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RC522 Datasheet(PDF) 33 Page - NXP Semiconductors

Part # RC522
Description  Contactless Reader IC
PDF  109 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

RC522 Datasheet(HTML) 33 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
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
7
6
5
4
3
2
1
0
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
7
6
5
4
3
2
1
0
Symbol
CRCResultMSB
Access
Rights
r
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
register Status1Reg is set to logic 1.
Table 75:
CRCResultReg register (address 22h); reset value: FFh
Bit
7
6
5
4
3
2
1
0
Symbol
CRCResultLSB
Access
Rights
r
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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