Datasheet EM83055H Datasheet (ELAN)

GENERAL DESCRIPTION

The EM83055H microcontroller is dedicated to a keyboard encoder ,specially designed for IBM PC AT and
all compatible machines. The EM83055H controll all scan codes, three LEDs status, scan timing and communications
between the keyboard and PC. It is easy to implement a high performance, low cost keyboard with the minimal
external components.

FEATURES

• Low cost - eliminate need external components.

• Phantom key detects.

• RC oscillator ( 1.8432MHz ).

• Support scan code set 1 ,2 and 3.

• Support PC AT and PS/2 keyboard .

• Low power CMOS device technology.

• Internal pull-up resistor.

• Tri-state outputs for easy board application.

• Built-in 4K ROM.

• Support WINDOWS

• 104/107 keys with multi-media or other special application keyboard encoder.

• WINDOWS is registered trademarks of Microsoft corperation.

TM

EM83055H

KEYBOARD ENCODER

95, 98, 2000, ME keys.

APPLICATION

• IBM PC AT or compatible machine keyboard.

• IBM PS/2 model 30,50,60,80 or compatible machine keyboard.

• Japanese keyboard.

• Korean keyboard.

• Brazilian keyboard.

• European keyboard.

PIN ASSIGNMENTS

P91
P92
P93
P94
P95
P50
P51
P52
P53
P54

P90

CLK

DATA

OSCO

GND

543

2

1

6
7
8
9

10

EM83055H

11
12
13
14
15

1617181920212223242526

P55

P56

P57

P80

P81

P82

P83

R_OSCI

VDD

393837

P84

P85

CAPS

P86

36
35
34
33
32
31
30
29
28
27

P87

NUM
SCROLL
P67
P66
P65
P64
P63
P62
P61
P60

* This specification are subject to be changed without notice.

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KEYBOARD ENCODER

PIN DESCRIPTIONS

Symbol I/O Function

P50 O Column 3 Low output scan line, 3-state
P51 O Column 4 Low output scan line, 3-state

P52 O Column 5 Low output scan line, 3-state
P53 O Column 6 Low output scan line, 3-state
P54 O Column 7 Low output scan line, 3-state
P55 O Column 14 Low output scan line, 3-state
P56 O Column 13 Low output scan line, 3-state
P57 O Column 12 Low output scan line, 3-state
P80 O Column 11 Low output scan line, 3-state
P81 O Column 15 Low output scan line, 3-state
P82 O Column 10 Low output scan line, 3-state
P83 O Column 8 Low output scan line, 3-state
P84 O Column 9 Low output scan line, 3-state
P85 O Column 0 Low output scan line, 3-state
P86 O Column 16 Low output scan line, 3-state
P87 O Column 17 Low output scan line, 3-state
P90 O Column 1 Low output scan line, 3-state
P91 O Column 2 Low output scan line, 3-state
VSS I Ground
SCROLL O Scroll Lock Indicator
NUM O NUM Lock Indicator
CAPS O Caps Lock Indicator
P60 I Row 0 Input scan line, internal pull high ( 17KΩ )
P61 I Row 1 Input scan line, internal pull high ( 17KΩ )
P62 I Row 2 Input scan line, internal pull high ( 17KΩ )
P63 I Row 3 Input scan line, internal pull high ( 17KΩ )
P64 I Row 4 Input scan line, internal pull high ( 17KΩ )
P65 I Row 5 Input scan line, internal pull high ( 17KΩ )
P66 I Row 6 Input scan line, internal pull high ( 17KΩ )
P67 I Row 7 Input scan line, internal pull high ( 17KΩ )
CLK I/O CLOCK line for IBM communication , internal pull high ( 2.2KΩ )
DATA I/O DATA line for IBM communication , internal pull high ( 2.2KΩ )
V

DD

OSCO O CLOCK output
R_OSCI I Connect 51K OHM resistor for 1.8432 MHz oscillation

I +5V Power Supply

EM83055H

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KEYBOARD ENCODER

FUNCTION DESCRIPTIONS

Keyboard buffer

The keyboard will buffer 16 bytes in a first-in-first-out order when the system is able to receive scan codes
from the keyboard. The response codes and repeated codes will not be buffered. If keystrokes generate a
multiple-byte sequence, the entire sequence must fit into the buffer or the keystroke is discarded and a buffer­overrun condition occurs.

Power-on Reset and self test

The duration of the keyboard Power-on-Reset(POR) should be within 150 milliseconds and 2 seconds after
the power is applied to the keyboard.
After executing POR , the keyboard executes a self test. The LEDs are turned on at the beginning and off at
the end of the self test. The self test takes a minimum 300 milliseconds and a maximum 500 milliseconds.
If the self test is successful, a completion code AA hex is sent to the system and the keyboard starts scanning.
If the self test fails, and error code is sent, the keyboard is disabled and waits for a command from the system.
The completion codes are sent between 450 milliseconds and 2.5 seconds after POR, and between 300 and
500 milliseconds after a RESET command is acknowledged.

