MCS3122 datasheet(9/26 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS40001762A-page 9

MCS3122

4.0

ADVANCED KEELOQ®

TECHNOLOGY OPERATION

4.1

Synchronization Counter

This is the 24-bit synchronization value that is used to

create the hopping code for transmission. This value

will be incremented after every transmission. The initial

value of the synchronization counter may be set via the

Synchronization Counter Initial Value registers (see

Table 3-2 and Table 3-3).

4.2

Function Code (Button Status

Code)

The function code is a bitmapped representation of the

state of each button on the transmitter. States are

active-high.

4.3

Serial Number

Each Advanced KEELOQ encoder transmits its 32-bit

serial number with each transmission. It is intended

that this serial number be unique to a system. It is set

in the Serial Number Configuration registers, listed in

Table 3-7.

4.4

Seed Code Serial Number

The transmitter has the possibility to set the serial

number which will be transmitted with a seed

transmission. In a typical system, this serial number is

transmitted as 0xFFFFFFFF; however, the user can

configure this according to the actual application. The

seed code serial number is set in the Seed Code

Configuration registers, listed in Table 3-4.

TABLE 4-1:

ADVANCED KEELOQ®

BUTTON CODE

TRANSLATION

Button

Function Code

SW0

xx1

SW1

x1x

SW2

1xx

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