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Assembly code for LCD - Liquid Crystal Display

Sample code for LCD - Liquid Crystal Display
Following code can be using for 8051 and 8052 ICs like: 89c51, 89c52, 89s51, 89s52, 89c2051.

 

;==========================================================
; Pin Definations
;==========================================================
lcddatabus      equ     80h     ;LCD Data Bus   P0
lcdrs           equ     a7h     ;RS     P2.7    
lcden           equ     a6h     ;EN      P2.6
;==========================================================
; Main Program starts from here
;==========================================================
start        call lcdinit
                mov dptr,#msgwelcome
                call lcddisp
back        jmp back
;==========================================================
; Sub routines starts from here
;==========================================================
lcdinit         mov lcddatabus,#38h
                call lcdcmd
                mov lcddatabus,#38h
                call lcdcmd
                mov lcddatabus,#38h
                call lcdcmd
                mov lcddatabus,#38h
                call lcdcmd
                mov lcddatabus,#0ch
                call lcdcmd
                mov lcddatabus,#01h
                call lcdcmd
                mov lcddatabus,#06h
                call lcdcmd
                ret
;==========================================================
lcdcmd          clr lcdrs
                setb lcden
                nop
                nop
                clr lcden
                call lcddelay
                ret                        
;==========================================================
lcddata         setb lcdrs
                setb lcden
                nop
                nop
                clr lcden
                call lcddelay
                ret
;==========================================================                         
lcddelay        mov delreg1,#10             ;LCD
lcddelay1       mov delreg2,#250
                djnz delreg2,$
                djnz delreg1,lcddelay1
                ret
;==========================================================
lcddisp         mov lcddatabus,#01h
                call lcdcmd
                mov 39h,#00h
lcddisp2        mov a,39h
                movc a,@a+dptr
                cjne a,#'@',lcddisp1
                mov lcddatabus,#c0h
                call lcdcmd
                inc 39h
                jmp lcddisp2
lcddisp1        cjne a,#'$',lcddisp3
                call pc_int
                ret
lcddisp3        mov lcddatabus,a
                call lcddata
                inc 39h
                jmp lcddisp2
;==========================================================
; Messages to be displayed on LCD
;==========================================================
msgwelcome      db " WELCOME TO     @INTERFACING PROG$"
;=====================================================
;      	Program ENDS here
;=====================================================