ex5-8.lst

《单片机原理实用教程——基于Proteus虚拟仿真》一书的配套光盘


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:	EX5-8.ASM
	Object File:	EX5-8.HEX
	List File:	EX5-8.LST



 Line  I  Addr  Code            Source

    1:		N      0000		ORG 0000H         ;复位地址
    2:	  0000	02 00 30	   	LJMP MAIN         ;跳转到主程序
    3:		N      0030	ORG	0030H             ;主程序入口地址
    4:	  0030	75 89 06	MAIN:	MOV  TMOD,#06H    ;写入T0控制字, 8位外部计数方式
    5:	  0033	75 8C FF		MOV  TH0,#0FFH    ;写入T0计数初值
    6:	  0036	75 8A FF		MOV  TL0,#0FFH
    7:	  0039	D2 8C			SETB TR0          ;启动T0计数
    8:	  003B	10 8D 02	LOOP1:  JBC  TF0,PTFO1    ;查询T0溢出标志
    9:	  003E	80 FB			SJMP LOOP1
   10:	  0040	C2 8C		PTFO1:  CLR  TR0           ;停止计数
   11:	  0042	75 89 02		MOV  TMOD,#02H     ;改变T为8位定时方式
   12:	  0045	75 8C 06		MOV  TH0,#06H      ;写入T0定时初值
   13:	  0048	75 8A 06		MOV  TL0,#06H
   14:	  004B	C2 90			CLR  P1.0          ;P1.0输出低电平
   15:	  004D	D2 8C			SETB TR0           ;启动T0定时500μs
   16:	  004F	10 8D 02	LOOP2:  JBC  TF0,PTFO2     ;查询T0溢出标志
   17:	  0052	80 FB			SJMP LOOP2
   18:	  0054	D2 90		PTFO2:  SETB P1.0          ;P1.0输出高电平
   19:	  0056	C2 8C			CLR  TR0           ;停止计数
   20:	  0058	80 D6			SJMP MAIN
   21:					END
   22:





                     register banks used:  ---

                     no errors



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





	       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
CY				  BIT	      D7
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
IE				  DATA	      A8
IE0				  BIT	      89
IE1				  BIT	      8B
INT0				  BIT	      B2
INT1				  BIT	      B3
IP				  DATA	      B8
IT0				  BIT	      88
IT1				  BIT	      8A
LOOP1				  CODE	    003B	   8
LOOP2				  CODE	    004F	  16
MAIN				  CODE	    0030	   4
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
PTFO1				  CODE	    0040	  10
PTFO2				  CODE	    0054	  18
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
SBUF				  DATA	      99

ASEM-51 V1.2                                         Copyright (c) 1996 by W.W. Heinz                                         PAGE 3



SYMBOL				  TYPE     VALUE	LINE
------------------------------------------------------------
SCON				  DATA	      98
SINT				  CODE	    0023
SM0				  BIT	      9F
SM1				  BIT	      9E
SM2				  BIT	      9D
SP				  DATA	      81
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
TXD				  BIT	      B1
WR				  BIT	      B6