EM83055H

Keyboard data output

When the keyboard is ready to send data to the system, it first checks clock and data lines. If either one is in
the low state, data is stored in the keyboard buffer. If both are in the high state, keyboard starts clocking data
out. Data will be valid before the trailing edge and after the leading edge of the clock pulse. During the
transmission the keyboard checks the clock line at least every 60 microseconds . If the system lowers the clock
lines before the leading edge of the 10th clock, the keyboard should stop sending, then buffer the data and
return clock and data lines to high state.

Keyboard data input

When the system is ready to send data to the keyboard, it first checks clock line to see if keyboard is sending
data. If keyboard is not sending data or it is sending data but has not reached the 10th clock, the system can
inhibit the interface by forcing the clock line low for more than 60 microseconds and prepares to send data.
The keyboard checks clock line status at least every 5 milliseconds. If a system Request to Send(RTS) is
detected, the keyboard clocks 11 bits in. After the 10th bit, the keyboard checks for a high state in data line
then pulls it low and clocks one more bit to signal the system that data has been received. If data is low after
the 10th bit, it indicates a frame error. The keyboard should continue to count until data line goes high, then
pulls it low and issues a RESEND to the system.

Command from the system

The system can send commands to the keyboard at any time. The keyboard needs to respond within 20
milliseconds, unless the system prevents keyboard output, when doing self test or executing a RESET.
The following are the keyboard input commands and the actions that keyboard needs to take.

Set /Reset Status indicators ( Hex ED )

- Responds ACK.

- Receives option byte.

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- Responds ACK.

- Updates status indicators.

- Returns to previous scanning state.

Echo ( Hex EEH )

- Responds with EE hex.

- Returns to previous scanning state.

Invalid commands ( Hex EF and F1 )

- Returns a RESEND command.

- Returns to previous scanning state.

Select Alternate Scan Codes ( Hex F0 )

- Responds ACK.

- Clears output buffer.

- Sets the default typematic rate/delay.

- Clears last typematic key.

- Receives option byte.

- Responds ACK.

- Option byte =
01 : selects scan code set 1
02 : selects scan code set 2
03 : selects scan code set 3

- Returns to previous scanning rate.

EM83055H

KEYBOARD ENCODER

Read ID (F2)

- Responds with ACK.

- Discontinues scanning.

- Sends two ID bytes. The second byte will be sent within 500 uS after first byte.

- Resumes scanning.

Set Typematic Rate/Delay ( Hex F3 )

- Responds ACK.

- Receives rate/delay value byte

- Responds ACK.

- Set rate/delay (* Note 1)

- Returns to previous scanning state.

* Note 1

B

1. Repeat period = ( 8+A ) x ( 2

) x 0.00417 seconds
A : binary value of bits 2, 1, and 0.
B : binary value of bits 4 and 3.

2. Delay = ( C +1 ) x 250 milliseconds
C : binary value of bits 6 and 5. Bit 7 is always 0.

* This specification are subject to be changed without notice.

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KEYBOARD ENCODER

bit 4~ bit 0 typematic rate ± 20% bit 4~ bit 0 typematic rate ± 20%

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 8.6 11110 2.1
01111 8.0 11111 2.0

EM83055H

3. Default rate = 10.9 chars/sec + 20%
Default delay = 500 mS ± 20%

Enable ( Hex F4 )

- Responds with ACK.

- Clears output buffer.

- Clears last typematic key.

- Start scanning.

Default Disable (Hex F5)

- Responds with ACK.

- Resets all conditions to power-on state.

- Clears output buffer.

- Sets the default key type ( scan code set 3 only ).

- Set the default typematic rate/delay.

- Clears last typematic key.

- Stops scanning,

Set Default (Hex F6 )

- Responds with ACK.

- Resets all conditions to power-on state.

- Clears output buffer.

- Sets the default key type ( scan code set 3 only ).

- Set the default typematic rate/delay.

- Clears last typematic key.

- Continues scanning,

Set All Keys ( Hex F7,F8,F9,FA )

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- Responds ACK.

- Clears output buffer.

- Sets all key type (affect only scan code set 3 operation).

F7 : Typematic
F8 : Make/Break
F9 : Make
FA : Typematic/Make/Break

- Returns to previous scanning rate.

Set Key Type ( Hex FB,FC,FD )

- Responds ACK.

- Clears output buffer.

- Receives key ID byte

- Responds ACK.

- Sets key ID type (affect only scan code set 3 operation).

FB : Typematic
FC : Make/Break
FD : Make

- Returns to previous scanning rate.

EM83055H

KEYBOARD ENCODER

Resend ( Hex FE )

- Sends the previous output again. If the previous byte is RESEND, the last byte before RESEND shall be sent.

Reset ( Hex FF )

- Responds ACK.

- Checks clock and data lines - Reset in the high state for at least 500 microseconds or receives another command.

- Default to scan code set 2.

Command to the system

The following are the keyboard output commands.

Acknowledge ( Hex FA )

The keyboard sends an acknowledge in response to any valid command from the system except for RESEND
and ECHO.

BAT Completion Code ( Hex AA )

This command is issued after successful completion of keyboard self test.

Echo ( Hex EE )

The keyboard sends this code in response to an ECHO command.

* This specification are subject to be changed without notice.

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EM83055H

KEYBOARD ENCODER

Keyboards ID ( Hex 83AB )

The 2 byte ID is issued to respond to READ ID command. The low byte is sent first, followed by the high byte.

