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CLRC663 Datasheet(PDF) 88 Page - NXP Semiconductors

Part No. CLRC663
Description  Contactless reader IC
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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CLRC663 Datasheet(HTML) 88 Page - NXP Semiconductors

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CLRC663
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 3 April 2012
171133
88 of 132
NXP Semiconductors
CLRC663
Contactless reader IC
9.10 Transmitter configuration registers
9.10.1 TxDataNum
3 to 2
RxCRCtype
Defines which type of CRC (CRC8/CRC16/CRC5) is calculated:
00h -- CRC5
01h -- CRC8
02h -- CRC16
03h -- RFU
1
RxCrcInvert
If set, the CRC check is done for the inverted CRC.
0
RxCrcEn
If set, the CRC is checked and in case of a wrong CRC an error flag is
set. Otherwise the CRC is calculated but the error flag is not modified.
Table 140. Receiver CRC preset value configuration
RXPresetVal[6...4]
CRC16
CRC8
CRC5
0h
0000h
00h
00h
1h
6363h
12h
12h
2h
A671h
BFh
-
3h
FFFEh
FDh
-
4h
---
5h
---
6h
User defined
User defined
User defined
7h
FFFFh
FFh
1Fh
Table 139. RxCrcCon bits
Bit
Symbol
Description
Table 141. TxDataNum register (address 2Eh)
Bit
7
6
5
4
3
2
1
0
Symbol
RFU
RFU-
RFU-
KeepBitGrid
DataEn
TxLastBits
Access
rights
r/w
r/w
r/w
Table 142. TxDataNum bits
Bit
Symbol
Description
7to5
RFU
-
4
KeepBitGrid
If set, the time between consecutive transmissions starts is a multiple
of the ETU.
3
DataEn
If cleared - it is possible to send a single symbol pattern
If set - data is sent
2 to 0
TxLastBits
Defines how many bits of the last data byte to be sent. If set to 000b all
bits of the last data byte are sent.
Note - bits are skipped at the end of the byte.
Example - Data byte B2h (sent LSB first).
TxLastBits = 011b (3h) => 010b (LSB first) is sent
TxLastBits = 110b (6h) => 010011b (LSB first) is sent


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