201 Liquid Crystal Display Module and Its Application

key word:

HY-240128M-201, LCD


According to different display modes and contents, LCD modules commonly used in instruments and meters include pen segment type and dot matrix type. The former can be used to display a limited number of simple symbols, and the control is also relatively simple. The latter can be divided into two types: character LCD module and graphic LCD module. The dot matrix LCD module displays a lot of information, which can display characters, Chinese characters, graphics and curves, and is easy to interface with the microprocessor. Therefore, it is often used to display the working parameters of the equipment in the mechanical equipment control and automatic production line, or to display the working process of the equipment and production line in a graphical way.

From the perspective of practical application, after briefly introducing the composition and working principle of HY-240128M-201 graphic dot matrix liquid crystal display module based on T6963C controller, this paper focuses on the application method of this liquid crystal display module, and gives the idea and design points of software / hardware design with atmega8535 single chip microcomputer.

Fig. 1 circuit diagram of interface between HY-240128M-201 and atmega8535 single chip microcomputer

Introduction to LCD module

HY-240128M-201 is launched by Beijing Baldwin Electronic Technology Co., Ltd × 128 dot matrix LCD module. Although the working principle of the internal circuit of the LCD module is complex, the display module only leaves one interface to communicate with the outside. LCM can receive display commands and data through this interface and display them according to the requirements of commands and data; The external circuit also reads out the working state and display data of the display module through this interface. Users only need to understand the function of LCM external pins and the display principle of the module. This LCM provides two interfaces: parallel and serial data transmission command interface. 8-bit transmission is adopted in parallel mode, that is, 8-bit commands or data are transmitted at one time; The serial mode adopts 4-bit data bus transmission. In order to make the LCD module have more stable display, parallel transmission mode is often used in practical application.

HY-240128M-201 LCD module mainly consists of one LCM controller T6963C, two row drivers t6a40, three column drivers t6a39, one 8KB display memory 6264 and one 240 × 128 dot matrix LCD. 6a40 is a 68 channel line driver matched with T6963C. It converts the serial signal from T6963C into parallel signal to drive the corresponding line on the LCD. This module has 128 rows of dot matrix, so two t6a40 are used, of which the second uses only 60 channels. T6a39 is an 80 channel column driver matched with T6963C. It converts the serial column signal from T6963C into parallel signal to drive the corresponding column on the LCD. HY-240128M-201 has 240 lattice arrays, so three t6a39 are used.

Interface and control between MCU and LCD module

Since the T6963C interface is applicable to 8080 series and Z80 series MPU, the / RD and / WR of 8031 can be directly used as the read and write control signals of the LCD module. The VDD of the LCD module is connected with 5V voltage and / reset is connected with RC reset circuit/ The CE signal can be generated by address line decoding. The C / D signal is provided by a pin a * in the address line, and a * = 1 is the address of the instruction port; A * = 0 is the data port address. The indirect control mode indirectly realizes the control of the LCD module through the I / O parallel interface of MPU according to the timing of the analog module. This access mode does not occupy the memory space of CPU, its interface circuit is independent of timing, and its timing is completely realized by software programming.

Interface connection between LCM and atmega8535 single chip microcomputer

Because the bus read-write cycle of atmega8535 is 50ns, which is hundreds of times that of 51 Series MCU. For this kind of high-speed MPU, it is better to adopt the indirect mode, that is, to communicate with the LCD controller by simulating the timing of the LCD controller. Based on the strong practicability and simple interface mode of indirect method, the interface method between HY-240128M-201 LCM and atmega8535 single chip microcomputer in AVR series is given below, and the circuit is shown in Figure 1.

LCM power supply circuit

HY-240128M-201 requires three power supplies: logic power supply, driving power supply and backlight power supply. The logic power supply is provided through VSS and VDD pins; The driving power supply is provided through V0 and Vee; Backlight power is provided through Leda and ledk.

VSS and ledk can be directly grounded, Vdd and Leda can be grounded to 5V; V0 is grounded through the potentiometer and Vee is connected to the sliding terminal to adjust the driving voltage. When the driving voltage is too low, there is no display on the screen, and when it is too high, the screen is completely black. Note that the maximum resistance of potentiometer should be between 10kw-20kw.

Reset circuit of LCM

The reset pin is 16 - / rst. It is in the normal state at high level and in the reset state at low level. It clears the row and column counters and display registers. The reset circuit part can be connected to 5V through 4.7KW resistance and 4.7 to ground μ It can also be directly connected with the I / O port of the single chip microcomputer and controlled by software. Note that the reset can be realized only when the / RST pin remains low for 5 clock cycles after LCM is powered on.

