io.lst

多个仿真例子


ASEM-51 V1.2                                         Copyright (c) 1996 by W.W. Heinz                                         PAGE 1





       MCS-51 Family Cross Assembler   A S E M - 5 1   V 1.2
       =====================================================



	Source File:	IO.ASM
	Object File:	IO.HEX
	List File:	IO.LST



 Line  I  Addr  Code            Source

    1:				;单片机每50ms从扩展的外部输入口读取开关的状态
    2:				;单片机将开关的状态以1Hz的闪动频率显示出来
    3:				;开关闭合时LED闪烁
    4:		N      8000	IO	EQU	8000H	;扩展的I/O口地址
    5:		N      0030	BUF	EQU	30H	;开关状态缓冲区
    6:		N	 00	FLASH	BIT	00H
    7:		N      0000		ORG	0
    8:	  0000	02 00 30		LJMP	START
    9:		N      000B		ORG	0BH
   10:	  000B	02 00 5B		LJMP	TS
   11:		N      0030		ORG	30H
   12:	  0030	75 81 60	START:	MOV	SP,#60H
   13:	  0033	75 89 01		MOV	TMOD,#1
   14:	  0036	75 8C 3C		MOV	TH0,#3CH
   15:	  0039	75 8D B0		MOV	TH1,#0B0H	;定时50ms
   16:	  003C	D2 A9			SETB	ET0
   17:	  003E	D2 AF			SETB	EA
   18:	  0040	7A 0A			MOV	R2,#10		;定时500ms计数
   19:	  0042	75 30 00		MOV	BUF,#0		;清开关状态缓冲区
   20:	  0045	C2 00			CLR	FLASH		;清闪烁标志
   21:	  0047	D2 8C			SETB	TR0
   22:	  0049	12 00 4E	LOOP:	LCALL	DISP		;显示开关状态
   23:	  004C	80 FB			SJMP	LOOP
   24:				;============================================
   25:				;显示程序
   26:				;功能：根据闪烁标志FLASH将开关缓冲区内容送显
   27:				;============================================
   28:	  004E	90 80 00	DISP:	MOV	DPTR,#IO
   29:	  0051	20 00 03		JB	FLASH,DISP1	;FLASH=1则将开关缓冲区内容送显
   30:	  0054	E4			CLR	A		;否则熄灭所有LED
   31:	  0055	F0			MOVX	@DPTR,A
   32:	  0056	22			RET
   33:	  0057	E5 30		DISP1:	MOV	A,BUF
   34:	  0059	F0			MOVX	@DPTR,A
   35:	  005A	22			RET
   36:				;============================================
   37:				;50ms中断服务程序
   38:				;功能：读取开关状态并存到开关缓冲区
   39:				;      每500ms将闪烁标志取反。
   40:				;============================================
   41:	  005B	C2 8C		TS:	CLR	TR0
   42:	  005D	75 8C 3C		MOV	TH0,#3CH
   43:	  0060	75 8A B0		MOV	TL0,#0B0H

ASEM-51 V1.2                                         Copyright (c) 1996 by W.W. Heinz                                         PAGE 2



 Line  I  Addr  Code            Source

   44:	  0063	D2 8C			SETB	TR0
   45:	  0065	90 80 00		MOV	DPTR,#IO
   46:	  0068	E0			MOVX	A,@DPTR		;读开关状态
   47:	  0069	F4			CPL	A
   48:	  006A	F5 30			MOV	BUF,A		;存开关状态
   49:	  006C	DA 04			DJNZ	R2,TS1
   50:	  006E	7A 0A			MOV	R2,#10
   51:	  0070	B2 00			CPL	FLASH
   52:	  0072	32		TS1:	RETI
   53:					END





                     register banks used:  ---

                     no errors




ASEM-51 V1.2                                         Copyright (c) 1996 by W.W. Heinz                                         PAGE 3





	       L I S T   O F   S Y M B O L S
	       =============================


SYMBOL				  TYPE     VALUE	LINE
------------------------------------------------------------
AC				  BIT	      D6
ACC				  DATA	      E0
B				  DATA	      F0
BUF				  NUMBER    0030	   5
CY				  BIT	      D7
DISP				  CODE	    004E	  28
DISP1				  CODE	    0057	  33
DPH				  DATA	      83
DPL				  DATA	      82
EA				  BIT	      AF
ES				  BIT	      AC
ET0				  BIT	      A9
ET1				  BIT	      AB
EX0				  BIT	      A8
EX1				  BIT	      AA
EXTI0				  CODE	    0003
EXTI1				  CODE	    0013
F0				  BIT	      D5
FLASH				  BIT	      00	   6
IE				  DATA	      A8
IE0				  BIT	      89
IE1				  BIT	      8B
INT0				  BIT	      B2
INT1				  BIT	      B3
IO				  NUMBER    8000	   4
IP				  DATA	      B8
IT0				  BIT	      88
IT1				  BIT	      8A
LOOP				  CODE	    0049	  22
OV				  BIT	      D2
P				  BIT	      D0
P0				  DATA	      80
P1				  DATA	      90
P2				  DATA	      A0
P3				  DATA	      B0
PCON				  DATA	      87
PS				  BIT	      BC
PSW				  DATA	      D0
PT0				  BIT	      B9
PT1				  BIT	      BB
PX0				  BIT	      B8
PX1				  BIT	      BA
RB8				  BIT	      9A
RD				  BIT	      B7
REN				  BIT	      9C
RESET				  CODE	    0000
RI				  BIT	      98
RS0				  BIT	      D3
RS1				  BIT	      D4
RXD				  BIT	      B0

ASEM-51 V1.2                                         Copyright (c) 1996 by W.W. Heinz                                         PAGE 4



SYMBOL				  TYPE     VALUE	LINE
------------------------------------------------------------
SBUF				  DATA	      99
SCON				  DATA	      98
SINT				  CODE	    0023
SM0				  BIT	      9F
SM1				  BIT	      9E
SM2				  BIT	      9D
SP				  DATA	      81
START				  CODE	    0030	  12
T0				  BIT	      B4
T1				  BIT	      B5
TB8				  BIT	      9B
TCON				  DATA	      88
TF0				  BIT	      8D
TF1				  BIT	      8F
TH0				  DATA	      8C
TH1				  DATA	      8D
TI				  BIT	      99
TIMER0				  CODE	    000B
TIMER1				  CODE	    001B
TL0				  DATA	      8A
TL1				  DATA	      8B
TMOD				  DATA	      89
TR0				  BIT	      8C
TR1				  BIT	      8E
TS				  CODE	    005B	  41
TS1				  CODE	    0072	  52
TXD				  BIT	      B1
WR				  BIT	      B6