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CLRC663 Datasheet(PDF) 73 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 73 Page - NXP Semiconductors |
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73 / 132 page  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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