HCS473-SLROM datasheet(31/68 Pages) MICROCHIP

31 / 68 page

 2002 Microchip Technology Inc.

Preliminary

DS40035C-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 T

HOP 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 K

EELOQ 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 T

CMD after the code

hopping response.

FIGURE 3-17:

REQUEST HOPPING CODE SEQUENCE (RF RESPONSE EXAMPLE)

TSF

ACK

CMD

CRC

CMD

‘1102’2 bits

HOP

RESPONSE

Command

CRC

TFINH

THOP

RF Response (RFRSP=1)

Optional Next

Command

CMD

Command

TCMD

Inductive In

(LC Pins)

RF Response

(DATA Pin)

TCMD

LF must remain on if following

with consecutive command

or if waiting for LF response

Wake Sequence

Previous Command

Response

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