Datasheet EM83050H Datasheet (ELAN)

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GENERAL DESCRIPTION

The EM83050H microcontroller is dedicated to a keyboard encoder ,specially designed for IBM PC XT/AT and all compatible machines. The EM83050H 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 XT/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

• 101/104/107 keys or other special application keyboard encoder.

• WINDOWS is registered trademarks of Microsoft corperation.

95, 98 keys.

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EM83050H

KEYBOARD ENCODER

APPLICATION

• IBM PC XT/AT or compatible machine keyboard.

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

• Japanese keyboard.

• Korean keyboard.

• Brazil keyboard.

PIN ASSIGNMENTS

P91 P92 P93 P94 P95 P50 P51 P52 P53 P54

P90

CLK

DATA

OSCO

GND

543

6 7 8 9

EM83050H

11 12 13 14 15

1617181920212223242526

OSCI

403938

VDD

CAPS

NUM

SCROLL

P67

34 33

P66

P65

P64

P63

P62

P61

P60

P55

P56

P57

P80

P81

* This specification are subject to be changed without notice.

P82

P83

P84

P85

P86

P87

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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 ( 10KΩ ) P61 I Row 1 Input scan line, internal pull high ( 10KΩ ) P62 I Row 2 Input scan line, internal pull high ( 10KΩ ) P63 I Row 3 Input scan line, internal pull high ( 10KΩ ) P64 I Row 4 Input scan line, internal pull high ( 10KΩ ) P65 I Row 5 Input scan line, internal pull high ( 10KΩ ) P66 I Row 6 Input scan line, internal pull high ( 10KΩ ) P67 I Row 7 Input scan line, internal pull high ( 10KΩ ) 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

OSCO O CLOCK output OSCR I Connect 51K OHM resistor for 1.8432 MHz oscillation XT I "1" or Floating=AT, "0"=XT, internal pull high.

I +5V Power Supply

EM83050H

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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.

EM83050H

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.

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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

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

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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

EM83050H

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.

EM83050H

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.

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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

W 11 91 (7) 47 C7

E 1292 (4)4BCB R 13 93 (1) 4F CF T 14 94 (8) 48 C8 Y 15 95 (5) 4C CC

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Key Make code Break code Key Make code Break code

U 16 96 (2) 50 D0

I1797 (θ)52D2

O 18 98 (*) 37 B7

P 19 99 (9) 49 C9 [({) 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

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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.

EM83050H

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

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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

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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

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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

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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

EM83050H

Note .

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

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

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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

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New key codes for scan set 3:

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

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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 101-key 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

Fig 2. The 107-key keyboard layout

HOME

END

DOWN

SLEEP

SCROLL

HOMEINS

END

DOWN

PAUSESCROLLPRINT

PAGE

DOWN

RIGHT

WAKE UP

PAUSE

PAGE

DOWN

RIGHT

NUM

(8)

(7)

(4)

(5)

(2)

(1)

(0)

NUM

(/)

(8)

(7)

(4)

(5)

(2)

(1)

(0)

(-)

(9)

(+)

(6)

(3)

(ENTER)

(*)

(-)

(9)

(+)

(6)

(3)

(ENTER)

(*)

(/)

](})

SHIFT_R

ENTER

SHIFT_R

CTRL_R

ENTER

CTRL_R

SPACE

F12F11F10

INS

)

F12F11F10

APP

DEL

LEFT

POWER

)

DEL

LEFT

F8F7F6F5F4F3F2F1

8765

F8F7F6F5F4F3F2F1

8765

(_)=(+)

[({)

'(")

;(:)

/(?)

.(>),(<)

ALT_RSPACE

(_)=(+)

[({)

'(")

;(:)

/(?)

.(>),(<)

RWIN

ALT_R

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

DOWN

HOME

END

PAUSEPRINT

DOWN

PAGE

RIGHT

NUM

(7)

(4)

(1)

(0)

(*)

(/)

(8)

(5)

(2)

(-)

(9)

(+)

(6)

(3)

(ENTER)

(*)

](})

SHIFT_R

SPACE

ENTER

CTRL_R

F12F11F10

INS

)

APP

DEL

LEFT

F8F7F6F5F4F3F2F1

8765

(_)=(+)

[({)

'(")

;(:)

/(?)

.(>),(<)

RWIN

ALT_RSPACE

* This specification are subject to be changed without notice.

9.16.1999

Page 16

PreliminaryPreliminary

Preliminary

PreliminaryPreliminary

ABSOLUTE MAXIMUM RATINGS

Parameter Sym. Ratings

EM83050H

KEYBOARD ENCODER

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

OUT

-0.5V to +7V

-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 high 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

CCI

OH1

OL1

OL3

PH1

PH2

4.5 5 5.5 V 3 mA Fosc=1.8432MHz

±1 µAV

2.0 V

0.8 V

2.4 V I

0.4 V IOL = 3.0 mA

3.2 V IOL = 10 mA

4.7 10 KΩ

1.5 2.2 3 KΩ

IN=VCC

= - 6.0 mA

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.

