Timing code assumes 1.2MHz Clock
LCD Registers addresses
LCD_CMD_WR equ 0 ；宏定义
LCD_DATA_WR equ 1
LCD_BUSY_RD equ 2
LCD_DATA_RD equ 3
LCD Commands
LCD_CLS equ 1
LCD_HOME equ 2
LCD_SETMODE equ 4
LCD_SETVISIBLE equ 8
LCD_SHIFT equ 16
LCD_SETFUNCTION equ 32
LCD_SETCGADDR equ 64
LCD_SETDDADDR equ 128
Reset vector
org 0000h；程序开始入口地址0x00
jmp start；跳转到start处
Start of the program
org 0100h
string1a:db ' !! A M A Z I N G !! '；表格，要显示的内容。
db 0
string1b:db '!! A M A Z I N G !! '
db 0
string2:db ' A virtual LM032L... '
db 0
string3:db ' driven by a virtual '
db 0
string4:db ' 8051 processor!'
db 0
start: mov A,#038h 为什么是38h：查1602数据手册，38h的命令
call wrcmd
loop: mov A,#LCD_SETVISIBLE+6 Make the display &blink visible:
call wrcmd
mov R7,#2
loop2:
mov DPTR,#string1a
call wrstr
mov DPTR,#200
call wtms
mov A,#LCD_CLS Clear screen
call wrcmd
mov DPTR,#string1b
call wrstr
mov DPTR,#200
call wtms
mov A,#LCD_CLS Clear screen
call wrcmd
djnz R7,loop2
mov DPTR,#string1a
call wrstr
mov DPTR,#400
call wtms
mov A,#LCD_SETDDADDR+64
call wrcmd
mov DPTR,#string2
call wrslow
mov DPTR,#200
call wtms
mov A,#LCD_CLS Clear screen
call wrcmd
mov DPTR,#string3
call wrslow
mov A,#LCD_SETDDADDR+64
call wrcmd
mov DPTR,#string4
call wrslow
mov A,#LCD_SETVISIBLE+7 Show the blink cursor as well.
call wrcmd
mov DPTR,#2000
call wtms
mov A,#LCD_CLS Clear screen
call wrcmd
jmp loop
Sub routine to write null terminated string at DPTR in program ram.
wrstr: mov R0,#LCD_DATA_WR
wrstr1: clr A
movc A,@A+DPTR
jz wrstr2
movx @R0,A
call wtbusy
inc DPTR
push DPL
push DPH
pop DPH
pop DPL
jmp wrstr1
wrstr2: ret
Sub routine to write null terminated string at DPTR in program ram. Slowly
wrslow: mov R0,#LCD_DATA_WR
wrslw1: clr A
movc A,@A+DPTR
jz wrslw2
movx @R0,A
call wtbusy
inc DPTR
push DPL
push DPH
mov DPTR,#100
call wtms
pop DPH
pop DPL
jmp wrslw1
wrslw2: ret
Sub routine to write command:
wrcmd: mov R0,#LCD_CMD_WR
movx @R0,A
jmp wtbusy
Sub routine to write character:
wrchar: mov R0,#LCD_DATA_WR
movx @R0,A
Subroutine to wait for busy clear
wtbusy: mov R1,#LCD_BUSY_RD
movx A,@r1
jb ACC.7,wtbusy
ret
Wait for number of seconds in A
wtsec: push ACC
call wtms
pop ACC
dec A
jnz wtsec
ret
Wait for number of milliseconds in DPTR
wtms: xrl DPL,#0FFh Can't do DEC DPTR, so do the loop by forming 2's complement
xrl DPH,#0FFh and incrementing instead.
inc DPTR
wtms1: mov TL0,#09Ch 100 ticks before overflow = 1ms at 1.2MHz Clock
mov TH0,#0FFh
mov TMOD,#1 Timer 0 mode 1
setb TCON.4 Timer 0 runs
wtms2: jnb TCON.5,wtms2
clr TCON.4 Timer 0 stops
clr TCON.5
inc DPTR
mov A,DPL
orl A,DPH
jnz wtms1
ret
END
也没去理解AC，只知道第一行第1点的地址是80H，第二行第1 点是C0H。
下面就是你要的程序，仅供参考
RS BIT P1.2 这3位是液晶屏的控制信号,连接方式由具体硬件而定
RW BIT P1.1
E BIT P1.0
ORG 00H
AJMP MAIN
ORG 30H
MAIN:
mov R0,#24
ACALL INITIAL
ACALL DISPLAY调用液晶显示子程序
AJMP MAIN
-------液晶显示---------------------------------------
DISPLAY:
MOV A,#80H 第一行第1 个点
ACALL WR_CMD
MOV DPTR, #LINE1
ACALL PR_STR
ACALL WR_DATA
DISP1:
MOV A,#1CH 字符左移命令（注：实物中左移命令字为18H）
ACALL WR_CMD
ACALL D05S
DJNZ R0,DISP1
RET
---液晶屏初始化-------------------------------------------------
INITIAL:
MOV A, #01H
ACALL WR_CMD
MOV A, #38H
ACALL WR_CMD
MOV A, #0CH
ACALL WR_CMD
MOV A, #06H
ACALL WR_CMD
RET
----写液晶指令的子程序------------------------------------------
WR_CMD:
MOV P3, A
CLR RS 写入控制命令
CLR RW
CLR E
ACALL DELAY
SETB E
RET
----写液晶数据---------------------------------------------
WR_DATA:
MOV P3, A
SETB RS 写入数据
CLR RW
CLR E
ACALL DELAY 判断液晶模块是否忙?
SETB E
RET
-----写行字符---------------------------------------------------------------
PR_STR:
CLR A
MOVC A, @A+DPTR
JZ END_PR
ACALL WR_DATA
INC DPTR
AJMP PR_STR
END_PR:
RET
----查看液晶忙碌信号---------------------------------------------------------
DELAY:
MOV P3,#0FFH 判断液晶显示器是否忙的子程序
CLR RS
SETB RW
CLR E
NOP
SETB E
JB P3.7,DELAY 如果P3.7为高电平表示忙就循环等待
RET
----0.5S延时(按12MHZ算)-----------------------------------------------------------------
D05S:
MOV R6,#25
MOV R5,#100
MOV R4,#100
DJNZ R4,$
DJNZ R5,$-4
DJNZ R6,$-8
RET
--------------------------------------------------------------------------------------
LINE1:
DB ' ZHU NI YI SHENG PING AN',00H
END
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