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CLRC663 Datasheet(PDF) 87 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 87 Page - NXP Semiconductors |
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87 / 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 87 of 132 NXP Semiconductors CLRC663 Contactless reader IC Remark: User defined CRC preset values can be configured by EEprom (see Section 8.7.2.1, Table 34 “Configuration area (Page 0)”). 9.9.2 RxCrcCon 3 to 2 TxCRCtype Defines which type of CRC (CRC8/CRC16/CRC5) is calculated: • 00h -- CRC5 • 01h -- CRC8 • 02h -- CRC16 • 03h -- RFU 1 TxCRCInvert if set, the resulting CRC is inverted and attached to the data frame (ISO/IEC 3309) 0 TxCRCEn if set, a CRC is appended to the data stream Table 137. Transmitter CRC preset value configuration TXPresetVal[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 136. TxCrcPreset bits Bit Symbol Description Table 138. RxCrcCon register (address 2Dh) Bit 7 6 5 4 3 2 1 0 Symbol RxForceCRCWrite RXPresetVal RXCRCtype RxCRCInvert RxCRCEn Access rights r/w r/w r/w r/w r/w Table 139. RxCrcCon bits Bit Symbol Description 7 RxForceCrc Write If set, the received CRC byte(s) are copied to the FIFO. If cleared CRC Bytes are only checked, but not copied to the FIFO. This bit has to be always set in case of a not byte aligned CRC (e.g. ISO/IEC 18000-3 mode 3/ EPC Class-1HF) 6 to 4 RXPresetVal Defines the CRC preset value (Hex.) for transmission. (see Table 140). |
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