HT6P20 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
Manufacturer
HT6P20 Datasheet PDF : 9 Pages
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HT6P20
Normal operation
The HT6P20 encodes and transmits address/data to a decoder upon receipt of a trigger signal. The
address codes of the HT6P20A are always transmitted as long as power (VDD) is supplied. The trans-
mission function of the HT6P20B/D is enabled by the D0~D7 pins (active low). The following is the
transmission timing of the HT6P20:
D0 ~ D7
E ncoder
DOUT
< 1 w o rd
> 1 w o rd
Transmission timing
A complete code word of the HT6P20D consists of 3 periods as shown below.
fo s c
DOUT
1 c lo c k
p ilo t p e r io d
( 2 3 c lo c k s )
1 /3 b it
( A 0 ~ A 1 9 , 6 0 c lo c k s )
a d d r e s s c o d e p e r io d
( D 3 ~ D 0 , 1 2 c lo c k s )
d a ta c o d e p e r io d
A complete code word for the HT6P20D
0
1
0
1
a n ti- c o d e p e r io d
( 4 b its )
The HT6P20A/B/D detects the logic state of the internal programmed address and the external data
pins, and then transmits the detected information during the code period. Each address/data bit can be
set to one of the following two logic states:
fo s c
"O ne"
"Z e ro "
A d d re s s /
D a ta b it
6
May 2, 2000
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