HCS362 datasheet(9/46 Pages) MICROCHIP

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DS40189E-page 9

HCS362

3.1

Transmission Modulation Format

The HCS362 transmission is made up of several code

words. Each code word starts with a preamble and a

header, followed by the data (see Figure 3-1 and

Figure 3-2).

The code words are separated by a Guard Time that

can be set to 0 ms, 6.4 ms, 25.6 ms or 76.8 ms with the

Guard Time Select (GUARD[0..1]) configuration

option. All other timing specifications for the modulation

formats are based on a basic timing element (TE). This

Timing Element can be set to 100

μs, 200 μs, 400 μs

or 800

μs with the Baud Rate Select (BSEL[0..1])

configuration option. The Header Time can be set to

3TE or 10 TE with the Header Select (HEADER) Con-

figuration option.

There are two different modulation formats available on

the HCS362 that can be set according to the Modula-

tion Select (MOD) configuration option:

• Pulse Width Modulation (PWM)

• Manchester Encoding

The various formats are shown in Figure 3-3 and

Figure 3-4.

FIGURE 3-2:

CODE WORD TRANSMISSION SEQUENCE

FIGURE 3-3:

TRANSMISSION FORMAT (PWM)

FIGURE 3-4:

TRANSMISSION FORMAT (MANCHESTER)

Header

Encrypt

Fixed

Guard

1 CODE WORD

Preamble

Encrypt

Preamble

Header

LOGIC "1"

Guard

Time

31 TE

Encrypted

Portion

Fixed Code

Portion

LOGIC "0"

Preamble

3-10

Header

TBP

Guard

Preamble

Header

Encrypted

Fixed Code

1 2

START bit

STOP bit

Time

Portion

bit 0 bit 1 bit 2

LOGIC "0"

LOGIC "1"

TE TE

TBP

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