HCS370P datasheet(14/36 Pages) MICROCHIP

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HCS370

DS41111D-page 14

Preliminary

2002 Microchip Technology Inc.

4.0

TRANSMITTED WORD

4.1

Transmission Modulation Format

The HCS370 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. The Guard Time Select (GSEL)

configuration option can be set to 0 ms, 6.4 ms, 51.2

ms, or 102.4 ms.

All other timing specifications for the modulation for-

mats 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) configuration

option. The Header time can be set to 4TE or 10TE with

the Header Select (HSEL) configuration option. These

options can all be set individually for Encoder 1 and

Encoder 2.

There are four different modulation formats available,

the Modulation Select (MSEL) Configuration Option is

used to select between:

• Pulse Width Modulation (PWM)

• Manchester (MAN)

• Variable Pulse Width Modulation (VPWM)

• Pulse Position Modulation (PPM)

FIGURE 4-1:

PULSE WIDTH MODULATION (PWM)

FIGURE 4-2:

MANCHESTER (MAN)

LOGIC "1"

Guard

Time

Encrypted Portion

Fixed Code Portion

LOGIC "0"

4-10

Header

xTE

TBP

31xTE 50% Preamble

Guard

Header

Encrypted Portion

Fixed Code Portion

START bit

STOP bit

Time

bit 0 bit 1 bit 2

LOGIC "0"

LOGIC "1"

TBP

31xTE 50% Preamble

216

4xTE

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