MFRC522_ Просмотр технического описания (PDF) - NXP Semiconductors.

Номер в каталоге

Компоненты Описание

производитель

MFRC522_

Contactless reader IC

NXP Semiconductors. 

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.

Table 7. MOSI and MISO byte order

Line

Byte 0

Byte 1

Byte 2

To

MOSI

address 0 data 0

data 1

...

MISO

X[1]

X[1]

X[1]

...

[1] X = Do not care.

Remark: The MSB must be sent first.

Byte n

data n − 1

X[1]

Byte n + 1

data n

X[1]

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.

Table 8. Address byte 0 register; address MOSI

7 (MSB) 6

5

4

3

2

1

0 (LSB)

1 = read address

0

0 = write

8.1.3 UART interface

8.1.3.1 Connection to a host

MFRC522

RX

RX

TX

TX

DTRQ

MX

DTRQ

MX

001aak587

Fig 8. UART connection to microcontrollers

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

RS232LineEn bit.

MFRC522_34

Product data sheet

PUBLIC

All information provided in this document is subject to legal disclaimers.

Rev. 3.4 — 5 March 2010

112134

© NXP B.V. 2010. All rights reserved.

10 of 96

Share Link: