Datasheet HT82K628A Datasheet (Holtek Semiconductor Inc)

HT82K628A

Preliminary

Windows 2000 Keyboard Encoder

Features

Design for Windows 95/98/2000/NT

·

Supports WindowsTMkeys

·

Supports PC/AT and PS/2 code set 1, 2, 3

·

Supports Japanese , Korean , Brazilian and

·

European
RC oscillator

·

Phantom key detection

·

Low power consumption

·

General Description

The HT82K628A is a keyboard encoder de
signed for IBM PC/AT, IBM PS/2 and all com
patible machines.

The HT82K628A accepts keyboard inputs and
provides a 16-character first-in-first-out buffer
in which data is stored.

101/102/104/109 keys or other special

·

application keyboard encoder
8 external hot keys

·

Supports Mini-keyboard and Internet/Mul

·

timedia keyboard
WINDOWS is a registered trademark of

·

Microsoft corporation
40-pin DIP/DICE form package

·

An inexpensive RC oscillator can be used for

­the system clock. Simple implementation of

­this device is an advantage for high perfor
mance and low cost keyboard applications.

-

-

1 July 20, 2000

Pin Assignment

Preliminary

HT82K628A

R5

R4

C3

C2

C1

C0

R3

R2

R1

R0

R19

R18

R17

R16

VSS

SCR OLL

NUM

DATA

CLOCK

Fn Select

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

R6

40

R7

39

C4

38

C5

37

C6

36

C7

35

NC

34

OSC1

33

VDD

32

RESET

31

CAPS

30

R8

29

R9

28

R10

27

R11

26

R12

25

R13

24

R14

23

R15

22

M a cro K ey select

21

H T 82K 628A

4 0 D IP

Pin Description

Pin No. Pin Name I/O Description

10~7, 2~1,
40~39, 29~22
14~11

6~3, 38~35 C0~C7 I Keyboard matrix scanning input pins

15 VSS

16 SCROLL O Scroll Lock indicator
17 NUM O Num Lock indicator
18 DATA I/O Bidirectional data transmission line

19 CLOCK I/O

20 Fn Select I

21 Macro Key Select I

30 CAPS O Caps Lock indicator

R0~R19 O

¾

Keyboard matrix scanning output pins

Negative power supply, ground

Synchronous clock signal. Used to clock the transmis
sion data.

Mini-keyboard select, enables the function if connected
to VSS.

Macro Key select, disables the function if connected to
VSS.

-

2 July 20, 2000

Preliminary

Pin No. Pin Name I/O Description

Chip reset input. Active low. Built-in power-on reset

31 RESET

32 VDD

33 OSC1 I

34 NC

Absolute Maximum Ratings

I

circuit to reset the entire chip. Chip can also be exter
nally reset via RESET

5.0V positive power supply

¾

pin.

System clock input; 110kW resistor connected for RC
OSC

No connection

¾

HT82K628A

-

Supply Voltage .............................-0.3V to 5.5V

Input Voltage ................V

3V to VDD+0.3V

SS-0.

Storage Temperature ................-50°Cto125°C

Operating Temperature .............-25°Cto70°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi

mum Ratings² may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged expo
sure to extreme conditions may affect device reliability.

Electrical Characteristics

Symbol Parameter

V

I

V

V

I

I

I

DD

DD

IL

IH

OL

OH

LED

Operating Voltage

Operating Current
(RC OSC)

Input Low Voltage 5V

Input High Voltage 5V

Sink Current 5V

Source Current 5V

LED Sink Current
(Scroll, Num, Caps)

Test Conditions

V

DD

Conditions

¾¾

5V

No load, f

SYS

= 2MHz

¾
¾

V

= 0.5V

OL

V

= 4.5V

OH

=3.2V

V

5V

OL

Min. Typ. Max. Unit

4 5 5.5 V

¾

3.5

25mA

0

¾
¾

712

-2.5 -4.5 ¾

10 14 18 mA

Ta=25°C

1.5 V

5V

mA

¾

mA

Internal Pull-high

R

ph

Resistance

5V

¾

51220

kW

(C0~C7, R0~R19)
Internal Pull-high

R

ph1

Resistance

5V

¾

2 4.7 8

kW

(DATA, CLOCK)

R

f

ph2

SYS

Internal Pull-high
Resistance (RESET

)

5V

System Clock (RC OSC) 5V

¾

25 50 75

¾¾2¾

kW

MHz

-

-

3 July 20, 2000

Preliminary

Functional Description

Command from the host

The following table shows the commands that
the host may send and their hexadecimal val
ues.

Command Hex Value

Set/Reset Status Indicators ED

Echo EE

Invalid Command EF

Select Alternate Scan Codes F0

Invalid Command F1

Read ID F2

Set Typematic Rate/Delay F3

Enable F4

Default Disable F5

Set Default F6

Set All Keys - Typematic F7

Set All Keys - Make/Break F8

Set All Keys - Make F9

Set All Keys - Typematic/
Make/Break

Set Key Type - Typematic FB

Set Key Type - Make/Break FC

Set Key Type - Make FD

Resend FE

Reset FF

The commands may be sent to the HT82K628A
at any time and the HT82K628A will respond
within 25ms except when performing the inter
nal diagnostics or executing a Reset command.

FA

HT82K628A

byte (hex ED). The HT82K628A responds to the
command byte with ACK, discontinues scan
ning, assignments for this option byte are as

­follow:

Bit Indicator

0 Scroll Lock Indicator

1 Num Lock Indicator

2 Caps Lock Indicator

3~7 Reserved (Must be 0)

If a bit for an indicator is set to 1, the indicator
is turned on. If a bit is set to 0, the indicator is
turned off.

