But by smart thinking, we can reduce it to six. So it needs 11 pins of controller for operation. So ASCII of 0 is 48, of 1 is 49 etc.Īs provided earlier, LCD has 8 data pins and 3 control pins. To convertĪny number into ASCII, we must add 48 decimal value to it. [Courstey: So to display any character on LCD, we must provide ASCII value of that on data pins and LCD is smart enough to do the rest. While operating in data mode, we must keep in mind that the pattern to be displayed on dot matrix is already stored in internal memory of LCD. Data Mode: In this mode, RS pin is at logic 1 and data op pin 7-14 represents the data to be displayed on LCD. Command Mode: In this mode, RS pin is at logic 0 and the data on pin 7-14 represents the command which specifies the actions to be performed like clear LCD, go to home position, blink cursor etc.Ģ. Once you are aware of command structure, let’s move ahead.ġ. Well to reduce your efforts, generally required commands are short listed here. This table must be understood properly for programming. To configure LCD, we must know the command structure which is as given below. It has total 16 pins which can be divided into three categories. China made JHD 162A 16*2 LCD is widely used and easily available in market. The entire article aims to cover basics of LCD and level shifter circuit designing with programming to interface LCD with LPC 2148.

This requires level shifter circuit to be interfaced. LCD operates on 5V but LPC 2148 operates on 3.3V so we have to take care of this fact for the controller pins which has to be connected with LCD. Interfacing of LCD with LPC2148 differs little bit compared to interfacing with 8051 or AVR which operates on 5V. Almost all embedded product requires LCD.Īdvantage of LCD over LEDs is its ability to display any number, alphabet, special characters and user defined symbol (at extra effort for programming) without increasing number of pins required to be connected with controller. It is one of the widely used modules in embedded system.

LCD stands for Liquid Crystal Display used to display numbers, strings and special characters as per the application.

Lcd display lpc2129