ST STM32WL55JC

Serial peripheral interface / integrated interchip sound (SPI/I2S) RM0453
1290/1454 RM0453 Rev 2
Figure 371. MSB justified 16-bit extended to 32-bit packet frame
LSB justified standard
This standard is similar to the MSB justified standard (no difference for the 16-bit and 32-bit
full-accuracy frame formats).
The sampling of the input and output signals is the same as for the I
2
S Philips standard.
Figure 372. LSB justified 16-bit or 32-bit full-accuracy
Figure 373. LSB justified 24-bit frame length
• In transmission mode:
If data 0x3478AE have to be transmitted, two write operations to the SPIx_DR register
are required by software or by DMA. The operations are shown below.
MS30102V1
CK
WS
SD
Transmission
Reception
16-bit data
MSB LSB
Channel left 32-bit
Channel right
16-bit remaining
0 forced
MS30103V1
CK
WS
SD
Transmission
Reception
16- or 32-bit data
MSB
LSB
Channel left
Channel right
MSB
MS30104V1
CK
WS
SD
Transmission
Reception
8-bit data
0 forced
MSB
LSB
Channel left 32-bit
Channel right
24-bit remaining