RC522 datasheet(33/109 Pages) NXP

33 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

33 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.3 Page 2: Configuration

9.2.3.1

Reserved

Functionality is reserved for further use.

9.2.3.2

CRCResultReg

Shows the actual MSB and LSB values of the CRC calculation.

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

Table 71:

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

Bit

Symbol

Access

Rights

RFU

Table 72:

Description of Reserved register bits

Bit

Symbol

Description

7 to 0

Reserved for future use.

Table 73:

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

Bit

Symbol

CRCResultMSB

Access

Rights

Table 74:

Description of CRCResultReg higher bits

Bit

Symbol

Description

7 to 0

CRCResultMSB

This register shows the actual value of the most significant byte of

the CRCResultReg register. It is valid only if bit CRCReady in

Table 75:

CRCResultReg register (address 22h); reset value: FFh

Bit

Symbol

CRCResultLSB

Access

Rights

Table 76:

Description of CRCResultReg lower bits

Bit

Symbol

Description

7 to 0

CRCResultLSB

This register shows the actual value of the least significant byte of

the CRCResult register. It is valid only if bit CRCReady in register

Status1Reg is set to logic 1.

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