Timing Diagrams

Data Output

Keyboard Data Input

HT82K628A

Rev. 1.60

13

April 16, 2004

Key Number

and Function

Make/Break code

Default

56

Brazil BA0

51/F0 51

Typematic

131

Japanese J131

67/F0 67

Make

132

Japanese J132

64/F0 64

Make

133

Japanese J133

13/F0 13

Make

150

Korea KC-L

F1/

-

Make

151

Korea KC-R

F2/

-

Make

( 1 )

( 3 )

( 3 )

( 3 )

( 3 )

( 4 )

1 s t

C L K

2 n d

C L K

1 0 t h

C L K

1 1 t h

C L K

D A T A

S t a r t B i t

B i t 0

P a r i t y B i t

S t o p B i t

T 5

T 3

T 4

T 1

T 2

( 2 )

( 5 ) ( 7 )

C L K

( 6 )

T i m i n g P a r a m e t e r

t h e a u x i l i a r y d e v i c e d o e s n o t s t a r t a n o t h e r t r a n s m i s s i o n

T 1

D A T A t r a n s i t i o n t o t h e f a l l i n g e d g e o f C L K

T 2

R i s i n g e d g e o f C L K t o D A T A t r a n s i t i o n

T 3

D u r a t i o n o f C L K i n a c t i v e

T 4

D u r a t i o n o f C L K a c t i v e

T 5

T i m e t o a u x i l i a r y d e v i c e i n h i b i t a f t e r c l o c k 1 1 t o e n s u r e

M i n / M a x

5 / T 4 - 5 m s e c

5 / 2 5 m s e c

3 0 / 5 0 m s e c

> 0 / 5 0 m s e c

3 0 / 5 0 m s e c

( 1 )

( 3 )

( 4 )

I / O

I n h i b i t

2 n d

C L K

1 0 t h

C L K

1 1 t h

C L K

D A T A

S t a r t B i t

B i t 0

P a r i t y B i t

S t o p B i t

T 7

T 8

T 9

( 5 )

( 7 )

C L K

( 6 )

T i m i n g P a r a m e t e r

w h e n t h e a u x i l i a r y d e v i c e s a m p l e s D A T A

T 7

D u r a t i o n o f C L K i n a c t i v e

T 8

D u r a t i o n o f C L K a c t i v e

T 9

T i m e f r o m i n a c t i v e t o a c t i v e C L K t r a n s i t i o n , u s e d t o t i m e

M i n / M a x

1 s t

C L K

( 2 )

9 t h

C L K

( 8 )

( 5 )

3 0 / 5 0 m s e c

3 0 / 5 0 m s e c

5 / 2 5 m s e c