The HT82K628A responds to the option byte
with ACK, sets the indicators and if the
HT82K628A was previously enabled, continues
scanning. The status of the indicators will re
flect the bits in the option byte and can be acti
vated or deactivated in any combination. If
another command is received in place of the op
tion byte, execution of the Set/Reset Mode Indi
cators command is stopped, with no change to
the indicator status, and the new command is
processed.

Immediately after power-on, the lights default
to the off state. If the Set Default and Default
Disable commands are received, the lamps re­main in the state they were in before the com­mand was received.

EEH - Echo

Echo is a diagnostic aid. When the HT82K628A
receives this command, it issues a hex EE re
sponse and if the HT82K628A was previously

­enabled, continues scanning.

-

-

-

-

-

-

EDH - Set/Reset status indicators

Three status indicators on the keyboard-Num
Lock, Caps Lock, and Scroll Lock-are accessible
by the host. The HT82K628A activates or deac
tivates these indicators when it receives a valid
command-code sequence from the system. The
command sequence begins with the command

EFH and F1H - Invalid command

EFh and F1h are invalid commands and are not
supported. If HT82K628A receives one of these
and sends it, the HT82K628Awill not acknowl

­edge the command, but returns a Resend com

mand and continues in its previous scanning
state.

4 July 20, 2000

-

-

Preliminary

HT82K628A

F0H - Select alternate scan codes

This command instructs the HT82K628A to se
lect one of the three sets of scan codes. The
HT82K628A acknowledges receipt of this com
mand with ACK, clears both the output buffer
and the typematic key. The host then sends the
option byte and the keyboard responds with an
other ACK. An option byte value of hex 01 se
lects scan code set 1, hex 02 selects set 2 and
hex 03 selects code set3.

An option byte value of hex 00 causes the
HT82K628A to acknowledge with ACK and
sends a byte telling the host which scan code set
is currently in use.

After establishing the new scan code set, the
HT82K628A returns to the scanning state it
was in before receiving the Select Alternate
Scan Codes command.

F2H - Read ID

This command requests identification informa
tion from the HT82K628A. The HT82K628A re

sponds with ACK, discontinues scanning and
sends the two keyboard ID bytes hex 83h and
Abh. After the output of the second ID byte, the
HT82K628A resumes scanning.

F3H - Set typematic Rate/Delay

The host issues the Set Typematic Rate/Delay
command to change the typematic rate and de­lay. The HT82K628A responds to the command
with ACK, stops scanning and waits for the sys­tem to issue the rate/delay value byte. The
HT82K628A responds to the value byte with
another ACK, sets the rate and delay to the
value indicated, and continues scanning (if it
was previously enabled). Bit6 and 5 indicate
the delay, and bits 4, 3, 2, 1 and 0 indicate the
rate. Bit7 is always 0. The delay is equal to 1
plus the binary value bit 6 and 5, multiplied by
250ms±20%.

The period (interval from one typematic output
to the next) is determined by the following
equation:

Period = (8+A)*(2^B)*0.00417 seconds.

Where:
A = binary value of bits 2, 1, and 0.

­B = binary value of bits 4, and 3.

­The typematic rate is 1 for each period and are

listed as follows:

-

-

-

-

Bit

00000 30.0 10000 7.5

00001 26.7 10001 6.7

00010 24.0 10010 6.0

00011 21.8 10011 5.5

00100 20.0 10100 5.0

00101 18.5 10101 4.6

00110 17.1 10110 4.3

00111 16.0 10111 4.0

01000 15.0 11000 3.7

01001 13.3 11001 3.3

01010 12.0 11010 3.0

01011 10.9 11011 2.7

01100 10.0 11100 2.5

01101 9.2 11101 2.3

01110 8.0 11110 2.1

01111 8.0 11111 2.0

The default values for the HT82K628A are as
follows:

Typematic rate= 10.9 characters per second ±
20%

Delay = 500ms±20%

The execution of this command stops without
change to the existing rate if another command
is received instead of the rate/delay value byte.

F4H - Enable

Upon receipt of this command, the HT82K628A
will respond with ACK, clears its output buffer,
clears the last typematic key, and starts scan
ning.

Typematic
Rate ± 20%

Bit

Typematic
Rate ± 20%

-

5 July 20, 2000

Preliminary

HT82K628A

F5H - Default disable

The Default Disable command resets all condi
tions to the power on default states. The
HT82K628A will respond with ACK, clears its
output buffer, sets the default key types (scan
code set 3 operation only) and typematic
rate/delay, and clears the last typematic key.
The HT82K628A then stops scanning and
awaits further command.

F6H - Set default

The Set Default command resets all conditions
to the power on default states. The HT82K628A
will respond with ACK, clears its output buffer,
sets the default key types (scan code set 3 oper
ation only) and typematic rate/delay, and clears
the last typematic key then continues scanning.

F7H, F8H, F9H, FAH - Set all keys

These commands instruct the HT82K628A to
set all keys to the type listed below:

Hex Value Command

F7 Set All Keys-Typematic

F8 Set All Keys-Make/Break

F9 Set All Keys-Make

FA

The HT82K628A will respond with ACK, clears
its output buffer, sets all keys to the type indi­cated by this command,and continues scanning
(if it was previously enabled). Although these
commands can be sent using any code set, they
affect only scan code set 3 operation.

