STMicroelectronics RM0365 Reference Manual page 951

Serial peripheral interface / inter-IC sound (SPI/I2S)
Bit 2 SSOE: SS output enable
Note: This bit is not used in SPI TI mode.
Bit 1 TXDMAEN: Tx buffer DMA enable
When this bit is set, a DMA request is generated whenever the TXE flag is set.
Bit 0 RXDMAEN: Rx buffer DMA enable
When this bit is set, a DMA request is generated whenever the RXNE flag is set.
951/1080
0: SS output is disabled in master mode and the SPI interface can work in multimaster
configuration
1: SS output is enabled in master mode and when the SPI interface is enabled. The SPI
interface cannot work in a multimaster environment.
0: Tx buffer DMA disabled
1: Tx buffer DMA enabled
0: Rx buffer DMA disabled
1: Rx buffer DMA enabled
DocID025202 Rev 7
RM0365