3-wire serial lcd module manufacturer

This LCD module uses a 128x64 liquid crystal display that support Chinese character,  English characters and even graphics. It is suitable for interactive work with Arduino.

It features a backlit control, pallerlel or serial control, contrast adjust. It can be connect to our interface shield for arduino via IDC6 socket and Cable for Shiftout.

The LCD is shipped in Pallelel mode in default.  The R9 is used to set the interface mode. To switch to SPI mode, the R9 resistor need to be moved to R10

The parallel interface typically controls the LCD via 8 data pins and 3 control lines. The control lines used are Enable (E), Register Select (RS), and Read/Write (R/W). RS tells the LCD module if the information being sent is an Instruction or Data. The Enable tells the LCD module that the data or instruction in the register is ready to be interpreted by the LCD Module. Some controllers may have more than one Enable Control Line. The Read/Write tells the module whether to write data or read data from the register.

Serial LCD controllers typically have one Serial Data Line that writes data and cannot read. Normally, a Register Select Line(Sometimes designated A0) is used to tell the controller whether the incoming data is display information or a controller command

SPI, or Serial Peripheral Interface bus, is a synchronous (data is synchronized to the clock) serial data link standard that operates in full duplex mode, which means that devices that can communicate with one another simultaneously. To do this, two data lines are required. With this standard, devices communicate in a master/slave mode, where the master device (host processor) initiates the data and the clock. The LCD module is the (or one of the) peripheral slave device(s) attached to the data bus. Multiple peripherals (display modules and other devices) are addressed on the same serial data bus. However, the LCD module will only listen to the data it sees when the Chip Select line is active (usually low). If the Chip Select line is inactive (usually High), the LCD module listens to the data on the bus, but ignores it. The SDO line is not active when this state occurs. The SPI bus is comprised of four logic signals, two control lines and two data lines and is commonly referred to as SPI (4 wire).

Occasionally, SDI (serial data in) may be called out as MOSI (Master Out Slave In) from Motorola"s original name for these lines and MISO (Master In Slave Out) for SDO. The chip select line may be alternatively labeled SS (Slave-Select), or STE (Slave Transmit Enable). SPI is sometimes referred to as National Semiconductor"s trademark Microwire, which is essentially a predecessor of SPI, which only supports half duplex.

With CS (Chip-Select) the corresponding peripheral device is selected by the LCD Controller. This pin is mostly active-low. In the unselected state the SDO lines are hi-impedance and therefore inactive. The clock line SCL is brought to the device whether it is selected or not. The clock serves as synchronization of the data communication.

The chip select signal CS is optional for a single device system, because you could tie the CS input at the LCD Module low, if the other lines are dedicated to SPI use. This is sometimes called a 3 Wire SPI Interface.

SPI Data transmissions usually involve two shift registers. Most display module applications normally use 8-bit words. However, different size words, such as 12 bit, are also used. By convention, the most significant bit is shifted out of one shift register while the least significant bit is shifted in. The word is then written into memory if the CS (chip-select) is low (active). If not, the data is ignored.

Since the SPI interface protocol is a de facto standard, many variations of the standard protocol are used. For instance, chip manufacturers may use some of the parallel data lines when configuring the IC driver chip for serial communication. chip manufacturers may use some of the parallel data lines when configuring the IC driver chip for serial communication.

I2C uses only two bi-directional lines, Serial Data Line (SDA) and Serial Clock (SCL), which are both typically pulled up with resistors. Typical voltages used are +5 V or +3.3 V. One of the strengths of the I2C interface is that a micro can control multiple devices with just the two I/O pins and software. Because of the I2C design, it is only half-duplex. The interface generally transmits 8-bit words, sending the most significant bit first.

※Controller IC Replacement NoticeDue to the global shortage of IC, the controller RA8876 used in this module has been difficult to purchase. In order not to affect the delivery, we will use the controller LT7683 as replacement which is fully compatible with the same stable performance. (Oct-28-2021)

ER-TFTM101-1 is 1024x600 dots 10.1 "color tft lcd display with RA8876 or LT7683 controller board,Optional capacitive touch panel with controller and resistive touch panel,superior display quality and easily controlled by MCU such as 8051(C51), PIC, AVR, ARDUINO,ARM and Raspberry PI .It can be used in any embedded systems,industrial device,security and hand-held equipment which requires display in high quality and colorful image.Portrait mode is also available.

