微處理

#include <AT89X51.h>
main()
{
	  int  i;
	  while(1)
	  {
			P0_0=1,P0_2=1,P0_4=1,P0_6=1;
			P0_1=0,P0_3=0,P0_5=0,P0_7=0;
			for(i=1;i<20000;i++);
			P0_0=0,P0_2=0,P0_4=0,P0_6=0;
			P0_1=1,P0_3=1,P0_5=1,P0_7=1;
			for(i=1;i<20000;i++);
	  }
}