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HT82K28A

Win98 Keyboard Encoder

Pin Assignment

February 16, 2000

General Description

The HT82K28A is a keyboard encoder espe-

cially designed for IBM PC/AT, IBM PS/2 and

all compatible machines.
The HT82K28A accepts keyboard inputs and

contains a 16-character first-in-first-out buffer

in which data is stored. An inexpensive RC os-

cillator can be used for the system clock. The

device offers the advantage of simple imple-

mentation in high performance and low cost

keyboard applications.

Features

Designed for Windows 95/98/NT

Supports 3 Windows 95 Keys

Supports Power, Sleep and Wake-up Win-

dows 98 ACPI functions

Supports Japanese, Korean and Portuguese

Supports Japanese DOS/V 106-key

keyboard

Supports code set 1, for PS/2 model

30 keyboard

Supports code set 2, for PC/AT, PS/2 model

50,60 keyboards

Supports code set 3, for PS/2 model

80 keyboard

RC oscillator

Phantom key detection

Minimal external components

Pin-compatible with Holtek HT6547E-2

40-pin DIP/DICE form

H T 8 2 K 2 8 A

4 0 D I P

4 0
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1

C 1
C 0
D A T A
C L O C K
R 1 8
R 1 7
N C
R 1 6
C A P
N U M
S C R L
R 9
R 8
R 1 5
R 1 4
N C
R 1 3
R 7
R 6
R 5

O S C 1

V S S

V D D

V S S

I O 0
I O 1

C 2
C 3
C 4
C 5
C 6
C 7

R 1 0
R 1 1
R 1 2

R 0
R 1
R 2
R 3
R 4

1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0

Pin Description

Pin No.

Pin Name I/O

Description

OSC1

System clock input

2, 4

VSS

¾ Negative power supply, ground

VDD

¾ Positive power supply

5, 6

IO0~IO1

Customer defined optional output lines

39, 40,

7~12

C0~C7

Keyboard matrix scanning input pins

16~23, 28,

29, 13~15

24, 26, 27

33, 35

R0~R18

Keyboard matrix scanning output pins

25, 34

¾ No connection

SCRL

LED pin

NUM

LED pin

CAP

LED pin

CLOCK

I/O Synchronous clock signal. Used to clock the transmission data

DATA

I/O Bidirectional data transmission line

Absolute Maximum Ratings

Supply Voltage............................4.75V to 5.25V

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

-0.3V to V

+0.3V

Storage Temperature.................-55°C to 125°C

Operating Temperature ..................0°C to 70°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.

HT82K28A

February 16, 2000

Electrical Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions Min. Typ. Max. Unit

Operating Voltage

4.75

5.25

Operating Current

Input Low Voltage (C0~C7)

0.6

Input Low Voltage (DATA, CLOCK)

0.6

Input High Voltage

3.5

Output Low Voltage (R0~R18)

=10mA

0.5

Output Low Voltage (DATA, CLOCK)

=15mA

0.5

Internal Pull-high Resistance (C0~C7)

Internal Pull-high Resistance

(CLOCK, DATA)

SYS

System Clock

MHz

HT82K28A

February 16, 2000

HT82K28A

February 16, 2000

Functional Description

The HT82K28A basic function is to detect key

press and release activity and to transmit the

corresponding scan code, as well as make and

break codes to the system.
The device also accepts commands from the sys-

tem and responds to the system if necessary. All

communication between the keyboard and the

system is managed through the CLOCK and

DATA pins.
The keyboard begins to scan for pressed or re-

leased keys and commands from the system after

the BAT (Basic Assurance Test) has been run.

Working modes
Three working modes are supported by the

HT82K28A. These are setup by the alternate

scan code command F0. The various modes are

described as follows.

Mode 1

Supports code set 1 for PS/2 model 30 key-

boards.

Enters mode1 after an F0 Command is issued

followed by a 1".

Contains an 11 bit data stream, including one

start bit (always zero) eight data bits, one par-

ity bit (odd parity) and one stop bit (always

one).

All keys are typematic/make/break as default.

The working mode can be changed again in

this mode, by issuing an F0 command fol-

lowed by an option. See the F0 command for

more detail.

Mode 2

Supports code set 2 for PC/AT, PS/2 model 50,

60 keyboards.

Enters mode 2 after power on.