Keyboard buffer Overrun ( Hex 00 or FF )

If keyboard buffer overflows, the overrun code will replace the last byte in the buffer. If the keyboard is using
scan code set 1 , the code is hex FF. For sets 2 and 3, the code is hex 00.

Resend ( Hex FE )

When the keyboard receives an invalid input or any input with incorrect parity, the RESEND command is sent.

Keyboard Scan Code Table

The keyboard contains 3 scan code sets. The system defaults to scan code set 2, but can be switched to set 1 or
set 3 . The following tables show the key numbers and three scan code sets in hexadecimal values. All the keys
are typematics except for the pause key. When a key is pressed down, the make scan code is sent to the
system. When the key is released, its break code is sent. If two or more keys are held down, only the last key
pressed repeats at the typematic rate. Typematic operation stops when the last pressed key is released, even if
other keys are being released or some other keys are still held down.

The following table shows three scan code sets used in the keyboard.

scan code set 1

Key Make code Break code Key Make code Break code

`(~) 29 A9 X 2D AD

10282C2EAE
20383V2FAF
30484B30B0
40585N31B1
50686M32B2
6 07 87 ,(<) 33 B3
7 08 88 .(>) 34 B4
8 09 89 /(?) 35 B5
9 0A 8A SHIFT_R 36 B6
0 0B 8B CTRL_L 1D 9D

-(-) 0C 8C ALT_L 38 B8

=(+) 0D 8D SPACE 39 B9

BACK SPACE 0E 8E ALT_R E0 38 E0 B8

TAB 0F 8F CTRL_R E0 1D E0 9D

Q 10 90 NUM 45 C5

W1191(7)47C7

E 1292 (4)4BCB
R1393(1)4FCF
T 1494 (8)48C8
Y1595(5)4CCC

* This specification are subject to be changed without notice.

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EM83055H

KEYBOARD ENCODER

Key Make code Break code Key Make code Break code

U1696 (2)50D0

I1797 (θ)52D2

O1898(*)37B7

P1999(9)49C9
[({) 1A 9A (6) 4D CD
](}) 1B 9B (3) 51 D1

\( )@1 2B AB (DEL) 53 D3
CAPS 3A BA (-) 4A CA

A 1E 9E (+) 4E CE

S 1F 9F (ENTER) E0 1C E0 9C

D 20 A0 ESC 01 81

F21A1F13BBB

G22A2F23CBC
H23A3F33DBD

J24A4F43EBE

K25A5F53FBF

L26A6F640C0

;(:) 27 A7 F7 41 C1
'(") 28 A8 F8 42 C2

K42 @2 2B AB F9 43 C3

ENTER 1C 9C F10 44 C4

SHIFT_L 2A AA F11 57 D7

K45 @2 56 D6 F12 58 D8

Z 2C AC SCROLL 46 C6

Key Base Case,or Shift + Nun Lock Shift Case @3 Num Lock

Make/Break Make/Break Make/Break

INS E0 52 / E0 D2 E0 AA E0 52 E0 2A E0 52

/ E0 D2 E0 2A / E0 D2 E0 AA

DEL E0 53 / E0 D3 E0 AA E0 53 E0 2A E0 53

/ E0 D3 E0 2A / E0 D3 E0 AA

LEFT E0 4B / E0 CB E0 AA E0 4B E0 2A E0 4B

/ E0 CB E0 2A / E0 CB E0 AA

HOME E0 47 / E0 C7 E0 AA E0 47 E0 2A E0 47

/ E0 C7 E0 2A / E0 C7 E0 AA

END E0 4F / E0 CF E0 AA E0 4F E0 2A E0 4F

/ E0 CF E0 2A / E0 CF E0 AA

UP E0 48 / E0 C8 E0 AA E0 48 E0 2A E0 48

/ E0 C8 E0 2A / E0 C8 E0 AA

DOWN E0 50 / E0 D0 E0 AA E0 50 E0 2A E0 50

/ E0 D0 E0 2A / E0 D0 E0 AA

PAGE UP E0 49 / E0 C9 E0 AA E0 49 E0 2A E0 49

/ E0 C9 E0 2A / E0 C9 E0 AA

PAGE E0 51 / E0 D1 E0 AA E0 51 E0 2A E0 51
DOWN / E0 D1 E0 2A / E0 D1 E0 AA
RIGHT E0 4D / ED CD E0 AA E0 4D E0 2A E0 4D

/ E0 CD E0 2A / E0 CD E0 AA

* This specification are subject to be changed without notice.

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Key Scan Code Make/Break Shift Case Make/Break @3

(/) E0 35 / E0 B5 E0 AA E0 35 / E0 B5 E0 2A

Key Scan Code Ctrl Case, Shift Case Alt Case

Make/Break Make/ Break Make/Break

PRINT E0 2A E0 37 E0 37 / E0 B7 54 / D4

/ E0 B7 E0 AA

Key Make Code Ctrl Key Pressed

PAUSE @4 E1 1D 45 E1 9D C5 E0 46 E0 C6

Note .

