LCD 16x2datasheet

The RW pin or the Read / Write Pin is used for selecting Read Mode or Write Mode. When RW is HIGH, read mode is selected and data is read from the register. When RW is LOW, write mode is selected and data can be written in to the register.

There are 8 data pins for transmitting 8 – bits of data i.e. 1 byte of data at a time. The LCD can be used in either 8 – bit mode or 4 – bit mode. In 4 – bit mode, only 4 of the 8 data lines will be utilized for transmitting the data.

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The remaining three pins i.e. RS (Pin 4), RW (Pin 5) and E (Pin 6) are called the Control Pins and are very important pins.

Lcd1602 datasheet

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The above table seems confusing and is difficult to understand. Hence, the following table will give you a simplified list of LCD commands and their respective functions.

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From the circuit diagram, the four data pins of the LCD (D4 – D7) are connected to P0.17 to P0.20 pins of the LPC2148. The control pins RS and E are connected to P0.12 and P.13 pins of the LPC2148 MCU.

LCD 16X2pin diagram

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While interfacing the 5V LCD module with a 3.3V MCU like a LPC2148, there is a chance that the connection might work if connected directly. In this case, we need to use a Level Shifter IC as an intermediate module between the MCU i.e. LPC2148 and the LCD Module.

Important Note: The ARM7 MCUs and in particular the LPC2148 MCU works on a 3.3V supply. The ARM7 development board used in the project has a separate 5V supply for the LCD module and doesn’t draw any power from the MCU.

The most common type of 16 x 2 LCD display available in the market is JHD162A with either HD44780 or KS0066U Display Controller. HD44780 is manufactured by Hitachi and KS0066U is manufactured by Samsung. Both the controllers are compatible with each other.

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/* Function definition of the LCD initializing function. The commands to initialize the LCD Module are given using this function */

There is also a tradeoff of using the 4 – bit mode in LCD. Since only 4 – pins are used, we can send only 4 – bits of data at a time. Hence, in order to send a byte of data, the time will be taken will double that of an 8 – bit mode.

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It is clear from the circuit diagram that the LCD is used in 4 – bit mode. The advantage of using 4 – bit mode in LCD is it requires only 4 pins from the microcontroller, which is very important in resource intensive applications.

After connecting the LCD module as per the circuit diagram, the first step is to initialize the LCD module. For that, we need to use some of the commands for the LCD in our program. The following table shows a list of commands used for configuring the LCD Module and also their respective functions.

If the number of I/O pins on a MCU are limited and timing is not an issue, then we can go for 4 – bit mode. Also, the 4 – bit mode requires additional lines of code for shifting the data in the lower nibble to higher nibble every time we send an instruction or data.

16x2 LCDdisplay

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/* Function definition of display function. It is used to send the actual data to the LCD module. Hence, the RS pin is set to HIGH*/

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As we have seen in the previous tutorial how to setup the PLL so that the CPU clock is running at 60 MHz (maximum for LPC2148), we will include that in this code as well. The steps for writing the programming the LCD interface with LPC2148 will be as follows.

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ArduinoLCD

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The RS pin, which is short for Register Select pin, is used to select either Instruction Register when it is LOW or Data Register when it is HIGH.

The Enable (E) pin, as the name indicates, is used to enable the execution of the data or instructions. The data or instruction are executed by the LCD module only when a HIGH to LOW pulse is given to the Enable pin i.e. only on the falling edge of a pulse.

The next important project after Blinking LEDs with any microcontroller is to display characters on a LCD. In this project, we will see how to interface a LCD with LPC2148 Microcontroller and when we say LCD, a 16 X 2 Alphanumeric LCD module to be specific.

The commonly used level shifter is HEF4050B, which is a Hex non – inverting buffer. It can be used to convert logic levels to standard TTL levels. There are other buffers or Level Shifters in 74 series if ICs.

1602LCD

If there is a suspicion of a potential incident, the product must always be sent in as a complaint. A simple repair order is not permitted in this case.

/* Function definition of cmd function. It is used to send initializing commands to the LCD module. Hence, the RS pin is set to LOW. Also the code is written two times: once the 4 bits are received, they are shifted and the next 4 bits are captured*/

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Before going to the actual project, we will discuss a few things about 16 x 2 LCD display. A LCD display or liquid crystal display is a display module with liquid crystals and backlight by LEDs. A 16 x 2 LCD display consists of two rows of display with each row consisting of 16 characters.

Out of these commands, we are going to five commands in our project. They are listed below along with their function in the project.

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From the pin configuration, it is clear that the pins can be sorted according to Power pins, control pins and data pins. Power pins i.e. pins 1, 2, 3, 15 and 16 are used to supply for the module as well as the backlight LEDs. The voltage to the Contract Adjust Pin (Pin 3 or VEE) is usually given from a Potentiometer and will control the contrast of the actual display when the POT is adjusted.