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HCS473 データシート(PDF) 29 Page - Microchip Technology

部品番号 HCS473
部品情報  KEELOQ짰 3-Axis Transcoder
PDF  68 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS473 データシート(HTML) 29 Page - Microchip Technology

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 2000-2013 Microchip Technology Inc.
Preliminary
DS40035D-page 29
HCS473
3.2.3.6
REQUEST HOPPING CODE
COMMAND
The REQUEST HOPPING CODE command tells the
HCS473 to increment the synchronization counter and
build the 32-bit code hopping portion of the encoder
code word.
A delay of THOP occurs while the HCS473 increments
the counter (updating EEPROM values) and encrypts
the response.
RFRSP determines if the response will be transmitted
on the DATA pin. If enabled, the response will be a sin-
gle KEELOQ code hopping code word, based on
Encoder mode options. The code word will contain a
button code of ‘00002’, indicating the transmission did
not result from a button press.
LFRSP determines if the response will be transmitted
on the LC pins. The LC pin response will be the 32-bit
hopping portion of the code word, modulated PPM for-
mat.
If both RFRSP and LFRSP are enabled, the HCS473
will send the response on the DATA pin immediately fol-
lowed by the PPM response on the LC pins. Refer to
Section 3.2.1.7 for further response path details.
The next command must begin TCMD after the code
hopping response.
FIGURE 3-17:
REQUEST HOPPING CODE SEQUENCE (RF RESPONSE EXAMPLE)
TSF
ACK
CMD
CRC
TCMD
‘1102’2 bits
THOP
RESPONSE
Command
CRC
TFINH
THOP
RF Response (RFRSP=1)
Optional Next
Command
TCMD
Next
Command
TCMD
TCMD
Inductive In
(LC Pins)
RF Response
(DATA Pin)
TCMD
TCMD
LF must remain on if following
with consecutive command
or if waiting for LF response
Wake Sequence
or
Previous Command
Response



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