@1 : 101-key keyboard only.
@2 : 102-key keyboard only.
@3 : If the left Shift key is held down, the AA/2A shift make and break is sent with the other scan codes.

If the right Shift key is held down, B6/36 is sent. If both Shift keys are down, both sets of codes are
sent with the other scan code.

@4 : This key is not typematic. All associated scan codes occur on the make of the key.

EM83055H

KEYBOARD ENCODER

scan code set 2

Key Make code Break code Key Make code Break code

`(~) 0E F0 0E X 22 F0 22

1 16 F0 16 C 21 F0 21
2 1E F0 1E V 2A F0 2A
3 26 F0 26 B 32 F0 32
4 25 F0 25 N 31 F0 31
5 2E F0 2E M 3A F0 3A
6 36 F0 36 ,(<) 41 F0 41
7 3D F0 3D .(>) 49 F0 49
8 3E F0 3E /(?) 4A F0 4A
9 46 F0 46 SHIFT_R 59 F0 59
0 45 F0 45 CTRL_L 14 F0 14

-(-) 4E F0 4E ALT_L 11 F0 11

=(+) 55 F0 55 SPACE 29 F0 29

BACK SPACE 66 F0 66 ALT_R E0 11 E0 F0 11

TAB 0D F0 0D CTRL_R E0 14 E0 F0 14

Q 15 F0 15 NUM 77 F0 77

W 1D F0 1D (7) 6C F0 6C

E 24 F0 24 (4) 6B F0 6B

R 2D F0 2D (1) 69 F0 69

T 2C F0 2C (8) 75 F0 75
Y 35 F0 35 (5) 73 F0 73
U 3C F0 3C (2) 72 F0 72

I 43 F0 43 (0) 70 F0 70

O 44 F0 44 (*) 7C F0 7C

P 4D F0 4D (9) 7D F0 7D

[({) 54 F0 54 (6) 74 F0 74
](}) 5B F0 5B (3) 7A F0 7A

\( )@5 5D F0 5D (DEL) 71 F0 71

* This specification are subject to be changed without notice.

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EM83055H

KEYBOARD ENCODER

Key Make code Break code Key Make code Break code

CAPS 58 F0 58 (-) 7B F0 7B

A 1C F0 1C (+) 79 F0 79

S 1B F0 1B (ENTER) E0 5A E0 F0 5A
D 23 F0 23 ESC 76 F0 76

F 2B F0 2B F1 05 F0 05
G 34 F0 34 F2 06 F0 06
H 33 F0 33 F3 04 F0 04

J 3B F0 3B F4 0C F0 0C

K 42 F0 42 F5 03 F0 03

L 4B F0 4B F6 0B F0 0B

;(:) 4C F0 4C F7 83 F0 83

'(") 52 F0 52 F8 0A F0 0A
K42 @6 5D F0 5D F9 01 F0 01
ENTER 5A F0 5A F10 09 F0 09

SHIFFT_L 12 F0 12 F11 78 F0 78

K45 @6 61 F0 61 F12 07 F0 07

Z 1A F0 1A SCROLL 7E F0 7E

Key Base Case,or Shift Case @7 Num Lock

Shift + Nun Lock Make/Break Make/Break

Make/Break

INS E0 70 / E0 F0 70 E0 F0 12 E0 70 E0 12 E0 70

/ E0 F0 70 E0 12 / E0 F0 70 E0 F0 12

DEL E0 71 / E0 F0 71 E0 F0 12 E0 71 E0 12 E0 71

/ E0 F0 71 E0 12 / E0 F0 71 E0 F0 12

LEFT E0 6B / E0 F0 6B E0 F0 12 E0 6B E0 12 E0 6B

/ E0 F0 6B E0 12 / E0 F0 6B E0 F0 12

HOME E0 6C / E0 F0 6C E0 F0 12 E0 6C E0 12 E0 6C

/ E0 F0 6C E0 12 / E0 F0 6C E0 F0 12

END E0 69 / E0 F0 69 E0 F0 12 E0 69 E0 12 E0 69

/ E0 F0 69 E0 12 / E0 F0 69 E0 F0 12

UP E0 75 / E0 F0 75 E0 F0 12 E0 75 E0 12 E0 75

/ E0 F0 75 E0 12 / E0 F0 75 E0 F0 12

DOWN E0 72 / E0 F0 72 E0 F0 12 E0 72 E0 12 E0 72

/ E0 F0 72 E0 12 / E0 F0 72 E0 F0 12

PAGE UP E0 7D / E0 F0 7D E0 F0 12 E0 7D E0 12 E0 7D

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

PAGE DOWN E0 7A / E0 F0 7A E0 F0 12 E0 7A E0 12 E0 7A

/ E0 F0 7A E0 12 / E0 F0 7A E0 F0 12

RIGHT E0 74 / E0 F0 74 E0 F0 12 E0 74 E0 12 E0 74

/ E0 F0 74 E0 12 / E0 F0 74 E0 F0 12

Key Scan Code Make/Break Shift Case Make/Break @7

(/) E0 4A / E0 F0 4A E0 F0 12 E0 4A / E0 F0 4A E0 12

Key Scan Code Ctrl Case, Shift Case Alt Case

Make/Break Make/ Break Make/Break

PRINT E0 12 E0 7C E0 7C / E0 F0 7C 84 / F0 84

/ E0 F0 7C E0 F0 12

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PAUSE @8 E1 14 77 E1 F0 14 F0 77 E0 7E E0 F0 7E

Note .

