RM0453 Rev 5 1097/1450
RM0453 Inter-integrated circuit (I2C) interface
1113
34.5 I2C low-power modes
Table 236. Effect of low-power modes on the I2C
Mode Description
Sleep No effect. I2C interrupts cause the device to exit the Sleep mode.
Stop
(1)
1. Refer to Section 34.3 for information about the Stop modes supported by each instance. If wake-up from a
specific Stop mode is not supported, the instance must be disabled before entering this Stop mode.
The I2C registers content is kept
(2)
.
– 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.
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.
Standby The I2C peripheral is powered down and must be reinitialized after exiting Standby mode.
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