MFRC522 datasheet(20/109 Pages) NXP

20 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

20 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.1.9

Status2Reg

Contains status bits of the receiver, transmitter and data mode detector.

Table 23:

Status2Reg register (address 08h); reset value: 00h

Bit

Symbol

TempSens

Clear

I2CForceHS

MFCrypto1On

Modem State

Access

Rights

r/w

RFU

Table 24:

Description of Status2Reg bits

Bit

Symbol

Description

TempSensClear

Set to logic 1, this bit clears the temperature error, if the temperature

is below the alarm limit of 125

°C.

6I2CForceHS

I2C input filter settings.

Set to logic 1, the I2C input filter is set to the High-speed mode

independent of the I2C protocol.

Set to logic 0, the I2C input filter is set to the used I2C protocol.

5 to 4

Reserved for future use.

MFCrypto1On

This bit indicates that the MIFARE® Crypto1 unit is switched on and

therefore all data communication with the card is encrypted.

This bit can only be set to logic 1 by a successful execution of the

MFAuthent Command. This bit is only valid in Reader/Writer mode

for MIFARE® Standard cards. This bit shall be cleared by software.

2 to 0

Modem State

ModemState shows the state of the transmitter and receiver state

machines.

Status Description

000

IDLE

001

Wait for bit StartSend in register BitFramingReg

010

TxWait: Wait until Rf field is present, if the bit TxWaitRF 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 bit RxWaitRF 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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