1

* This specification are subject to be changed without notice.

EM83049

KEYBOARD ENCODER

5.2.1997

EM83049

KEYBOARD ENCODER

GENERAL DESCRIPTION

The EM83049 microcontroller is dedicated to a keyboard encoder ,specially designed for IBM PC AT,XT and

all compatible machines. The EM83049 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,XT and PS/2 keyboard .

• Low power CMOS device technology.

• Internal pull-up resistor.

• Tri-state outputs for easy board application.

• 40 Pin DIP package.

• Built-in 4K ROM.

• 101/102/104 keys or other special application keyboard encoder.

• WINDOWS is registered trademarks of Microsoft corperation.

APPLICATION

• IBM PC/AT,XT or compatible machine keyboard.

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

• Japanese keyboard.

• Korean keyboard.

PIN ASSIGNMENTS

VSS

NC

DATA

CLK

P90

P91

NC

NC

XT

NC

P50

P51

P52

P53

P54

P55

P56

P57

P80

P81

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

OSCO

OSCR

VDD

CAPS

NUM

SCROLL

P67

P66

P65

P64

P63

P62

P61

P60

P87

P86

P85

P84

P83

P82

EM83049