LCM command control interface

HY-240128M-201 LCM external panel provides 5 command interfaces, 15 pin (/ CE) is the enable signal terminal, and the low level is effective; Pin 4 (C / D) is the channel selection signal, 1 is the command channel and 0 is the data channel. At the same time, the command and data can be read and written by controlling the input signals of / RD and / WR.

LCM font selection

18 pin FS is used to select font. T6963C stipulates that this pin is at low level and the font is 8 × 8 dot matrix form, otherwise it is 8 × 6 dot matrix form. Note that this pin cannot be suspended if the font used is 8 × 8, you can ground this pin or connect the I / O pin of MPU and set the display font through software.

Control software design

The software is developed with iccavr-c language. It has strong software control ability, that is, the main control CPU writes instructions to the LCD module through the interface to realize module control. The program design mainly includes two parts. One is to design general subroutines such as LCD reading and writing instructions or data, initialization and screen cleaning. The initialization setting mainly includes the following aspects: setting the respective head address and area width of text display buffer, graphic display buffer and cgram area, setting LCM working mode and display mode, and selecting cursor shape. The other part is the display module program of Chinese characters and graphics. The display operation is to write the dot matrix information of the characters or graphics to be displayed into the specified position in the display buffer. The content to be displayed is determined by the display mode setting part in initialization. With a general subroutine, various display programs can be constructed. When the graphic display mode is adopted, it is similar to the principle of character, Chinese character and menu graphic display. The key lies in the establishment of font library. Special Chinese character graphic dot matrix information extraction software (such as zimo21 or image2lcd) can be downloaded on the Internet, which can extract 8 × 16 or 16 × 16 and other dot matrix information in assembly or C language, as well as dot matrix data of various pictures. When atmega8535 single chip microcomputer is used to control the LCD module, because it is an indirect access mode, it is necessary to have a good understanding of the read / write operation timing.

T6963C controller timing

When the data instruction setting bit C / D is high, the enable bit / CE is low, the write status bit / WR is high and the read status bit / RD is low, the status of the internal controller can be read from the parallel data port.

When the data instruction setting bit C / D is high, the enable bit / CE is low, the write status bit / WR is low, and the read status bit / RD is high, you can write instructions to the internal controller through the parallel data port.

When the data instruction setting bit C / D is low, the enable bit / CE is low, the write status bit / WR is low and the read status bit / RD is high, data can be written to the internal controller through the parallel data port.

Design a general subroutine for LCD reading and writing instructions or data

Lcd status detection subfunction

Before writing data or commands, check the status of LCM first, that is, the command ready (sta0) and data ready (STA1) in the status register need to be checked at the same time. Only when these two bits are "1" (LCM idle state) at the same time can write data and commands. Normally, a read state subfunction can be designed to judge the empty / busy state of the two flag bits.

Display sub functions of characters and graphics

The display mode of LCD includes text and graphic display. When the graphic display mode is adopted, the management unit of LCD display information is 8 × 1 dot matrix, called a graphic display unit. According to this unit, T6963C divides the LCD screen into 20 columns in the horizontal direction and 128 rows in the vertical direction, a total of 20 × 128 graphic display units, and each graphic display unit corresponds to a storage unit in the graphic display buffer. When the lattice state information is written into the storage unit, the graph is displayed at the corresponding position. When the text display mode is adopted, the dot matrix status information is not written to the text display buffer, but the character code, and its dot matrix status information (8 × 8) , that is, the font is stored in cgram. After writing the character code into the text display buffer, T6963C takes out the lattice state information of the character corresponding to the character code from cgram, and drives the LCD to display the character through the row and column driver.

Screen cleaner function

Before displaying data, first clear the last displayed content on the screen. To do this, you need to use the screen clearing function. You only need to write "0" to the whole screen. The specific process is omitted.

Precautions for debugging LCD module

Precautions in circuit design

The liquid crystal driving voltage of HY-240128M-201 is as high as - 19v. Once it is wrongly connected to other pins, the driving and control chips in the liquid crystal module will be burned in a short time. Therefore, before power on, it is necessary to repeatedly confirm that the power lines are connected correctly. It is best to connect the driving power supply with the liquid crystal module through an electric level.

