A51 MACRO ASSEMBLER  AKEY_S                                                               09/06/2003 18:27:24 PAGE     1


MACRO ASSEMBLER A51 V7.07
OBJECT MODULE PLACED IN akey_s.OBJ
ASSEMBLER INVOKED BY: C:\KEIL\C51\BIN\A51.EXE akey_s.asm SET(LARGE) DEBUG EP

LOC  OBJ            LINE     SOURCE

                       1     ;參數(shù)定義                                                               
  0060                 2     SPBM    DATA    60H                             
  0092                 3     KDKEY   BIT     P1.2    ;定義鍵盤檢測位
  0090                 4     FRIT    EQU     P1      ;定義P1口
                       5     ;程序開始       
4000                   6             ORG     4000H                   
4000 024100            7             LJMP    MAIN                    
                       8                                                                     
4100                   9             ORG     4100H   ;程序從4100H單元開始存放
4100 758160           10     MAIN:   MOV     SP,#SPBM;給堆棧指針賦初值
                      11             
4103                  12     KEY1:   
4103 3107             13             ACALL   KEY     ;調(diào)KEY子程序
                      14             
4105 2103             15             AJMP    KEY1    ;繼續(xù)
                      16     
4107                  17     KEY:    
4107 C0D0             18             PUSH    PSW
4109 C0E0             19             PUSH    ACC                             
410B 79FF             20     KEYREP: MOV     R1,#0FFH;賦初值
410D 7400             21             MOV     A,#00H
410F 3135             22             ACALL   TXDBYTE
4111 2092F7           23             JB      KDKEY,KEYREP
4114 3149             24             ACALL   DELAY
4116 7900             25             MOV     R1,#00H                 
4118 74FE             26             MOV     A,#0FEH ;是，則判斷其鍵值
411A                  27     KEYZHI: 
411A C297             28             CLR     P1.7
411C 3149             29             ACALL   DELAY
411E D297             30             SETB    P1.7
4120 C297             31             CLR     P1.7
4122 3149             32             ACALL   DELAY
4124 D297             33             SETB    P1.7
4126 3135             34             ACALL   TXDBYTE
4128 309205           35             JNB     KDKEY,KEYRET    ;是，則保存退出
412B 23               36             RL      A               ;否則檢測下一個鍵
412C 09               37             INC     R1
412D B47FEA           38             CJNE    A,#7FH,KEYZHI   ;檢測完了嗎？
4130                  39     KEYRET: 
4130 D0E0             40             POP     ACC
4132 D0D0             41             POP     PSW
4134 22               42             RET
                      43     
4135                  44     TXDBYTE:
4135 C0D0             45             PUSH     PSW
4137 C0E0             46             PUSH     ACC    
4139 7B08             47             MOV      R3,#08H
413B 33               48     TXDUP:  RLC      A      ;
413C 9290             49             MOV      P1.0,C
413E C291             50             CLR      P1.1
4140 D291             51             SETB     P1.1
4142 DBF7             52             DJNZ     R3,TXDUP
4144 D0E0             53             POP      ACC
4146 D0D0             54             POP      PSW
4148 22               55             RET                                             
                      56     
4149 7F10             57     DELAY:    MOV  R7,#10H
414B 7E10             58     DELAY0:   MOV  R6,#10H
A51 MACRO ASSEMBLER  AKEY_S                                                               09/06/2003 18:27:24 PAGE     2

414D DEFE             59     DELAY1:   DJNZ R6,DELAY1
414F DFFA             60               DJNZ R7,DELAY0
4151 22               61               RET   
                      62               END                                           
A51 MACRO ASSEMBLER  AKEY_S                                                               09/06/2003 18:27:24 PAGE     3

SYMBOL TABLE LISTING
------ ----- -------


N A M E             T Y P E  V A L U E   ATTRIBUTES

ACC. . . . . . . .  D ADDR   00E0H   A   
DELAY. . . . . . .  C ADDR   4149H   A   
DELAY0 . . . . . .  C ADDR   414BH   A   
DELAY1 . . . . . .  C ADDR   414DH   A   
FRIT . . . . . . .  D ADDR   0090H   A   
KDKEY. . . . . . .  B ADDR   0090H.2 A   
KEY. . . . . . . .  C ADDR   4107H   A   
KEY1 . . . . . . .  C ADDR   4103H   A   
KEYREP . . . . . .  C ADDR   410BH   A   
KEYRET . . . . . .  C ADDR   4130H   A   
KEYZHI . . . . . .  C ADDR   411AH   A   
MAIN . . . . . . .  C ADDR   4100H   A   
P1 . . . . . . . .  D ADDR   0090H   A   
PSW. . . . . . . .  D ADDR   00D0H   A   
SP . . . . . . . .  D ADDR   0081H   A   
SPBM . . . . . . .  D ADDR   0060H   A   
TXDBYTE. . . . . .  C ADDR   4135H   A   
TXDUP. . . . . . .  C ADDR   413BH   A   


REGISTER BANK(S) USED: 0 

ASSEMBLY COMPLETE.  0 WARNING(S), 0 ERROR(S)