@5 : 101-key keyboard only.
@6 : 102-key keyboard only.
@7 : If the left Shift key is held down, the F0 12/12 shift make and break is sent with the other scan codes.

If the right Shift key is held down, F0 59/59 is sent. If both Shift keys are down, both sets of codes
are sent with the other scan code.

@8 : This key is not typematic. All associated scan codes occur on the make of the key.

scan code set 3

BACK SPACE 66 F0 66 Typematic

EM83055H

KEYBOARD ENCODER

Key Make Code Ctrl Key Pressed

Key Make Code Break Code Default Key State

`(~) 0E F0 0E Typematic

1 16 F0 16 Typematic
2 1E F0 1E Typematic
3 26 F0 26 Typematic
4 25 F0 25 Typematic
5 2E F0 2E Typematic
6 36 F0 36 Typematic
7 3D F0 3D Typematic
8 3E F0 3E Typematic
9 46 F0 46 Typematic
0 45 F0 45 Typematic

-(_) 4E F0 4E Typematic

=(+) 55 F0 55 Typematic

TAB 0D F0 0D Typematic

Q 15 F0 15 Typematic

W 1D F0 1D Typematic

E 24 F0 24 Typematic

R 2D F0 2D Typematic

T 2C F0 2C Typematic
Y 35 F0 35 Typematic
U 3C F0 3C Typematic

I 43 F0 43 Typematic

O 44 F0 44 Typematic

P 4D F0 4D Typematic

[({) 54 F0 54 Typematic
](}) 5B F0 5B Typematic

\( ) @9 5C F0 5C Typematic

CAPS 14 F0 14 Make/Break

A 1C F0 1C Typematic

S 1B F0 1B Typematic
D 23 F0 23 Typematic

F 2B F0 2B Typematic
G 34 F0 34 Typematic
H 33 F0 33 Typematic

* This specification are subject to be changed without notice.

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KEYBOARD ENCODER

Key Make Code Break Code Default Key State

J 3B F0 3B Typematic
K 42 F0 42 Typematic

L 4B F0 4B Typematic

;(:) 4C F0 4C Typematic
'(") 52 F0 52 Typematic

K42 @10 53 F0 53 Typematic

ENTER 5A F0 5A Typematic
SHIFT_L 12 F0 12 Make/Break
K45 @10 13 F0 13 Typematic

Z 1A F0 1A Typematic
X 22 F0 22 Typematic
C 21 F0 21 Typematic
V 2A F0 2A Typematic
B 32 F0 32 Typematic
N 31 F0 31 Typematic

M 3A F0 3A Typematic
,(<) 41 F0 41 Typematic
.(>) 49 F0 49 Typematic

/(?) 4A F0 4A Typematic

SHIFT_R 59 F0 59 Make/Break

CTRL_L 11 F0 11 Make/Break

ALT_L 19 F0 19 Make/Break
SPACE 29 F0 29 Typematic
ALT_R 39 F0 39 Make only

CTRL_R 58 F0 58 Make only

INS 67 F0 67 Make only

DEL 64 F0 64 Typematic

LEFT 61 F0 61 Typematic

HOME 6E F0 6E Make only

END 65 F0 65 Make only

UP 63 F0 63 Typematic

DOWN 60 F0 60 Typematic

PAGE UP 6F F0 6F Make only

PAGE DOWN 6D F0 6D Make only

RIGHT 6A F0 6A Typematic

NUM 76 F0 76 Make only

(7) 6C F0 6C Make only
(4) 6B F0 6B Make only
(1) 69 F0 69 Make only

(/) 77 F0 77 Make only
(8) 75 F0 75 Make only
(5) 73 F0 73 Make only
(2) 72 F0 72 Make only
(0) 70 F0 70 Make only
(*) 7E F0 7E Make only
(9) 7D F0 7D Make only
(6) 74 F0 74 Make only
(3) 7A F0 7A Make only

EM83055H

* This specification are subject to be changed without notice.

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Key Make Code Break Code Default Key State

(DEL) 71 F0 71 Make only

(-) 84 F0 84 Make only

(+) 7C F0 7C Typematic

(ENTER) 79 F0 79 Make only

ESC 08 F0 08 Make only

F1 07 F0 07 Make only
F2 0F F0 0F Make only
F3 17 F0 17 Make only
F4 1F F0 1F Make only
F5 27 F0 27 Make only
F6 2F F0 2F Make only
F7 37 F0 37 Make only
F8 3F F0 3F Make only

F9 47 F0 47 Make only
F10 4F F0 4F Make only
F11 56 F0 56 Make only
F12 5E F0 5E Make only

PRINT 57 F0 57 Make only

SCROLL 5F F0 5F Make only

PAUSE 62 F0 62 Make only

Note .

