MCS3142-ISLASHST datasheet(22/37 Pages) MICROCHIP

22 / 37 page

MCS3142

DS40001747A-page 22

 2014 Microchip Technology Inc.

6.2

Baud Rate

The baud rate of an encoder’s transmission is highly

configurable using two configuration options:

• The Time Element Clock Prescaler

• The Time Element Clock Value

Each encoder has its own independent configuration

and can therefore operate at a rate independent of the

other encoder. See Table 3-6 and Table 3-9 for the

Classic KEELOQ encoder and Table 3-14 and Table 3-17

for the Ultimate KEELOQ encoder.

The Time Element is calculated using the formula in

Equation 6-1.

EQUATION 6-1:

Table 3-17 lists appropriate settings for some baud

rates common to KEELOQ systems.

6.3

Transmission Modulation Format

The RF transmission can be configured to modulate

using Frequency-Shift Keying (FSK) or On-Off Keying

(OOK).

Each

encoder

may

configured

independently. See Table 3-7 and Table 3-15 for the

Classic KEELOQ and Ultimate KEELOQ encoders,

respectively.

TABLE 6-1:

CONFIGURATION FOR

COMMON BAUD RATES

TE (µs)

PRE

TIME

100

1:1

200

1:4

100

400

1:4

200

800

1:16

100

PRE TIME

810



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

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