Motorola M68HC08 Manual de usuario

MOTOROLA.COM/SEMICONDUCTORS

M68HC08

Microcontrollers

DRM014/D

Rev. 0.0, 3/2003

USB and PS/2

Designer Reference

Multimedia Keyboard

Manual

Interface

Reference Design

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DRM014 — Rev 0 Designer Reference Manual

MOTOROLA 3

USB and PS/2 Multimedia

Keyboard Interface

Reference Design

Designer Reference Manual — Rev

by: Derek Lau

Motorola Lt

Hong Kong

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Designer Reference Manual DRM014 — Rev 0

4MOTOROLA

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DRM014 — Rev 0 Designer Reference Manual

MOTOROLA Table of Contents 5

Designer Reference Manual — DRM 14

Table of Contents

Section 1. USB and PS/2 Multimedia Keyboard Interface

1.1 Intro uction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

1.2 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

1.3 44-pin QFP MC68HC908JB8 Features . . . . . . . . . . . . . . . . . . .8

1.4 Har ware Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

1.5 Firmware Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

1.6 Firmware Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

1.7 Test Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

1.8 Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

1.9 Extra Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

1.10 Further Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

1.11 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Section 2. Glossary

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Table of Contents

Designer Reference Manual DRM014 — Rev 0

6 Table of Contents MOTOROLA

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DRM014 — Rev 0 Designer Reference Manual

MOTOROLA USB an PS/2 Multime ia Keyboar Interface 7

Designer Reference Manual — DRM 14

Section 1. USB and PS/2 Multimedia Keyboard Interface

1.1 Introduction

This manual escribes a reference esign of a Universal Serial Bus an

PS/2 multime ia keyboar interface for Microsoft Win ows by using the

MC68HC908JB8.

For the full MC68HC908JB8 specification, please refer to the ata sheet,

Motorola or er number: MC68HC908JB8/D.

1.2 Overview

The Motorola MC68HC908JB8 is a member of the HC08 Family of

microcontrollers (MCUs). The features of the MC68HC908JB8 inclu e a

configure Universal Serial Bus (USB) or PS/2 interface, which makes

this MCU suite for personal computer Human Interface Devices (HID),

such as mice an keyboar s. The MC68HC908JB8 is available in

several packages to fit into various applications. A multime ia keyboar

with USB an PS/2 interface is emonstrate using the MC68HC908JB8

with a 44-pin QFP package. The main features of the keyboar inclu e:

• Fully USB specification 1.1 compliant

• USB or PS/2 interface auto etect

• Win ows 98, ME an 2000 compatible

• Power management keys (power, wake an sleep) support

• Multime ia key support

• In-circuit programming for firmware mo ification

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USB and PS/2 Multimedia Keyboard Interface

Designer Reference Manual DRM014 — Rev 0

8 USB an PS/2 Multime ia Keyboar Interface MOTOROLA

1.3 44-pin QFP MC68HC9 8JB8 Features

The 44-pin QFP MC68HC908JB8 is targete for USB an PS/2 interface

keyboar applications with minimum external components nee e .

Features inclu e:

• USB D+ an D– pins share with PS/2 ata an clock pins

• 27 out of 37 I/O pins with internal pull-up supports up to 8x19 key

matrix

• 10mA irect rive pins for the Num Lock, Caps Lock an Scroll

Lock LEDs

• Internal 1.5K pull-up for USB D– ata line

• Internal 5K pull-ups for PS/2 ata an clock pins

1.4 Hardware Descriptions

Figure 1-1. Block Diagram

Figure 1-2. USB and PS/2 Connections

MC68HC908JB8

8 x 18

Key Matrix

Scroll LED

Caps LED

Num LED

USB Plug

USB Plug USB to PS/2

Converter 12 4

PS/2 Plug

6-pin PS/2 Plug

1 – Data (USB D– pin)

2 – NC

3 – Ground (USB Ground)

4 – +5V (USB +5V)

5 – Clock (USB D+ pin)

6 – NC

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USB an PS/2 Multime ia Keyboar Interface

Har ware Descriptions

DRM014 — Rev 0 Designer Reference Manual

MOTOROLA USB an PS/2 Multime ia Keyboar Interface 9

Figure 1-1 shows the block iagram of the keyboar . The solution

inclu es the JB8, key button inputs an LED in icator outputs only. The

connections of the correspon ing USB an PS/2 signals are shown in

Figure 1-2. The USB to PS/2 converter stan ar connections are the

USB D– an D+ pins connecte to the PS/2 Data an Clock pins

respectively.

Figure 1-3 shows the printe circuit boar an Figure 1-16 shows the

schematic of the keyboar .

• J1 is use for USB connection

• J2 is use for PS/2 mouse connection (for future evelopment)

• J3 an J7 are use for in-circuit programming

• 8 rows x 18 columns key matrix is implemente

– 8 rows implemente in PTA[7:0]

– 18 columns implemente in PTB[7:0], PTC[7:0], PTE0 an

PTE2

• Keyboar LEDs

– Scroll Lock at PTD2

– Caps Lock at PTD3

– Num Lock at PTD4

Figure 1-4 shows the key matrix for the 107 stan ar keyboar with

power management keys (Power, Wake an Sleep). Figure 1-5 shows

the key matrix for multime ia keyboar with function key.

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USB and PS/2 Multimedia Keyboard Interface

Designer Reference Manual DRM014 — Rev 0

10 USB an PS/2 Multime ia Keyboar Interface MOTOROLA

Figure 1-3. Keyboard PCB

1.4.1 Key Matrix

Figure 1-4. 1 7-Key Matrix

ESC

= F2

Bck

Spc

[ {

6] } TAB

“

‘

SPC

PTB PTB1 PTB2 PTB3 PTB4 PTB5 PTB6 PTB7 PTC PTC1 PTC2 PTC3 PTC4 PTC5 PTC6 PTC7 PTE

F11

F12

INS DEL

Num

Lck

Prnt

Scr

Scrl

Lck Pause

App

UIO P

KL :

;

ENTM

Lctrl

ENT

Home Page

Page

Down

End

RCTRL

PWR

Dwn

SLEEP

WAKE

RALT

LSFT

RSFT

LGUI

PTE2

Caps

Lck

RGUI

LALT

PTA

PTA1

PTA2

PTA3

PTA4

PTA5

PTA6

PTA7

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