Set All Keys-Typematic
/Make/Break

FBH, FCH, FDH - Set key type

These commands instruct the HT82K628A to

­set individual keys to the type listed below:

Hex Value Command

FB Set Key Type-Typematic

FC Set Key Type-Make/Break

FD Set Key Type-Make

The HT82K628A will respond with ACK, clears
its output buffer and prepares to receive key
identification. Key identification is accom
plished by the host identifying each key by its

-

scan code value as defined in scan code set 3.
Only scan code set 3 values are valid for key
identification. The type of each identified key is
set to the value indicated by the command.
Although these commands can be sent using
any code set, they affect only scan code set 3 op
eration.

FEH - Resend

The host sends this command when it detects
an error in any transmission from the
HT82K628A. It is sent only after a data trans­mission and before the host allows the next
data output. When a Resend is received, the
HT82K628A sends the previous output again
(unless the previous output was Resend, in
which case the HT82K628A sends the last byte
before the Resend command).

-

-

6 July 20, 2000

Preliminary

HT82K628A

Commands to the host

The following table shows the commands that
the HT82K628A may send to the host, and their
hexadecimal values.

Command Hex Value

Key Detection
Error/Overrun

00 (Code Set 2 and 3)

Keyboard ID 83AB

Bat Completion Code AA

Bat Failure Core FC

Echo EE

Acknowledge FA

Resend FE

Key Detection
Error/Overrun

FF (Code Set 1)

00H or FFH - Key detection error

The HT82K628A sends a key detection error
character if conditions in the keyboard make it
impossible to identify a switch closure. If the
HT82K628A is using scan code set 1, the code is
FFH. For sets 2 and 3, the code is 00H.

00H or FFH - Overrun

An overrun character is placed in the
HT82K628A buffer and replaces the last code
when the buffer capacity has been exceeded.
The code is sent to the host when it reaches the
top of the buffer queue. If the HT82K628A is us­ing scan code set 1, the code is FFH. For sets 2
and 3, the code is 00H.

83AbH - Keyboard ID

The keyboard ID consists of 2 bytes, Hex
83AbH. The HT82K628A responds to the Read
ID with ACK, discontinues scanning and sends
2 ID bytes. The low byte is sent first followed by
the high byte. Following the output ofKeyboard
ID, the HT82K628A begins scanning.

EEH - Echo

The HT82K628A sends this code in response to
an Echo command.

AAH - BAT completion code

Following satisfactory completion of the BAT,
the HT82K628A sends AAH. Any other code in
dicates keyboard failure.

FCH - BAT failure code

If a BAT failure occurs, the HT82K628A sends
this code, discontinues scanning and waits for a
host response or reset.

FEH - Resend

The HT82K628A issues a Resend command fol
lowing receipt of an invalid input or any input
with incorrect parity. If the host sends nothing
to the HT82K628A, no response is required.

Data communications

·

Data output

¨

If CLK=0, no transmission (keyboard is in
hibited).

¨

If CLK=1, DATA=0, no transmission (sys­tem request to send).

¨

If CLK=1, DATA=1, transmission permit­ted.

¨

Data will be valid before the trailing edge
and beyond the leading edge of the clock.

¨

The KB checks the clock line for an active
level of at least every 60ms.

¨

If line contention occurs (system brings the
clock low before the tenth clock), set
clock=data=high.

-

-

-

7 July 20, 2000

Preliminary

HT82K628A

·

Data input

¨

The system overrides the clock line for at
least 60ms.

¨

The keyboard checks the clock line state at
intervals of 10ms

¨

If a system request-to-send is detected, the
keyboard counts 11 data bits.

¨

Data will be valid before the rising edge and
beyond the falling edge

¨

After the 10th bit, the keyboard checks for
an active level on the "data" line. If the line
is active it is forced to be inactive, and
counts one more bit.

Note: This action signals the system that

the keyboard has received its data.
Upon reception of this signal, the
system returns to the ready state, in
which it can accept keyboard outputs
or goes to the inhibit state until it is
ready.

If the keyboard "data" line is found to be at an
inactive level following the 10th bit, a frame
error has occurred, and the keyboard contin
ues to count until the "data" line becomes ac
tive. The keyboard then makes the "data" line
inactive and sends a Resend.

Data stream

Mode 1,2,3

B1:

start bit

always 0

B2:

b3:
b4:
b5:
B6
b7:
b8:
b9:

b10:

data bit 0
data bit 1
data bit 2
data bit 3
data bit 4
data bit 5
data bit 6
data bit 7

parity bit

(odd par)

b11:

stop bit

always 1

Note: The parity bit is either 1 or 0, and the 8

data bits, plus the parity bit, always
have an odd number of 1ms.

