CLRC663 datasheet(86/177 Pages) NXP

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NXP Semiconductors

CLRC663

High performance multi-protocol NFC frontend CLRC663 and CLRC663 plus

9.9.2 RxCrcCon

Bit

Symbol

RxForceCRCWrite

RXPresetVal

RXCRCtype

RxCRCInvert

RxCRCEn

Access

rights

r/w

Table 142. RxCrcCon register (address 2Dh)

Bit

Symbol

Description

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 following table).

3 to 2

RxCRCtype

Defines which type of CRC (CRC8/CRC16/CRC5) is calculated:

• 00h -- CRC5

• 01h -- CRC8

• 02h -- CRC16

• 03h -- RFU

RxCrcInvert

If set, the CRC check is done for the inverted CRC.

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 143. RxCrcCon bits

RXPresetVal[6...4]

CRC16

CRC8

CRC5

0000h

00h

6363h

12h

A671h

BFh

FFFEh

FDh

User defined

FFFFh

FFh

1Fh

Table 144. Receiver CRC preset value configuration

9.10 Transmitter data configuration registers

9.10.1 TxDataNum

Bit

Symbol

RFU

RFU-

KeepBitGrid

DataEn

TxLastBits

Table 145. TxDataNum register (address 2Eh)

CLRC663

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Product data sheet

Rev. 5.3 — 3 January 2024

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