A51 MACRO ASSEMBLER  ELECTRONIC_ORGAN                                                     08/26/2008 17:28:14 PAGE     1


MACRO ASSEMBLER A51 V8.00
OBJECT MODULE PLACED IN Electronic Organ.OBJ
ASSEMBLER INVOKED BY: D:\Keil\C51\BIN\A51.EXE Electronic Organ.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

  0030                 1     LINE    EQU             30H
  0031                 2     ROW             EQU             31H
  0032                 3     VAL             EQU             32H
0000                   4                     ORG             00H
0000 800C              5                     SJMP    START
000B                   6                     ORG             0BH
000B 0200B7            7                     LJMP    INT_T0
000E 758000            8     START:  MOV             P0,#00H
0011 758901            9                     MOV             TMOD,#01H
                      10     ;******************************************
                      11     ;按鍵掃描程序
                      12     ;******************************************
0014 75B0F0           13     LSCAN:  MOV             P3,#0F0H        
0017 30B00C           14     L1:             JNB             P3.0,L2
001A 1200CC           15                     LCALL   DELAY
001D 30B006           16                     JNB             P3.0,L2
0020 753000           17                     MOV             LINE,#00H
0023 020050           18                     LJMP    RSCAN
0026 30B10C           19     L2:             JNB             P3.1,L3
0029 1200CC           20                     LCALL   DELAY
002C 30B106           21                     JNB             P3.1,L3
002F 753001           22                     MOV             LINE,#01H
0032 020050           23                     LJMP    RSCAN
0035 30B20C           24     L3:             JNB             P3.2,L4
0038 1200CC           25                     LCALL   DELAY
003B 30B206           26                     JNB             P3.2,L4
003E 753002           27                     MOV             LINE,#02H
0041 020050           28                     LJMP    RSCAN
0044 30B3D0           29     L4:             JNB             P3.3,L1
0047 1200CC           30                     LCALL   DELAY
004A 30B3CA           31                     JNB             P3.3,L1
004D 753003           32                     MOV             LINE,#03H
                      33     
0050 75B00F           34     RSCAN:  MOV             P3,#0FH
0053 30B406           35     C1:             JNB             P3.4,C2
0056 753100           36                     MOV             ROW,#00H
0059 020074           37                     LJMP    CALCU
005C 30B506           38     C2:             JNB             P3.5,C3
005F 753101           39                     MOV             ROW,#01H
0062 020074           40                     LJMP    CALCU
0065 30B606           41     C3:             JNB             P3.6,C4
0068 753102           42                     MOV             ROW,#02H
006B 020074           43                     LJMP    CALCU
006E 30B7E2           44     C4:             JNB             P3.7,C1
0071 753103           45                     MOV             ROW,#03H                
                      46     
0074 E530             47     CALCU:  MOV             A,LINE                  ;計算鍵號
0076 75F004           48                     MOV             B,#04H
0079 A4               49                     MUL             AB
007A 2531             50                     ADD             A,ROW
007C F532             51                     MOV             VAL,A
                      52     ;*******************************************
                      53     ;根據(jù)鍵號查表得到定時器的定時常