秒钟0.lst

单片机串口实验的原程序 其简要的概括了程序的手写规范 对单片机初学者来说是很有意义的哟

8051 Assembler           Version 1.00   12/30/101 05:35:15    Page 1
H:\89s52编程器实验板\ASM程序初级\秒钟0\秒钟0.a51



    1 0000                     ORG     0000H
    2 0000 020030       BEGIN:  LJMP INIT
    3 0003                     ORG     0003H   ;INT0
    4 0003 32                  RETI
    5 000B                     ORG     000BH   ;T0 INT
    6 000B 0200CE       T0:    LJMP    T0INTSR
    7 000E 32                  RETI
    8 0013                     ORG     0013H   ;1NT1
    9 0013 32                  RETI
   10 001B                     ORG     001BH   ;T1 INT
   11 001B 32                  RETI
   12 0023                     ORG     0023H   ;S PORT INT
   13 0023 32                  RETI
   14 002B                     ORG     002BH   ;T2 INT
   15 002B 32                  RETI
   16 0030                     ORG     0030H
   17 0030              ;=====================================================
   18 0030              ;8032 RAM 00H--FFH CLEAR 0
   19 0030              INIT: 
   20 0030 78FF                MOV     R0,#0FFH
   21 0032 7400                MOV     A, #00H
   22 0034              CLE0FFH:
   23 0034 F6                  MOV     @R0,A
   24 0035 D8FD                DJNZ    R0,CLE0FFH
   25 0037              
   26 0037              ;SET STACK AREA  70H--7FH
   27 0037 758170              MOV     SP,#70H
   28 003A              ;TIMER INIT
   29 003A 758901              MOV     TMOD,#01H
   30 003D 758AFC              MOV     TL0,#0FCH       ;2 E+16 = 65536 = 55536 + 10000(0.05S)
   31 0040 758CD8              MOV     TH0,#0D8H       ;D8F0H=55536
   32 0043              ;ENABLE INTERRUPT
   33 0043 D2AF                SETB    EA
   34 0045 D2A9                SETB    ET0
   35 0047              ;START UP T0
   36 0047 D28C                SETB    TR0
   37 0049              ;SYSTEM NORMAL ,IDENTIFIER "0.0"
   38 0049 75D000              MOV     PSW,#00H
   39 004C              ;====================================================================
   40 004C 00           ENTRK1: NOP
   41 004D 120055              LCALL   TICHANG;DISPLAY CHARACTER CHANGE
   42 0050 120068              LCALL   DISPLAY;DISPLAY SUBRUTIN
   43 0053 80F7                SJMP    ENTRK1
   44 0055              ;====================================================================
   45 0055              ;       2. TICHANG......TIME DATA CHARACTER CHANGE
   46 0055              ;       4. DISPLAY......DISPLAY SUBRUTIN
   47 0055              ;       6. DELAY60......DELAY 60mS
   48 0055              ;       7. DCCHANG......DISPLAY CHARACTER CHANGE
   49 0055              ;--------------------------------------------------------------------
   50 0055              ;2.------------------------------------------------------------------
   51 0055              ;TICHANG
   52 0055              ;      TIME DATA CHARACTER CHANGE
   53 0055              ;       2. RAM BIT 00H --PRESS TIMESET KEY FLAG     1=PRESSED, 0=NOT
   54 0055              ;
   55 0055              ;--------------------------------------------------------------------
   56 0055 00           TICHANG:NOP
   57 0056 7F04                MOV     R7,#4
8051 Assembler           Version 1.00   12/30/101 05:35:15    Page 2
H:\89s52编程器实验板\ASM程序初级\秒钟0\秒钟0.a51