@9 : 101-key keyboard only
@10 : 102-key keyboard only

EM83055H

KEYBOARD ENCODER

New key codes for scan set 1:

New key Make Break

LWIN E0 5B E0 DB
RWIN E0 5C E0 DC
APP E0 5D E0 DD
N-CHG (131) 7B FB
CHG (132) 79 F9
ROMA (133) 70 F0
K14 7D FD
K56 73 F3
K107 7E FE
KL F1 X
KR F0 X
POWER E0 5E E0 DE
SLEEP E0 5F E0 DF
WAKE UP E0 63 E0 E3

* This specification are subject to be changed without notice.

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New key codes for scan set 2:

New key Make Break

LWIN E0 1F E0 F0 1F
RWIN E0 27 E0 F0 27
APP E0 2F E0 F0 2F
N-CHG (131) 67 F0 67
CHG (132) 64 F0 64
ROMA (133) 13 F0 13
K14 6A F0 6A
K56 51 F0 51
K107 6D F0 6D
KL F1 X
KR F2 X
POWER E0 37 E0 F0 37
SLEEP E0 3F E0 F0 3F
WAKE UP E0 5E E0 F0 5E

New key codes for scan set 3:

EM83055H

KEYBOARD ENCODER

New key Make Break

LWIN 8B F0 8B MAKE/BREAK
RWIN 8C F0 8C MAKE/BREAK
APP 8D F0 8D MAKE/BREAK
N-CHG (131) 85 F0 85 MAKE
CHG (132) 86 F0 86 MAKE
ROMA (133) 87 F0 87 MAKE
K14 5D F0 5D TYPEMATIC
K56 51 F0 51 TYPEMATIC
K107 7B F0 7B TYPEMATIC
KL F1 X
KR F2 X
POWER X X
SLEEP X X
WAKE UP X X

Windows 2000 Multi-Media key Code.

K130 : WWW Back E06A E0EA E038 E0F038
K131 : WWWForward E069 E0E9 E030 E0F030
K132 : WWWstop E068 E0E8 E028 E0F028
K133 : WWWRefresh E067 E0E7 E020 E0F020
K134 : WWWSearch E065 E0E5 E010 E0F010
K135 : WWWFavorites E066 E0E6 E018 E0F018
K136 : WWWWeb/Home E032 E0B2 E03A E0F03A
K137 : Mail E06C E0EC E048 E0F048
K138 : Mute E020 E0A0 E023 E0F023
K139 : Volume- E02E E0AE E021 E0F021
K140 : Volume+ E030 E0B0 E032 E0F032
K141 : Play/Pause E022 E0A2 E034 E0F034
K142 : Stop E024 E0A4 E03B E0F03B
K143 : PreTrack E010 E090 E015 E0F015
K144 : Nexttrack E019 E099 E04D E0F04D
K145 : Media Select E06D E0ED E050 E0F050
K146 : MyComputer E06B E0EB E040 E0F040
K147 : Calculator E021 E0A1 E02B E0F02B

SET1 SET2
MAKE BREAK MAKE BREAK

* This specification are subject to be changed without notice.

9.25.2001

14

KEYBOARD ENCODER

Turbo Function:

Fn+ F1 2.1hz F6 30hz

F2 4.2hz F7 46hz
F3 7.2hz F11 keyLoak
F4 16.3hz
F5 21hz

Internal-Multikey Function 1:

Multi-Media Function Internal Function O.S. Function

Fn+ Pad_2 Volume- Pad_Enter Web/Home Pad_0 MyComputer

(M/Mode) Pad_3 Play/Pause Pad_+ Mail Pad_1 Calculator

Pad_4 PreTrack Pad_- Favorites
Pad_5 Media Pad_. Search
Pad_6 NextTrack Right Arrow Forward E Eur Key
Pad_7 Mute left Arrow Back
Pad_8 Volume+ Down Arrow Stop
Pad_9 Stop Up Arrow Refresh

EM83055H

Internal-Multikey Function 2:

Multi-Media Function Internal Function O.S. Function

Fn+ Pad_Enter Volume- F1 Web/Home F10 MyComputer

(M/Mode) Down Play/Pause F8 Mail F11 Calculator

Left PreTrack F2 Favorites

F9 Media F3 Search

Right NextTrack F6 Forward E Eur Key

F12 Mute F7 Back

Pad_+ Volume+ F5 Stop

Up Stop F4 Refresh

* This specification are subject to be changed without notice.

9.25.2001

15

K130 K131 K132 K133 K134 K135 K136 K137 K138 K139 K140 K141 K142 K143 K144 K145

EM83055H

KEYBOARD ENCODER

ESC

(~)

1234

‘

TAB Q W E R T Y

CAPS A S D F G H J

SHIFT_L Z X C V B N M

CTRL_L ALT_L

Fig 1. The Windows 2000 keyboard layout

ESC

(~)

‘

1234

TAB Q W E R T Y

CAPS A

SHIFT_L Z X

CTRL_L ALT_L

SDF GH J

CVBNM

LWIN

SPACE

HOME

END

UP

DOWN

SLEEP

SCROLL

HOMEINS

END

UP

DOWN

PAUSESCROLLPRINT

DOWN

WAKE UP

DOWN

](})

](})

SHIFT_R

ENTER

SHIFT_R

CTRL_R

ENTER

CTRL_R

SPACE

SPACE

F12F11F10

INS

)

\(

F12F11F10

)

\(

APP

DEL

LEFT

POWER

PRINT

DEL

LEFT

F8F7F6F5F4F3F2F1

9

8765

IU

F8F7F6F5F4F3F2F1

9

8765

IU

F9

(_)=(+)

-

10

[({)

P

O

’(")

;(:)

LK

/(?)