The working mode can be changed by an F0

command followed by an option byte 1, 2 or 3.

See the F0 command for more details.

Contains an 11 bit data stream, including one

start bit (always zero) eight data bits, one par-

ity bit (odd parity) and one stop bit (always

one)

All keys are typematic/make/break as default.

Mode 3

Supports code set 3, for PS/2 model 80 key-

boards.

Enters mode 3 when an F0 command is issued

followed by a 3".

Contains an 11 bit data stream, including one

start bit (always zero) eight data bits, one par-

ity bit (odd parity) and one stop bit (always

one).

Buffers
The buffers support the following functions:

16-byte FIFO buffer: stores 16 keystrokes

scan codes.

Additional keystrokes will be ignored.

Response codes, i.e FA/FE... do not occupy

buffer positions.

Basic assurance test - BAT
The following functions are offered by the Basic

Assurance Test:

Turns on LED status indicators.

Keyboard processor test.

RAM test.

Turns off LED status indicators, i.e. the

LEDs.

Reports the BAT result to the system.

Note: During the BAT, activity on the "clock"

and "data" line are ignored. The LED¢s

are turned on at the beginning and

turned off at the end of the BAT. The

BAT takes a minimum of 450ms after

POR and a maximum of 2.5s. The re-

sponse to a satisfactory BAT completion

is ²AA² and response to BAT failure is

an ²FC² error. The reset keyboard com-

mand ²FF² will also cause the keyboard

to execute the BAT. Completion codes

are sent between 300 and 500ms after a

reset command is acknowledged. After

the BAT, the keyboard sets the keys to

typematic and make/break, and sets the

default typematic rate and delay.

HT82K28A

February 16, 2000

Power-on
Two important activities take place when power

is first applied to the keyboard. The first is the

presence of an H/W signal POR (Power-On-Re-

set) that resets the keyboard processor. The sec-

ond activity is the running of the self test BAT

(Basic Assurance Test) routine.

PC-type/mode/code set
The following table describes the relationship

between different computer types, the working

mode and the code sets.

PS/2 30

mode 1

code set 1

PC-AT

mode 2

code set 2

PS/2 50

mode 2

code set 2

PS/2 60

mode 2

code set 2

PS/2 80

mode 3

code set 3

The mode can be changed between mode 2 & 3.

Keys

For code set 1, 2
All keys except the PAUSE key have a make

and break code. The PAUSE key has a make

code only.
The defaults except for PAUSE are make/

break/typematic. In mode 1, 2 and 3 the key

type may be changed to be one of the follow-

ing:

Typematic

Make/break

Make

Typematic/make/break

All keys except PAUSE are typematic.

Typematic means that the KB keeps send-

ing make codes if the key is held down.
The data report is according to the

typematic rate/delay:

Default values are: delay 500ms ± 20%

10.9 char/sec ± 20%

The typematic rate and delay can be modi-

fied with the F3 command.

If two or more keys are held down, only the

last key pressed repeats at the typematic

rate.
Typematic operation stops when the last

key pressed is released even if other keys

are still held down.
If a key is pressed and held down while key-

board transmission is inhibited, only the

first make code is stored in the buffer over-

flow as a result of typematic action.
Four key types are supported as shown:

Key type

press

hold

release

Typematic

Make/break

Make

Typematic/

make/break

make1

make2

break

Note: "make1" send out only one make

code.

"Make2" continue sending out make

codes until key is released.

"X" nothing sent out.

For code set 3

Typematic

Make/break

Make

Typematic/make/break
Can be configured by command

Time interval between phantoms
The time interval between two continuous error

codes 00/FF sent while phantom detected=

1000ms ± 20%

P O R

R e s e t

1 5 0 m s ~ 2 s

3 0 0 m s ~ 5 0 0 m s

4 5 0 m s ~ 2 . 5 s e c

P o w e r o n s t a r t

B A T s t a r t e d

B A T c o m p l e t e

m o d e 1

m o d e 2

m o d e 3

HT82K28A

February 16, 2000

The keyboard should respond within 20ms, ex-

cept when performing the BAT or executing a

reset command.

