RFHCS362G datasheet(15/60 Pages) MICROCHIP

15 / 60 page

Preliminary

DS41189A-page 15

rfHCS362G/362F

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

counter overflow bits (OVR) that are cleared when the

counter 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.

3.1.4.2

Button Queue Information (QUEUE)

The queue bits indicate a button combination was

pressed again within 2 s after releasing the previous

activation. Queuing or repeated pressing of the same

buttons (or button combination) is detected by the

rfHCS362 button debouncing circuitry.

The Queue bits are added as the last two bits of the

standard code word. The queue bits are a 2-bit counter

that does not wrap. The counter value starts at ‘00b’

and is incremented if a button is pushed within 2 s of

the previous button press. The current code word is ter-

minated when the buttons are queued. This allows

additional functionality for repeated button presses.

The button inputs are sampled every 6.4 ms during this

2 s period.

- first activation

- second activation

- third activation

- from fourth activation on

3.1.4.3

Time BITS

The time bits (Figure 3-5) indicate the duration that the

inputs were activated:

- immediate

- after 0.8 s

- after 1.6 s

- after 2.4 s

The TIME bits are incremented every 0.8 s and will not

wrap once it reaches ‘11’.

Time information is alternative to the CRC bits availabil-

ity and is selected by the CTSEL configuration bit.

FIGURE 3-5:

TIME BITS OPERATION

TTD

Time

DATA

= One Code Word

Time bits = 00

Time bits set internally to 01

Time bits actually output

Time bits set internally to 10

Time bits actually output

0 s

0.8 s

1.6 s

2.4 s

S[3210]

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