LCD Display- EmbeddedCraft

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

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

[Home] [Query] [FAQ] [Aboutus] [Contact us] [Sitemap] [Privacy Policy] [Advertise ]

Logos and brand names used in this site are belonging to their respected owners. We have used them here only for the purpose of information. Enable Active X control from internet options of internet explorer to view all element of this site.

Best viewed in 1024x768 pixels

RSS FEED