.(>),(<)

ALT_RSPACE

F9

(_)=(+)

-

10

[({)

P

O

’(")

;(:)

LK

/(?)

.(>),(<)

RWIN

ALT_R

PAGE

PAGE

RIGHT

PAUSE

PAGE

PAGE

RIGHT

UP

UP

K146 K147

(/)

NUM

(8)

(7)

(4)

(5)

(2)

(1)

(0)

NUM

(/)

(8)

(7)

(4)

(5)

(2)

(1)

(0)

(*)

(-)

(9)

(+)

(6)

(3)

(ENTER)

(*)

(*)

(-)

(9)

(+)

(6)

(3)

(ENTER)

(*)

Fig 2. The 107-key keyboard layout

ESC

(~)

1234

‘

TAB Q W E R T Y

CAPS A S D F G H J

SHIFT_L Z X C V B N M

LWIN

CTRL_L ALT_L

Fig 3. The 104-key keyboard layout

SCROLL

HOME

END

UP

DOWN

PAUSEPRINT

PAGE

DOWN

RIGHT

PAGE

(*)

NUM

UP

(/)

(8)

(7)

(4)

(5)

(2)

(1)

(0)

(-)

(9)

(+)

(6)

(3)

(ENTER)

(*)

](})

SHIFT_R

SPACE

ENTER

CTRL_R

F12F11F10

INS

)

\(

APP

DEL

LEFT

F8F7F6F5F4F3F2F1

9

8765

IU

F9

(_)=(+)

-

10

[({)

P

O

’(")

;(:)

LK

/(?)

.(>),(<)

RWIN

ALT_RSPACE

* This specification are subject to be changed without notice.

9.25.2001

16

ABSOLUTE MAXIMUM RATINGS

Parameter Sym. Ratings

EM83055H

KEYBOARD ENCODER

Supply Voltage V
Input Voltage V
Output Voltage V
Temperature under bias T
Storage temperature T

CC

IN

OUT

B

S

-0.5V to +7V

-0.3V to +6V

-0.3V to +6V

0°C to 70°C

-65°C to 150°C

DC ELECTRICAL CHARACTERISTICS

Parameter Sym. Min. Typ. Max. Unit Condition

Operating voltage V
Operating supply current I

Input leakage I
Input high voltage V

Input low voltage V
Output low voltage V
Output low voltage for LEDS V
Internal Pull-high resistance ( port 6,9 ) R

Internal Pull-high resistance for R
DATA, CLK

Output low voltage for DATA CLK V

CC

CCI

IN

IH

IL

OL1

OL2

PH1

PH2

OL3

4.5 5 5.5 V
3 mA Fosc=1.8432MHz

±1 µAVIN=VCC ,V

2.0 V

0.8 V

0.4 V I

3.2 V I

12 23 KΩ V

1.5 2.2 3 KΩ V

0.4 V I

= 3.0 mA

OL1

= 10 mA

OL2

= 0V

PH1

= 0V

PH2

= 5 mA

OL3

SS

AC ELECTRICAL CHARACTERISTICS

Parameter Sym. Min. Typ. Max. Unit

Time from DATA transition to falling edge of CLK T1 5 25 µS
Time from rising edge of CLK to DATA transition T2 5 T4 - 5 µS
Duration of CLK inactive T3 30 40 50 µS
Duration of CLK active T4 30 40 50 µS

Time to auxiliary device inhibit after clock 11 to ensure T5 50 µS
the auxiliary device does not start another transmission
Time from inactive to active CLK transition, used to time T6 5 25 µS
when auxiliary device samples DATA
System clock FCLK 1.843 MHz

* This specification are subject to be changed without notice.

9.25.2001

17

TIMING DIAGRAMS

EM83055H

KEYBOARD ENCODER

CLK

DATA

CLK

DATA

I/O

Inhibit

T1

Start Bit

Start Bit

1ST
CLK

T3

T2

2nd
CLK

T4

Bit 0

Fig 3. Keyboard output data timings

1ST
CLK

T3

Bit 0

2nd
CLK

T4

T6

Fig 4. Keyboard input data timings

10th
CLK

Parity Bit

9th
CLK

11th
CLK

T5

Parity Bit

Stop Bit

10th
CLK

11th
CLK

Stop Bit

* This specification are subject to be changed without notice.

9.25.2001

18

APPLICATION CIRCUIT

EM83055H

KEYBOARD ENCODER

VCC

Turbo func.

VCC

Internal­Multi Func. 2

Internal­Multi Func. 1

NUM

LED

SCROLL

LED

CAPS

LED

OSCO

GND

2

51K

R_OSCI

VDD

CAPS

1

393837

36
35
34
33
32
31
30
29
28
27

NUM
SCROLL
P67
P66
P65
P64
P63
P62
P61
P60

R7
R6
R5
R4
R3
R2
R1
R0

DATA

CLK

C1

P90

CLK

DATA

543

P91
P92
P93
P94
P95
P50
P51
P52
P53
P54

6
7
8

9
10
11

EM83055H

12
13
14
15

C2

R3

R

LED

C3
C4

C5
C6

C7

1617181920212223242526

P55

P56

P57

P80

P81

P82

P83

P84

P85

P86

P87

C14

C13

C12

C11

C15

C8

C10

C17

C16

C0

C9

* This specification are subject to be changed without notice.