Command description

Default disable - F5

Send an acknowledge FA to the system

Clear its output buffer, FIFO

Set the default key types

Set typematic rate/delay as default value

Clear the last typematic key

Stop scanning and wait for further instruc-

tion

Echo - EE

Send an EE to the system

Continue scanning if the keyboard is en-

abled
Note: This command does not need to feed

back the ACK

Enable - F4

Send an ACK to the system

Clear output buffer

Clear the last typematic key

Start scanning

Invalid command

Send an FE to the system

No further activities
Note: No ACK

Read ID - F2

Send an ACK to the system

Discontinue scanning

2 byte ID-AB, 83

The 2nd byte must follow the completion of

the first byte within 500ms

Resume scanning

System command table

Command

mode 1

mode 2

mode 3

FF - reset

FE - resend

FD - set key type make

FC - set key type make/break

FB - set key type typematic

FA - set all keys typematic/make/break

F9 - set all keys make

F8 - set all keys make/break

F7 - set all keys typematic

F6 - set default

F5 - default disabled

F4 - enable

F3 - set typematic rate/delay

F2 - Read ID

F1 -

F0 - select alternate scan codes

EF -

EE - Echo

ED - set/reset status indicators

HT82K28A

February 16, 2000

Resend - FE

Send the last code to the system
Note: * No FA response

Reset - FF

Disable keyboard

Send an ACK to the system, the keyboard

acknowledges the command with an ACK

and ensures the system accepts the ACK be-

fore executing the command

The system sets CLK=DATA=high for

500ms: acceptance of ACK

The system can issue any command to the

KB within the 500ms period mentioned

above to override FF

If no override, the system performs its BAT

and enters mode 2 (even if it is set to be

mode 3)

Select alternate scan code - F0

Send an ACK to the system

Clears both output buffer and the typematic

key

Accept option byte

Set all keys - F7, F8, F9, FA

FA: Set all keys to typematic/make/break

F9: Set all keys to make

F8: Set all keys to make/break

F7: Set all keys to typematic

Send an ACK to the system

Clear output buffer

Set all keys to the type indicated by the com-

mand

Set default - F6

Send an ACK to the system

Clear the output buffer

Set to default key states: Default key type

typematic rate/delay

Set key type - FB,FC,FD

FB : Set key type - Typematic

FC : Set key type - Make/Break

FD : Set key type - Make

The keyboard responds with ACK, clears its

output buffer and prepares to receive key

identification

Key identification is accomplished by the

system identifying each key by its scan code

value as defined in scan code set3.

Only scan code set3 values are valid for key

identification

The type of each identified key is set to the

value indicated by the command

These commands can be sent using any

scan code set, but affect only the operation

of scan code set3

Set LED - ED

Send ACK to the system

Discontinue scanning

Wait for the option from the system

Respond with ACK to the system

Set indicator

If command comes from the system in place

of option, discard the set LED function and

then process the new command

LED default after power on - all off

Set default disable - do not change the LEDs

Set typematic rate/delay - F3

Send an ACK to the system

Stop scanning

Wait for the system typematic rate and de-

lay

Send an ACK to the system

Set rate/delay

Bit 6,5 delay

Bit 4,3,2,1,0 typematic rate

Bit 7=0 (always)
Delay= (1+bit6,bit5) ´ 250ms

Typematic rate= 1/period

...where period= (8+A) ´ (2^B) ´ 0.00417

...where A= binary value of bit 2, 1 and 0

...where B= binary value of bit 4 and 3

HT82K28A

February 16, 2000

b4~b0 Typematic

rate

b4~b0 Typematic

rate

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

01011

01100

01101

01110

01111

30.0

26.7

24.0

21.8

20.0

18.5

17.1

16.0

15.0

13.3

12.0

10.9

10.0

9.2

8.6

8.0

10000

10001

10010

10011

10100

10101

10110

10111

11000

11001

11010

11011

11100

11101

11110

11111

7.5

6.7

6.0

5.5

5.0

4.6

4.3

4.0

3.7

3.3

3.0

2.7

2.5

2.3

2.1

2.0

Default

delay: 500ms± 20%

typematic rate=10.9 characters/sec± 20%

Commands to the system
00: keyboard detect a error/overrun (set 2, set 3)
AB,83: keyboard ID

AA: BAT completion

FC: BAT failure

EE: Echo

FA: Acknowledge

FE: Resend

FF: Keyboard detects a overrun (set 1)

FA: Acknowledge

If the KB (Keyboard) receives any valid input

except EE (echo) and resend (FE) then send

an FA to the system first.

