Interfacing 16x1 LCD display with 8051

Lean how to interface 16x1 LCD with 8051
Last Edited: Sep-2008
Interface LCD with 8051, Programming of LCD, Code for LCD display - Keywords
Now a Days, LCD or Liquid Crystal Display are very common for Displaying Alphanumeric characters.The Working of 16 x 1 LCD is Little Bit Different then of LCD 16 x 2.

In Most of Cases 16 x 1  LCD is available without Auxiliary Controller. Means as you see only HD44780 Controller at Back Side. In this section we discuss LCD 16 x 1 with no Auxiliary Controller.
Figure 1:  16 x 2 LCD
Figure 2:  16 x 1 LCD
The above Images will clearly mention the difference between two. The 16 x 2 LCD having with Auxiliary Controller shows two epoxy blobs but the 16 x 1 LCD Shows only one epoxy blobs.Due to low cost Single Row LCD do not have Auxiliary Controller
LCD Addressing
Here is Addressing Scheme for 16 x 2 LCD.
Now Just Look at addressing scheme of LCD.
It is Interesting to know that LCD 16 x 1 is Technically LCD 8 x 2. But the Arrange or configuration will be different as below:
In Below program we have assumed following pin assignment with 8051 Microcontroller.

LCD DATA LINES    =  P2
LCD RW                     =  Permanently Ground
LCD RS                      =  P0.4
LCDEN                      =  P0.3
Assembly Level Program


;SINGLE ROW LCD 16 x 1
; Technical LCD 16 x 1 = 2 x 8
; First 8 characters are at 00h - 07h and the others are at 40h - 47h. This must be initialized as a 2-line device.
; after writing first 8 characters, move your cursor to the location 40h (9th character) using this command: 0C0H

$mod51
rs equ p0.4  ; RS
en equ p0.3   ;EN
dat equ p2    ; DATA

      org 0000h


mov a,#38h               ;  16 x 1 LCD
acall command 
mov a,#0fh             ;    Disply on,Cursor Blinking
acall command
mov a,#06h             ;    Increment Cursor
acall command
mov a,#01h             ;    Clear Disply
acall command
mov a,#80h             ;    Force Cursor to  Begining of First Line
acall command



     ; Write first eight character

mov a,#'A'             ; 1st Character
acall display
mov a,#'B'             ; 2nd Character
acall display
mov a,#'C'             ; 3rd Character
acall display
mov a,#'D'             ; 4th Character
acall display
     
     mov a,#'E'             ; 5th Character
acall display
mov a,#'F'             ; 6th Character
acall display
mov a,#'G'             ; 7th Character
acall display
mov a,#'H'             ; 8th Character
acall display


      mov a,#0C0h             ;    Force Cursor to  Begining of First Line
acall command
     
    

     ; Write first eight character

mov a,#'I'             ; 1st Character
acall display
mov a,#'J'             ; 2nd Character
acall display
mov a,#'K'             ; 3rd Character
acall display
mov a,#'L'             ; 4th Character
acall display
     
     mov a,#'M'             ; 5th Character
acall display
mov a,#'N'             ; 6th Character
acall display
mov a,#'O'             ; 7th Character
acall display
mov a,#'P'             ; 8th Character
acall display



here: sjmp here

command:
mov dat,a
clr rs                 ;RS=0 For COMMAND REGISTER
setb en
clr en
acall ready
ret

; Approx. 20ms Delay
ready:
MOV TMOD,#01H                      
MOV TCON,#00H
MOV TL1,#0E0H
MOV TH0,#0B1H
SETB TR0
WAIT: JNB TF0,WAIT
RET

display:
mov dat,a
setb rs                  ;RS=1 For DATA REGISTER
setb en
clr en
acall ready
ret
           end

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