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RC522 Datasheet(PDF) 56 Page - NXP Semiconductors

Part # RC522
Description  Contactless Reader IC
PDF  109 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

RC522 Datasheet(HTML) 56 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
56 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
10.4.7 Register Write Access
To write data from the host controller via I2C to a specific register of the MFRC522 the
following frame format shall be used.
The first byte of a frame indicates the device address according to the I2C rules. The
second byte indicates the register address followed by up to n-data bytes. In one frame all
n-data bytes are written to the same register address. This enables for example a fast
FIFO access.
The read/write bit shall be set to logic 0.
Fig 16. First byte following the START procedure.
Bit 6
Bit 5
Bit 4
Bit 0
Bit 3
Bit 2
Bit 1



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