HCS412 datasheet(26/44 Pages) MICROCHIP

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HCS412

DS41099C-page 26

Preliminary

FIGURE 4-11: IFF CHALLENGE AND RESPONSE

4.3.7

CODE HOPPING REQUEST

The command tells the HCS412 to increment the syn-

chronization counter and build the 32-bit code hopping

portion of the code word.

• If RF Echo is disabled, the data will be transmitted

on the LC lines only (Figure 4-12).

• If RF Echo is enabled, the data will be transmitted

in a code word on the DATA line followed by the

data transmitted on the LC lines. The DATA line is

transmitted first for passive entry support

(Figure 4-13).

The data format will be the same as described in

Section 3.2.

TABLE 4-8:

REQUEST HOPPING CODE COMMANDS

FIGURE 4-12: CODE HOPPING REQUEST (RF ECHO DISABLED)

FIGURE 4-13: CODE HOPPING REQUEST (RF ECHO ENABLED)

32-bit

Command

TIT

ACK

TOTD

TPU

TATO

Start

2 LFTE

Start

2 LFTE

01b Preamble

Communication from reader to HCS412

Communication from HCS412 to reader

Activate

Field

ACK

Delay to

Command

Delay to

Data

32-bit Challenge

Delay before

Response

32-bit

Response

Challenge

Response

Start

1 LFTE

Command

Description

Expected data In

Response

11000

Request Hopping Code transmission

None

32-Bit Hopping Code

TOTH

32-Bit PPM

Command

Start

2 LFTE

TPU

Communication from reader to HCS412

Communication from HCS412 to reader

Response

TATO

ACK

Start

1 LFTE

01b Preamble

Activate

Field

ACK

Delay to

Command

Delay before

Response

32-bit Response

LF Communication from reader to HCS412

LF Communication from HCS412 to reader

DATA (RF)

Inductive (LF)

Field

ACK

Field

ACK

32-Bit PPM

Response

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