If the command is EE, then send an EE back

to the system.

If the command is FE, then send the last key

code to system.

If there is an interrupt while sending FA, the

KB discards the FA and accepts the command

from the system and processes it.

00/FF: Key overrun

If the keyboard detects an overrun error, the

KB sends an overrun error code to the system.

mode 1: FF

mode 2,3: 00

FE: Resend

The KB issues an FE when there is a parity

error in transmission.

Data communications

Data output

If CLK=0, no transmission (keyboard inhib-

ited).

If CLK=1, DATA=0, no transmission (sys-

tem request to send).

If CLK=1, DATA=1, transmission permit-

ted.

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 at least every 60ms.

If line contention occurs (system brings the

clock low before the tenth clock), set

clock=data=high.

Data input

The system overrides the clock line for at

least 60ms

The keyboard checks the state of the clock

line at intervals of no more than 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.

Key code set 1

Key Number

Make/Break Code

Key Number

Make/Break Code

29 / A9

02 / 82

03 / 83

04 / 84

05 / 85

06 / 86

07 / 87

08 / 88

09 / 89

0A / 8A

0B / 8B

0C / 8C

0D / 8D

7D / FD

0E / 8E

0F / 8F

10 / 90

11 / 91

12 / 92

13 / 93

14 / 94

15 / 95

16 / 96

17 / 97

18 / 98

19 / 99

1A / 9A

1B / 9B

2B / AB

3A / BA

1E / 9E

1F / 9F

20 / A0

21 / A1

22 / A2

23 / A3

24 / A4

25 / A5

26 / A6

27 / A7

28 / A8

2B / AB

1C / 9C

2A / AA

56 / D6

2C / AC

2D / AD

2E / AE

2F / AF

100

101

102

103

104

105

106

107

108

110

112

113

114

115

116

117

118

119

120

121

122

123

125

131

132

133

30 / B0

31 / B1

32 / B2

33 / B3

34 / B4

35 / B5

73 / F3

36 / B6

1D / 9D

38 / B8

39 / B9

E0 38 / E0 B8

E0 1D / E0 9D

45 / C5

47 / C7

4B / CB

4F / CF

48 / C8

4C / CC

50 / D0

52 / D2

37 / B7

49 / C9

4D / CD

51 / D1

53 / D3

4A / CA

4E / CE

7E / FE

E0 1C / E0 9C

01 / 81

3B / BB

3C / BC

3D / BD

3E / BE

3F / BF

40 / C0

41 / C1

42 / C2

43 / C3

44 / C4

57 / D7

58 / D8

46 / C6

7B / FB

79 / F9

70 / F0

HT82K28A

February 16, 2000

Key code set 1

Key Number

Base Case

Shift+Num

Left-Shift

Right-Shift

Num Lock

75
76
79
80
81
83
84
85
86
89

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 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

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

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

L Win

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

R Win

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

APP

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

When both shift keys are held down:

key number 75

Both Shift

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

Key Number

Base

+Left-Shift

+Right-Shift

E0 35

/E0 B5

E0 AA E0 35

/E0 B5 E0 2A

E0 B6 E0 35

/E0 B5 E0 36

when both shift keys are held down:

