ST25R3910 datasheet(19/65 Pages) STMICROELECTRONICS

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19 / 65 page

DocID029768 Rev 2

19/65

ST25R3910

Functional overview

Figure 5. SPI communication: writing a single byte

Figure 6. SPI communication: writing multiple bytes

Reading data from addressable registers (Read mode)

The command control byte for a read command consists of a command code and an

address. After the command code, the address of register to be read has to be provided

from the MSB to the LSB. Then one or more data bytes can be transferred from the SPI

slave to the master, always from the MSB to the LSB. As in case of write, the read command

supports auto-incrementing address. To transfer bytes from consecutive addresses, SPI

master has to keep the SEN signal high and the SCLK has to be active as long as data need

to be read from the slave.

SDATAI is sampled at the falling edge of SCLK, data to be read from the ST25R3910

internal register is driven to SDATAO pin on rising edge of SCLK and is sampled by the

MCU at the falling edge of SCLK.

ST25R3910 bảng dữ liệu(PDF) 19 Page - STMicroelectronics