-

-

8 July 20, 2000

Preliminary

Key code set 1

Key Number

and Symbol

1 ~ ` 29/A9 47 X 2D/AD

2 ! 1 02/82 48 C 2E/AE

3 @ 2 03/83 49 V 2F/AF

4 # 3 04/84 50 B 30/B0

5 $ 4 05/85 51 N 31/B1

6 % 5 06/86 52 M 32/B2

7 ^ 6 07/87 53 < , 33/B3

8 & 7 08/88 54 > . 34/B4

9 * 8 09/89 55 ? / 35/B5

10 ( 9 0A/8A 57 Shift (R) 36/B6

11 ) 0 0B/8B 58 Ctrl (L) 1D/9D

12 _ - 0C/8C 60 Alt (L) 38/B8

13 + = 0D/8D 61 Space 39/B9

14 56 7D/D6 FD 62 Alt (R) E0 38/E0 B8

15 Back Space 0E/8E 64 Ctrl (R) E0 1D/E0 9D

16 Tab 0F/8F 90 Num Lock 45/C5

17 Q 10/90 91 7 Home 47/C7

18 W 11/91 92 4

19 E 12/92 93 1 End 4F/CF

20 R 13/93 96 8

21 T 14/94 97 5 4C/CC

22 Y 15/95 98 2

23 U 16/96 99 0 Ins 52/D2

24 I 17/97 100 * 37/B7

25 O 18/98 101 9 PgUp 49/C9

26 P 19/99 102 6

27 { [ 1A/9A 103 3 PgDn 51/D1

28 } ] 1B/9B 104 . Del 53/D3

*29

½

Make/Break Code

\ 2B/AB 105 - 4A/CA

Key Number

and Symbol

¬



¯

®

HT82K628A

Make/Break Code

4B/CB

48/C8

50/D0

4D/CD

9 July 20, 2000

Preliminary

HT82K628A

Key Number

and Symbol

30 Caps Lock 3A/BA 106 + 4E/CE

31 A 1E/9E 107 7E/FE

32 S 1F/9F 108 Enter E0 1C/E0 9C

33 D 20/A0 110 ESC 01/81

34 F 21/A1 112 F1 3B/BB

35 G 22/A2 113 F2 3C/BC

36 H 23/A3 114 F3 3D/BD

37 J 24/A4 115 F4 3E/BE

38 K 25/A5 116 F5 3F/BF

39 L 26/A6 117 F6 40/C0

40 : ; 27/A7 118 F7 41/C1

41 28/A8 119 F8 42/C2

**42

43 Enter 1C/9C 121 F10 44/C4

44 Shift (L) 2A/AA 122 F11 57/D7

**45 Macro 56/D6 123 F12 58/D8

46 Z 2C/AC 125 Scroll Lock 46/C6

*101-Key Keyboard Only
**102-Key Keyboard Only

½

Make/Break Code

\ 2B/AB 120 F9 43/C3

Key Number

and Symbol

Make/Break Code

10 July 20, 2000

Preliminary

HT82K628A

Key Number

and Symbol

75

76

79

80

81

83

84

85

86

89

When both shift keys are held down:
key number 75

When both shift keys are held down:
key number 95

Insert

Delete

¬

Home

End


¯

PgUp

PgDn

®

LWin

RWin

APP

Key Number

and Symbol

95 /

Base Case

Shift+Num

E0 52

/E0 D2

E0 53

/E0 D3

E0 4B

/E0 CB

E0 47

/E0 C7

E0 4F

/E0 CF

E0 48

/E0 C8

E0 50

/E0 D0

E0 49

/E0 C9

E0 51

/E0 D1

E0 4D

/E0 CD

E0 5B E0 AA E0 5B E0 B6 E0 5B E0 2A E0 5B

/E0 DB /E0 DB E0 2A /E0 DB E0 36 /E0 DB E0 AA

E0 5C E0 AA E0 5C E0 B6 E0 5C E0 2A E0 5C

/E0 DC /E0 DC E0 2A /E0 DC E0 36 /E0 DC E0 AA

E0 5D E0 AA E0 5D E0 B6 E0 5D E0 2A E0 5D

/E0 DD /E0 DD E0 2A /E0 DD E0 36 /E0 DD E0 AA

Base Left-Shift Right-Shift

E0 35

/E0 B5

Left-Shift Right-Shift Num Lock

E0 AA E0 52

/E0 D2 E0 2A

E0 AA E0 53

/E0 D3 E0 2A

E0 AA E0 4B

/E0 CB E0 2A

E0 AA E0 47

/E0 C7 E0 2A

E0 AA E0 4F

/E0 CF E0 2A

E0 AA E0 48

/E0 C8 E0 2A

E0 AA E0 50

/E0 D0 E0 2A

E0 AA E0 49

/E0 C9 E0 2A

E0 AA E0 51

/E0 D1 E0 2A

E0 AA E0 4D

/E0 CD E0 2A

Both Shift
E0 AA E0 B6 E0 52/E0 D2 E0 2A E0 36

E0 AA E0 35

/E0 B5 E0 2A

E0 B6 E0 52

/E0 D2 E0 36

E0 B6 E0 53

/E0 D3 E0 36

E0 B6 E0 4B

/E0 CB E0 36

E0 B6 E0 47

/E0 C7 E0 36

E0 B6 E0 4F

/E0 CF E0 36

E0 B6 E0 48

/E0 C8 E0 36

E0 B6 E0 50

/E0 D0 E0 36

E0 B6 E0 49

/E0 C9 E0 36

E0 B6 E0 51
/E0 D1 E0 36
E0 B6 E0 4D

/E0 CD E0 36

Both Shift

E0 AA E0 B6 E0 35

/E0 B5 E0 2A E0 36

E0 2A E0 52

/E0 D2 E0 AA

E0 2A E0 53

/E0 D3 E0 AA

E0 2A E0 4B

/E0 CB E0 AA

E0 2A E0 47

/E0 C7 E0 AA

E0 2A E0 4F

E0 CF E0 AA

E0 2A E0 48

E0 C8 E0 AA

E0 2A E0 50

/E0 D0 E0 AA

E0 2A E0 49

/E0 C9 E0 AA

E0 2A E0 51

E0 D1 E0 AA

E0 2A E0 4D

E0 CD E0 AA

E0 B6 E0 35

/E0 B5 E0 36

Key Number

and Symbol

124 Print Screen

Key Number

and Symbol

126 Pause E1 1D 45 E1 9D C5 E0 46 E0 C6

This key is not typematic, all associated scan codes occur on the make code.

