Table 236. Effect Of Low-Power Modes On The I2C - STMicroelectronics STM32WL5 Series Reference Manual

RM0453
34.5 I2C low-power modes
Mode
Sleep
(1)
Stop
Standby
1. Refer to
specific Stop mode is not supported, the instance must be disabled before entering this Stop mode.
2. In Stop 2 mode, only I2C3 register content is kept. The I2C1 and I2C2 instances are powered down and
must be reinitialized after exiting Stop 2 mode.

Table 236. Effect of low-power modes on the I2C

No effect. I2C interrupts cause the device to exit the Sleep mode.
The I2C registers content is kept
– WUPEN = 1 and I2C is clocked by an internal oscillator (HSI16): the address
recognition is functional. The I2C address match condition causes the device to exit the
Stop mode.
– WUPEN = 0: the I2C must be disabled before entering Stop mode.
The I2C peripheral is powered down and must be reinitialized after exiting Standby mode.
Section 34.3 for information about the Stop modes supported by each instance. If wake-up from a
Inter-integrated circuit (I2C) interface
Description
(2)
.
RM0453 Rev 5 1097/1450
1113