MFRC522 datasheet(10/96 Pages) NXP

10 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

10 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

8.1.2.2

SPI write data

To write data to the MFRC522 using SPI requires the byte order shown in Table 7. It is

possible to write up to n data bytes by only sending one address byte.

The ﬁrst send byte deﬁnes both the mode and the address byte.

[1]

X = Do not care.

Remark: The MSB must be sent ﬁrst.

8.1.2.3

SPI address byte

The address byte must meet the following format.

The MSB of the ﬁrst byte deﬁnes the mode used. To read data from the MFRC522 the

MSB is set to logic 1. To write data to the MFRC522 the MSB must be set to logic 0. Bits 6

to 1 deﬁne the address and the LSB is set to logic 0.

8.1.3 UART interface

8.1.3.1

Connection to a host

Remark: Signals DTRQ and MX can be disabled by clearing TestPinEnReg register’s

RS232LineEn bit.

Table 7.

MOSI and MISO byte order

Line

Byte 0

Byte 1

Byte 2

Byte n

Byte n + 1

MOSI

address 0

data 0

data 1

...

data n

− 1

data n

MISO

X[1]

...

X[1]

Table 8.

Address byte 0 register; address MOSI

7 (MSB)

0 (LSB)

1 = read

0 = write

address

Fig 8.

UART connection to microcontrollers

001aak587

MFRC522

DTRQ

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