9.16.1999

Page 17

TIMING DIAGRAMS

PreliminaryPreliminary

Preliminary

PreliminaryPreliminary

EM83050H

KEYBOARD ENCODER

CLK

DATA

CLK

DATA

I/O

Inhibit

Start Bit

1ST CLK

2nd CLK

Bit 0

Fig 3. Keyboard output data timings

1ST CLK

Bit 0

2nd CLK

Fig 4. Keyboard input data timings

10th CLK

Parity Bit

9th CLK

11th CLK

Parity Bit

Stop Bit

10th CLK

11th CLK

Stop Bit

* This specification are subject to be changed without notice.

9.16.1999

Page 18

APPLICATION CIRCUIT

SCROLL

LED

NUM

LED

CAPS

LED

R4R3R2R1R0

VCC

10µ

C10

C11

C12

C13

C14

C15

C16

C17

126

017

018

019

020

023

024

025

026

125

014

091

096

101

106

(KC-L)

016

030

114

021

022

028

118

027

015

092

097

102

044

WIN-L

031

032

033

034

037

038

039

040

029

093

098

103

108

057

WIN-R

110

045

115

035

036

117

041

060

122

061

099

104

083

064

046

047

048

049

052

053

054

042

043

090

095

100

131

132

133

050

051

056

APP

055

062

123

084

089

105

079

058

001

112

113

006

007

013

119

012

120

076

075

085

080

116

002

003

004

005

008

009

010

011

124

121

086

081

R0 R1 R2 R3 R4 R5 R6 R7

PAUSE

SCROLL

K14

(K) (K)

(K)

(K)5(K)6(K)

K107

SHIFT-L

(K)+(K)

WAKE UP

K150

POWER

TAB

CAP

](})

[({)

BACK

;(:)

\(|)

ENTER

SHIFT-R

SLEEP

ESC

K45

'(")

ALT-L

F11

SPACE

•

↑

CTRL-R

,(<)

.(>)

K42

ENTER

NUM

KC-L

WAKE UP

N-CHG

CHG

ROMA

K56

APP

/(?)

ALT-R

F12

↓

→

←

CTRL-L

`(~)

5(%)

6(^)

+`(=)

_(-)

DEL

INS

PAGE UP

HOME

KC-R

1(!)

2(@)

3(#)

4($)

7(&)

8(*)

9(')')

0(')')

F10

POWER

SLEEP

PAGE

END

K151

DOWN

(KC-R)

P91

P92

P93

P94

P95

P50

P51

P52

P53

P54

678

1011121314

363534333231302928

OSCI

VDD

CAPS

P55

P56

P57

P80

P81

P82

P83

P84

P85

P86

P87

NUM

SCROLL

P67

P66

P65

P64

P63

P62

P61

P60

EM83050H

P90

CLK

DATA

OSCO

GND

DATA

C14

C13

C12

C11

C15

C16

C17

C10

R7R6R5

CLK

51K

EM83050H

KEYBOARD ENCODER

PreliminaryPreliminary

Preliminary

PreliminaryPreliminary

* This specification are subject to be changed without notice.

9.16.1999

Page 19

PAD DIAGRAM

PreliminaryPreliminary

Preliminary

PreliminaryPreliminary

EM83050H

KEYBOARD ENCODER

GND

OSCO

EM83050H

P57

P80

20 21

P81

(0,0)

22 23 24 25

P82

P83

OSCI

P84

3940

VDD

P85

VDD

P86

CAPS

NOM

SCROLL

P67

P66

P65

P64

P63

P62

P61

P60

P87

CLK

P90

P91 P92 P93

P94 P95

P50 P51 P52 P53

DATA

6 7

8 9

11 12 13

P54

17 18

P55

P56

Pad No. Symbol X Y

1 GND -171.6 824.6 2 OSCO -384.7 849.2 3 DATA -580.9 849.2 4 CLK -742.5 817.2 5 P90 -742.5 621.0 6 P91 -723.7 467.2 7 P92 -723.7 347.2 8 P93 -723.7 223.0

9 P94 -723.7 103.0 10 P95 -723.7 -21.2 11 P50 -715.1 -143.1 12 P51 -715.1 -263.1 13 P52 -715.1 -386.8 14 P53 -715.1 -506.8 15 P54 -707.8 -825.1 16 P55 -587.8 -825.1 17 P56 -464.1 -825.1 18 P57 -344.1 -825.1 19 P80 -220.0 -833.7 20 P81 -100.0 -833.7 21 P82 24.0 -825.1 22 P83 144.0 -825.1 23 P84 267.8 -825.1 24 P85 387.8 -825.1 25 P86 511.5 -825.1

* This specification are subject to be changed without notice.

9.16.1999

Page 20

PreliminaryPreliminary

Preliminary

PreliminaryPreliminary

Pad No. Symbol X Y

26 P87 633.4 -825.1 27 P60 754.8 -825.1 28 P61 741.7 -636.9 29 P62 741.7 -470.1 30 P63 741.7 -301.3 31 P64 741.7 -134.6 32 P65 741.7 34.2 33 P66 741.7 201.0 34 P67 741.7 369.8 35 P72 741.7 536.5 36 P71 741.7 705.3 37 P70 706.8 854.2 38 VDD 504.5 824.6 39 VDD 384.5 824.6 40 OSCI 264.5 832.2

Chip Size : 1790 x 2010 µm

EM83050H

KEYBOARD ENCODER

* This specification are subject to be changed without notice.

9.16.1999