The most commonly used Character based LCDs are based on Hitachi's HD44780 controller or other which are compatible with HD44580. In this tutorial, we will discuss about character based LCDs, their interfacing with various microcontrollers, various interfaces (8-bit/4-bit), programming, special stuff and tricks you can do with these simple looking LCDs which can give a new look to your application.

For Specs and technical information HD44780 controller Click Here

Pin Description

The most commonly used LCDs found in the market today are 1 Line, 2 Line or 4 Line LCDs which have only 1 controller and support at most of 80 charachers, whereas LCDs supporting more than 80 characters make use of 2 HD44780 controllers.

Most LCDs with 1 controller has 14 Pins and LCDs with 2 controller has 16 Pins (two pins are extra in both for back-light LED connections). Pin description is shown in the table below.

Figure 1: Character LCD type HD44780 Pin diagram

Pin No. Name Description
1VSSPower supply (GND)
2VCCPower supply (+5V)
3VEEContrast adjust
4RS0 = Instruction input
1 = Data input
5R/W0 = Write to LCD module
1 = Read from LCD module
6ENEnable signal
7D0Data bus line 0 (LSB)
8D1Data bus line 1
9D2Data bus line 2
10D3Data bus line 3
11D4Data bus line 4
12D5Data bus line 5
13D6Data bus line 6
14D7Data bus line 7 (MSB)
Table 1: Character LCD pins with 1 Controller
Pin No. Name Description
1D7Data bus line 7 (MSB)
2D6Data bus line 6
3D5Data bus line 5
4D4Data bus line 4
5D3Data bus line 3
6D2Data bus line 2
7D1Data bus line 1
8D0Data bus line 0 (LSB)
9EN1Enable signal for row 0 and 1 (1stcontroller)
10R/W0 = Write to LCD module
1 = Read from LCD module
11RS0 = Instruction input
1 = Data input
12VEEContrast adjust
13VSSPower supply (GND)
14VCCPower supply (+5V)
15EN2Enable signal for row 2 and 3 (2ndcontroller)
16NCNot Connected
Table 2: Character LCD pins with 2 Controller
Usually these days you will find single controller LCD modules are used more in the market. So in the tutorial we will discuss more about the single controller LCD, the operation and everything else is same for the double controller too. Lets take a look at the basic information which is there in every LCD.

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Wed Oct 19 2016, 03:30 PM
can you provide an explanation for the inverter 8051 code and how it works
Sat Oct 15 2016, 12:15 AM
@snaya. Create a thread in the 8051 forum for your questions
Fri Oct 14 2016, 10:00 AM
i m going to make a project with 8051and the name is scrolling led message display .now i wanna ask so many of questions.may be u can help me .so help me out
Fri Sep 30 2016, 10:40 AM
plz I want code for adc interfacing with8051
Sun Sep 25 2016, 04:41 AM
hi sir, could you help me regarding simple multiplication calculator?it should be include with buzzer. i use dragonplus. please
Sat Sep 24 2016, 05:49 PM
@Rus Ans .. what project ?
Sat Sep 24 2016, 05:48 PM
@engr1931 depends on type of scanner
Sat Sep 24 2016, 03:07 PM
Is it possible to send data from 2 barcode scanner to pc using serial port using 8051?
Wed Sep 21 2016, 02:22 AM
Rus Ana
can anyone help me for my project? T.T
Fri Sep 09 2016, 02:54 PM
Sarath babu
8051 a/c motor speed control



[email protected]
Fri Oct 21 2016, 10:35 PM
Sat Oct 15 2016, 09:40 AM
Wed Oct 05 2016, 08:16 AM
Mon Oct 03 2016, 07:37 PM
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Forum Activity
Pratik_Suthar Avatar
Posted By Pratik_Suthar
Thu Oct 13 2016, 12:39 PM
@martin the HEX file provided in the project is no...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Oct 06 2016, 06:15 AM
Hi Phil, Do you want to add this to existing proje...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Oct 06 2016, 06:13 AM
CE should be high when you go for reading mode/wai...
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Posted By ajay_bhargav
Thu Oct 06 2016, 06:03 AM
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ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Oct 03 2016, 11:15 PM
This is an old thread and the links no longer work...
martinsnc115877 Avatar
Posted By martinsnc115877
Wed Sep 14 2016, 12:51 PM
sir, i did your led scrolling mass display, and it...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Sep 09 2016, 11:45 PM
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rajavarmanslr Avatar
Posted By rajavarmanslr
Thu Aug 18 2016, 01:40 PM
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