); //字符循环右移
extern unsigned int _iror_ (unsigned int, unsigned char); //整数循环右移
extern unsigned long _lror_ (unsigned long, unsigned char); //长整数循环右移
extern unsigned char _crol_ (unsigned char, unsigned char); //字符循环左移
extern unsigned int _irol_ (unsigned int, unsigned char); //整数循环左移
extern unsigned long _lrol_ (unsigned long, unsigned char); //长整数循环左移
extern unsigned char _chkfloat_(float); //测试并返回源点数状态
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