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MFRC522 Datasheet(PDF) 74 Page - NXP Semiconductors |
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MFRC522 Datasheet(HTML) 74 Page - NXP Semiconductors |
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74 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 74 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 18.3.1.7 Receive Command The MFRC522activates the receiver path and waits for any data stream to be received. The correct settings have to be chosen before starting this command. This command terminates automatically when the received data stream ends. This is indicated either by the end of frame pattern or by the length byte depending on the selected framing and speed. Remark: If the bit RxMultiple in the RxModeReg register is set to logic 1, the Receive command does not terminate automatically. It has to be terminated by activating any other command in the CommandReg register. 18.3.1.8 Transceive Command This circular command repeats transmitting data from the FIFO and receiving data from the RF field continuously. The first action is transmitting and after a transmission the command is changed to receive a data stream. Each transmission process has to be started by setting bit StartSend in the register BitFramingReg to logic 1. This command has to be cleared by software by writing any command to register CommandReg e.g. the command idle. Remark: If the bit RxMultiple in register RxModeReg is set to logic 1, this command will never leave the receiving state, because the receiving will not be cancelled automatically. 18.3.1.9 MFAuthent Command This command handles the MIFARE® authentication to enable a secure communication to any MIFARE® classic card. The following data shall be written to the FIFO before the command can be activated: • Authentication command code (60h, 61h) • Block address • Sector key byte 0 • Sector key byte 1 • Sector key byte 2 • Sector key byte 3 • Sector key byte 4 • Sector key byte 5 • Card serial number byte 0 • Card serial number byte 1 • Card serial number byte 2 • Card serial number byte 3 In total 12 bytes shall be written to the FIFO. Remark: When the MFAuthent command is active, any FIFO access is blocked. Anyhow if there is an access to the FIFO, the bit WrErr in the ErrorReg register is set. |
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