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ST25R3916 Arkusz danych(PDF) 56 Page - STMicroelectronics

Numer części ST25R3916
Szczegółowy opis  High performance NFC universal device and EMVCo™ reader
PDF  157 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3916 Arkusz danych(HTML) 56 Page - STMicroelectronics

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Application information
ST25R3916/7
56/157
DS12484 Rev 4
Figure 22 shows how to read a single byte from a register.
Figure 22. 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 11) followed by the data bytes to be loaded.
Figure 23 shows how to load data into the FIFO.
Figure 23. 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 ST25R3916/7 sends data bytes from the FIFO for as long as the
MCU keeps reading the bus.
Figure 24. 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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