HT614(2000) 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT614 Datasheet PDF : 9 Pages
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HT604L/614/692
Functional Description
Operation
The 318 series of decoders provide various com-
binations of address and data pins in different
packages. It is paired with the 318 series of
encoders. The decoders receive data transmit-
ted by the encoders and interpret the first N
bits of the code period as address and the last
18-N bits as data (where N is the address code
number). A signal on the DIN pin then acti-
vates the oscillator which in turns decodes the
incoming address and data. The decoders will
check the received address twice continuously.
If all the received address codes match the con-
tents of the decoder¢s local address, the 18-N
bits of data are decoded to activate the output
pins, and the VT pin is set high to indicate a
valid transmission. That will last until the ad-
dress code is incorrect or no signal has been re-
ceived. The output of the VT pin is high only
when the transmission is valid. Otherwise it is
always low.
Output type
There are two types of output to select from:
· Momentary type
The data outputs follow the encoder during a
valid transmission and then reset.
· Latch type
The data outputs follow the encoder during a
valid transmission, and are then latched in
this state until the next valid transmission
occurs.
Flowchart
P ow eron
S ta n d b y m o d e
No
C o d e in ?
Y es
D is a b le V T &
ig n o r e th e r e s t o f
th is w o r d
A d d r e s s b its
No
m a tc h e d ?
Y es
S to re d a ta
M a tc h
p r e v io u s s to r e d
No
d a ta ?
Y es
No
2 tim e s
o f c h e c k in g
c o m p le te d ?
Y es
L a tc h /M o m e n ta ry
d a ta to o u tp u t &
a c tiv a te V T
No
A d d re s s o r
d a ta e rro r ?
Y es
Note: 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 should be kept
²low² if there is no signal input.
5
April 24, 2000
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