MFRC522 datasheet(47/96 Pages) NXP

47 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

47 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.2.4

RxModeReg register

Deﬁnes the data rate during reception.

Table 58.

TxModeReg register bit descriptions

Bit

Symbol

Value

Description

TxCRCEn

enables CRC generation during data transmission

Remark: can only be set to logic 0 at 106 kBd

6 to 4

TxSpeed[2:0]

deﬁnes the bit rate during data transmission

the MFRC522 handles transfer speeds up to

848 kBd

000

106 kBd

001

212 kBd

010

424 kBd

011

848 kBd

100

reserved

101

reserved

110

reserved

111

reserved

InvMod

modulation of transmitted data is inverted

2 to 0

reserved

reserved for future use

Table 59.

RxModeReg register (address 13h); reset value: 00h bit allocation

Bit

Symbol

RxCRCEn

RxSpeed[2:0]

RxNoErr

RxMultiple

reserved

Access

R/W

Table 60.

RxModeReg register bit descriptions

Bit

Symbol

Value

Description

RxCRCEn

enables the CRC calculation during reception

Remark: can only be set to logic 0 at 106 kBd

6 to 4

RxSpeed[2:0]

deﬁnes the bit rate while receiving data

the MFRC522 handles transfer speeds up to 848 kBd

000

106 kBd

001

212 kBd

010

424 kBd

011

848 kBd

100

reserved

101

reserved

110

reserved

111

reserved

RxNoErr

an invalid received data stream (less than 4 bits received) will

be ignored and the receiver remains active

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