MFRC522 datasheet(54/96 Pages) NXP

54 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

54 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.3 Page 2: Conﬁguration

9.3.3.1

Reserved register 20h

Functionality is reserved for future use.

9.3.3.2

CRCResultReg registers

Shows the MSB and LSB values of the CRC calculation.

Remark: The CRC is split into two 8-bit registers.

Table 85.

Reserved register (address 20h); reset value: 00h bit allocation

Bit

Symbol

Access

reserved

Table 86.

Reserved register bit descriptions

Bit

Symbol

Description

7 to 0

reserved

reserved for future use

Table 87.

CRCResultReg (higher bits) register (address 21h); reset value: FFh bit

allocation

Bit

Symbol

CRCResultMSB[7:0]

Access

Table 88.

CRCResultReg register higher bit descriptions

Bit

Symbol

Description

7 to 0

CRCResultMSB

[7:0]

shows the value of the CRCResultReg register’s most signiﬁcant

byte

only valid if Status1Reg register’s CRCReady bit is set to logic 1

Table 89.

CRCResultReg (lower bits) register (address 22h); reset value: FFh bit allocation

Bit

Symbol

CRCResultLSB[7:0]

Access

Table 90.

CRCResultReg register lower bit descriptions

Bit

Symbol

Description

7 to 0

CRCResultLSB

[7:0]

shows the value of the least signiﬁcant byte of the CRCResultReg

only valid if Status1Reg register’s CRCReady bit is set to logic 1

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