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CLRC663 Datasheet(PDF) 73 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) 73 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
73 of 132
NXP Semiconductors
CLRC663
Contactless reader IC
9.6.4 RxColl
Receiver collision register.
Table 73.
RxColl register (address 0Dh);
Bit
7
6
5
4
3
2
1
0
Symbol
CollPosValid
CollPos
Access
rights
rr
Table 74.
RxColl bits
Bit
Symbol
Description
7
CollPos
Valid
If set to 1, the value of CollPos is valid. Otherwise no collision is detected or
the position of the collision is out of the range of bits CollPos.
6 to 0
CollPos
These bits show the bit position of the first detected collision in a received
frame (only data bits are interpreted). CollPos can only be displayed for the
first 8 bytes of a data stream.
Example:
00h indicates a bit collision in the 1st bit
01h indicates a bit collision in the 2nd bit
08h indicates a bit collision in the 9th bit (1st bit of 2nd byte)
3Fh indicates a bit collision in the 64th bit (8th bit of the 8th byte)
These bits shall only be interpreted in Passive communication mode at 106
kbit/s or ISO/IEC 14443A/MIFARE reader /writer mode or
ISO/IEC 15693/ICODE SLI read/write mode if bit CollPosValid is set.
Note: If RxBitCtrl.RxAlign is set to a value different to 0, this value is included
in the CollPos.
Example: RxAlign = 4h, a collision occurs in the 4th received bit (which is the
last bit of that UID byte). The CollPos = 7h in this case.


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