Interfacing Nokia 5110 Display to 8051 Micro Controller

In this article, we are publishing a project which explains different aspects of interfacing a Graphical LCD (GLCD ) with 8051 microcontroller. Nokia 5110 is a  48 x 84 graphic LCD that has an internal controller PCD8544 to control all displays and operations. The Nokia 5110 is interfaced to the microcontroller through a serial bus interface. After going through the project you can display the graphics or text you wish to be displayed. So lets begin our tutorial and learn how to interface a graphical LCD like Nokia 5110 Display to the 8051 micro controller. So let’s come to our project! Objectives of the Project Understanding the basics of Nokia 5110 GLCD. Serial Bus interfacing of GLCD with 8051. Generating code for displaying the graphics or text you need to display. Let’s begin to build our project! Circuit Diagram   Assemble the circuit as shown in the diagram! Component and connections are explained below Nokia 5110  Specifications 48 x 84 Graphic LCD Display Serial Bus Interface Internal Controller – PCD8544 LED Back-Light Supply Voltage 2.7 -5.0 Volt Low power consumption Connections Explained GND =>  Ground Pin | Connect to  8051 GND BL =>   Pin to control  LED (Back Light) | Connect to 3.3V VCC =>   Power Supply Pin from  7 – 5 V | Connect to 3.3V CLK =>   Pin Clock (Serial Clock Line for SPI communication) |  Connect to P2^1 of 8051. DIN =>   Pin Data (Serial Data Line for SPI communication) | Connect to P2^2 of 8051. DC  =>   Pin to select Command or Data mode for data formats | Connect to P2^3 of 8051. CE   =>   Chip enable input. The enable pin allows data to be clocked in. The signal is active LOW. | Connect to P2^4 of 8051. RST =>   External reset. This signal will reset the device and must be applied to properly initialize the chip. The signal is active LOW. |  Connect to P2^5 of 8051. The Program/Code The program is written in embedded C language. The important aspects and subroutines of the program are explained below. Download the Program At the beginning of the program, a header file named “reg52.h” is included. It is a header file for generic 80C52 and 80C32 microcontroller. You can replace it with the header file of your controller which comes under 8051 family. After that, you can see two large arrays named “CircuitsTodayLogo” and “LookUpTable”.  First one is for displaying circuitstoday logo (as you can see in the header area of this website).  And the latter is for writing normal text. You can replace the first one with the array of your own logo. Array for your logo can be generated by simply uploading the logo image in the following link. http://ift.tt/2uancQl As mentioned earlier the signal connection for controlling operation of LCD is the Serial format. Command mode and Data mode are the two modes that are used for communicating with LCD. The DC pin of the LCD is used for selecting the mode. if DC = 0, the data that is sent to the LCD is Command and if DC = 1, the data that is sent to LCD will be Data and it will be placed in DDRAM Memory (Display Data RAM) to be displayed on LCD Display. The value of DDRAM will be incremented automatically after writing 1 byte into it. While sending each byte, the MSB will be sent first. A subroutine named  “Send()” is using here for sending bytes to the LCD. Data will be shifted to Din pin during every rising edge of the signal clock. “Data()” and “Cmd()” are the subroutines...
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