51单片机编程

51单片机编程

intrins.h

intrins.h 库

案例:

#include <intrins.h>
void test_nop (void) {
  P1 = 0xFF;

  _nop_ (); /* delay for hardware */
  _nop_ ();
  _nop_ ();

  P1 = 0x00;
}

摘要:

#include <intrins.h>
unsigned char _crol_ (
  unsigned char c,        /* 要向左旋转的字符 */
  unsigned char b);       /* bit 要旋转的位置 */

案例:

#include <intrins.h>
void test_crol (void) {
  char a;
  char b;

  a = 0xA5;
  b = _crol_(a,3); /* b now is 0x2D */
}