* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

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

95, 98 keys.

· 101/104/107 keys or other special application keyboard encoder.
· WINDOWS is registered trademarks of Microsoft corperation.

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

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

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

PIN DESCRIPTIONS

Symbol

I/O

Function

P50

Column 3 Low output scan line, 3-state

P51

Column 4 Low output scan line, 3-state

P52

Column 5 Low output scan line, 3-state

P53

Column 6 Low output scan line, 3-state

P54

Column 7 Low output scan line, 3-state

P55

Column 14 Low output scan line, 3-state

P56

Column 13 Low output scan line, 3-state

P57

Column 12 Low output scan line, 3-state

P80

Column 11 Low output scan line, 3-state

P81

Column 15 Low output scan line, 3-state

P82

Column 10 Low output scan line, 3-state

P83

Column 8 Low output scan line, 3-state

P84

Column 9 Low output scan line, 3-state

P85

Column 0 Low output scan line, 3-state

P86

Column 16 Low output scan line, 3-state

P87

Column 17 Low output scan line, 3-state

P90

Column 1 Low output scan line, 3-state

P91

Column 2 Low output scan line, 3-state

VSS

Ground

SCROLL

Scroll Lock Indicator

NUM

NUM Lock Indicator

CAPS

Caps Lock Indicator

P60

Row 0 Input scan line, internal pull high ( 10K

)

P61

Row 1 Input scan line, internal pull high ( 10K

)

P62

Row 2 Input scan line, internal pull high ( 10K

)

P63

Row 3 Input scan line, internal pull high ( 10K

)

P64

Row 4 Input scan line, internal pull high ( 10K

)

P65

Row 5 Input scan line, internal pull high ( 10K

)

P66

Row 6 Input scan line, internal pull high ( 10K

)

P67

Row 7 Input scan line, internal pull high ( 10K

)

CLK

I/O

CLOCK line for IBM communication , internal pull high ( 2.2K

)

DATA

I/O

DATA line for IBM communication , internal pull high ( 2.2K

)

+5V Power Supply

OSCO

CLOCK output

OSCR

Connect 51K OHM resistor for 1.8432 MHz oscillation

"1" or Floating=AT, "0"=XT, internal pull high.

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

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 buffer-
overrun 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.

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.

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

- 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.

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.

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

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

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 )

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

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

- 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.

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.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

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

`(~)

,(<)

.(>)

/(?)

SHIFT_R

CTRL_L

-(-)

ALT_L

=(+)

SPACE

BACK SPACE

ALT_R

E0 38

E0 B8

TAB

CTRL_R

E0 1D

E0 9D

NUM

(7)

(4)

(1)

(8)

(5)

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

Key

Make code

Break code

Key

Make code

Break code

(2)

(

)

(*)

(9)

[({)

(6)

](})

(3)

\( )@1

(DEL)

CAPS

(-)

(+)

(ENTER)

E0 1C

E0 9C

ESC

;(:)

'(")

K42 @2

ENTER

F10

SHIFT_L

F11

K45 @2

F12

SCROLL

Key

Base Case,or Shift + Nun Lock

Shift Case @3

Num Lock

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

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.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

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

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.

scan code set 2

Key

Make code

Break code

Key

Make code

Break code

`(~)

F0 0E

F0 22

F0 16

F0 21

F0 1E

F0 2A

F0 26

F0 32

F0 25

F0 31

F0 2E

F0 3A

F0 36

,(<)

F0 41

F0 3D

.(>)

F0 49

F0 3E

/(?)

F0 4A

F0 46

SHIFT_R

F0 59

F0 45

CTRL_L

F0 14

-(-)

F0 4E

ALT_L

F0 11

=(+)

F0 55

SPACE

F0 29

BACK SPACE

F0 66

ALT_R

E0 11

E0 F0 11

TAB

F0 0D

CTRL_R

E0 14

E0 F0 14

F0 15

NUM

F0 77

F0 1D

(7)

F0 6C

F0 24

(4)

F0 6B

F0 2D

(1)

F0 69

F0 2C

(8)

F0 75

F0 35

(5)

F0 73

F0 3C

(2)

F0 72

F0 43

(0)

F0 70

F0 44

(*)

F0 7C

F0 4D

(9)

F0 7D

[({)

F0 54

(6)

F0 74

](})

F0 5B

(3)

F0 7A

\( )@5

F0 5D

(DEL)

F0 71

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

Key

Make code

Break code

Key

Make code

Break code

CAPS

F0 58

(-)

F0 7B

F0 1C

(+)

F0 79

F0 1B

(ENTER)

E0 5A

E0 F0 5A

F0 23

ESC

F0 76

F0 2B

F0 05

F0 34

F0 06

F0 33

F0 04

F0 3B

F0 0C

F0 42

F0 03

F0 4B

F0 0B

;(:)

F0 4C

F0 83

'(")

