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HCS362-I

KEELOQ® Code Hopping Encoder

Microchip Technology 

HCS362

4.6 SYNCHRONOUS MODE

In Synchronous mode, the code word can be clocked

out on DATA using S2 as a clock. To enter Synchro-

nous mode, DATA and S0 must be taken HIGH and

then S2 is taken HIGH. After Synchronous mode is

entered, S0 must be taken LOW. The data is clocked

out on DATA on every rising edge of S2. Auto-shutoff

timer is not disabled in Synchronous mode. This can be

used to implement RF testing.

FIGURE 4-1:

SYNCHRONOUS TRANSMISSION MODE

TPS TPH1 TPH2

DATA

t = 50ms

Preamble

Header

Data

S2

S[1:0]

“01,10,11”

RFEN

TRFON

FIGURE 4-2:

CODE WORD ORGANIZATION (SYNCHRONOUS TRANSMISSION MODE)

Fixed Portion

Encrypted Portion

QUEUE CRC Vlow Button

(2 bits) (2 bits) (1-bit) Status

S2 S1 S0 S3

MSb

Serial Number

(28 bits)

Button

Status

S2 S1 S0 S3

DISC+ OVR Sync Counter

(12 bits)

(16 bits)

69 Data bits

LSb

Transmitted

LSb first.

© 2011 Microchip Technology Inc.

DS40189E-page 19

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