HCS410 datasheet(9/46 Pages) MICROCHIP

9 / 46 page

HCS410

DS40158F-page 9

2.2.2

TRANSMISSION DATA MODULE

The Data Modulation Format is selectable between

Pulse Width Modulation (PWM) format and Manchester

encoding. Both formats are preceded by a preamble

and synchronization header, followed by the 69-bits of

data. Manchester encoding has a leading and closing

‘1’ for each code word.

The same code word is continuously sent as long as

the input pins are kept high with a guard time separat-

ing the code words. All of the timing values are in mul-

tiples of a Basic Timing Element (TE), which can be

changed using the baud rate option bits.

FIGURE 2-10: TRANSMISSION FORMAT—MANCH = 0

FIGURE 2-11: TRANSMISSION FORMAT—MANCH = 1

LOGIC "1"

Code Word

Guard

Time

Preamble

Sync

Encrypted

TX Data

Fixed Code

BIT

LOGIC "0"

3 579

46 8 10

CODE WORD:

TOTAL TRANSMISSION:

Preamble Sync Encrypt

Fixed

Guard

1 CODE WORD

4 5

Preamble Sync

Encrypt

14 15 16

Data

Guard

Preamble

Sync

Encrypted

Fixed Code

LOGIC "0"

CODE WORD:

TOTAL TRANSMISSION:

Sync

Encrypt

Fixed

Guard

1 CODE WORD

Preamble

Sync

Encrypt

14 15 16

LOGIC "1"

Start bit

Stop bit

CODE WORD

Preamble

Time

Data

40158F.book Page 9 Wednesday, June 1, 2011 10:36 AM

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