MCS3122 datasheet(12/26 Pages) MICROCHIP

部件名	MCS3122

功能描述	MCS3122 Advanced KEELOQ짰 Technology Encoder Data Sheet

PDF	26 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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12 / 26 page

MCS3122

DS40001762A-page 12

 2014 Microchip Technology Inc.

5.0

TRANSMITTER OPERATION

5.1

Data Modulation Format and Baud

Rate

A transmission is made up of several code words. Each

code word contains a preamble, header and data. A

code word is separated from another code word by

guard time.

All timing specifications for the modulation formats are

based on a basic Time Element, described as TE. See

Section 5.2 “Baud Rate”

for details on baud rate

calculation. This timing element can be set to a wide

range of values. The length of the preamble, header

and guard is fixed. The guard time is fixed to a typical

18.5 ms.

FIGURE 5-1:

PWM TRANSMISSION FORMAT

FIGURE 5-2:

MANCHESTER TRANSMISSION FORMAT

116

31 TE Preamble

10 TE

Header

Encrypted Portion

Fixed Code Portion

Guard

Time

TE TE TE

TBP

Logic ‘0’

Logic ‘1’

116

Preamble

Encrypted Portion

Fixed Code Portion

Guard

Time

TE TE

TBP

Logic ‘0’

Logic ‘1’

10 TE

Header

bit 1

bit 0

bit 2

Start bit

Stop bit

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