Pay attention to the correctness of the reset line level state. When the product is used in a good environment, the RC reset circuit provided in the pin definition can be directly used; However, when the product is used in a harsh environment, it is best to connect / RST to the port of MPU.

Commissioning precautions

Before the initial power on, slowly adjust the potentiometer so that the output of the driving power terminal is adjusted at about 0V, observe the display, monitor the LCD driving voltage, and then slowly adjust to the normal working point. During the adjustment process, do not make the LCD module bear the driving voltage exceeding the maximum value, otherwise the LCD module will be damaged. If the color change on the display screen is observed when it is lower than or approximately equal to the typical driving voltage, that is, the bottom color of the display field is slightly darker than the edge color, it indicates that the power supply of the LCD module is connected correctly and can work in the next step. If the color change on the display screen is not observed when it is adjusted to exceed the typical value of 2-3v at room temperature, it is not necessary to continue the adjustment.

Application of HY-240128M-201 in virtual simulation robot control system

The virtual simulation control system establishes the explosion Removal Robot and virtual environment model with 3d-max, and draws the simulation environment with OpenGL. The control panel controls the explosive disposal robot in the simulation environment to complete various training actions. The whole system is integrated into a control box, which includes a control panel, a display and an integrated PC. the host in the lower computer of the system first collects the analog data and digital data on the control panel to convert the operation of the buttons on the operation panel into control instructions, and then sends commands to the upper computer through the serial port every 50ms. After receiving the data, the upper computer controls the virtual simulation robot, Finally, the host computer collects virtual data

