RM0033 Rev 9 683/1381
RM0033 Serial peripheral interface (SPI)
734
25.2 SPI and I
2
S main features
25.2.1 SPI features
• Full-duplex synchronous transfers on three lines
• Simplex synchronous transfers on two lines with or without a bidirectional data line
• 8- or 16-bit transfer frame format selection
• Master or slave operation
• Multimaster mode capability
• 8 master mode baud rate prescalers (f
PCLK
/2 max.)
• Slave mode frequency (f
PCLK
/2 max)
• Faster communication for both master and slave
• NSS management by hardware or software for both master and slave: dynamic change
of master/slave operations
• Programmable clock polarity and phase
• Programmable data order with MSB-first or LSB-first shifting
• Dedicated transmission and reception flags with interrupt capability
• SPI bus busy status flag
• SPI TI mode
• Hardware CRC feature for reliable communication:
– CRC value can be transmitted as last byte in Tx mode
– Automatic CRC error checking for last received byte
• Master mode fault, overrun and CRC error flags with interrupt capability
• 1-byte transmission and reception buffer with DMA capability: Tx and Rx requests
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