RFHCS362G datasheet(14/60 Pages) MICROCHIP

14 / 60 page

rfHCS362G/362F

DS41189A-page 14

Preliminary

3.1

Transmission Modulation Format

The rfHCS362 transmission is made up of several code

words. Each code word consists of a preamble, a

header and data (see 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) config-

uration option.

There are two different modulation formats available on

the rfHCS362 that can be set using the Modulation

Select (MOD) configuration option:

• Pulse Width Modulation (PWM)

• Manchester Encoding

Modulation formats are shown in Figure 3-3 and

Figure 3-4. Code word data formats are shown in

Figure 3-6.

FIGURE 3-2:

CODE WORD TRANSMISSION SEQUENCE

FIGURE 3-3:

PULSE WIDTH MODULATION TRANSMISSION FORMAT

FIGURE 3-4:

MANCHESTER TRANSMISSION FORMAT

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

START bit

STOP bit

Time

Portion

bit 0 bit 1 bit 2

LOGIC "0"

LOGIC "1"

TBP

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