Standard Multi-Slave Communication; Figure 343. Simplex Single Master/Single Slave Application - STMicroelectronics RM0365 Reference Manual

Serial peripheral interface / inter-IC sound (SPI/I2S)
Figure 343. Simplex single master/single slave application (master in transmit-only/
1. The NSS pins can be used to provide a hardware control flow between master and slave. Optionally, the
pins can be left unused by the peripheral. Then the flow has to be handled internally for both master and
slave. For more details see
2. An accidental input information is captured at the input of transmitter Rx shift register. All the events
associated with the transmitter receive flow must be ignored in standard transmit only mode (e.g. OVF
flag).
3. In this configuration, both the MISO pins can be used as GPIOs.
Note: Any simplex communication can be alternatively replaced by a variant of the half-duplex
communication with a constant setting of the transaction direction (bidirectional mode is
enabled while BDIO bit is not changed).
30.5.3

Standard multi-slave communication

In a configuration with two or more independent slaves, the master uses GPIO pins to
manage the chip select lines for each slave (see
of the slaves individually by pulling low the GPIO connected to the slave NSS input. When
this is done, a standard master and dedicated slave communication is established.
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slave in receive-only mode)
Section 30.5.5: Slave select (NSS) pin
DocID025202 Rev 7
management.
Figure 344.). The master must select one
RM0365