LCD Module Interface with PIC16F877A
This article describe the hardware setup required for interfacing HD44780 based alphanumeric LCD modules with a PIC16F877A microcontroller. The software part consisting of the LCD library for PIC, its setup and use with MPLAB X IDE and XC8 compiler are described in a separate article. LCD Library for PIC – Setup on MPLAB X IDE A common controller chip used in many alphanumeric LCD module is the HD44780. The purpose of the controller is to generate pixel patterns and drive individual pixels of the LCD to show characters and symbols. In this method the main microcontroller running your application code does NOT need to generate the pixel patterns, it just need to tell the controller chip which character or symbol to show the rest is done by the controller, i.e. the HD44780. The same controller chip is used in many differently sized alphanumeric LCDs. Thus the connection schematic and driving code is same. Pin Details of LCD Module All HD44780 based LCD modules have 16 pin connecters. The detail about these pins is given below. Interface pins of LCD Module Pin Number Pin Name Pin Type Connected with PIC16F877A’s pin 1 VSS Power Supply – 2 VCC Power Supply – 3 VEE Contrast Adjust – 4 RS Control Line RD4 5 R/W Control Line RD5 6 E Control Line […]