Figure 267. Transmitting 0X8Eaa33; Figure 268. Receiving 0X8Eaa33; Figure 269. I; Figure 270. Example - ST STM32F205 series Reference Manual

Serial peripheral interface (SPI)
•
In reception mode:
if data 0x8EAA33 is received:

Figure 269. I

When 16-bit data frame extended to 32-bit channel frame is selected during the I
configuration phase, only one access to SPI_DR 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
712/1378

Figure 267. Transmitting 0x8EAA33

First write to Data register
0x8EAA

Figure 268. Receiving 0x8EAA33

First read to Data register
0x8EAA
2
S Philips standard (16-bit extended to 32-bit packet frame with
CK
WS
Transmission
16-bit data
SD
MSB
Channel left 32-bit
Figure 270 is required.
RM0033 Rev 8
Second write to Data register
Only the 8 MSB are sent
to compare the 24 bits
8 LSBs have no meaning
and can be anything
Second read to Data register
0x33XX
Only the 8 MSB are sent
to compare the 24 bits
8 LSBs have no meaning
and can be anything
CPOL = 0)
Reception
16-bit remaining 0 forced
LSB

Figure 270. Example

Only one access to SPIx_DR
0x76A3
0x33XX
Channel right
RM0033
MS19593V1
MS19594V1
MS19599V1
2
S
MS19595V1