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MRF39RA Datasheet(PDF) 39 Page - Microchip Technology

Part # MRF39RA
Description  Low-Power, Integrated UHF Receiver
PDF  72 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MRF39RA Datasheet(HTML) 39 Page - Microchip Technology

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 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
be
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
X0
X15
CRC Po lyn om ial = X16 + X12 + X5 + 1
* * *
X 4
* * *
data in pu t



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