RX95HF Datasheet, PDF (13/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

RX95HF
Communication protocols
4.1.2
Caution:
Interrupt mode
When the RX95HF is configure to use the SPI serial interface, pin IRQ_OUT is used to give
additional information to user. When the RX95HF is ready to send back a reply, it sends an
Interrupt Request by setting a low level on pin IRQ_OUT, which remains low until the host
reads the data.
The application can use the Interrupt mode to skip the polling stage.
SPI communication is MSB first.
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