Analog Devices EE-37 How to Interface an LCD to the 21xx and 2106x Family DSP

About this manual

This document describes how to interface an Optrex dot-matrix type LCD module to the ADSP21xx and ADSP2106x family digital signal processors. It details a hardware design using a CMOS octal D-type flip-flop (74HC574) to compensate for timing differences between the DSP and the slower LCD micro-controller. The design supports 4-bit data transfers and covers various display functions such as clear display, cursor control, and shifting.

What's inside

• Introduction
• Hardware Interface
• Software
• ADSP 21xx Code
• ADSP 2106x Code

Frequently asked questions

What type of LCD modules can be interfaced with these DSPs?

The document covers Optrex dot-matrix type LCD modules ranging from 16 characters by one line to 40 characters by four lines.

What hardware component is required between the DSP and the LCD?

A CMOS octal D-type flip-flop, specifically model 74HC574, must be used to interface the two devices.