ST25R3920 datasheet(53/152 Pages) STMICROELECTRONICS

53 / 152 page

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

Slave address

Data

Slave address

MS51656V1

SCL

SDA

0 00 000

Data

Slave address

Data

FIFO load

MS51657V1

SCL

SDA

0 01

111

Slave address

FIFO read

Slave address

Data

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