Figure 307. Simplex Single Master/Single Slave Application - ST STM32F446 Series Reference Manual

Advanced arm-based 32-bit mcus

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Figure 307. 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

3. In this configuration, both the MISO pins can be used as GPIOs.

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).

Serial peripheral interface/ inter-IC sound (SPI/I2S)

slave in receive-only mode)

Section 26.3.5: Slave select (NSS) pin

RM0390 Rev 4

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