MFRC522 datasheet(48/109 Pages) NXP

48 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

48 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

10.2.3 Write data

To write data to the MFRC522 using the SPI interface the following byte order has to be

used. It is possible to write out up to n-data bytes by only sending one’s address byte.

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

Remark: The most significant bit (MSB) has to be send first.

10.2.4 Address byte

The address byte has to fulfil the following format:

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

MSB bit is set to logic 1. To write data to the MFRC522 the MSB bit has to be set to

logic 0. The bits 6 to 1 define the address and the LSB shall be set to logic 0.

10.3 UART Interface

10.3.1 Connection to a host

Remark: DTRQ and MX can be disabled by clearing the bit RS232LineEn in register

TestPinEnReg.

Table 137: Byte Order for MOSI and MISO

byte 0

byte 1

byte 2

byte n

byte n+1

MOSI

adr 0

data 0

data 1

……..

data n-1

data n

MISO

……..

Table 138. Address byte 0 register; address MOSI

1 (read)

0 (write)

address

RFU

MSB

LSB

Fig 8.

Connection to

μ-Controllers with UART.

DTRQ

RC522

DTRQ

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