201 Liquid Crystal Display Module and Its Application 1

get in touch with us
مقالات مقترحة
مدونة او مذكرة
Back to School Help!Read Details! Get 10Points For1 with Best Outfit!?
go to www.polyvore.com and type in first ay of school and people make collages of what to wear and on the side it tell you wear you can buy it i love that website go check it out• Related QuestionsHow do you like my first chapter?It sounds just like Twilight only difference is the chick is the vamp. I bet next chapter will feature a boy who has an 'aura' that makes her want to suck his blood or something equally ridiculous.Your originality staggers me.------Is this an incredibly stupid idea?technicality you shouldn't get in trouble for that... but i have gotten in trouble for similar things when i was in school... they called it a distraction to other students (i was doing the goth thing before it was popular).------What to wear now in Miami?TRAVEL LIGHT AND ALWAYS BRING A CHANGE OF CLOTHES FOR A NIGHT ON THE TOWN!! tHE BEACH IS THE NECESSARY BIKINI REGARDLESS, AND THE NIGHT LIFE IS NOT MUCH MORE IF YOUR LOOKIN FOR A GREAT TIME...........iT IS MIAMI!!!!!------Should I wear a dress or a skirt on Valentine's Day?It depends upon the weather for me really. Within the fall I like to wear longer skirts and in the wintertime I wear longer ones with my boots, however in the spring and summer I prefer to wear short summer dresses------am looking for a wedding gown that i saw in a magazine years ago, fell in love with it. now cant find it help?Have you gone to a bridal shop yet? There may be some that have an archive of sorts of wedding gowns (photos, magazines, etc) that you may be able to find something close if not 'the one'.Good luck & Congrats------Can anyone read about these dreams for me please?Well, i think you like this guy. But you may be scared and unsure of what your friends think of it. try talking to your friends :)help me? thanks ------how do i look cute with my dress code?oh gosh...wow, that must be tough but one word ACCESSORIES! i now leave you to think...try: hope you find something you like :)------Ladies what is a good outfit for fall weather?girl jeans--ripped.((makes guys look so effin sexy))brown and red colors.((to make you blend in with the season))and some nice high heels that are so god damm gourgous it makes girls jeloushahahhope this helpssexy bioch------How is my intro for my story?i don't think you should say "all the more scary looking" in paragraph # 2. and in paragraph # 3 maybe u should say the doll looked most appauling afyter seeing the red yarn stiched over the mouth. Other than that AWESOME!------How would someone with this personality look/dress like?So if she is wealthy and artistic, probably like beige trousers with a navy blue jacket and white top. OR mayeb this outfit jpg.------This is the first half of chapter 1 in my book I'm writing. Can anyone read it and tell me how it is?omfg that is such a good story it makes me think of the twilight saga i love how you give so many details and describe his face i love the names and you need to keep on writing keep me updated------What shall i do about my daughter starting middle school???!?Woah, when I was that age I went to bed at 9:00 and read for an hour. I would say 8:30 - 10:00. Take her on a shopping spree at Justice. They have 40% off sales and cute clothes too. No more movies and chocolate------does anybody want to make me an outfit?Age: 15 Gender: woman form: in maximum circumstances Skater with incredibly Like, Prep colors: Any shade of green, Black, pink, Blue, pink clothing: T-Shirts, Hoodies, skinny denims shops: PacSun, Delias, heat concern count number, Abercrombie shoes: communicate, autos upload-ons: Necklaces, rings------Back to school clothes shopping list!!?I like girls in jeans. It makes them look more home town like and it doesn't look like they try too much but if you are looking to get this men attention, this might not be what you would like------beauty tips for young teen plz?were just the same but im tall not short lolthis is what goes on menavy blue, tan , dark greensskinny jeansflats or kitten heelst-shirts on long vestslongs coats that elongats your figuehope this helps------shorts and a band-aid, or should i cover it up.?Shorts Shorts Shorts.Oh god Please Do Not Wear A Long Sleeve ShirtUnder A Spaghetti Strap Dress.Just Wear Shorts and Everything Will Be Fine,I Mean If You Have Your Ankle Brace,Then Why Does A Band Aid Matter.------Can i wear a long sleeves dress to prom?Hello:Yeah go for it. but if you'd like to be in style try making one out of clean unused plastic garbage/trash/bin bags. That material is in style these days. I hope I helped, if not I'm sorry.------Can i just wear a t-shirt and pants for ice skating and not a long sleeve or with jacket?well it depends if your a good skater or not ....if its your first time ... wear jeans ... it don't hurt as much when you fall over ... and also wear a jacketthe temperature is normally 0-3 degrees in indoor rinks------Winter mommies...what type of outfit?i live in michigan. so it may be a little different. plus my son was born in march. but he went home in a university of michigan sleeper. we had a huge snow storm the day my son was born too------fashion/dress for teen girls in boston?Boston gets very cold in the fall/winter so make sure you pack a lot of warm clothes such as jackets, sweatshirts/pants, jeans, long sleeves, etc...In September, you could probably wear shorts if it's early in the month------Cute Ways To Dress For School?This Site Might Help You.RE:Cute Ways To Dress For School?I really like blue jeans and layering shirts , what are some things i can use as comfy assecories and some cute casual things to do with my hair THANKS------At a traditional Catholic wedding w/o communion at 7pm, do I have to wear a long dress??I like girls in jeans. It makes them look more home town like and it generally does not look like they try too hard but if you are looking to get this men attention, this might not be what you want------I think one of my students is being neglected/abused?well...don't you have an obligation to report anything out of the ordinary?? I would talk to the guidance counselor at your school and see what the next approach would be...they are better equipped for situations like yours. good luck------I'm fashionably challenged please help?well, 10 things that a teenage girl must have in her wardrobe are1) a little black dress2) a trench coat3) heels4) neutral coloured flats5) neutral coloured handbag6) a cardigan7) a blazer8) a day dress9) good pair of jeans10) an all occasions top------What is your school's dress code?bottoms, below fingertips3finger sleeveswe are allowed to wear any type of shoes, including flipflopspajamas are not a problem, (besides by style)those saggy type hats are acceptable, but not like sports capsheadbands everyone wears themhoodsno------Which of these dresses do you like the most?hey, i like the first one which is pink. It will really suit your age. If you changed the color to Black would also be nice. I have noticed that all of the dresses are short. Yet they are really pretty!