Base Shift/Ctrl Alt

E0 2A E0 37

/E0 B7 E0 AA

Base Ctrl

11 July 20, 2000

E0 37

/E0 B7

54

/D4

Preliminary

HT82K628A

Key Number

and Function

ACPI Power E0 5E/E0 DE Make/Break
ACPI Sleep E0 5F/E0 DF Make/Break
ACPI Wake-up E0 63/E0 E3 Make/Break

Key Number

and Function

56 Brazil BA0 73/F3 Typematic
131 Japanese J131 7B/FB Make
132 Japanese J132 79/F9 Make
133 Japanese J133 70/F0 Make

150 Korea KC-L

151 Korea KC-R

Multimedia Key Function Make/Break code

E-Mail E0 6C/E0 EC

WWW Home E0 32/E0 B2

WWW Favorites E0 66/E0 E6

WWW Search E065/E0 E5

WWW Refresh E0 67/E0 E7

WWW Stop E0 68/E0 E8

WWW Forward E0 69/E0 E9

WWW Back E0 6A/E0 EA

Media E0 6D/E0 ED

Play/Pause E0 22/E0 A2

Stop E0 24/E0 A4

Prev Track E0 10/E0 90

Next Track E0 19/E0 99

Volume+ E0 30/E0 B0
Volume-

Mute E0 20/E0 A0

My Computer E0 6B/E0 EB

Make/Break code Default

Make/Break code Default

F1/­F0/-

E0 2E/E0 AE

Make

Make

12 July 18, 2000

Preliminary

Multimedia Key Function Make/Break code

Calculator E0 21/E0 A1

Screen save E0 26/E0 A6

Rec E0 1E/E0 9E

Rew E0 17/E0 97

Minimize E0 2D/E0 AD

Eject E0 11/E0 91

Explorer E0 14/E0 94

Key code set 2

Key Number

and Symbol

1 ~ ` 0E/F0 0E 47 X 22/F0 22

2 ! 1 16/F0 16 48 C 21/F0 21

3 @ 2 1E/F0 1E 49 V 2A/F0 2A

4 # 3 26/F0 26 50 B 32/F0 32

5 $ 4 25/F0 25 51 N 31/F0 31

6 % 5 2E/F0 2E 52 M 3A/F0 3A

7 ^ 6 36/F0 36 53 < , 41/F0 41

8 & 7 3D/F0 3D 54 > . 49/F0 49

9 * 8 3E/F0 3E 55 ? / 4A/F0 4A

10 ( 9 46/F0 46 57 Shift (R) 59/F0 59

11 ) 0 45/F0 45 58 Ctrl (L) 14/F0 14

12 _ - 4E/F0 4E 60 Alt (L) 11/F0 11

13 + = 55/F0 55 61 Space 29/F0 29

14 6A/F0 6A 62 Alt (R) E0 11/E0 F0 11

15 Back Space 66/F0 66 64 Ctrl (R) E0 14/E0 E0 F0 14

16 Tab 0D/F0 0D 90 Num Lock 77/F0 77

17 Q 15/F0 15 91 7 Home 6C/F0 6C

18 W 1D/F0 1D 92 4

19 E 24/F0 24 93 1 End 69/F0 69

20 R 2D/F0 2D 96 8

Make/Break Code

Key Number

and Symbol

¬



HT82K628A

Make/Break Code

6B/F0 6B

75/F0 75

13 July 20, 2000

Preliminary

HT82K628A

Key Number

and Symbol

21 T 2C/F0 2C 97 5 73/F0 73

22 Y 35/F0 35 98 2

23 U 3C/F0 3C 99 0 Ins 70/F0 70

24 I 43/F0 43 100 * 7C/F0 7C

25 O 44/F0 44 101 9 PgUp 7D/F0 7D

26 P 4D/F0 4D 102 6

27 { [ 54/F0 54 103 3 PgDn 7A/ F0 7A

28 } ] 5B/F0 5B 104 . Del 71/F0 71

*29

30 Caps Lock 58/F0 58 106 + 79/F0 79

31 A 1C/F0 1C 107 6D/F0 6D

32 S 1B/F0 1B 108 Enter E0 5A/E0 F0 5A

33 D 23/F0 23 110 ESC 76/F0 76

34 F 2B/F0 2B 112 F1 05/F0 05

35 G 34/F0 34 113 F2 06/F0 06

36 H 33/F0 33 114 F3 04/F0 04

37 J 3B/F0 3B 115 F4 0C/F0 0C

38 K 42/F0 42 116 F5 03/F0 03

39 L 4B/F0 4B 117 F6 0B F0 0B

40 : ; 4C/F0 4C 118 F7 83/F0 83

41 52/F0 52 119 F8 0A/F0 0A

**42

43 Enter 5A/F0 5A 121 F10 09/F0 09

44 Shift (L) 12/F0 12 122 F11 78/F0 78

**45 Macro 61/F0 61 123 F12 07/F0 07

46 Z 1A/F0 1A 125 Scroll Lock 7E/F0 7E

*101-Key Keyboard Only
**102-Key Keyboard Only

½