9.25.2001

19

EM83055H

KEYBOARD ENCODER

C0

C1

C2

C3

C4

C5

C6

C7

C8

C9

C10

C11

C12

C13

C14

C15

C16

C17

R0

PAUSE

126

Q

017

W

018

E

019

R

020

U

023

I

024

O

025

P

026

SCROLL

125

K14

014

7

(K)

091

8

(K)

096

9

(K)

101

+

(K)

106

wake up

Mail

K150

(KC-L)

R1

POWER

TAB

016

CAP

030

F3

114

T

021

Y

022

](})

028

F7

118

[({)

027

BACK

015

4

(K)

092

5

(K)

097

6

(K)

102

K107

SHIFT-L

044

WIN-L

WWWFavorite

R2

A

031

S

032

D

033

F

034

J

037

K

038

L

039

;(:)

040

Fn M/Mode

\(|)

029

1

(K)

093

2

(K)

098

3

(K)

103

ENTER

(K)

108

SHIFT-R

057

WWWForward

WIN-R

R3

SLEEP

ESC

110

K45

045

F4

115

G

035

H

036

F6

117

’(")

041

ALT-L

060

F11

122

SPACE

061

0

(K)

099

¥

(K)

104

↑

083

Volume-

WWWstop

MyCpmputer

R4

CTRL-R

064

Z

046

X

047

C

048

V

049

M

052

,(<)

053

.(>)

054

K42

042

ENTER

043

NUM

090

/

(K)

095

*

(K)

100

Play/Pause

Volume+

WWWBack

Stop

R5

WAKE UP

N-CHG

131

CHG

132

ROMA

133

B

050

N

051

K56

056

APP

APP

/(?)

055

ALT-R

062

F12

123

↓

084

→

089

­105

←

079

NextTrack

WWWRefresh

Calculator

R6

CTRL-L

058

‘(~)

001

F1

112

F2

113

5(%)

006

6(^)

007

+‘(=)

013

F8

119

_(-)

012

F9

120

DEL

076

INS

075

PAGE UP

085

HOME

080

PrevTrack

Mute

Web/Home

R7

F5

116

1(!)

002

2(@)

003

3(#)

004

4($)

005

7(&)

008

8(*)

009

9(’)’)

010

0(’)’)

011

PRINT

124

F10

121

POWER

SLEEP

PAGE

DOWN

086

END

081

Media

WWWSearch

K151

(KC-R)

* This specification are subject to be changed without notice.

9.25.2001

20

PAD DIAGRAM

EM83055H

KEYBOARD ENCODER

GND

OSCI

391

22 23 24 25

P82

P83

P84

38

P85

VDD

P86

37

P70

P71

36

P72

35
34

P67

33

P66

32

P65

P64

31

P63

30
29

P62

28

P61

27

P60

26

P87

P90

P91
P92
P93
P94
P95
P50
P51

P52
P53
P54

DATAIO

CLKIO

34

5

6
7

8
9

10

11
12
13
14

15

16 17 18 19 20 21

P55

P56

OSCO

2

EM83055H

P57

P80

P81

(0,0)

Pad No. Symbol X Y

1 GND 197.9 720.4
2 OSCO -220.2 715.2
3 DATA -353.1 728.1
4 CLK -476.3 728.1
5 P90 -659.8 623.2
6 P91 -659.8 503.5
7 P92 -659.8 383.9
8 P93 -659.8 264.3

9 P94 -659.8 144.6
10 P95 -659.8 25.0
11 P50 -659.8 -94.7
12 P51 -659.8 -214.4
13 P52 -659.8 -334.1
14 P53 -659.8 -453.8
15 P54 -659.8 -577.9
16 P55 -521.0 -749.9
17 P56 -401.3 -749.9
18 P57 -281.6 -749.9
19 P80 -161.9 -749.9
20 P81 -42.3 -749.9
21 P82 77.3 -749.9
22 P83 197.0 -749.9
23 P84 316.7 -749.9
24 P85 436.4 -749.9
25 P86 556.1 -749.9

* This specification are subject to be changed without notice.

9.25.2001

21

Pad No. Symbol X Y

26 P87 675.8 -749.9
27 P60 660.0 -549.9
28 P61 660.0 -430.3
29 P62 660.0 -311.8
30 P63 660.0 -192.2
31 P64 660.0 -72.5
32 P65 660.0 47.2
33 P66 660.0 166.8
34 P67 660.0 290.8
35 P72 656.9 410.4
36 P71 656.9 528.9
37 P70 656.9 648.5
38 VDD 458.0 726.7
39 OSCI 316.3 715.2

Chip Size : 1650 x 1830 µm

EM83055H

KEYBOARD ENCODER

* This specification are subject to be changed without notice.

9.25.2001

22