------Anyone else have a daughter/s like this?Well u cant get her all dresses because school starts in the fall which means winter is right around the corner and you just said that she'll wear pants wen its cold so yes get her some pants as well :)------Why do females athletes wear tiny clothing and males dont?Sad to say but I think they want to make a fashion statement. Who knows maybe it's an endorsement for the clothing and so they get money for it. You are right others do just fine and even win some!.------Do women care how a man dresses or is that only shallow immature girls who do?Clothes do matter to me, because they tell you a lot about someone.I just know that I'm going to probably get along better with a guy who has really casual style and dresses for comfort and function rather than fashion.------What is the Disneyland dress code you must have to work there?I really like little skirts and the real way i fix it being brief is leggings and coloured tights. Not the methods with holes however the ones that virtually look like leggings but are obviously tights as a result of material------15 year old girl always comes to class with injuries?Yes, because if there is an abusive parent, someone needs to intervene. Same case if this student's injuries were self-inflicted, which would indicate depression.Unless she secretly fights criminals in her free time and picked up injuries from there.------what can i wear over or under this dress to be warm at a New York evening Wedding? Shoes - Or if you don't like them look at the rest of the shoes on the site.------What kind of hairstyle will look nice with this dress?Angel,it incredibly is a quite gown,yet as a guy,i think of somewhat like the type interior the image,it exhibits the gown and your self greater powerful,in case you spot my factor,so have an astounding time to------Why am I the only one to dress for the cold appropriately at school?I asked myself this same question when I moved to CT. In the winter it gets cold. However, I see many people in shorts and a zipped or pullover sweater. No lie, I even seen this one girl in flip flops.------Anyone with a sense of fashion... please help?I have a good look Somethign like that.------Wearing A Cherry Red Dress To A Wedding?I like females in jeans. It makes them look more city like and it generally does not look like they are trying too hard but if you're trying to get this guys attention, this may well not be what you would like------What would you call my style???? :)?It's really cute and laid back. I think it's more of a girly style with a slight edge.Also, if you want to add details, you can. It's under the edit link on your question or something.------I need a new wardrobe for fall I'm 23. I want advice on what basic essentials I should get to mix and makeGet classic clothes that don't go out of style, and accessorize. The accessories can change with time and you can wear the same clothes as a base. You keep up with fashion trends this way, and save money too.------Where can I find a sweater dress for a reasonable price?urban planet, urban outfitters, costa blanca....those are the only ones i can think of, and i dont know if you have one near you or not.also, a good suggestion, thrift stores! cheap, and you never know what youll find:)------Fall wardrobe for school aged children?my daughter wears uniforms, so i replace them as needed. i never went heavy into shopping as they had plenty of clothes from the summer to last a few months into the school year. i replaced clothes as need then, too------I'm 15 and going to a Georgia wedding in November. What should I wear?!?This is a pretty dress, it's short so not too dressy, but still elegant. Forever 21 has lots of cute dresses...and cheap! ------Why do people think that western riders are pur redneck hillbillies that don't care about their horse?Same reason people think english riders are stuck up snobs that wear their jods so tight so the sticks don't fall out of their butts. Ignorance and bigotry.There are amazing riders of both disciplines. And total jerks in both.------Survey: What is your style? (GIRLS)?1. jeggins and pumps and top and cardigan2. demin skirt and tank top (if its actually hot)3. jeans/jeggins or skirt with tights, uggs and hoodie4. jeggins and hoodie, pumps or uggs5. hollister, river island, primark..random ones6. pink7. down and straightened------What do you think? I'll answer yours if you answer mine. A little bit long, but please help. I'm confused!?It does sound like he likes you, but he may be shy about it or unsure of what to do. You may need to make the first move if you really want something to happen between the two of you------for grae 8 grad i have a dress its like not straps or tube tops its full length and full sleeves but all the?Psh no,it sounds like there trying to be too grown up and to slut-like.As long as your dress is pretty and is not covering your body from the top pf your head to the floor, u should be fine.------Have no idea what to wear on first day?!? would work well :) I suggest lose fitting but not baggy shirt with shorts or boyfriend jeans :P------what is this fall's fashion?cuffed high boots, skinny jeans, and stripped long sleeve sweaters. Thick belts around the waist with a long white shirt and black leggings, kimono styke dresses and peep toe shoes... Try looking at this months issues of Lucky fashion magazine and glamour.
Design Scheme of Multi-channel Voltage Measurement Based on Stm32
How Does Temperature Affect the Speed of Sound?
What Is WiFi? Just Tell Me What It Is, and What It's Used For.?
Which Is Better, WiFi Or ZigBee Wireless Technology
Smart Home Promotes Building Intercom into Thousands of Households, with Large Stock and Incremental
Upgrading of Set Top Box
Buying Manchester United Tickets Online with a One United Membership?
The Benefits of Using the Right Fence Post Lights
Gentlemen, Meet My New Friend Mr Porter
related searches
Back to School Help!Read Details! Get 10Points For1 with Best Outfit!?
Design Scheme of Multi-channel Voltage Measurement Based on Stm32
How Does Temperature Affect the Speed of Sound?
What Is WiFi? Just Tell Me What It Is, and What It's Used For.?
Which Is Better, WiFi Or ZigBee Wireless Technology
Smart Home Promotes Building Intercom into Thousands of Households, with Large Stock and Incremental
Upgrading of Set Top Box
Buying Manchester United Tickets Online with a One United Membership?
The Benefits of Using the Right Fence Post Lights

KingBird Home Furniture