MFRC522 datasheet(70/96 Pages) NXP

70 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

70 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

This command automatically terminates when the MIFARE card is authenticated and the

Status2Reg register’s MFCrypto1On bit is set to logic 1.

This command does not terminate automatically if the card does not answer, so the timer

must be initialized to automatic mode. In this case, in addition to the IdleIRq bit, the

TimerIRq bit can be used as the termination criteria. During authentication processing, the

RxIRq bit and TxIRq bit are blocked. The Crypto1On bit is only valid after termination of

the MFAuthent command, either after processing the protocol or writing Idle to the

CommandReg register.

If an error occurs during authentication, the ErrorReg register’s ProtocolErr bit is set to

logic 1 and the Status2Reg register’s Crypto1On bit is set to logic 0.

10.3.1.10

SoftReset

This command performs a reset of the device. The conﬁguration data of the internal buffer

remains unchanged. All registers are set to the reset values. This command automatically

terminates when ﬁnished.

Remark: The SerialSpeedReg register is reset and therefore the serial data rate is set to

9.6 kBd.

MFRC522 Datasheet(PDF) 70 Page - NXP Semiconductors