Inter-integrated circuit (I2C) interface RM0453
1092/1450 RM0453 Rev 5
SMBus master receiver
When the SMBus master wants to receive the PEC followed by a STOP at the end of the
transfer, automatic end mode can be selected (AUTOEND = 1). The PECBYTE bit must be
set and the slave address must be programmed, before setting the START bit. In this case,
after NBYTES - 1 data have been received, the next received byte is automatically checked
versus the I2C_PECR register content. A NACK response is given to the PEC byte, followed
by a STOP condition.
When the SMBus master receiver wants to receive the PEC byte followed by a RESTART
condition at the end of the transfer, software mode must be selected (AUTOEND = 0). The
PECBYTE bit must be set and the slave address must be programmed, before setting the
START bit. In this case, after NBYTES - 1 data have been received, the next received byte
is automatically checked versus the I2C_PECR register content. The TC flag is set after the
PEC byte reception, stretching the SCL line low. The RESTART condition can be
programmed in the TC interrupt subroutine.
Caution: The PECBYTE bit has no effect when the RELOAD bit is set.
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