F0 52

F0 0A

K42 @6

F0 5D

F0 01

ENTER

F0 5A

F10

F0 09

SHIFFT_L

F0 12

F11

F0 78

K45 @6

F0 61

F12

F0 07

F0 1A

SCROLL

F0 7E

Key

Base Case,or

Shift Case @7

Num Lock

Shift + Nun Lock

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

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

E0 12 E0 7C

E0 7C / E0 F0 7C

84 / F0 84

/ E0 F0 7C E0 F0 12

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

Key

Make Code

Ctrl Key Pressed

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

Key

Make Code

Break Code

Default Key State

`(~)

F0 0E

Typematic

F0 16

Typematic

F0 1E

Typematic

F0 26

Typematic

F0 25

Typematic

F0 2E

Typematic

F0 36

Typematic

F0 3D

Typematic

F0 3E

Typematic

F0 46

Typematic

F0 45

Typematic

-(_)

F0 4E

Typematic

=(+)

F0 55

Typematic

BACK SPACE

F0 66

Typematic

TAB

F0 0D

Typematic

F0 15

Typematic

F0 1D

Typematic

F0 24

Typematic

F0 2D

Typematic

F0 2C

Typematic

F0 35

Typematic

F0 3C

Typematic

F0 43

Typematic

F0 44

Typematic

F0 4D

Typematic

[({)

F0 54

Typematic

](})

F0 5B

Typematic

\( ) @9

F0 5C

Typematic

CAPS

F0 14

Make/Break

F0 1C

Typematic

F0 1B

Typematic

F0 23

Typematic

F0 2B

Typematic

F0 34

Typematic

F0 33

Typematic

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

Key

Make Code

Break Code

Default Key State

F0 3B

Typematic

F0 42

Typematic

F0 4B

Typematic

;(:)

F0 4C

Typematic

'(")

F0 52

Typematic

K42 @10

F0 53

Typematic

ENTER

F0 5A

Typematic

SHIFT_L

F0 12

Make/Break

K45 @10

F0 13

Typematic

F0 1A

Typematic

F0 22

Typematic

F0 21

Typematic

F0 2A

Typematic

F0 32

Typematic

F0 31

Typematic

F0 3A

Typematic

,(<)

F0 41

Typematic

.(>)

F0 49

Typematic

/(?)

F0 4A

Typematic

SHIFT_R

F0 59

Make/Break

CTRL_L

F0 11

Make/Break

ALT_L

F0 19

Make/Break

SPACE

F0 29

Typematic

ALT_R

F0 39

Make only

CTRL_R

F0 58

Make only

INS

F0 67

Make only

DEL

F0 64

Typematic

LEFT

F0 61

Typematic

HOME

F0 6E

Make only

END

F0 65

Make only

F0 63

Typematic

DOWN

F0 60

Typematic

PAGE UP

F0 6F

Make only

PAGE DOWN

F0 6D

Make only

RIGHT

F0 6A

Typematic

NUM

F0 76

Make only

(7)

F0 6C

Make only

(4)

F0 6B

Make only

(1)

F0 69

Make only

(/)

F0 77

Make only

(8)

F0 75

Make only

(5)

F0 73

Make only

(2)

F0 72

Make only

(0)

F0 70

Make only

(*)

F0 7E

Make only

(9)

F0 7D

Make only

(6)

F0 74

Make only

(3)

F0 7A

Make only

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

New key codes for scan set 1:

New key

Make

Break

LWIN

RWIN

APP

N-CHG (131)

CHG (132)

ROMA (133)

K14

K56

K107

POWER

SLEEP

WAKE UP

(DEL)

F0 71

Make only

(-)

F0 84

Make only

(+)

F0 7C

Typematic

(ENTER)

F0 79

Make only

ESC

F0 08

Make only

F0 07

Make only

F0 0F

Make only

F0 17

Make only

F0 1F

Make only

F0 27

Make only

F0 2F

Make only

F0 37

Make only

F0 3F

Make only

F0 47

Make only

F10

F0 4F

Make only

F11

F0 56

Make only

F12

F0 5E

Make only

F0 57

Make only

SCROLL

F0 5F

Make only

PAUSE

F0 62

Make only

Key

Make Code

Break Code

Default Key State

Note .

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

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

New key codes for scan set 2:

New key

Make

Break

LWIN

RWIN

APP

N-CHG (131)

CHG (132)

ROMA (133)

K14

K56

K107

POWER

SLEEP

WAKE UP

New key codes for scan set 3:

New key

Make

Break

LWIN

MAKE/BREAK

RWIN

MAKE/BREAK

APP

MAKE/BREAK

N-CHG (131)

MAKE

CHG (132)

MAKE

ROMA (133)

MAKE

K14

TYPEMATIC

K56

TYPEMATIC

K107

TYPEMATIC

POWER

SLEEP

WAKE UP

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

(-)

(+)

(ENTER)

(*)

(9)

(6)

(3)

(*)

(/)

(8)

(5)

(2)

NUM

(7)

(4)

(1)

(0)

PAUSE

SCROLL

PAGE

DOWN

HOME

END

INS

DEL

RIGHT

DOWN

LEFT

F12

F11

F10

SPACE

ENTER

SHIFT_R

CTRL_R

](})

[({)

'(")

/(?)

