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RM0008
Serial peripheral interface (SPI)
Bit 10 RXONLY: Receive only
This bit combined with the BIDImode bit selects the direction of transfer in 2-line
unidirectional mode. This bit is also useful in a multislave system in which this particular
slave is not accessed, the output from the accessed slave is not corrupted.
0: Full duplex (Transmit and receive)
1: Output disabled (Receive-only mode)
Note: Not used in I 2 S mode
Bit 9 SSM: Software slave management
When the SSM bit is set, the NSS pin input is replaced with the value from the SSI bit.
0: Software slave management disabled
1: Software slave management enabled
Note: Not used in I 2 S mode
Bit 8 SSI: Internal slave select
This bit has an effect only when the SSM bit is set. The value of this bit is forced onto the
NSS pin and the I/O value of the NSS pin is ignored.
Note: Not used in I 2 S mode
Bit 7 LSBFIRST: Frame format
0: MSB transmitted first
1: LSB transmitted first
Note: Notes : This bit should not be changed when communication is ongoing.
Not used in I 2 S mode
Bit 6 SPE: SPI enable
0: Peripheral disabled
1: Peripheral enabled
Note: Not used in I 2 S mode
Bits 5:3 BR[2:0]: Baud rate control
000: f PCLK /2
001: f PCLK /4
010: f PCLK /8
011: f PCLK /16
100: f PCLK /32
101: f PCLK /64
110: f PCLK /128
111: f PCLK /256
Note: These bits should not be changed when communication is ongoing.
Not used in I 2 S mode
Doc ID 13902 Rev 9
615/995
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