MFRC522_(2007) View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
MFRC522_ Datasheet PDF : 109 Pages
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NXP Semiconductors
MFRC522
Contactless Reader IC
9.2.2.2 ModeReg
Defines general mode settings for transmitting and receiving.
Table 41: ModeReg register (address 11h); reset value: 3Fh
Bit
7
6
5
4
3
Symbol MSBFirst
-
TxWaitRF
-
PolMFin
Access r/w
RFU
r/w
RFU
r/w
Rights
2
-
RFU
1
0
CRCPreset
r/w
Table 42: Description of ModeReg bits
Bit
Symbol
Description
7
MSBFirst
Set to logic 1, the CRC co-processor calculates the CRC with MSB
first and the CRCResultMSB and the CRCResultLSB in the
CRCResultReg register are bit reversed.
Remark: During RF communication this bit is ignored.
6
-
Reserved for future use.
5
TxWaitRF
Set to logic 1 the transmitter can only be started, if an RF field is
generated.
4
-
Reserved for future use.
3
PolMFin
PolMFin defines the polarity of the MFIN pin. Set to logic 1, the polarity
of MFIN pin is active high. Set to logic 0 the polarity of MFIN pin is
active low.
Remark: The internal envelope signal is coded active low.
Changing this bit will generate a MFinActIRq event.
2
-
Reserved for future use.
1 to 0
CRCPreset
Defines the preset value for the CRC co-processor for the command
CalCRC.
Remark: During any communication, the preset values is selected
automatically according to the definition in the bits in
RxModeReg and TxModeReg.
Value Description
00
0000
01
6363
10
A671
11
FFFF
9.2.2.3 TxModeReg
Defines the data rate during transmission.
Table 43: TxModeReg register (address 12h); reset value: 00h
Bit
7
6
5
4
3
2
1
0
Symbol TxCRCEn
TxSpeed
InvMod
-
Access
r/w
Rights
dy
r/w
RFU
112132
Product data sheet
Rev. 3.2 — 22 May 2007
© NXP B.V. 2007. All rights reserved.
25 of 109
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