EPE PIC/LCD Demo using PIC16F877 with Proteus Simulation

Introduction

The EPE PIC/LCD Demo is a classic microcontroller project that demonstrates how a PIC16F877 can fully control a PG12864F graphical LCD.
Designed as a hands-on learning example, this project shows how text, graphics, animations, and custom symbols can be generated directly from firmware.
It is especially useful for anyone learning embedded systems, graphical LCD interfacing, and Proteus simulation without needing physical hardware.
Using MPASM and Proteus VSM, the project explores real-world LCD control techniques in a clear, visual way.
This makes it an excellent reference for DIY electronics, display drivers, and low-level firmware development.

How the Project Works (Overview)

The PIC16F877 communicates with the PG12864F graphical LCD using parallel data lines and dedicated control signals.
The firmware initializes the LCD, sets up text and graphics memory areas, and then cycles through multiple demonstration routines.
Each demo highlights a different LCD capability such as pixel-level drawing, cursor control, page switching, waveform rendering, and animation.
A push-button input allows the user to move between demos during runtime.
All timing, display updates, and screen effects are handled entirely by the microcontroller firmware.This PIC16F877 LCD Proteus demo shows how a PIC16F877 microcontroller interfaces with a graphical LCD using Proteus simulation. The PIC16F877 LCD Proteus demo is ideal for learning embedded systems and LCD interfacing.

Block Diagram / Workflow Explanation

1. Power-Up & Initialization

   • PIC16F877 configures ports and LCD control pins

   • LCD is reset and display mode is selected

2. LCD Configuration

   • Text area and graphic area addresses are set

   • Character generator (CG RAM) is initialized

3. Demo Execution Loop

   • Firmware runs multiple display demonstrations sequentially

   • Button input determines when to move to the next demo

4. Graphic & Text Rendering

   • Data is written directly to LCD memory

   • Pixels, symbols, text, and animations are generated

5. Continuous Operation

   • Demos repeat in a loop for continuous visualization

Key Features

• Full graphical LCD control using PIC16F877

• Text and graphics rendering on PG12864F display

• Multiple built-in LCD demonstrations

• Custom character generation (CG RAM usage)

• Pixel-level drawing and bit manipulation

• Page switching and display panning

• Animated waveforms and graphics

• Button-controlled demo navigation

• Designed for Proteus VSM simulation

Components Used

• PIC16F877 microcontroller

• PG12864F graphical LCD module

• Push-button switch

• Crystal oscillator

• Resistors and capacitors

• Power supply connections

Applications

• Learning graphical LCD interfacing

• Embedded systems education and training

• Firmware development practice with MPASM

• Display driver prototyping

• LCD animation and visualization demos

• Simulation-based electronics learning

• Reference design for PIC-based display projects

Explanation of the Code (High-Level)

The firmware is written in MPASM assembly language and structured into reusable subroutines.
Initialization routines configure ports, LCD modes, and memory addressing.
Dedicated routines handle command writing, data writing, screen clearing, and cursor positioning.
Each demo routine showcases a specific LCD capability, such as drawing shapes, scrolling pages, or rendering waveforms.
EEPROM data and CG RAM are used to create custom symbols and animations.
The modular design makes it easy to extend or modify the demos.

Source Code

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; CONVERTED TASM PIC16F877 C:\PIC\GEPE456.ASM TO MPASM C:\ASMCNV\GEPE456.ASM 01-22-2001	22:15:32

	list p=16F877,r=dec
			    ;GEPE456.ASM 07SEP00 - JOHN	BECKER - EPE LCD GRAPH DEMO 2 (MAIN DEMOS)
			    
#DEFINE	  PAGE0	BCF H'03',5;STATUS bit 5
#DEFINE	  PAGE1	BSF H'03',5;STATUS bit 5
			    
INDF	  EQU H'00'	    ;page 0, 1,	2, 3
OPSHUN	  EQU H'01'	    ;page 1, 3
PCL	  EQU H'02'	    ;page 0, 1,	2, 3
STATUS	  EQU H'03'	    ;page 0, 1,	2, 3

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Complete Source Code

Proteus Simulation Behavior

In Proteus VSM, the PIC16F877 runs exactly as real hardware would.
The graphical LCD displays text, symbols, and animations in real time.
Pressing the simulated switch advances through different LCD demos.
Waveforms, scrolling graphics, and custom characters are clearly visible, making the simulation ideal for learning and debugging.

Conclusion

The EPE PIC/LCD Demo using PIC16F877 is a powerful learning project that demonstrates professional-level graphical LCD control using a classic PIC microcontroller.
It combines low-level firmware techniques with rich visual output, making it ideal for embedded systems practice.
Whether used for simulation, education, or experimentation, this project provides strong insight into how graphical displays are driven at the hardware level.

Complete File

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EPE PIC/LCD Demo using PIC16F877 with Proteus Simulation