间隔1S发光管循环闪烁

				C51 COMPILER V6.12  ____1S____LED                                                          03/21/2009 22:00:22 PAGE 1   
				
				
				C51 COMPILER V6.12, COMPILATION OF MODULE ____1S____LED
				OBJECT MODULE PLACED IN .\延时1S闪烁LED.OBJ
				COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE .\延时1S闪烁LED.c DEBUG OBJECTEXTEND
				
				stmt level    source
				
				   1          #include
				   2          #include 
				   3          #define uint unsigned int 
				   4          #define uchar unsigned char 
				   5          void del(uint);
				   6          void main()
				   7          {	
				   8   1      	uint sum=0xfe;
				   9   1      	while(1)
				  10   1      	{
				  11   2      		P1=sum;
				  12   2      		del(10);//延时1S，注意del中的y初值，这种无法精确定时，要精确定时可用定时器
				  13   2      		P1=0xff;
				  14   2      		del(10);
				  15   2      		P1=sum;
				  16   2      		del(10);
				  17   2      		P1=0xff;
				  18   2      		sum=_crol_(sum,2);
				  19   2      		del(10);	
				  20   2      	}
				  21   1      	
				  22   1      }
				  23          
				  24          void del(uint z)
				  25          {
				  26   1      	uint x,y;
				  27   1      	for(x=z;x>0;x--)
				  28   1      		for(y=12500;y>0;y--);
				  29   1      }
				
				
				MODULE INFORMATION:   STATIC OVERLAYABLE
				   CODE SIZE        =     79    ----
				   CONSTANT SIZE    =   ----    ----
				   XDATA SIZE       =   ----    ----
				   PDATA SIZE       =   ----    ----
				   DATA SIZE        =   ----       2
				   IDATA SIZE       =   ----    ----
				   BIT SIZE         =   ----    ----
				END OF MODULE INFORMATION.
				
				
				C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)