Figure 372. Msb Justified 16-Bit Extended To 32-Bit Packet Frame; Figure 373. Lsb Justified 16-Bit Or 32-Bit Full-Accuracy; Figure 374. Lsb Justified 24-Bit Frame Length - STMicroelectronics STM32WL5 Series Reference Manual

Serial peripheral interface / integrated interchip sound (SPI/I2S)
CK
WS
SD
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
CK
WS
SD
•
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.
1286/1450

Figure 372. MSB justified 16-bit extended to 32-bit packet frame

Transmission
16-bit data
MSB
Channel left 32-bit

Figure 373. LSB justified 16-bit or 32-bit full-accuracy

CK
WS
Transmission
16- or 32-bit data
SD
MSB
Channel left

Figure 374. LSB justified 24-bit frame length

8-bit data
0 forced
Reception
16-bit remaining
0 forced
LSB
Reception
LSB
MSB
Channel right
Transmission
24-bit remaining
MSB
Channel left 32-bit
RM0453 Rev 5
Channel right
2
S Philips standard.
Reception
LSB
Channel right
RM0453
MS30102V1
MS30103V1
MS30104V1