Because we are using a 16Г—2 LCD as an output device only. Similarly, when this pin is set to active low, we will be able to write data to the LCD. When this pin is set to active high, LCD will be in read mode which means we can read data from the LCD. On the contrary, when we want to send data to LCD, we provide active high signal to this pin from TM4C123 microcontroller Read/Write (R/W)ДЄs its name suggests, R/W is used to select read or write mode of LCD. These commands are setting cursor position, cursor on or off, scrolling text left or right, clearing text from LCD, etc. In other words, it helps to differentiate between data and commands.ДЇor example, when we want to send commands to LCD from TM4C123 microcontroller, we set this pin active low by sending an active signal from the GPIO pin of Tiva Launchpad. Register Select (RS) : With the help of this pin, TM4C123 microcontroller informs the LCD controller either we are sending commands or data to LCD. This contrast can be set through by using a potential divider circuit with a variable resistor. LCD Contrast (Vo) : It is used to adjust the contrast of LCD with respect to text display. But this LCD can be used either in 4-bit (only D0 to D3 pins are used) or 8-bit mode( all D0 to D7 pins are used). Hence, these lines will be connected with TM4C123 GPIO pins to transfer data. Pins D0 to D7 are data pins which are used to send data to be displayed or commands to LCD controller.

It consists of 16 pins such as data, control, power supply, and backlight LED pins. LetвЂ™s first discuss the pin details of LCD.

Tm4c analog semaphor bit