HCS370ST datasheet(15/36 Pages) MICROCHIP

15 / 36 page

2002 Microchip Technology Inc.

Preliminary

DS41111D-page 15

HCS370

FIGURE 4-3:

VARIABLE PULSE WIDTH MODULATION (VPWM)

FIGURE 4-4:

PULSE POSITION MODULATION (PPM)

In addition to the Modulation Format, Guard Time, and

Baud Rate, the following options are also available to

change the transmission format:

• If the START/STOP Pulse Enable (STEN) config-

uration option is enabled, the HCS370 will place a

leading and trailing ‘1’ on each code word. This is

necessary for modulation formats such as

Manchester and PPM to interpret the first and last

data bit.

• A wake-up sequence can be transmitted before

the transmission starts. The wake-up sequence is

configured with the Wake-up (WAKE) configura-

tion option and can be disabled or set to 50 ms,

75 ms, or 100 ms of pulses as indicated in

Figure 4-5.

• The WAKE option is the same for both Encoder 1

and Encoder 2.

FIGURE 4-5:

WAKE-UP ENABLE

VPWM BIT ENCODING:

TBP

on Transition Low to High

TBP

LOGIC “0”

TBP

LOGIC “1”

on Transition High to Low

2XTE

TBP

Guard

Time

10xTE Header

Encrypted Portion

Fixed Code Portion

2XTE

31xTE 50% Preamble

216

LOGIC “0”

LOGIC “1”

LOGIC "1"

LOGIC "0"

TE TE TE

Guard

Time

Fixed Code Portion

Encrypted Portion

TBP

31xTE 50% Preamble

START bit

STOP bit

10xTE Header

216

3 X TE

WAKE-UP = 75 ms

WAKE-UP = 50 ms

WAKE-UP = 100 ms

WAKE-UP

Guard Time = 6.4 ms, 51.2 ms, or 102.4 ms

CODE

TE TE

2TE

5TE

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