The 8051 Friendly board is specifically designed to help students to master the required skills in the area of embedded systems. The kit is designed in such way that all the possible features of the microcontroller will be easily used by the students. The kit supports in system programming (ISP) which is done through serial port.
NXP’s 8051 (AT89V51RD2), 8051 friendly Kit is proposed to smooth the progress of developing and debugging of various designs encompassing of speed 8-bit Microcontrollers.
Liquid Crystal Display also called as LCD is very helpful in providing user interface as well as for debugging purpose. A liquid crystal display (LCD) is a flat panel display that uses the light modulating properties of liquid crystals (LCs). LCD Modules can present textual information to user.
Fig. 1 shows how to interface the LCD to microcontroller. The 2x16 character LCD interface card with supports both modes 4-bit and 8-bit interface, and also facility to adjust contrast through trim pot. In 4-bit interface 7 lines needed to create 4-bit interface; 4 data bits (D0 – D3), three control lines, address bit (RS), read/write bit (R/W) and control signal (E).
Fig. 1 Interfacing 4 bit LCD to Microcontroller
We now want to display a text in 8051 Friendly Board by using 4 bit LCD module.
The 8051 Friendly board has seven numbers of LCD connections are needed to create 4-bit interface; connected with 4 data bits (P0.4 – P0.7, D4-D7), address bit (RS-P0.0), read/write bit (R/W-P0.1) and control signal (E-P0.2) to make LCD display.
The Interfacing 4 bit LCD with 8051 program is very simple and straight forward, which display a text in 2 X 16 LCD module using 4 data lines only. Some delay is occurring when a single command / data is executed.
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