It supports 8080 6800 8-bit,16-bit parallel,3-wire,4-wire,I2C serial spi interface.Built-in MicroSD card slot.It"s optional for touch panel controller,4-wire resistive touch panel screen. font chip, flash chip and microsd card. We offer two types connection,one is pin header and the another is ZIF connector with flat cable mounting on board by default and suggested.

LCD module is widely used in Healthcare Biomedical Instrumentation,and clinical diagnostics,Wind Sensors for Measurement,Control, Alarm, Internet Access,metering pumps and dosing systems,water treatment ,charging pile and car beauty equipment andIndustrial control equipment, instruments and meters, bank terminal,industry machinery equipment as well as electrical home appliances, consumer electronics including white goods, POS system, home applications, industrial instrument, automation, audio/visual display systems, and medical device ect.

Shenzhen Brilliant crystal Technologic Co.,ltd a professional Character and Graphic LCD manufacturer.graphic LCD displays (liquid crystal display) are available in dot matrix format of graphic resolution including 122x32, 128x64, 128x128, 256x64, 160x128, 160x160, 160x32, 160x80, 192x64,240x128 dots 240x64, 320x240 and etc. The sizes are including 3" LCD, 3.2" LCD, 4" LCD Display, and etc. Graphic LCD modules are including different options of polarizer in reflective, transmissive or transflective types. Our LED backlights are available in various colors including yellow/green, white, blue, red, amber and RGB.

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SPI stands for Serial Peripheral Interface. SPI is a simple serial bus that is often used by LCD or OLED controllers. SPI as implemented for OLED and LCD controllers typically uses a “3-wire SPI” or “4-wire SPI” scheme.

Now you should have been expecting the fourth line to be MISO, so you could read data back from the display–but with LCD controllers, there is a twist.

We need some history to understand the 4th line as used in SPI displays. Traditionally, parallel interface LCD controllers had two registers, a Command register and a Data register. You would write the command to the Command register, then write the appropriate data to the Data register. To select between them, there was a C/D (or A0) line. Set the line to 1=Command or 0=Data then the write the 8 bits of data.

There are some controllers that use the “3-wire SPI” transfer format (encoding C/D and R/W as additional bits in the SPI transfer), but also have a MISO pin that can be used for reading data back from the display. So these displays use 4 physical wires, but have the a data encoding similar to the “3-wire SPI”.

Initially “3-wire SPI” seems like a better solution, less wires, same function, what is there not to like? Well, the same history that gave us the extra C/D line now gives us an extra C/D bit–instead of using 8-bit transfers “3-wire SPI” uses 9-bit (!) transfers.

Each LCD/OLED controller IC that supports SPI will include its specific SPI transfer format, and list the formats for its read and write commands. You will want to look at the format of the controller’s SPI interface and evaluate whether you can use the hardware SPI Master that is part of your microcontroller, or if you need to write your own software SPI master.

This is 8 digital bits serial LED display. It features a flick free display and 3-Wire interface which allows more than 2 modules can be serial linked. With our interface shield, this module can be plug and play.

An important aspect to consider when working with electronic devices is the type of data communication protocol they use. Serial communications are widely utilized in the electronics industry due to their relative simplicity and low hardware requirements compared to parallel interface communications.

RS232 (Recommended Standard 232) is a serial binary data communication standard introduced in 1960. The standard defines pins and signals connecting between a data terminal equipment (DTE) and a Data Communications Equipment (DCE).

The scope of the RS232 standard defines electrical, functional, and mechanical signal characteristics of point-to-point serial data communication between the Data Terminal Equipment (DTE) and the Data Communications Equipment (DCE).

RS232 TTL is a term used to refer to a type of serial communication protocol that uses RS232-type specifications but with logic signals compatible with TTL (transistor-transistor logic) circuits. The voltage levels of TTL serial communication always stay between 0V (logic 0) and Vcc (logic 1, which is typically 3.3V or 5V).

