key.lst

通信基带信号发生器的设计

A51 MACRO ASSEMBLER  KEY                                                                  09/25/2007 10:04:28 PAGE     1


MACRO ASSEMBLER A51 V7.07
OBJECT MODULE PLACED IN F:\INTEGRATED_DESIGN\MCU_FPGA\KEY.OBJ
ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE F:\INTEGRATED_DESIGN\MCU_FPGA\KEY.ASM DB SB

LOC  OBJ            LINE     SOURCE

                       1       ;-----------键盘扫描相关-----------
  0030                 2             KEYH  EQU 30H          ;待扫描行线
  0031                 3             KEYL  EQU 31H          ;待扫描列线
  0032                 4             KEYZ  EQU 32H          ;按键值
  0033                 5             KEYN  EQU 33H          ;指示待扫描行
                       6     
0000                   7             ORG 0000H
0000 803E              8             SJMP START
0040                   9             ORG 0040H
0040 758168           10     START:  MOV SP,#68H           ;主程序入口
0043 7590F0           11     KEY1: MOV P1,#0F0H          ;行线为P0-P3,列线为P4-P7
0046 E590             12           MOV A,P1
0048 440F             13           ORL A,#0FH
004A F4               14           CPL A
004B 7002             15           JNZ IN
004D 80F4             16           SJMP KEY1
                      17     
004F 1180             18     IN:   ACALL DELAY
0051 753004           19           MOV KEYH,#04H
0054 75337F           20           MOV KEYN,#07FH    ;做指针,指示待扫描行
0057 753200           21           MOV KEYZ,#0
005A E533             22     SCAN: MOV A,KEYN
005C 23               23           RL A
005D F533             24           MOV KEYN,A
005F F590             25           MOV P1,A          ;逐行扫描,被扫描行送低
0061 E590             26           MOV A,P1          ;读列线电平值
0063 C4               27           SWAP A
0064 753104           28           MOV KEYL,#04H
0067 13               29     KEY2: RRC  A
0068 500A             30           JNC FIND          ;C位不为1转
006A 0532             31           INC KEYZ
006C D531F8           32           DJNZ KEYL,KEY2
006F D530E8           33           DJNZ KEYH,SCAN
0072 800A             34           SJMP KEY3
                      35     
0074 7590F0           36     FIND:  MOV P1,#0F0H
0077 E590             37     LOOSEN:MOV A,P1
0079 440F             38            ORL A,#0FH
007B F4               39            CPL A
007C 70F9             40            JNZ LOOSEN
                      41     
007E 80C0             42     KEY3:  SJMP START
                      43            
                      44     ;**************************键盘20MS延时**************************************
0080 7E15             45     DELAY:MOV R6,#15H
0082 7F18             46     DL2:  MOV R7,#18H
0084 00               47     DL1:  NOP
0085 00               48           NOP
0086 DFFC             49           DJNZ R7,DL1
0088 DEF8             50           DJNZ R6,DL2
008A 22               51           RET       
                      52     
                      53            END
A51 MACRO ASSEMBLER  KEY                                                                  09/25/2007 10:04:28 PAGE     2

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


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

DELAY. . . . . . .  C ADDR   0080H   A   
DL1. . . . . . . .  C ADDR   0084H   A   
DL2. . . . . . . .  C ADDR   0082H   A   
FIND . . . . . . .  C ADDR   0074H   A   
IN . . . . . . . .  C ADDR   004FH   A   
KEY1 . . . . . . .  C ADDR   0043H   A   
KEY2 . . . . . . .  C ADDR   0067H   A   
KEY3 . . . . . . .  C ADDR   007EH   A   
KEYH . . . . . . .  N NUMB   0030H   A   
KEYL . . . . . . .  N NUMB   0031H   A   
KEYN . . . . . . .  N NUMB   0033H   A   
KEYZ . . . . . . .  N NUMB   0032H   A   
LOOSEN . . . . . .  C ADDR   0077H   A   
P1 . . . . . . . .  D ADDR   0090H   A   
SCAN . . . . . . .  C ADDR   005AH   A   
SP . . . . . . . .  D ADDR   0081H   A   
START. . . . . . .  C ADDR   0040H   A   


REGISTER BANK(S) USED: 0 


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