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w w w . d ig i l en t inc . c om

Revision: December 14, 2007

Note: This document applies to REV D-E of the board.

215 E Main Suite D | Pullman, WA 99163

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Doc: 502-092

page 1 of 4

Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

Overview

The PmodCLS module can be used to display

important information during program

development or as a user interface after the

project has been completed. The module is

ideally suited for projects that include a Digilent

embedded-AVR board, but can also be used in

projects using a Digilent FPGA board.

The module is capable of executing a variety of

instructions, such as erasing specific

characters, setting different display modes,

scrolling, and displaying user-defined

characters. These instructions are specified

using escape sequences to send commands to

the board’s embedded Atmel ATmega48

microcontroller. The display on the module is

driven by this AVR and controls all of the

features of the board.

Functional Description

Communication with the embedded AVR on

the PmodCLS is established using a UART,

SPI, or TWI (Phillips I²C compatible) serial

connection. Characters are written to the

display simply by sending characters over the

communication link. The characters appear on

the display at the current location of the

board’s cursor.

You set the cursor location, and send other

instructions, by sending escape sequences. An

escape sequence is specified by first sending

the escape character followed by a left square

bracket ‘[‘, zero or more numeric parameters

separated by semicolons ‘;’ followed by the

command character for the specific command..

All of the possible instructions are listed in the

”Instruction Set” section, below.

LCD

DISPLAY

ATmega48

DAISY-

CHAIN

8

3

JI

SPI/

ISP

J2

TWI/

UART

TWI

7.3728MHz

Crystal

DATA

CTL

5V

BOOST

REGULATOR

4K Flash

(Internal)

256 EEPROM

(Internal)

512 SRAM

(Internal)

Internal

Oscillator

UART, SPI,

&TWI ports

4

4

2

PmodCLS Block Diagram

Communication Options

You can set the board’s communication

method by setting the mode jumpers MD0,

MD1, and MD2 on the board. Possible mode

jumper configurations are listed in the table

below. For Rev D boards, a missing jumper is

represented by 0 and a connected jumper is

represented by 1. For Rev E boards, a missing