ST STM32WL5 Series Reference Manual page 1103

Advanced arm-based 32-bit mcus with sub-ghz radio solution

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Table of Contents

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.

The PECBYTE bit has no effect when the RELOAD bit is set.

Inter-integrated circuit (I2C) interface

RM0453 Rev 1

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