HCS365 datasheet(17/34 Pages) MICROCHIP

17 / 34 page

Preliminary

DS41109D-page 17

HCS365

FIGURE 5-2:

LED OPERATION

5.4

Cyclic Redundancy Check (CRC)

The CRC bits are calculated on the 65 previously trans-

mitted bits. These bits contain the 32-bit hopping code,

32-bit fixed code, and VLOW bit. The decoder can use

the CRC bits to check the data integrity before process-

ing starts. The CRC can detect all single bit errors and

66% of double bit errors. The CRC is computed as fol-

lows:

EQUATION 5-1:

CRC Calculation

and

with

and Di

n the nth transmission bit 0 <= n <= 64

5.5

Button Queue Information

(QUEUE)

The queuing or repeated pressing of the same buttons

can be handled in two ways on the HCS365. This is

controlled with the Queue Counter Enable (QUEN)

configuration option. This option can be different for

Encoder 1 and Encoder 2.

When the QUEN option is disabled, the device will reg-

ister up to two sequential button presses. In this case,

the device will complete the minimum code words

selected with the MTX option before the second code

word is calculated and transmitted. The code word will

be 67 bits in this case, with no additional queue bits

transmitted.

If the QUEN option is enabled, the queue bits are

added to the standard code word. The queue bits are a

2-bit counter that does not wrap. The counter value

starts at 00

2 and is incremented if a button is pushed

within 2 seconds from the start of the previous button

press. The current code word is terminated when a but-

ton is queued. This allows additional functionality for

double or triple button presses.

FIGURE 5-3:

CODE WORD COMPLETION

WITH QUEN SETTINGS

6.0

PROGRAMMING

SPECIFICATIONS

Refer to the “HCS365 Programming Specifications”

document (DS41157) in Microchip Literature.

LED

VDD > VLOW

VDD < VLOW

TLEDON

TLEDOFF

LEDBL=1

LED

VDD < VLOW

LEDBL=0

CRC 1

[]

CRC 0

[]

⊕

CRC 0

[]

CRC 0

[]

⊕

() CRC 1

[]

⊕

CRC 1 0

[]

QUEN = Disabled

QUEN = Enabled

DATA

WAKE-UP

CODE2

MTX = 01

2, WAKE > 002

CODE1

WAKE-UP

DATA

WAKE-UP

CODE1

WAKE-UP

CODE2 01

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