RFHCS362F datasheet(14/54 Pages) MICROCHIP

14 / 54 page

rfHCS362G/362F

DS41189B-page 14

3.1.1

CODE HOPPING DATA

The hopping portion is calculated by encrypting the

counter, discrimination value and function code with the

Encoder Key (KEY). The counter is 16 bits wide. The

discrimination value is 10 bits wide. There are 2 coun-

ter overflow bits (OVR) that are cleared when the coun-

ter wraps to 0. The rest of the 32 bits are made up of

the function code also known as the button inputs.

3.1.2

FIXED CODE DATA

The 32 bits of fixed code consist of 28 bits of the serial

number (SER) and another copy of the function code.

This can be changed to contain the whole 32-bit serial

number with the Extended Serial Number (XSER) con-

figuration option.

3.1.3

MINIMUM CODE WORDS

MTX[0..1]

configuration bits selects the minimum

number of code words that will be transmitted. If the

button is released after 1.6 s (or greater) and MTX code

words have been transmitted, the code word being

transmitted will be terminated. The possible values are:

- 1

- 2

- 4

- 8

3.1.4

STATUS INFORMATION

The status bits will always contain the output of the Low

Voltage detector (VLOW), the Cyclic Redundancy

Check (CRC) bits (or TIME bits depending on CTSEL)

and the Button Queue information.

3.1.4.1

Low Voltage Detector Status (VLOW)

The output of the low voltage detector is transmitted

with each code word. If VDD drops below the selected

voltage, a logic ‘1’ will be transmitted. The output of the

detector is sampled before each code word is transmit-

ted.

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