HT6034 datasheet(6/10 Pages) HOLTEK

6 / 10 page

312 Series of Decoders

December 13, 1999

Functional Description

Operation

The 312 series of decoders provide various com-

binations of address and data pins in different

packages. They are paired with 312series of

encoders. The decoders receive data transmit-

ted by the encoders and interpret the first N

bits of the code period as addresses and the last

12-N bits as data (where N is the address code

number). A signal on the DIN pin then acti-

vates the oscillator which in turn decodes the

incoming address and data. The decoders check

the received address twice continuously. If all

the received address codes match the contents

of the decoder¢s local address, the 12-N bits of

data are decoded to activate the output pins

and the VT pin is set high indicating a valid

transmission. That will last until the address

code is incorrect or no signal is received.

The output of the VT pin is high only when the

transmission is valid. Otherwise it is always low.

Output type

The data outputs follow the encoders during a

valid transmission and are then latched in

this state until the next valid transmission

occurs.

Flowchart

The oscillator is disabled in the standby state

and activated as long as a logic ²high² signal is

applied to the DIN pin. i.e., the DIN pin should

be kept ²low² if there is no signal input.

Ye s

Are

C ode i n ?

S t or e dat a

Ye s

S t andby m ode

D i s abl e V T &

i gnor e t h e r e s t o f

th i s w o r d

Ye s

Addr es s or

dat a er r o r ?

Lat c h / M om ent a r y

dat a t o o ut put &

ac t i v a t e V T

Addr es s bi t s

m a t c hed ?

Ma t c h

pr ev i ous l y s t o r e d

dat a ?

2 t i m e s

of c hec k i ng

c o m p l e t ed ?

Po w e r o n

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