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MFRC522 Datasheet(PDF) 57 Page - NXP Semiconductors |
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MFRC522 Datasheet(HTML) 57 Page - NXP Semiconductors |
57 / 109 page 112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 57 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 10.4.8 Register Read Access To read out data from a specific register address of the MFRC522 the host controller shall use the procedure: First a write access to the specific register address has to be performed as indicated in the following frame. The first byte of a frame indicates the device address according to the I2C rules. The second byte indicates the register address. No data bytes are added. The read/write bit shall be 0. Having performed this write access, the read access can start. The host has to send the device address of the MFRC522. As an answer to this the MFRC522 responds with the content of this register. In one frame all n-data bytes could be read from the same register address. This enables for example a fast FIFO access or register polling. The read/write bit shall be set to logic 1. Fig 17. Register Read and Write Access Write Cycle Read Cycle SA SO I2C slave address A7-A0 0 (W) Ack Joiner register address A5-A0 Ack 0 DATA [7..0] [0..n] Ack 0 SA SO I2C slave address A7-A0 0 (W) Ack Joiner register address A5-A0 Ack 0 0 SA I2C slave address A7-A0 1 (R) Ack DATA [7..0] 0..n Ack [0..n] DATA [7..0] Nack SO sent by master sent by slave SA start condition SO stop condition ACK acknowledge Nack not acknowlege (W) write cycle (R) read cycle Optional, if the previous access was on the same register address |
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