Motorola M68HC08 Bedienungsanleitung

MOTOROLA.COM/SEMICONDUCTORS

M68HC08

Microcontrollers

DRM055/D

Rev. 0

1/2004

High Data Rate

Wireless USB

Optical Mouse

Solution Using the

MC68HC908QY4

and MC68HC908JB12

Designer Reference

Manual

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High Data Rate Wireless USB Optical Mouse Solution DRM055

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.

All brand names and product names appearing in this document

are registered trademarks or trademarks of their respective holders. © Motorola, Inc., 2004

High Data Rate Wireless USB Optical Mouse

Solution Using the MC68HC908QY4

and MC68HC908JB12

Designer Reference Manual

by: Dennis Lui

Ernest Chan

Applications Engineering

Motorola Microcontroller Division

Hong Kong

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

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DRM055 High Data Rate Wireless USB Optical Mouse Solution

4 Revision History MOTOROLA

Revision History

Date Revision

Level Description Page

Number(s)

January,

2004 N/A Initial release N/A

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High Data Rate Wireless USB Optical Mouse Solution DRM055

MOTOROLA Table of Contents 5

Designer Reference Manual — DRM055

Table of Contents

Section 1. System Overview

1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.3 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.4 Transmitter and Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Section 2. RF Front End

2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.3 RF Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.4 RF Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.5 PCB Layout Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Section 3. Universal Serial Bus (USB) Overview

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

3.2 JB12 USB Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2.1 USB Module Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.2.2 USB Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.2.3 USB Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Section 4. Optical Mouse Transmitter

4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.2 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.2.1 QY4 Microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.2.2 Optical Mouse Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Section 5. Mouse Transmitter Firmware

5.1 Firmware Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.2 Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.3 Data Packet Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.3.1 Coding Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.3.2 Packet Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.3.3 Button Status and Z Displacement Packet . . . . . . . . . . . . . . . . . 24

5.3.4 X-Y Displacements Packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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DRM055 High Data Rate Wireless USB Optical Mouse Solution

6 Table of Contents MOTOROLA

Table of Contents

Section 6. Universal Serial Bus (USB) Receiver

6.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.2 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Section 7. Receiver Firmware

7.1 Firmware Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.2 USB Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.3 Remote Wakeup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.3.1 Wakeup Detection Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.3.2 Power Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7.4 ID Updating Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Section 8. Testing and Customization

8.1 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

8.2 Hardware Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

8.2.1 Optical Mouse Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

8.2.2 RF Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8.3 Firmware Customization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8.3.1 Mouse Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8.3.2 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

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High Data Rate Wireless USB Optical Mouse Solution DRM055

MOTOROLA List of Figures and Tables 7

Designer Reference Manual — DRM055

List of Figures and Tables

Figure Title Page

1-1 System Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3-1 USB Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3-2 USB Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3-3 USB Packet Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4-1 Transmitter Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5-1 Firmware Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5-2 Power Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5-3 Manchester Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5-4 Packet Format for Button and Z Displacement . . . . . . . . . . . . . . . 24

5-5 Start Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5-6 Button Status Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5-7 Z Displacement or ID Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5-8 Checksum Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5-9 Packet Format for X-Y Displacements. . . . . . . . . . . . . . . . . . . . . . 25

5-10 Start Field for X-Y Displacement Packet . . . . . . . . . . . . . . . . . . . . 25

6-1 USB Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7-1 Firmware Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7-2 USB Interrupt Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7-3 Setup Routine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7-4 OUT EP0 Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7-5 IN EP0 Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7-6 Timer Capture Interrupt For Receiver . . . . . . . . . . . . . . . . . . . . . . 34

7-7 Timing Parameters for Packet Detection . . . . . . . . . . . . . . . . . . . . 36

7-8 Detection of Valid Wakeup Packets. . . . . . . . . . . . . . . . . . . . . . . . 36

7-9 JB12 Rejecting Packet-Like Noise

to Prevent False Wakeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

8-1 USB Report for JB12 to Host for the Test Setup . . . . . . . . . . . . . . 40

8-2 Loop Antenna Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

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DRM055 High Data Rate Wireless USB Optical Mouse Solution

8 List of Figures and Tables MOTOROLA

List of Figures and Tables

Table Title Page

7-1 Interface 1 Mouse Input Report . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

8-1 Tx Matching Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8-2 Rx Matching Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

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High Data Rate Wireless USB Optical Mouse Solution DRM055

MOTOROLA System Overview 9

Designer Reference Manual — DRM055

Section 1. System Overview

1.1 Introduction

This manual describes a reference design for a high data rate wireless

universal serial bus (USB) optical mouse solution by using the

MC68HC908QY4 and the MC68HC908JB12.

Because of the lower cost, adoption of wireless PC peripherals has been fast

paced. Consumers are quickly recognizing the advantages of using wireless

PC peripherals, which include portability and placement flexibility. However,

there are two major performance issuesin general 27-MHz wireless platforms.

These issues affect wireless mouse applications in particular.

1. The mouse cursor motion tracking speed is slow

2. There is a long legacy time in response to an end-user action

These issues can be resolved by implementation of a new high-speed

transmission link. The tracking speed of the high data rate wireless mouse is

almost doubled and the response time is reduced by half. The performance is

even compatible to a corded mouse in terms of data report rates uploaded to

the PC host from the peripheral device. From the end users point of view, the

overall movement of the mouse can be fully cached up and reflected on the

computer screen without any noticeable delay in cursor response.

The following reference materials are available at:

http://motorola.com/semiconductors

• Schematic diagram

• PCB layout

•PCBGerber

• Bill of materials

• Source code

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DRM055 High Data Rate Wireless USB Optical Mouse Solution

10 System Overview MOTOROLA

System Overview

1.2 Features

Main features of the mouse include:

• A high data rate 27-MHz RF link

• Windows® 98, Windows 2000, and Windows XP compatibility

• User identity code to avoid conflict with other devices

• USB 2.0 low-speed compliance

• 4.8 kbps transmission data rate

• 2 meter communication distance

• 3361 compatible device for RF receiver design

1.3 System Overview

The system consists of:

• A high data rate wireless optical mouse using the MC68HC908QY4

(hereafter referred as QY4)

• A USB receiver using the MC68HC908JB12 (hereafter referred as

JB12).

The QY4 was chosen as the mouse transmitter because it includes:

• An internal oscillator circuit

• An auto wakeup function

The JB12 is suitable for this high data rate wireless optical mouse application

because it has:

• 12-K FLASH memory

• 6-MHz bus processing power

• USB function

• An enhanced timer capture module

NOTE: The traditional track-ball type X-Y detection method was replaced by the

advanceopticalnavigationtechnologythatservesasa non-mechanical motion

estimation.

A block diagram of the system is shown in Figure 1-1.

Windows is a registered trademark of Microsoft Corporation in the United States and other

countries.

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