STMicroelectronics STM32F405 Reference Manual page 916

Serial peripheral interface (SPI)
Bits 5:4 I2SSTD: I2S standard selection
2
00: I S Philips standard.
01: MSB justified standard (left justified)
10: LSB justified standard (right justified)
11: PCM standard
For more details on I
Note: For correct operation, these bits should be configured when the I
Bit 3 CKPOL: Steady state clock polarity
2
0: I S clock steady state is low level
2
1: I S clock steady state is high level
Note: For correct operation, this bit should be configured when the I
This bit is not used in SPI mode
Bits 2:1 DATLEN: Data length to be transferred
00: 16-bit data length
01: 24-bit data length
10: 32-bit data length
11: Not allowed
Note: For correct operation, these bits should be configured when the I
This bit is not used in SPI mode.
Bit 0 CHLEN: Channel length (number of bits per audio channel)
0: 16-bit wide
1: 32-bit wide
The bit write operation has a meaning only if DATLEN = 00 otherwise the channel length is fixed to
32-bit by hardware whatever the value filled in. Not used in SPI mode.
Note: For correct operation, this bit should be configured when the I
2
28.5.9 SPI_I S prescaler register (SPI_I2SPR)
Address offset: 0x20
Reset value: 0000 0010 (0x0002)
15 14 13
Reserved
916/1731
2
S standards, refer to
12 11 10 9
MCKOE
rw
DocID018909 Rev 11
Section 28.4.3 on page
8 7 6 5
ODD
rw
893. Not used in SPI mode.
2
S is disabled.
2
S is disabled.
2
S is disabled.
2
S is disabled.
4 3 2 1
I2SDIV
rw
RM0090
0