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MCS3142 Dual KEELOQ® Encoder Wireless Remote Control Development Kit User’s Guide

DS40001746A-page 42

 2014 Microchip Technology Inc.

A delta of ‘1’ is typical under normal operation. To easily see this delta grow, press the

Transmit button on the fob multiple times while being out of range from the receiver.

Then come back towards the receiver and press again. The delta will now be greater

than ‘1’.

When the sync counter gets to its maximum value, the fob needs to be reprogrammed

in order to resume normal operation again.

Advanced KEELOQ

Please see the previous section regarding how the Sync Counter window works.

KEELOQ’S Advanced Sync window has identical operation compared to Classic

KEELOQ with the exception that Advanced has a larger, 32-bit sync counter.

Ultimate KEELOQ

The pie in the Ultimate KEELOQ graphic uses the time-stamps between the transmitter

and receiver to construct a delta.

FIGURE 8-10:

ULTIMATE KEELOQ TIME-STAMP WINDOW

In the absence of a transmission, the PC will continuously increment its clock every ¼

second. A transmission will update the Receiver Clock block with the receiver’s time.

The transmitter’s time is symbolized by the black line and should land directly

in-between the two blue lines. The blue lines represent the acceptable drift between the

receiver and transmitter’s clocks. If the receiver has determined that the transmitter is

out of sync, it will force a re-sync event. The Receiver +10 secs button can be used to

simulate this re-sync event. The Delta Timer block holds the time difference between

the receiver’s clock and transmitter’s clock.

The KEELOQ block indicates the battery voltage on the recently received transmitter.

8.6

CALCULATOR

The GUI can also be used as a graphical calculator.

Some of the blocks appear raised than the others, indicating an input. The mouse

pointer will also transform into a hand as the mouse hovers over a raised block. These

special blocks are inputs to the calculator and can be used to manipulate the graphic.

After applying the changes, the graphic will update itself from the new stimulus. Note

that the effects are not saved to the transmitter, receiver, or inside the learned devices

table. These changes do not persist between sessions.

Note: All inputs to the system are in hexadecimal format.

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