½

Make/Break Code

\ 5D/F0 5D 105 - 7B/F0 7B

\ 5D/F0 5D 120 F9 01/F0 01

Key Number

and Symbol

Make/Break Code

¯

®

72/F0 72

74/ F0 74

14 July 20, 2000

Preliminary

HT82K628A

Key Number

and Symbol

75

76

79

80

81

83

84

85

86

89

When both shift keys are held
down: key number 75

Insert

Delete

¬

Home

End


¯

PgUp

PgDn

®

LWin

RWin

APP

Base Case

Shift+Num

E0 70

/E0 F0 70

E0 71

/E0 F0 71

E0 6B

/E0 F0 6B

E0 6C

/E0 F0 6C

E0 69

/E0 F0 69

E0 75

/E0 F0 75

E0 72

/E0 F0 72

E0 7D

/E0 F0 7D

E0 7A

/E0 F0 7A

E0 74

/E0 F0 74

E0 1F E0 F0 12 E0 1F E0 F0 59 E0 1F E0 12 E0 1F

/E0 F0 1F /E0 F0 1F E0 12 /E0 F0 1F E0 59 /E0 F0 1F E0 F0 12

E0 27 E0 F0 12 E0 27 E0 F0 59 E0 27 E0 12 E0 27

/E0 F0 27 /E0 F0 27 E0 12 /E0 F0 27 E0 59 /E0 F0 27 E0 F0 12

E0 2F E0 F0 12 E0 2F E0 F0 59 E0 2F E0 12 E0 2F

/E0 F0 2F /E0 F0 2F E0 12 /E0 F0 2F E059 /E0 F0 2F E0 F0 12

Left-Shift Right-Shift Num Lock

E0 F0 12 E0 70

/E0 F0 70 E0 12

E0 F0 12 E0 71

/E0 F0 71 E0 12

E0 F0 12 E0 6B

/E0 F0 6B E0 12

E0 F0 12 E0 6C

/E0 F0 6C E0 12

E0 F0 12 E0 69

/E0 F0 69 E0 12

E0 F0 12 E0 75

/E0 F0 75 E0 12

E0 F0 12 E0 72
/E0 F0 72 E0 12
E0 F0 12 E0 7D

/E0 F0 7D E0 12

E0 F0 12 E0 7A

/E0 F0 7A E0 12

E0 F0 12 E0 74
/E0 F0 74 E0 12

Both Shift
E0 AA E0 B6 E0 52/E0 D2 E0 2A E0 36

E0 F0 59 E0 70

/E0 F0 70 E0 59

E0 F0 59 E0 71
/E0 F0 71 E0 59
E0 F0 59 E0 6B

/E0 F0 6B E0 59

E0 F0 59 E0 6C

/E0 F0 6C E0 59

E0 F0 59 E0 69
/E0 F0 69 E0 59

E0 F0 59 E0 75
/E0 F0 75 E0 59

E0 F0 59 E0 72
/E0 F0 72 E0 59
E0 F0 59 E0 7D

/E0 F0 7D E0 59

E0 F0 59 E0 7A

/E0 F0 7A E0 59

E0 F0 59 E0 74
/E0 F0 74 E0 59

E0 12 E0 70

/E0 F0 70 E0 F0 12

E0 12 E0 71

/E0 F0 71 E0 F0 12

E0 12 E0 6B

/E0 F0 6B E0 F0 12

E0 12 E0 6C

/E0 F0 6C E0 F0 12

E0 12 E0 69

/E0 F0 69 E0 F0 12

E0 12 E0 75

/E0 F0 75 E0 F0 12

E0 12 E0 72

/E0 F0 72 E0 F0 12

E0 12 E0 7D

/E0 F0 7D E0 F0 12

E0 12 E0 7A

/E0 F0 7A E0 F0 12

E0 12 E0 74

/E0 F0 74 E0 F0 12

Key Number

and Symbol

95 /

When both shift keys are held down:
key number 95

Key Number

and Symbol

124 Print Screen

Key Number

and Symbol

126 Pause E1 14 77 E1 F0 14 F0 77 E0 7E E0 F0 7E

This key is not typematic, all associated scan codes occur on the make code.

Base Left-Shift Right-Shift

E0 4A

/E0 F0 4A

Base Shift/Ctrl Alt

E0 12 E0 7C

/E0 F0 7C E0 F0 12

E0 F0 12 E0 4A
/E0 F0 4A E0 12

Both Shift

E0 F0 12 E0 F0 59 E0 4A

/E0 F0 4A E0 12 E0 59

E0 7C

/E0 F0 7C

Base Ctrl

15 July 20, 2000

E0 F0 59 E0 4A
/E0 F0 4A E0 59

84

/F0 84

Preliminary

HT82K628A

Key Number

and Function

ACPI Power E0 37/E0 F0 37 Make/Break

ACPI Sleep E0 3F/E0 F0 3F Make/Break

ACPI Wake-up E0 5E/E0 F0 5E Make/Break

Key Number

and Function

56 Brazil BA0 51/F0 51 Typematic
131 Japanese J131 67/F0 67 Make
132 Japanese J132 64/F0 64 Make
133 Japanese J133 13/F0 13 Make

