MRF39RA datasheet(39/72 Pages) MICROCHIP

tên linh kiện	MRF39RA

Giải thích chi tiết về linh kiện	Low-Power, Integrated UHF Receiver

PDF	72 Pages

Scroll/Zoom	100%

nhà sản xuất	MICROCHIP [Microchip Technology]

Trang chủ	http://www.microchip.com

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39 / 72 page

 2015 Microchip Technology Inc.

DS40001778B-page 39

MRF39RA

4.5.6.4

CRC-Based

The CRC check is enabled by setting bit CrcOn in

RegPacketConfig1. It is used for checking the integrity

of the message. The checksum is calculated on the

received payload and compared with the two

checksum bytes received. The result of the comparison

is stored in bit CrcOk.

By default if the CRC check fails then the FIFO is

automatically cleared and no interrupt is generated.

This

filtering

function

can

disabled

via

CrcAutoClearOff bit and in this case, even if CRC fails,

the FIFO is not cleared and only PayloadReady

interrupt goes high. Note that in both cases, the two

CRC checksum bytes are stripped off by the packet

handler and only the payload is made available in the

FIFO.

The CRC is based on the CCITT polynomial, see

Figure 4-12. This implementation also detects errors

due to leading and trailing zeros.

FIGURE 4-12:

CRC IMPLEMENTATION

X 14

X 13

X 12

X11

X 5

X15

CRC Po lyn om ial = X16 + X12 + X5 + 1

* * *

X 4

* * *

data in pu t

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