main.c

at89c51单片机i/0控制实验源代码

#include "AT89C51SND1_REG.H"

#define LED	     P3_5

void delay(unsigned char k)
{unsigned int i;
 unsigned char j;
 for(j=0;j<k;j++)
 	for(i=0;i< 5000;i++);
}
 
main()
{
while(1)
	{
	 LED = 0;
	 delay(1);
	 LED = 1;
	 delay(15);
	 LED = 0; 
	 delay(1) ;
	 LED = 1;
	 delay(50);
	} 
}