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單片機C51中c語言函數(-nop-())求助

extern void _nop_ (void); //空操作,相當於8051的NOP指令

extern bit _testbit_ (bit); //測試並清零位,相當於8051的JBC指令

extern unsigned char _cror_ (unsigned char, unsigned char); //字符循環右移

extern unsigned int _iror_ (unsigned int, unsigned char); //整數循環右移

extern unsigned long _lror_ (unsigned long, unsigned char); //長整數循環右移

extern unsigned char _crol_ (unsigned char, unsigned char); //字符循環左移

extern unsigned int _irol_ (unsigned int, unsigned char); //整數循環左移

extern unsigned long _lrol_ (unsigned long, unsigned char); //長整數循環左移

extern unsigned char _chkfloat_(float); //測試並返回源點數狀態

看妳的要求~~