Freescale Semiconductor M68HC08 series Manuale utente

MOTOROLA.COM/SEMICONDUCTORS

M68HC08

Microcontrollers

DRM045/D

Rev. 0

Using the ASB520

Designer Reference

Manual

MC68HC908QT2

Based Infrared

Remote Control

Reference PC Board

9/2003

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Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board DRM045

MOTOROLA 3

Motorola and the Stylized M Logo are registered trademarks of Motorola, Inc.

DigitalDNA is a trademark of Motorola, Inc.

This product incorporates SuperFlash® technology licensed from SST. © Motorola, Inc., 2003

Using the ASB520 MC68HC908QT2 Based

Infrared Remote Control Reference

PC Board

Reference Design

By: Bill Lucas

Motorola Transportation and Standard Products Group

Austin, TX

To provide the most up-to-date information, the revision of our documents on

the World Wide Web will be the most current. Your printed copy may be an

earlier revision. To verify you have the latest information available, refer to:

http://motorola.com/semiconductors

The following revision history table summarizes changes contained in this

document. For your convenience, the page number designators have been

linked to the appropriate location.

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DRM045 Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board

4 Revision History MOTOROLA

Revision History

Date Revision

Level Description Page

Number(s)

September,

2003 N/A Initial release N/A

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Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board DRM045

MOTOROLA Table of Contents 5

Designer Reference Manual — DRM045

Table of Contents

Section 1. Introduction and Setup

1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.2 About this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.3 Setup Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Section 2. Operational Description

2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2 Push Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3 LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3.1 Red Activity Indicator LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3.2 Infrared LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.4 Header and Jumpers Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.5 Microcontroller Current Monitor Jumper Block . . . . . . . . . . . . . . . . . 14

Section 3. Pin Description

3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2 16-Pin Connector J1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Section 4. Schematic and Parts List

4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2 Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.3 Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Section 5. Design Considerations

5.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.2 Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.3 Infrared and Visible LED Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . 21

5.4 Switch Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Section 6. System Testing

6.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.2 Hardware/Software Testing Summary . . . . . . . . . . . . . . . . . . . . . . . 25

6.3 FLASH Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.4 LED and Push Button Test Code . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.5 DVD Player Control Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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DRM045 Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board

6 Table of Contents MOTOROLA

Table of Contents

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Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board DRM045

MOTOROLA Introduction and Setup 7

Designer Reference Manual — DRM045

Section 1. Introduction and Setup

1.1 Introduction

Motorola’s ASB520, MC68HC908QT2 Infrared Remote Control Reference PC

Board and software are designed to demonstrate how a simple, limited

function, dedicated remote control system could be designed. The objective is

to keep the design simple so a user can pick portions of interest to his design

and turn them into an application specific system. This system is specifically

programmed to control an APEX model 1201 DVD player.

A few of the more noteworthy features of the reference PC board are listed as

follows:

• 8-pin MC68HC908QT2 microcontroller

• Infrared LED and driver

• Visible LED to show activity

• Six user push buttons

• MON08 programming interface for in-circuit FLASH programming

• Battery holder for 3-AA cells

• Microcontroller current monitor jumper block

A photograph of the reference PC board appears in Figure 1-1.

1.2 About this Manual

Key items can be found in the following locations in this manual:

• Setup instructions are found in 1.3 Setup Guide.

• Schematics are found in 4.2 Schematic.

• Pin assignments for MON08 connector J1 are shown in Table 3-1.

MON08 Pin Assignments.

• User interfaces are described in 2.3 LEDs.

• For those interested in the design aspects of the reference PC board’s

circuitry, a description is provided in Section 5. Design

Considerations.

• System testing, hardware and software, are described in detail in

Section 6. System Testing.

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DRM045 Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board

8 Introduction and Setup MOTOROLA

Introduction and Setup

Figure 1-1. MC68HC908QT2 IR Reference PC Board Photograph

1.3 Setup Guide

Setup for the reference design PC board can be broken into two parts.

• The first is normal user operation mode.

• The second is MC68HC908QT2 FLASH programming configuration.

FLASH programming is explained in Section 6. System Testing.

It is assumed for user operational mode, the MC68HC908QT1 has been

programmed with the remote control program. If not, refer to Section 6.

System Testing for FLASH programming information.

Figure 2-1. PC Board shows the locations of the various jumper blocks and

MON08 connector.

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Introduction and Setup

Setup Guide

Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board DRM045

MOTOROLA Introduction and Setup 9

For user operation mode, shorting jumpers need to be installed to jumper

blocks JP1–JP4. Shorting jumper block JP1 is not necessary if the small PC

board trace under jumper block JP1, on the bottom side of the PC board, has

not been cut for microcontroller current monitoring.

Installation of 3-AA Alkaline batteries into the battery holder mounted on the

bottom of the PC board is also required for setup. Note battery polarity on the

battery holder. The PC board is now ready for use as an infrared remote

control.

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DRM045 Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board

10 Introduction and Setup MOTOROLA

Introduction and Setup

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