CLRC663 Datasheet, PDF (88/132 Pages) NXP Semiconductors – Contactless reader IC

NXP Semiconductors
CLRC663
Contactless reader IC
Table 139. RxCrcCon bits
Bit
Symbol
Description
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
0h
0000h
00h
1h
6363h
12h
2h
A671h
BFh
3h
FFFEh
FDh
4h
-
-
5h
-
-
6h
User defined
User defined
7h
FFFFh
FFh
CRC5
00h
12h
-
-
-
-
User defined
1Fh
9.10 Transmitter configuration registers
9.10.1 TxDataNum
Table 141. TxDataNum register (address 2Eh)
Bit
7
6
5
Symbol
RFU
RFU-
RFU-
Access
rights
4
KeepBitGrid
r/w
3
DataEn
r/w
2
1
0
TxLastBits
r/w
Table 142. TxDataNum bits
Bit
Symbol
Description
7 to 5 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
CLRC663
Product data sheet
COMPANY PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.3 — 3 April 2012
171133
© NXP B.V. 2012. All rights reserved.
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