Hi Sinan, As per the SPI protocol, the data is shifted out on the SPI lines based on SPICLK and the SPICLK is generated by the master device only. Both devices send and receive data at the same time. In case master requires the slave to send a data but master doesn't wish to send any new data, it can initiate a dummy data transfer. Eg: Write 0 to master TX, so that the the SPICLK is generated and slave can shift out the data to be sent. Please refer to the SPI Operation chapter in TRM for more information Regards, Veena
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