Motorola M68HC08 User manual

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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Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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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
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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Designer Reference Manual DRM014 — Rev 0
4MOTOROLA
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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DRM014 — Rev 0 Designer Reference Manual
MOTOROLA Table of Contents 5
Designer Reference Manual — DRM 14
Table of Contents
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
6
5
3
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
Q
Z
5
F1
W
X
T
+
= F2
E
C
Bck
Spc
R
V
B
[ {
~
`
A
6] } TAB
2S
Y
“
‘
SPC
3D
H
<
,
N
F9
PTB PTB1 PTB2 PTB3 PTB4 PTB5 PTB6 PTB7 PTC PTC1 PTC2 PTC3 PTC4 PTC5 PTC6 PTC7 PTE
F
F3
F4
F5
F6
F7
F8
F1
F11
F12
INS DEL
Num
Lck
|
\
Prnt
Scr
Scrl
Lck Pause
App
89
UIO P
7
KL :
;
ENTM
>
.
Lctrl
J
4
9
*
4
56
7
23
+
ENT
.
/
1
Home Page
Up
Page
Down
End
RCTRL
PWR
Dwn
SLEEP
WAKE
RALT
LSFT
RSFT
LGUI
PTE2
Caps
Lck
RGUI
LALT
_
-
8
1
?
/
G
PTA
PTA1
PTA2
PTA3
PTA4
PTA5
PTA6
PTA7
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