   58 0058 786F                MOV     R0,#6FH
   59 005A 7933                MOV     R1,#33H
   60 005C E7           TCHANG0:MOV    A,@R1
   61 005D 1200B7              LCALL   DCCHANG         ;DISPLAY CHARACTER CHANGE
   62 0060 F4                  CPL     A
   63 0061 F6                  MOV     @R0,A
   64 0062 18                  DEC     R0
   65 0063 19                  DEC     R1
   66 0064 DFF6                DJNZ    R7,TCHANG0
   67 0066 00           TICHOUT:NOP
   68 0067 22                  RET
   69 0068              ;--------------------------------------------------------------------
   70 0068              
   71 0068              ;4.------------------------------------------------------------------
   72 0068              ;DISPLAY:
   73 0068              ;       DISPLAY SUBRUTIN
   74 0068              ;
   75 0068              ;   RAM:6FH    CLOCK HORE 10 BIT
   76 0068              ;       6EH     CLOCK HORE  1 BIT
   77 0068              ;      6DH     CLOCK MIN  10 BIT
   78 0068              ;      6CH     CLOCK MIN   1 BIT
   79 0068              ;
   80 0068              ;--------------------------------------------------------------------
   81 0068 00           DISPLAY:NOP
   82 0069              ;       CLR     P1.3
   83 0069 D293                SETB     P1.3
   84 006B 856F80              MOV     P0,6FH
   85 006E              ;       SETB    P1.0
   86 006E C290                CLR     P1.0
   87 0070 1200A7              LCALL   DELAY60         ;DELAY 60MS
   88 0073 1200A7              LCALL   DELAY60         ;DELAY 60MS
   89 0076              ;       CLR     P1.0
   90 0076 D290                SETB    P1.0
   91 0078              
   92 0078 856E80              MOV     P0,6EH
   93 007B              ;       SETB    P1.1
   94 007B C291                CLR     P1.1
   95 007D 1200A7              LCALL   DELAY60         ;DELAY 60MS
   96 0080 1200A7              LCALL   DELAY60         ;DELAY 60mS
   97 0083              ;       CLR     P1.1
   98 0083 D291                SETB    P1.1
   99 0085              
  100 0085 856D80              MOV     P0,6DH
  101 0088              ;       SETB    P1.2
  102 0088 C292                CLR     P1.2
  103 008A 1200A7              LCALL   DELAY60         ;DELAY 60MS
  104 008D 1200A7              LCALL   DELAY60         ;DELAY 60MS
  105 0090              ;       CLR     P1.2
  106 0090 D292                SETB    P1.2
  107 0092              
  108 0092 856C80              MOV     P0,6CH
  109 0095              ;       SETB    P1.3
  110 0095 C293                CLR     P1.3
  111 0097 1200A7              LCALL   DELAY60         ;DELAY 60MS
  112 009A 1200A7              LCALL   DELAY60         ;DELAY 60MS
  113 009D D294                SETB    P1.4
  114 009F D297                SETB    P1.7
8051 Assembler           Version 1.00   12/30/101 05:35:15    Page 3
H:\89s52编程器实验板\ASM程序初级\秒钟0\秒钟0.a51



  115 00A1 D296                SETB    P1.6
  116 00A3 D295                SETB    P1.5
  117 00A5 22                  RET
  118 00A6              ;--------------------------------------------------------------------
  119 00A6              
  120 00A6              
  121 00A6 22                  RET
  122 00A7              ;--------------------------------------------------------------------
  123 00A7              ;6.------------------------------------------------------------------
  124 00A7              ;DELAY60:
  125 00A7              ;      DELAY 100mS FOR NEXT RANGING
  126 00A7              
  127 00A7              ;--------------------------------------------------------------------
  128 00A7 C0D0         DELAY60:PUSH    PSW
  129 00A9 75D000              MOV     PSW,#00H
  130 00AC 7B06                MOV     R3,#6            ;#10          0.5ms * 10 = 5ms 1997-9-3
  131 00AE 7CFA         W60MS: MOV     R4,#0FAH         ;0FAH =250
  132 00B0 DCFE         W500US1:DJNZ    R4,W500US1       ;TIME = 2US   2 US * 250 = 0.5 MS