150 Korea KC-L

151 Korea KC-R

Multimedia Key Function Make/Break code

E-Mail E0 48/E0 F0 48

WWW Home E0 3A/E0 F0 3A

WWW Favorites E0 18/E0 F0 18

WWW Search E0 10/E0 F0 10

WWW Refresh E0 20/E0 F0 20

WWW Stop E0 28/E0 F0 28

WWW Forward E0 30/E0 F0 30

WWW Back E0 38/E0 F0 38

Media E0 50/E0 F0 50

Play/Pause E0 34/E0 F0 34

Stop E0 3B/E0 F0 3B

Prev Track E0 15/E0 F0 15

Next Track E0 4D/E0 F0 4D

Volume+ E0 32/E0 F0 32
Volume-

Mute E0 23/E0 F0 23

My Computer E0 40/E0 F0 40

Calculator E0 2B/E0 F0 2B

Make/Break code Default

Make/Break code Default

F1/­F2/-

E0 21/E0 F0 21

Make

Make

16 July 20, 2000

Multimedia Key Function Make/Break code

Key code set 3

Key

Number

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

*29

30
31
32

Preliminary

Screen save E0 4B/E0 F0 4B

Rec E0 1C/E0 F0 1C

Rew E0 43/E0 F0 43

Minimize E0 22/E0 F0 22

Eject E0 1D/E0 F0 1D

Explorer E0 2C/E0 F0 2C

Make

/Break Code

0E/F0 0E

16/F0 16

1E/F0 1E

26/F0 26
25/F0 25

2E/F0 2E

36/F0 36

3D/F0 3D

3E/F0 3E

46/F0 46
45/F0 45

4E/F0 4E

55/F0 55

5D/F0 5D

66/F0 66

0D /F0 0D

15/F0 15

1D/F0 1D

24/F0 24

2D/F0 2D

2C/F0 2C

35/F0 35

3C/F0 3C

43/F0 43
44/F0 44

4D/F0 4D

54/F0 54
5B/F0 5B
5C/F0 5C

14/F0 14
1C/F0 1C
1B/F0 1B

Default

Key State

Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic

Make/Break

Typematic
Typematic

Key

Number

55
57
58
59
60
61
62
63
64
75
76
79
80
81
83
84
85
86
89
90
91
92
93
95
96
97
98

99
100
101
102
103

Make

/Break Code

4A/F0 4A

59/F0 59
11/F0 11

8B/F0 8B

19/F0 19
29/F0 29
39/F0 39

8C/F0 8C

58/F0 58
67/F0 67
64/F0 64
61/F0 61

6E/F0 6E

65/F0 65
63/F0 63

60/F0 60
6F/F0 6F
6D/F0 6D
6A/F0 6A

76/F0 76
6C/F0 6C
6B/F0 6B

69/F0 69

77/F0 77

75/F0 75

73/F0 73

72/F0 72

70/F0 70
7E/F0 7E
7D/F0 7D

74/F0 74
7A/F0 7A

HT82K628A

Default

Key State

Typematic
Make/Break
Make/Break
Make/Break
Make/Break

Typematic

Make Only
Make/Break

Make Only

Make Only

Typematic

Typematic

Make Only

Make Only

Typematic

Typematic

Make Only

Make Only

Typematic

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

Make Only

17 July 20, 2000

Preliminary

HT82K628A

Key

Number

33
34
35
36
37
38
39
40
41

**42

43
44

**45

46
47
48
49
50
51
52
53
54

*101-Key Keyboard Only
**102-Key Keyboard Only

Make

/Break Code

23/F0 23

2B/F0 2B

34/F0 34
33/F0 33

3B/F0 3B

42/F0 42
4B/F0 4B
4C/F0 4C

52/F0 52

53/F0 53
5A/F0 5A

12/F0 12

13/F0 13
1A/F0 1A

22/F0 22

21/F0 21
2A/F0 2A

32/F0 32

31/F0 31
3A/F0 3A

41/F0 41

49/F0 49

Default

Key State

Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic

Make/Break

Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic
Typematic

Key

Number

104
105
106
107
108
110
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127

Make

/Break Code

71/F0 71

84/F0 84
7C/F0 7C
7B/F0 7B

79/F0 79

08/F0 08

07/F0 07

0F/F0 0F

17/F0 17

1F/F0 1F

27/F0 27

2F/F0 2F

37/F0 37

3F/F0 3F

47/F0 47

4F/F0 4F

56/F0 56
5E/F0 5E

57/F0 57

5F/F0 5F

62/F0 62
8D/F0 8D

Default

Key State

Make Only
Make Only
Typematic
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Make Only
Typematic

Key Number

and Function

56 Brazil BA0 51/F0 51 Typematic
131 Japanese J131 67/F0 67 Make
132 Japanese J132 64/F0 64 Make
133 Japanese J133 13/F0 13 Make

150 Korea KC-L

151 Korea KC-R

Make/Break code Default

F1/­F2/-

18 July 20, 2000

Make

Make

Timing Diagrams

Data output

Preliminary

HT82K628A

(1 ) (3 ) (3 )

CLK

(2 )

DATA Start Bit Bit 0 Parity Bit Stop Bit

T1

T2

T3

T4

T5

Keyboard data input

(1 )

CLK

DATA Start Bit Bit 0 Parity Bit Stop Bit

1st

CLK

T3 T4

T1 T2

Tim ing P aram eter

D A TA transition to the falling edge of C LK

R ising edge of C LK to D A TA transition

D u r a tio n o f C L K in a c tiv e

D u r a tio n o f C L K a c tiv e

T im e to a u x ilia ry d e v ic e in h ib it a fte r c lo c k 1 1 to e n s u re
the auxiliary device does not start another transm ission

(4 )

(2 )

I/O

In h ib it

(3 )

1st
CLK

T7 T8

T9

(5 ) (7 )

2nd
CLK

2nd
CLK

(3 )

CLK

(3 ) (4 )

10th
CLK

9th

(5 )

10th
CLK

(6 )

11th
CLK

(5 ) (7 )

T5

Min/Max

5/25 msec

5/T 4-5 msec
30/50 msec

30/50 msec

>0/50 msec

11th
CLK

(6 )

(8 )

Tim ing P aram eter

D u r a tio n o f C L K in a c tiv e

T7

T8

D u r a tio n o f C L K a c tiv e

T 9 T im e fro m in a c tiv e to a c tiv e C L K tr a n s itio n , u s e d to tim e

w hen the auxiliary device sam ples D ATA

19 July 20, 2000

Min/Max

30/50 msec

30/50 msec

5/25

sec

m

Preliminary

HT82K628A

Mini keyboard operation manual

·

Macro key

¨

Open Old File

Should send <Ctrl>+<O> to system when pressed.

¨

SAVE

Should send <Ctrl>+<S> to system when pressed.

¨

PRINT

Should send <Ctrl>+<P> to system when pressed.

¨

CUT

Should send <Ctrl>+<X> to system when pressed.

¨

COPY

Should send <Ctrl>+<C> to system when pressed.

