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MFRC522 Datasheet(PDF) 41 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) 41 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
41 of 96
NXP Semiconductors
MFRC522
Contactless reader IC
9.3.1.9
Status2Reg register
Contains status bits of the receiver, transmitter and data mode detector.
Table 37.
Status2Reg register (address 08h); reset value: 00h bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
TempSensClear
I2CForceHS
reserved
MFCrypto1On
ModemState[2:0]
Access
R/W
R/W
-
D
R
Table 38.
Status2Reg register bit descriptions
Bit
Symbol
Value
Description
7
TempSensClear
1
clears the temperature error if the temperature is below the
alarm limit of 125
°C
6I2CForceHS
I2C-bus input filter settings:
1
the I2C-bus input filter is set to the High-speed mode
independent of the I2C-bus protocol
0
the I2C-bus input filter is set to the I2C-bus protocol used
5 to 4
reserved
-
reserved
3
MFCrypto1On
-
indicates that the MIFARE Crypto1 unit is switched on and
therefore all data communication with the card is encrypted
can only be set to logic 1 by a successful execution of the
MFAuthent command
only valid in Read/Write mode for MIFARE standard cards
this bit is cleared by software
2 to 0
ModemState[2:0]
-
shows the state of the transmitter and receiver state
machines:
000
idle
001
wait for the BitFramingReg register’s StartSend bit
010
TxWait: wait until RF field is present if the TModeReg
register’s TxWaitRF bit is set to logic 1
the minimum time for TxWait is defined by the TxWaitReg
register
011
transmitting
100
RxWait: wait until RF field is present if the TModeReg
register’s TxWaitRF bit is set to logic 1
the minimum time for RxWait is defined by the
RxWaitReg register
101
wait for data
110
receiving



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