A51 MACRO ASSEMBLER  DEMOSTEP                                                             06/02/2006 15:17:40 PAGE     1


MACRO ASSEMBLER A51 V1.11
OBJECT MODULE PLACED IN DEMOSTEP.OBJ
ASSEMBLER INVOKED BY: C:\MANLEY\PMEDWIN\A51.EXE DEMOSTEP.ASM DB

LOC  OBJ            LINE     SOURCE

                       1         ;這是一個使用單片機通過NUL2003驅動步進電機程序.
                       2         ;步進電機: 5伏,500MA/STEP,四限四拍.
                       3         ;將步進電機的A B C D四個繞組連接到 S51E板"步進電機"的A,B,C,D,將公用抽頭并接在VCC上.
                       4         ;將"控制輸入口"的A B C D 接焊盤 P2.3,P2.2,P2.1,P2.0.
                       5         ;將P2.3-P2.0跳帽置焊盤位.
                       6         ;程序編制人:蔡祥榮 2004/06/20
                       7     
                       8       ;----------- IT'S FOR S51E --------------------------
  0021                 9         BUFF_STEP   EQU   21H
  00A7                10         SW1         BIT   P2.7
  00B3                11         KEY         BIT   P3.3
0000                  12         org  000h
0000 020100           13         JMP  START
0100                  14         ORG  100H
                      15     ;----------------------------------------
0100 7580F0           16     start:mov   P0,#0f0h          ;初始化MCU端口
0103 7590FF           17           mov   P1,#0ffh
0106 75B0FF           18           mov   P3,#0ffh
0109 75A0FF           19           MOV   P2,#0ffH
010C 7400             20           MOV   A,#00H           ;初始化寄存器
010E 75D000           21           MOV   PSW,#00H
0111 75A800           22           MOV   IE,#00H
0114 758130           23           MOV   SP,#30H
                      24           
0117 30A706           25     MAIN:  JNB   SW1,CCW_LP     ;正常電機正向轉動
011A 900144           26            MOV   DPTR,#TAB_CCW   ;按下SW1鍵,電機反向轉動
011D 020123           27            JMP   LOOP
0120 900144           28     CCW_LP:MOV  DPTR,#TAB_CCW
0123 E521             29     LOOP:  MOV   A,BUFF_STEP
0125 93               30            MOVC  A,@A+DPTR
0126 F5A0             31            MOV   P2,A
0128 120137           32            LCALL  DEL
012B 0521             33            INC   BUFF_SteP
012D E521             34            MOV   A,BUFF_STEP
012F B404E5           35            CJNE  A,#04H,MAIN
0132 752100           36            MOV   BUFF_STEP,#00H
0135 80E0             37            JMP   MAIN
                      38     
0137 7E0A             39     DEL:   MOV   R6,#10
0139 7FC8             40     DEL0:  MOV   R7,#200
013B DFFE             41            DJNZ  R7,$
013D DEFA             42            DJNZ  R6,DEL0
013F 22               43            RET
                      44     ;TAB_CW:  DB   00000011B,00001001B,00001100B,00000110B     ;正轉相序
0140 03060C09         45     TAB_CW:  DB   00000011B,00000110B,00001100B,00001001B     ;正轉相序
0144 090C0603         46     TAB_CCW: DB   00001001B,00001100B,00000110B,00000011B     ;反轉相序
                      47     
                      48              END
A51 MACRO ASSEMBLER  DEMOSTEP                                                             06/02/2006 15:17:40 PAGE     2

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


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

BUFF_STEP. . . . .  N NUMB   0021H   A   
CCW_LP . . . . . .  C ADDR   0120H   A   
DEL. . . . . . . .  C ADDR   0137H   A   
DEL0 . . . . . . .  C ADDR   0139H   A   
IE . . . . . . . .  D ADDR   00A8H   A   
KEY. . . . . . . .  B ADDR   00B0H.3 A   
LOOP . . . . . . .  C ADDR   0123H   A   
MAIN . . . . . . .  C ADDR   0117H   A   
P0 . . . . . . . .  D ADDR   0080H   A   
P1 . . . . . . . .  D ADDR   0090H   A   
P2 . . . . . . . .  D ADDR   00A0H   A   
P3 . . . . . . . .  D ADDR   00B0H   A   
PSW. . . . . . . .  D ADDR   00D0H   A   
SP . . . . . . . .  D ADDR   0081H   A   
START. . . . . . .  C ADDR   0100H   A   
SW1. . . . . . . .  B ADDR   00A0H.7 A   
TAB_CCW. . . . . .  C ADDR   0144H   A   
TAB_CW . . . . . .  C ADDR   0140H   A   


REGISTER BANK(S) USED: 0 


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