A51 MACRO ASSEMBLER  LCD                                                                  02/19/2005 20:25:17 PAGE     1


MACRO ASSEMBLER A51 V6.23
OBJECT MODULE PLACED IN lcd.OBJ
ASSEMBLER INVOKED BY: C:\TOOLS\Keil\C51\BIN\A51.EXE lcd.asm SET(SMALL) DEBUG EP

LOC  OBJ            LINE     SOURCE

                       1     ;實驗名稱：字符型LCD接口實驗
                       2     ;  功能：在LCD上顯示
                       3     ;        AT89S51 DEMO
                       4     ;       www.mcuprog.com
                       5     ;
                       6     
  00B5                 7     E               BIT     P3.5
  00B6                 8     RW              BIT     P3.6
  00B7                 9     RS              BIT     P3.7
  0080                10     LCDPORT         EQU     P0
  0030                11     CMD_BYTE        EQU     30H
  0031                12     DAT_BYTE        EQU     31H
                      13     
0000                  14                     ORG     0000H
0000 0150             15                     AJMP    MAIN
0050                  16                     ORG     0050H
0050 758160           17     MAIN:           MOV     SP,#60H
0053 120082           18                     LCALL   INITLCD
0056 1200AD           19                     LCALL   DISPMSG1
0059 1200C5           20                     LCALL   DISPMSG2
005C 80FE             21                     SJMP    $
                      22                     
                      23     ;LCD1602要用到的一些子程序
                      24     ;寫命令(入口參蔆MD_BYTE)
005E C2B7             25     WRITE_CMD:      CLR     RS
0060 C2B6             26                     CLR     RW
0062 E530             27                     MOV     A,CMD_BYTE
0064 F580             28                     MOV     LCDPORT,A
0066 D2B5             29                     SETB    E
0068 00               30                     NOP
0069 00               31                     NOP
006A C2B5             32                     CLR     E
006C 1200DD           33                     LCALL   DELAY
006F 22               34                     RET
                      35     
                      36     ;寫顯示示