51中_nop_();是什么意思
3个回答
展开全部
在<intrins.h>文件中有定义，下面是具体介绍
_nop_
Summary #include <intrins.h>
void _nop_ (void);
Description The _nop_ routine inserts a NOP instruction into the program. This routine can be used to pause for 1 CPU cycle. This routine is implemented as an intrinsic function. The NOP instruction is included inline.
Return Value None.
Example
#include <intrins.h>
void test_nop (void) {
P1 = 0xFF;
_nop_ (); /* delay for hardware */
_nop_ ();
_nop_ ();
P1 = 0x00;
}
_nop_
Summary #include <intrins.h>
void _nop_ (void);
Description The _nop_ routine inserts a NOP instruction into the program. This routine can be used to pause for 1 CPU cycle. This routine is implemented as an intrinsic function. The NOP instruction is included inline.
Return Value None.
Example
#include <intrins.h>
void test_nop (void) {
P1 = 0xFF;
_nop_ (); /* delay for hardware */
_nop_ ();
_nop_ ();
P1 = 0x00;
}
本回答被网友采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
展开全部
延迟一个时钟周期
已赞过
已踩过<
你对这个回答的评价是？
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
