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MFRC522 Datasheet(PDF) 46 Page - NXP Semiconductors

Part # MFRC522
Description  Contactless reader IC
PDF  96 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

MFRC522 Datasheet(HTML) 46 Page - NXP Semiconductors

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MFRC522_33
© NXP B.V. 2009. All rights reserved.
Product data sheet
PUBLIC
Rev. 3 — 26 October 2009
112133
46 of 96
NXP Semiconductors
MFRC522
Contactless reader IC
9.3.2.2
ModeReg register
Defines general mode settings for transmitting and receiving.
9.3.2.3
TxModeReg register
Defines the data rate during transmission.
Table 55.
ModeReg register (address 11h); reset value: 3Fh bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
MSBFirst reserved
TxWaitRF
reserved
PolMFin
reserved
CRCPreset[1:0]
Access
R/W
-
R/W
-
R/W
-
R/W
Table 56.
ModeReg register bit descriptions
Bit
Symbol
Value
Description
7
MSBFirst
1
CRC coprocessor calculates the CRC with MSB first
in the CRCResultReg register the values for the
CRCResultMSB[7:0] bits and the CRCResultLSB[7:0] bits are bit
reversed
Remark: during RF communication this bit is ignored
6
reserved
-
reserved for future use
5
TxWaitRF
1
transmitter can only be started if an RF field is generated
4
reserved
-
reserved for future use
3
PolMFin
defines the polarity of pin MFIN
Remark: the internal envelope signal is encoded active LOW,
changing this bit generates a MFinActIRq event
1
polarity of pin MFIN is active HIGH
0
polarity of pin MFIN is active LOW
2
reserved
-
reserved for future use
1 to 0
CRCPreset
[1:0]
defines the preset value for the CRC coprocessor for the CalcCRC
command
Remark: during any communication, the preset values are
selected automatically according to the definition of bits in the
RxModeReg and TxModeReg registers
00
0000h
01
6363h
10
A671h
11
FFFFh
Table 57.
TxModeReg register (address 12h); reset value: 00h bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
TxCRCEn
TxSpeed[2:0]
InvMod
reserved
Access
R/W
D
R/W
-



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