Figure 313. Txe/Rxne/Bsy Behavior In Master / Full-Duplex Mode (Bidimode - ST STM32F413 Reference Manual

Serial peripheral interface/ inter-IC sound (SPI/I2S)
always transacted and processed by the master even if the slave cannot not prepare them
correctly in time. It is preferable for the slave to use DMA, especially when data frames are
shorter and bus rate is high.
Each sequence must be encased by the NSS pulse in parallel with the multislave system to
select just one of the slaves for communication. In single slave systems, using NSS to
control the slave is not necessary. However, the NSS pulse can be used to synchronize the
slave with the beginning of each data transfer sequence. NSS can be managed either by
software or by hardware (see
Refer to
duplex and slave full-duplex mode.

Figure 313. TXE/RXNE/BSY behavior in master / full-duplex mode (BIDIMODE=0,

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Section 29.3.4: Multi-master
Figure 313 and Figure 314
RXONLY=0) in the case of continuous transfers
for a description of continuous transfers in master / full-
DocID029473 Rev 3
communication).
RM0430