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RM0008
Serial peripheral interface (SPI)
Bit 7 PCMSYNC : PCM frame synchronization
0: Short frame synchronization
1: Long frame synchronization
Note: This bit has a meaning only if I2SSTD = 11 (PCM standard is used)
Not used for the SPI mode
Bit 6 Reserved: forced at 0 by hardware
Bit 5:4 I2SSTD : I2S standard selection
00: I 2 S Phillips standard.
01: MSB justified standard (left justified)
10: LSB justified standard (right justified)
11: PCM standard
For more details on I 2 S standards, refer to Section 23.4.2 on page 600
Note: For correct operation, these bits should be configured when the I 2 S is disabled.
Not used in SPI mode
Bit 3 CKPOL : Steady state clock polarity
0: I 2 S clock steady state is low level
1: I 2 S clock steady state is high level
Note: For correct operation, this bit should be configured when the I 2 S is disabled.
Not used in SPI mode
Bit 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 2 S is disabled.
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.
Note: For correct operation, this bit should be configured when the I 2 S is disabled.
Not used in SPI mode
Doc ID 13902 Rev 9
621/995
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