¨

PASTE

Should send <Ctrl>+<V> to system when pressed.

¨

Rotate Window

Press this key to switch the activated task window. Should send <Alt>+<Tab> to system when
pressed.

¨

Close Window

Press this key to close the window. Should send <Alt>+<F4> to system when pressed.

20 July 20, 2000

·

Fn key usage

Preliminary

Status

HT82K628A

Key

Location

7 &7 Home 7 7

8*8

9 (9 PgUp 9 9

0)0 * * 0

UU

II 5 I

OO

PP - - P

J J End 1 J

KK

L L PgDn 3 L

:; :; + + :;

M M Ins 0 M

>. >. Del . >.

Fn

OFF OFF ON OFF OFF ON ON ON

Num
Lock

Fn

¬

®



¯

Num
Lock

Fn

Num
Lock

88

4U

6O

2K

Fn

Num
Lock

?/ ?/ / / ?/

Enter Enter (L) Enter(R) Enter(R) Enter(L)

F1/F11 F1 F11 F1 F11

F2/F12 F2 F12 F2 F12

F10/

ScrLock

/PgUp 

¯/PgDn ¯

¬/Home ¬

®/End ®

F10 ScrLock F10 ScrLock

Page Up

Page Down

Home

End

21 July 20, 2000



¯

¬

®

Page Up

Page Down

Home

End

Key matrix

R0

126

R1

17

R2

18

R3

19

R4

20

R5

23

R6

24

R7

25

R8

26

SCROLL

R9

125

R10

14

R11

91

R12

96

R13

101

R14

106

Preliminary

C0 C1 C2 C3 C4 C5 C6 C7

PAUSE

Q

W

E

R

U

I

O

P

LOCK

|(\)

7(Home)

8()

9(PgUp)

+

Pre Track Stop Play/Pause

TAB

16

CAPS

LOCK

30

F3

114

T

21

Y

22

](})

28

F7

118

[({)

27

Alt(R)+F4 Vol-

BACK

15

4(¬)

92

5

97

6(®)

102

.

107

A

31

S

32

D

33

F

34

J

37

K

38

L

39

;(:)

40

\(|)

29

1(End)93SPACE

2(¯)

98

3(PgDn)

103

ENTER-R

108

110

45

115

35

36

117

Ctrl(R)+O

41

ALT-L

60

122

61

0(Ins)

99

.(Del)

104

83

ESC

|(\)

F4

G

H

F6

'(²)

F11



CTRL-R

64

Z

46

X

47

C

48

V

49

M

52

,(<)

53

.(>)

54

|(\)

42

Vol+

ENTER-L43F12

NUM

LOCK

90

/

95

*

100

Ctrl(R)+X

Next

Track

N-CHG

131

CHG

132

ROMA

133

B

50

N

51

\(-)

56

APP

/(?)

55

ALT-R

62

123

¯

84

®

89

-

105

¬

79

HT82K628A

CTRL-L58F5

¢(~)

1

F1

112

F2

113

5(%)

6

6(^)

7

=(+)

13

F8

119

_(-)

12

Mute

F9

120

DEL

76

INS

75

PgUp85PgDn

HOME80END

116

1(!)

2

2(@)

3

3(#)

4

4($)

5

7(&)

8

8(*)

9

9(¢(¢)

10

0(¢)¢)

11

PRINT

SCREEN

F10

121

POWER

SLEEP

86

81

22 July 20, 2000

C0 C1 C2 C3 C4 C5 C6 C7

R15 Wake-up

R16

R17

R18 Media E-mail

R19

Screen

Save

KC-L

150

My

Computer

SHIFT-L44SHIFT-R

WIN-L Ctrl(R)+C Rec Rew Min Eject

Ctrl(R)+V WIN-R 00 000 Ctrl(R)+S F2/F12

Calculator

Preliminary

WWW

57

WWW
Home

/

Page Up¯/Page Down¬/Home

Search

WWW

Back

Alt(R)+Tab Ctrl(R)+P F1/F11 FN

WWW

Forward

WWW

Stop

®/

END

HT82K628A

151

WWW

Refresh

Explorer

F10/

Scroll

KC-R

WWW
Bkmk

23 July 20, 2000

Application Circuits

VDD

GND

option

F.B.

10mF

47k

0.1mF

Preliminary

32

VDD

15

0.1mF

V

DD

L E D 2

CLOCK

DATA

L E D 1

L E D 0

110k

V

DD

W

V

DD

1N 4148

W

VSS

30

CAP

17

NUM

16

SCR

31

RESET

19

CLK

18

DATA

33

OSC1

20

Fn Select

21

M a cro K ey select

HT82K628A

6

C0

5

C1

4

C2

3

C3

38

C4

37

C5

36

C6

35

C7

10

R0

9

R1

8

R2

7

R3

2

R4

1

R5

40

R6

39

R7

29

R8

28

R9

27

R10

26

R11

25

R12

24

R13

23

R14

22

R15

14

R16

13

R17

12

R18

11

R19

Note:

Fn Select ® GND: Enable
Macro Key Select ® GND: Disable

H T 82K 628A

the Mini Keyboard

the Macro Key

24 July 20, 2000

Preliminary

HT82K628A

Holtek Semiconductor Inc. (Headquarters)

No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]

Holtek Semiconductor Inc. (Taipei Office)

5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Fax: [phone] (International sales hotline)

Holtek Semiconductor (Hong Kong) Ltd.

RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: [phone]
Fax: [phone]

Copyright Ó 2000 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek
assumes noresponsibility arising from the use of the specifications described. The applications mentioned herein are
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications
will be suitable without further modification, nor recommends the use of its products for application that may pres
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

25 July 20, 2000

-