详尽的51单片机教程,第4章,附有注解初学者最好的参考

				A51 MACRO ASSEMBLER  KEY_FUNCTION                                                         06/30/2006 17:05:07 PAGE     1
				
				
				MACRO ASSEMBLER A51 V8.00
				OBJECT MODULE PLACED IN Key Function.OBJ
				ASSEMBLER INVOKED BY: E:\Keil\C51\BIN\A51.EXE Key Function.asm SET(SMALL) DEBUG EP
				
				LOC  OBJ            LINE     SOURCE
				
				0000                   1                     ORG             00H
				0000 74EE              2     START:  MOV             A,#0EEH
				0002 7590FF            3                     MOV             P1,#0FFH
				0005 20B7FD            4     K1:             JB              P3.7,$
				0008 7C01              5                     MOV             R4,#1H
				000A 120026            6                     LCALL   DELAY
				000D 20B7F5            7                     JB              P3.7,K1
				                       8                     
				                       9                     
				                      10                     
				0010 F590             11     S1:             MOV             P1,A
				0012 7C0A             12                     MOV             R4,#10
				0014 120026           13                     LCALL   DELAY
				0017 7590FF           14                     MOV             P1,#0FFH
				001A 7C0A             15                     MOV             R4,#10
				001C 120026           16                     LCALL   DELAY
				                      17     
				001F 30B7EE           18                     JNB             P3.7,S1
				                      19     
				0022 23               20                     RL              A
				                      21                                     
				0023 020005           22                     LJMP    K1              
				0026 7D14             23     DELAY:  MOV             R5,#20
				0028 7EFA             24     D1:             MOV             R6,#250
				002A DEFE             25                     DJNZ    R6,$
				002C DDFA             26                     DJNZ    R5,D1
				002E DCF6             27                     DJNZ    R4,DELAY
				0030 22               28                     RET
				                      29                     END
				A51 MACRO ASSEMBLER  KEY_FUNCTION                                                         06/30/2006 17:05:07 PAGE     2
				
				SYMBOL TABLE LISTING
				------ ----- -------
				
				
				N A M E             T Y P E  V A L U E   ATTRIBUTES
				
				D1 . . . . . . . .  C ADDR   0028H   A   
				DELAY. . . . . . .  C ADDR   0026H   A   
				K1 . . . . . . . .  C ADDR   0005H   A   
				P1 . . . . . . . .  D ADDR   0090H   A   
				P3 . . . . . . . .  D ADDR   00B0H   A   
				S1 . . . . . . . .  C ADDR   0010H   A   
				START. . . . . . .  C ADDR   0000H   A   
				
				
				REGISTER BANK(S) USED: 0 
				
								ASSEMBLY COMPLETE.  0 WARNING(S), 0 ERROR(S)