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NT6868A

Keyboard Controller

Features

n

n

n

n

n

Built-in 6502 8-bit CPU

2 MHz CPU operation frequency

4K bytes of ROM

128 bytes of SRAM

One 8-bit programmable base timer with

1 - 256

碌sec

interval

n

29 programmable bi-directional I/O pins

n

3 LED direct sink pins with internal serial resistors

n

Mask optional for built-in RC oscillator with an

external resistor or external ceramic resonator applied

n

Watch-dog timer

n

Built-in power-on reset

n

Built-in low voltage reset

n

CMOS technology for low power consumption

n

Available in 40 pin DIP package and 40 pad CHIP

FORM

General Description

NT6868A is a single chip micro-controller for keyboard

applications. It incorporates a 6502 8-bit CPU core, 4K

bytes of ROM, and 128 bytes of RAM used as working

RAM and stack area. It also includes 29 programmable

bi-directional I/O pins and one 8-bit pre-loadable base

timer. Additionally, it includes a built-in low voltage

reset, a 4MHz RC oscillator that requires only a resistor

externally applied or a 4MHz ceramic resonator, and a

watch-dog timer that prevents system standstill.

Pin Configuration

GND

NC

DATA

CLK

P30

P31

P32

P33

P34

RESET

P00

P01

P02

P03

P04

P05

P06

P07

P10

P11

1

2

3

4

5

6

7

8

40

39

38

37

36

35

34

33

OSCI

R/OSCO

V

DD

LED2

LED1

LED0

P27

P26

P25

P24

P23

P22

P21

P20

P17

P16

P15

P14

P13

P12

Pad Configuration

P

1

7

P

1

6

P

1

5

P

1

4

P

1

3

P

1

2

P

1

1

P

1

0

P

0

7

P

0

6

26

25

24

23

22

21

20

19

18

17

16

15

P05

P04

P03

P02

P01

P00

RESET

P34

P33

P32

P20

P21

P22

P23

P24

P25

P26

P27

LED0

LED1

27

28

29

30

31

32

33

34

35

36

37

38

39

40

1

2

3

4

5

14

13

12

11

10

9

8

7

NT6868A

9

10

11

12

13

14

15

16

17

18

19

20

32

31

30

29

28

27

26

25

24

23

22

21

NT6868AH

6

P31

L

E

D

2

V

D

D

R

/

O

S

C

O

O

S

C

I

G

N

D

N

C

D

A

T

A

C

L

K

P

3

0

1

V2.1

next

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