Analog Devices AN-645 Interfacing HD44780 LCD to MicroConverter Application Note

About this manual

This document details the interfacing of an HD44780 standard character LCD to the MicroConverter microcontroller. It specifies the required 11-pin connection, including eight data lines (DB0-DB7) connected to Port 0 and three control lines (EN, RS, RW) connected to specific ports. The text explains the function of each control line for data transmission and command execution.

What's inside

• Introduction
• Interfacing an HD44780 LCD
• Configuring the LCD Screen
• Writing Text to the LCD Display
• Sample Programs
• Assembly Code Examples

Frequently asked questions

How many pins are required to interface an HD44780 LCD to a MicroConverter?

A total of 11 pins is needed, consisting of an eight-bit data bus and three control lines.

What command value configures the LCD for an 8-bit data bus and 5 x 10 dot font?

The value 38H must be sent to the LCD controller to achieve this configuration.

What text example is used in the sample program to demonstrate writing to the display?

The sample program writes 'ANALOG DEVICES' and 'LCD EXAMPLE CODE' to the screen.