24.7.4 Idle in Target Mode Operation

When the device enters Idle mode, all clock sources remain functional. If the module intends to power down, it disables its own clocks.

In Target mode, incoming SCL is used to receive or transmit data. However, it uses the I³C peripheral clock to run the state machine of the Target to transmit and receive data from the application.

If the module clocks are suspended in Idle mode while having target mode active, the module will most likely need to be re-enabled to synchronize it back up with the I³C bus activity.