HCS362-ISLASHST datasheet(19/38 Pages) MICROCHIP

Numer części	HCS362-I/ST

Szczegółowy opis	KEELOQ Code Hopping Encoder

PDF	38 Pages

Scroll/Zoom	100%

Producent	MICROCHIP [Microchip Technology]

Strona internetowa	http://www.microchip.com

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19 / 38 page

Preliminary

DS40189D-page 19

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

FIGURE 4-2:

CODE WORD ORGANIZATION (SYNCHRONOUS TRANSMISSION MODE)

“01,10,11”

DATA

S[1:0]

TPS

TPH1 TPH2

t = 50ms

Preamble

Header

Data

RFEN

TRFON

QUEUE

(2 bits)

CRC

(2 bits)

Vlow

(1-bit)

Button

Status

S2 S1 S0 S3

Serial Number

(28 bits)

Button

Status

S2 S1 S0 S3

DISC+ OVR

(12 bits)

Sync Counter

(16 bits)

69 Data bits

Transmitted

LSb first.

LSb

MSb

Fixed Portion

Encrypted Portion

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