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RC522 Datasheet(PDF) 51 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) 51 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
51 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
Write data:
To write data to the MFRC522 using the UART interface the following structure has to be
used.
The first send byte defines both, the mode itself and the address.
Remark: The data byte can be send directly after the address byte on RX.
Address byte:
The address byte has to fulfil the following format:
The MSB of the first byte sets the used mode. To read data from the MFRC522 the MSB is
set to logic 1. To write data to the MFRC522 the MSB has to be set to logic 0. The bit 6 is
reserved for further use and the bits 5 to 0 define the address.
Table 143: Byte Order to Write Data
byte 0
byte 1
RX
adr 0
data 0
TX
adr 0
Fig 10. Schematic Diagram to Write Data.
Table 144. Address byte 0 register; address MOSI
7
6
5
4
3
2
1
0
1 (read)
0 (write)
RFU
address
MSB
LSB



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