Fast-mode Plus Inter-integrated circuit (FMPI2C) interface RM0401
564/771 RM0401 Rev 3
FMPI2C_PECR register is automatically transmitted if the master requests an extra byte
after the NBYTES-1 data transfer.
Caution: The PECBYTE bit has no effect when the RELOAD bit is set.
Figure 201. Transfer sequence flowchart for SMBus slave transmitter N bytes + PEC
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