MFRC523 查看數據表（PDF） - NXP Semiconductors.
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MFRC523 Datasheet PDF : 98 Pages
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NXP Semiconductors
MFRC523
Contactless reader IC
Table 6. MOSI and MISO byte order
Line
Byte 0
Byte 1
Byte 2
To
MOSI
address 0 address 1 address 2 ...
MISO
X[1]
data 0
data 1
...
[1] X = Do not care.
Remark: The MSB must be sent first.
Byte n
address n
data n − 1
Byte n + 1
00
data n
8.3.2.2 SPI write data
To write data to the MFRC523 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]
8.3.2.3 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 MFRC523 the
MSB is set to logic 1. To write data to the MFRC523 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
8.3.3 UART interface
8.3.3.1 Connection to a host
MFRC523
RX
RX
TX
TX
DTRQ
MX
DTRQ
MX
001aal158
Fig 8. UART connection to microcontrollers
MFRC523_33
Product data sheet
PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.3 — 5 March 2010
115233
© NXP B.V. 2010. All rights reserved.
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