ALT_R

SPACE

;(:)

.(>)

,(<)

ESC

(~)

(_)

(+)

TAB

CAPS

SHIFT_L

CTRL_L

ALT_L

\( )

(-)

(+)

(ENTER)

(*)

(9)

(6)

(3)

(*)

(8)

(5)

(2)

NUM

(7)

(4)

(1)

(0)

SLEEP

PAUSE

PAGE

DOWN

SCROLL

END

DEL

PAGE

HOME

INS

RIGHT

DOWN

LEFT

F12

F11

F10

SPACE

ENTER

SHIFT_R

CTRL_R

](})

APP

[({)

'(")

RWIN

/(?)

ALT_R

SPACE

;(:)

.(>)

,(<)

ESC

(~)

(_)

(+)

TAB

CAPS

LWIN

SHIFT_L

CTRL_L

ALT_L

\( )

(/)

WAKE UP

POWER

(-)

(+)

(ENTER)

(*)

(9)

(6)

(3)

(*)

(8)

(5)

(2)

NUM

(7)

(4)

(1)

(0)

SCROLL

PAGE

DOWN

HOME

END

INS

DEL

RIGHT

DOWN

LEFT

F12

F11

F10

SPACE

ENTER

CTRL_R

](})

[({)

'(")

/(?)

ALT_R

SPACE

;(:)

.(>)

,(<)

ESC

(~)

(_)

(+)

TAB

CAPS

SHIFT_L

CTRL_L

ALT_L

\( )

(/)

PAUSE

SHIFT_R

APP

RWIN

LWIN

Fig 2. The 107-key keyboard layout

Fig 3. The 104-key keyboard layout

Fig 1. The 101-key keyboard layout

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

ABSOLUTE MAXIMUM RATINGS

Parameter

Sym.

Ratings

Supply Voltage

-0.5V to +7V

Input Voltage

-0.3V to +6V

Output Voltage

OUT

-0.3V to +6V

Temperature under bias

C to 70

Storage temperature

-65

C to 150

DC ELECTRICAL CHARACTERISTICS

Parameter

Sym.

Min. Typ.

Max.

Unit

Condition

Operating voltage

4.5

5.5

Operating supply current

CCI

Fosc=1.8432MHz

Input leakage

Input high voltage

2.0

Input low voltage

0.8

Output high voltage

OH1

2.4

= - 6.0 mA

Output low voltage

OL1

0.4

= 3.0 mA

Output low voltage for LEDS

OL3

3.2

= 10 mA

Internal Pull-high resistance ( port 6,9 )

PH1

4.7

Internal Pull-high resistance for

PH2

1.5

2.2

DATA, CLK

AC ELECTRICAL CHARACTERISTICS

Parameter

Sym.

Min.

Typ.

Max.

Unit

Time from DATA transition to falling edge of CLK

Time from rising edge of CLK to DATA transition

T4 - 5

Duration of CLK inactive

Duration of CLK active

Time to auxiliary device inhibit after clock 11 to ensure

the auxiliary device does not start another transmission
Time from inactive to active CLK transition, used to time

when auxiliary device samples DATA
System clock

FCLK

1.843

MHz

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

APPLICATION CIRCUIT

SCROLL

LED

NUM

LED

CAPS

LED

VCC

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

PAUSE

SCROLL

K14

(K)

K107

SHIFT-L

(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

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

CLK

51K

* This specification are subject to be changed without notice.

EM83050H

KEYBOARD ENCODER

9.16.1999

Preliminary

PAD DIAGRAM

Pad No.

Symbol

GND

-171.6

824.6

OSCO

-384.7

849.2

DATA

-580.9

849.2

CLK

-742.5

817.2

P90

-742.5

621.0

P91

-723.7

467.2

P92

-723.7

347.2

P93

-723.7

223.0

P94

-723.7

103.0

P95

-723.7

-21.2

P50

-715.1

-143.1

P51

-715.1

-263.1

P52

-715.1

-386.8

P53

-715.1

-506.8

P54

-707.8

-825.1

P55

-587.8

-825.1

P56

-464.1

-825.1

P57

-344.1

-825.1

P80

-220.0

-833.7

P81

-100.0

-833.7

P82

24.0

-825.1

P83

144.0

-825.1

P84

267.8

-825.1

P85

387.8

-825.1

P86

511.5

-825.1

GND

CLK

P90

P91

P92

P93

P94

P95

P50

P51

P52

P53

P54

P55

P56

P57

P80

P81

P82

P83

P84

P85

P86

P87

P60

P61

P62

P63

P64

P65

P66

P67

SCROLL

NOM

CAPS

VDD

OSCI

OSCO

EM83050H

(0,0)

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