key number 95

Both Shift

E0 AA E0 B6 E0 35

/E0 B5 E0 2A E0 36

Key Number

Base

+Left-Shift

+Right-Shift

124

E0 2A E0 37

/E0 B7 E0 AA

E0 37

/E0 B7

54/D4

Key Number

Base

+Ctrl

126

E1 1D 45 E1 9D C5

E0 46 E0 C6

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

ACPI Key

Make

Break

Windows Virtual Key

Power

E0 5E

E0 DE

N/A

Sleep

E0 5F

E0 DF

N/A

Wake

E0 63

E0 E3

N/A

HT82K28A

February 16, 2000

Key code set 2

Key Number

Make/Break Code

Key Number

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

6A / F0 6A

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

5D / F0 5D

58 / F0 58

1C / F0 1C

1B / F0 1B

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

5D / F0 5D

5A / F0 5A

12 / F0 12

61 / F0 61

1A / F0 1A

22 / F0 22

21 / F0 21

2A / F0 2A

100

101

102

103

104

105

106

107

108

110

112

113

114

115

116

117

118

119

120

121

122

123

125

131

132

133

32 / F0 32

31 / F0 31

3A / F0 3A

41 / F0 41

49 / F0 49

4A / F0 4A

51 / F0 51

59 / F0 59

14 / F0 14

11 / F0 11

29 / F0 29

E0 11 / E0 F0 11

E0 14 / E0 F0 14

77 / F0 77

6C / F0 6C

6B / F0 6B

69 / F0 69

75 / F0 75

73 / F0 73

72 / F0 72

70 / F0 70

7C / F0 7C

7D / F0 7D

74 / F0 74

7A / F0 7A

71 / F0 71

7B / F0 7B

79 / F0 79

6D / F0 6D

E0 5A / E0 F0 5A

76 / F0 76

05 / F0 05

06 / F0 06

04 / F0 04

0C / F0 0C

03 / F0 03

0B / F0 0B

83 / F0 83

0A / F0 0A

01 / F0 01

09 / F0 09

78 / F0 78

07 / F0 07

7E / F0 7E

67 / F0 67

64 / F0 64

13 / F0 13

HT82K28A

February 16, 2000

Key code set 2

Key Number

Base Case

Shift+Num

Left-Shift

Right-Shift

Num Lock

75
76
79
80
81
83
84
85
86
89

E0 70

/E0 F0 72

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 F0 12 E0 70

/E0 F0 70 E0 12

E0 F0 12 E0 70

/E0 F0 71 E0 12

E0 F0 12 E0 70

/E0 F0 6B E0 12

E0 F0 12 E0 70

/E0 F0 6C E0 12

E0 F0 12 E0 70

/E0 F0 69 E0 12

E0 F0 12 E0 70

/E0 F0 75 E0 12

E0 F0 12 E0 70

/E0 F0 72 E0 12

E0 F0 12 E0 70

/E0 F0 7D E0 12

E0 F0 12 E0 70

/E0 F0 7A E0 12

E0 F0 12 E0 70

/E0 F0 74 E0 12

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

L Win

E0 1F

E0 F0 12 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

R Win

E0 27

E0 F0 12 27

E0 F0 59 E0 27

E0 59 E0 27

/E0 F0 27

/E0 F0 27 E0 12

/E0 F0 27 E0 59

/E0 F0 27 E0 F0 12

APP

E0 2F

E0 F0 12 2F

E0 F0 59 E0 2F

E0 59 E0 2F

/E0 F0 2F

/E0 F0 2F E0 12

/E0 F0 2F E0 59

/E0 F0 2F E0 F0 59

When both shift keys are held down:

key number 75

Both Shift

E0 F0 12 E0 F0 59 E0 70

/E0 F0 70 E0 12 E0 59

Key Number

Base

+Left-Shift

+Right-Shift

E0 4A

/E0 F0 4A

E0 F0 12 E0 4A

/E0 F0 4A E0 12

E0 F0 59 E0 4A

/E0 F0 4A E0 59

When both shift keys are held down:

key number 95

Both Shift

E0 F0 12 E0 F0 59 E0 4A

/E0 F0 4A E0 12 E0 59

Key Number

Base

+Shift / +Ctrl

+Alt

124

E0 12 E0 7C

/E0 F0 7C E0 12

E0 7C

/E0 F0 7C

84 / F0 84

Key Number

Base

+Ctrl

126

E1 14 77 E1 F0 14 F0 77

E0 7E E0 F0 7E

Note: this key is not typematic, all associated scan codes occur on the make of the key.

