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ST25R3920 数据表(PDF) 53 Page - STMicroelectronics

部件名 ST25R3920
功能描述  Automotive high performance NFC reader for CCC digital key and car center console
PDF  152 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST25R3920 数据表(HTML) 53 Page - STMicroelectronics

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DS13261 Rev 9
53/152
ST25R3920
Application information
151
Figure 20 shows how to read a single byte from a register.
Figure 20. Reading a single byte from a register
Loading data into FIFO or PT_Memory (FIFO/PT_Memory load)
Loading data into FIFO or PT_Memory is similar to writing data into addressable registers.
After the I2C slave address the mode byte to trigger a load of the FIFO or selected
PT_Memory area is sent (see Table 9) followed by the data bytes to be loaded.
Figure 21 shows how to load data into the FIFO.
Figure 21. FIFO load
Reading data from the FIFO
Reading data from the FIFO is similar to reading data from addressable registers. After the
I2C slave address the mode byte to trigger a read of the FIFO is sent. After receiving the
FIFO read mode byte the ST25R3920 sends data bytes from the FIFO for as long as the
MCU keeps reading the bus.
Figure 22. FIFO read
MS51655V2
SCL
SDA
A
6
A
5
A
4
A
3
A
2
A
1
A
0
1
R
5
R
4
R
3
R
2
R
1
A
C
K
P
S
Slave address
A
6
A
5
A
4
A
3
A
2
A
1
R
0
A
C
K
A
0
1
Register address
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Data
S
Slave address
0
0
A
C
K
N
A
K
MS51656V1
SCL
SDA
A
6
A
5
A
4
A
3
A
2
A
1
A
0
0
0 00 000
A
C
K
1
P
S
Data
Slave address
D
7
D
6
D
5
D
4
D
3
D
2
0
A
C
K
D
1
D
0
D
3
D
2
D
1
D
0
A
C
K
D
5
D
4
D
7
D
6
Data
FIFO load
A
C
K
MS51657V1
SCL
SDA
A
6
A
5
A
4
A
3
A
2
A
1
A
0
0
0 01
111
A
C
K
1
S
Slave address
1
A
C
K
FIFO read
P
Slave address
A
2
A
1
A
0
1
A
C
K
A
4
A
3
A
6
A
5
S
Data
D
3
D
2
D
1
D
0
N
A
K
D
5
D
4
D
7
D
6



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