p1口作输出.c

北航新c51单片机实验源代码

#include <reg51.h>
void delay() {
  unsigned int i;
  for (i=0; i<20000; i++) {}
}

void main() {
  unsigned char index;
  unsigned char LED;
  while (1) {
    LED = 1;
    for (index=0; index < 8; index++) {
      P1 = LED;
      LED <<= 1;
      delay();
    }
  }
}