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extern void_nop_(void);//空操作，相当于8051的NOP指令
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

关键词： C51INTRINS