MFRC522 datasheet(9/96 Pages) NXP

9 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

9 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

8.1.2 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 MFRC522 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

MFRC522 and a microcontroller. The implemented interface is in accordance with the SPI

standard.

The timing speciﬁcation is given in Section 14.1 on page 75.

The MFRC522 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 MFRC522 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 MFRC522 on the falling clock edge and is stable

during the rising clock edge.

8.1.2.1

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.

[1]

X = Do not care.

Remark: The MSB must be sent ﬁrst.

Fig 7.

SPI connection to host

001aak586

MFRC522

SCK

MOSI

MISO

NSS

Table 6.

MOSI and MISO byte order

Line

Byte 0

Byte 1

Byte 2

Byte n

Byte n + 1

MOSI

address 0

address 1

address 2

...

address n

MISO

X[1]

data 0

data 1

...

data n

− 1

data n

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