ACPI key

Make

Break

Windows Virtual Key

Power

E0 37

E0 F0 37

N/A

Sleep

E0 3F

E0 F0 3F

N/A

Wake

E0 5E

E0 F0 5E

N/A

HT82K28A

February 16, 2000

Key code set 3

Key #

Make/

Break Code Note

Default Key

State

Key #

Make/

Break Code Note

Default Key

State

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

Typematic

Make/Break

100

101

102

103

104

59 / F0 59

11 / F0 11

19 / F0 19

29 / F0 29

39 / F0 39

58 / E0 58

67 / F0 67

64 / F0 64

61 / F0 61

6E / F0 6E

65 / F0 65

63 / F0 63

60 / F0 60

6F / F0 60

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

71 / F0 71

Make/Break

Typematic

Make Only

Typematic

Make Only

Typematic

Make Only

Typematic

Make Only

HT82K28A

February 16, 2000

Key #

Make/

Break Code Note

Default Key

State

Key #

Make/

Break Code Note

Default Key

State

1C / F0 1C

1B / F0 1B

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

5D / F0 5D

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

4A / F0 4A

51/ F0 51

Typematic

Make/Break

Typematic

105

106

107

108

110

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

131

132

133

L Win

R Win

APP

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

85 / F0 85

86 / F0 86

87 / F0 87

8B / F0 8B

8C / F0 8C

8D / F0 8D

Make Only

Typematic

Make Only

Make/Break

* Different from code set 2

HT82K28A

February 16, 2000

Timing Diagrams

Data output

Keyboard data input

HT82K28A

February 16, 2000

( 1 )

( 3 )

( 4 )

I / O

I n h i b i t

2 n d

C L K

1 0 t h

C L K

1 1 t h

C L K

D A T A

S t a r t B i t

B i t 0

P a r i t y B i t

S t o p B i t

T 7

T 8

T 9

( 5 )

( 7 )

C L K

( 6 )

T i m i n g P a r a m e t e r

w h e n t h e a u x i l i a r y d e v i c e s a m p l e s D A T A

T 7

D u r a t i o n o f C L K i n a c t i v e

T 8

D u r a t i o n o f C L K a c t i v e

T 9

T i m e f r o m i n a c t i v e t o a c t i v e C L K t r a n s i t i o n , u s e d t o t i m e

M i n / M a x

1 s t

C L K

( 2 )

9 t h

C L K

( 8 )

( 5 )

3 0 / 5 0 m s e c
3 0 / 5 0 m s e c
5 / 2 5 m s e c

( 1 )

( 3 )

( 4 )

1 s t

C L K

2 n d

C L K

1 0 t h

C L K

1 1 t h

C L K

D A T A

S t a r t B i t

B i t 0

P a r i t y B i t

S t o p B i t

T 5

T 3

T 4

T 1

T 2

( 2 )

( 5 ) ( 7 )

C L K

( 6 )

T i m i n g P a r a m e t e r

t h e a u x i l i a r y d e v i c e d o e s n o t s t a r t a n o t h e r t r a n s m i s s i o n

T 1

D A T A t r a n s i t i o n t o t h e f a l l i n g e d g e o f C L K

T 2

R i s i n g e d g e o f C L K t o D A T A t r a n s i t i o n

T 3

D u r a t i o n o f C L K i n a c t i v e

T 4

D u r a t i o n o f C L K a c t i v e

T 5

T i m e t o a u x i l i a r y d e v i c e i n h i b i t a f t e r c l o c k 1 1 t o e n s u r e

M i n / M a x

5 / T 4 - 5 m s e c

5 / 2 5 m s e c

3 0 / 5 0 m s e c
> 0 / 5 0 m s e c

3 0 / 5 0 m s e c

Standard Holtek Win98 keyboard

L-CTRL WAKE-UP R-CTRL

SLEEP

POWER

PAUSE

K131

ESC

TAB

K132

K45

CAP

LOCK

K133

K56

}

]

(

APP

)

K42

;

{

[

R-ALT

L-ALT

SCR

LOCK

R10

F10

F12

ENTER

F11

K14

R11

POWER

DEL

DOWN

Arrow

NUM

LOCK

SPACE

NUM 1

NUM 4

NUM 7

R12

SLEEP INSERT

RIGHT

Arrow

NUM /

NUM 0

NUM 2

NUM 5

NUM 8

R13

PG DN

PG UP

NUM -

NUM *

NUM .

NUM 3

NUM 6

NUM 9

R14

END

HOME

LEFT

Arrow

NUM

ENTER

K107

NUM +

R15

K94

R-SHF

L-SHF

WAKE UP

R16

K129

L-WIN

K130

R17

K109

R-WIN

HT82K28A

February 16, 2000

HT82K28A

February 16, 2000

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 no responsibility 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.

Holtek Semiconductor Inc. (Headquarters)

No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.

Tel: 886-3-563-1999

Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)

5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.

Tel: 886-2-2782-9635

Fax: 886-2-2782-9636

Fax: 886-2-2782-7128 (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: 852-2-745-8288

Fax: 852-2-742-8657

Document Outline

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: HT82K28A

Document Outline

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: HT82K28A