HT82K28A(2000) データシートの表示（PDF） - Holtek Semiconductor

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HT82K28A
(Rev.:2000)

Win98 Keyboard Encoder

Holtek Semiconductor 

HT82K28A

Timing Diagrams

Data output

(1 ) (3 )

C LK

(3 )

(3 )

1st

2nd

C LK

C LK

T3 T4

(2 )

T1

T2

D ATA

S ta r t B it

B it 0

(3 )

(4 )

1 0 th

1 1 th

C LK

C LK

T 5 (5 ) (7 )

P a r ity B it

S to p B it

(6 )

T im in g P a r a m e te r

T 1 D A T A tr a n s itio n to th e fa llin g e d g e o f C L K

T 2 R is in g e d g e o f C L K to D A T A tr a n s itio n

T 3 D u r a tio n o f C L K in a c tiv e

T 4 D u r a tio n o f C L K a c tiv e

T 5 T im e to a u x ilia r y d e v ic e in h ib it a fte r c lo c k 1 1 to e n s u r e

th e a u x ilia r y d e v ic e d o e s n o t s ta r t a n o th e r tr a n s m is s io n

M in /M a x

5 /2 5 m s e c

5 /T 4 -5 m s e c

3 0 /5 0 m s e c

3 0 /5 0 m s e c

> 0 /5 0 m s e c

Keyboard data input

(1 )

I/O (2 ) (4 ) 1 s t

2nd

In h ib it

C LK

C LK

C LK

D ATA

S ta r t B it

(3 )

T7 T8

T9

B it 0

(5 )

9 th

1 0 th

1 1 th

C LK

C LK

C LK

(8 )

(6 )

P a r ity B it S to p B it

(5 )

(7 )

T im in g P a r a m e te r

T 7 D u r a tio n o f C L K in a c tiv e

T 8 D u r a tio n o f C L K a c tiv e

T 9 T im e fr o m in a c tiv e to a c tiv e C L K tr a n s itio n , u s e d to tim e

w h e n th e a u x ilia r y d e v ic e s a m p le s D A T A

M in /M a x

3 0 /5 0 m s e c

3 0 /5 0 m s e c

5 /2 5 m s e c

16

February 16, 2000

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