RS232 is no longer the primary standard across consumer products due to existing newer and more advanced technologies like USB. However, the RS232 standard is still used in industrial and commercial applications with simple serial data communication requirements, such as industrial controls, automation equipment, network communications, robotics, and medical equipment.

RS232 is a low-cost serial interface compatible with many new and legacy devices, is easy to implement, has simplified wiring, and has good immunity to EMI. Some of the RS232 disadvantages are low data communication speeds, negative and positive signal voltages can complicate power supply design, limited to single master and single slave, and its unbalanced transmission can be prone to noise.

RS232 is an excellent choice for applications requiring simple, low-speed serial communication. Although the original purpose of the standard was to connect a terminal with a modem, it has been used beyond the scope of its original purpose due to its simplicity and relatively low cost.

HD44780 based character LCDs require at least 6 I/O lines from microcontroller to display data. Therefore, they are not suitable for low-pin microcontrollers like PIC12F series microchips. In this project, I am going to show how to drive an HD44780 based LCD display with only 3 pins of a microcontroller. I am going to demonstrate it with PIC12F683 microchip. The character data and command from the microcontroller is transferred serially to a shift register (74HC595), and the parallel output from the shift register is fed to LCD pins.

In this project, SH_CP and ST_CP are tied together. So, if we want to receive a serially transferred 8-bit into parallel form at Q0-Q7, an extra clock pulse is required after transmitting the 8-th bit of serial data because the clocks are tied and the storage register is 1-clock behind the shift register.

All HD44780 based character LCD displays are connected using 14 wires: 8 data lines (D0-D7), 3 control lines (RS, E, R/W), and three power lines (Vdd, Vss, Vee). Some LCDs may have LED backlight and so they may have additional connections (usually two: LED+ and LED-).

The hardware part of this project is fairly simple. The challenging part is to write the driver software that is responsible for a proper sequence of operations required to serially transfer character data and command to 74HC595 serial-in parallel-out shift register. The shift register parallel output is then connected to LCD data lines (D4-D7) and RS control pin. This arrangement requires 3-pins of microcontroller to display character data on a parallel LCD display: 2 pins for providing Clock and Data to 74HC595, and 1 pin for enable control (E) pin of LCD module. Since the data transfer uses 4-bit mode, any 8-bit command or character data is sent in two steps: send the higher nibble first, and then the lower nibble. The R/W control pin is grounded, and therefore no data or status read from the LCD module is possible in this case.

The SH_CP (11) and ST_CP (12) clock inputs of 75HC595 are tied together, and will be driven by one microcontroller pin. Serial data from microcontroller is fed to the shift register through DS (14) pin. OE (13) pin is grounded and reset pin MR (10) is pulled high. Parallel outputs Q0-Q3 from 74HC595 are connected to D4-D7 pins of the LCD module. Similarly, Q4 output serves for RS control pin. If the LCD module comes with a built-in backlight LED, it can simply be turned ON or OFF through LED control pin shown above. Pulling the LED pin to logic high will turn the back light ON.

A first, a bit of data fed to DS pin of 74HC595 appears at Q0 output after 2 clocks (because SH_CP and ST_CP are tied). So, sending 4-bit data (D4-D7) and an RS signal require 6 clock pulses till they appear at Q0-Q4 outputs respectively. When the LCD module is turned ON, it is initialized in 8-bit mode. A number of initializing commands should be sent to operate the LCD module in 4-bit mode. All the driver routines that are discussed here are written in mikroC compiler. They work only for a 16×2 LCD module. User can modify the initialization operations inside the Initialize_LCD() routine to account for other LCD configurations. The driver routines and their functions are described below.

Write_LCD_Nibble() : Data or command byte is sent to the LCD module as two nibbles. So this function routine takes care for sending the nibble data to the LCD module.

At the beginning of your program, you need to define Data_Pin, Clk_Pin, and Enable_Pin to the chosen microcontroller ports. I am going to demonstrate here how to use these driver routines to display two blinking character strings, Message1 and Message2, at different locations. I am going to test our serial LCD module with PIC12F683 microcontroller. The test circuit is shown below.