ST STM32F446 Series

RM0390 Rev 4 873/1328
RM0390 Serial peripheral interface/ inter-IC sound (SPI/I2S)
896
• In transmission mode:
If 0x8EAA33 has to be sent (24-bit):
Figure 321. Transmitting 0x8EAA33
• In reception mode:
If data 0x8EAA33 is received:
Figure 322. Receiving 0x8EAA33
Figure 323. I
2
S Philips standard (16-bit extended to 32-bit packet frame with
CPOL = 0)
When 16-bit data frame extended to 32-bit channel frame is selected during the I
2
S
configuration phase, only one access to the SPIx_DR register is required. The 16 remaining
bits are forced by hardware to 0x0000 to extend the data to 32-bit format.
If the data to transmit or the received data are 0x76A3 (0x76A30000 extended to 32-bit), the
operation shown in Figure 324 is required.
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