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MFRC523 Datasheet(PDF) 10 Page - NXP Semiconductors

Part No. MFRC523
Description  Contactless reader IC
Download  98 Pages
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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MFRC523 Datasheet(HTML) 10 Page - NXP Semiconductors

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MFRC523_33
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.3 — 5 March 2010
115233
10 of 98
NXP Semiconductors
MFRC523
Contactless reader IC
8.3.2 Serial Peripheral Interface
A serial peripheral interface (SPI compatible) is supported to enable high-speed
communication to the host. The interface can handle data speeds up to 10 Mbit/s. When
communicating with a host, the MFRC523 acts as a slave, receiving data from the
external host for register settings, sending and receiving data relevant for RF interface
communication.
An interface compatible with SPI enables high-speed serial communication between the
MFRC523 and a microcontroller. The implemented interface is in accordance with the SPI
standard.
The timing specification is given in Section 14.1 on page 77.
The MFRC523 acts as a slave during SPI communication. The SPI clock signal SCK must
be generated by the master. Data communication from the master to the slave uses the
MOSI line. The MISO line is used to send data from the MFRC523 to the master.
Data bytes on both MOSI and MISO lines are sent with the MSB first. Data on both MOSI
and MISO lines must be stable on the rising edge of the clock and can be changed on the
falling edge. Data is provided by the MFRC523 on the falling clock edge and is stable
during the rising clock edge.
8.3.2.1
SPI read data
Reading data using SPI requires the byte order shown in Table 6 to be used. It is possible
to read out up to n-data bytes.
The first byte sent defines both the mode and the address.
D6
MX
MOSI
ADR_0
D5
DTRQ
SCK
ADR_1
D4
-
-
ADR_2
D3
-
-
ADR_3
D2
-
-
ADR_4
D1
-
-
ADR_5
Table 5.
Connection protocol for detecting different interface types …continued
Pin
Interface type
UART (input)
SPI (output)
I2C-bus (I/O)
Fig 7.
SPI connection to host
001aal159
MFRC523
SCK
SCK
MOSI
MOSI
MISO
MISO
NSS
NSS


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