mfrc522 NXP Semiconductors, mfrc522 Datasheet - Page 25

• Manufacturer Part Number: mfrc522
• Description: Contactless Reader Ic
• Manufacturer: NXP Semiconductors

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