13.1.2 I/O Clock – clk_I/O

The I/O clock is used by the majority of the I/O modules, like Timer/Counters, SPI, and USART. The I/O clock is also used by the External Interrupt module, but note that some external interrupts are detected by asynchronous logic, allowing such interrupts to be detected even if the I/O clock is halted. Also note that address recognition in the TWI module is carried out asynchronously when clk_I/O is halted, enabling TWI address reception in all sleep modes.

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13.1.2 I/O Clock – clkI/O

13.1.2 I/O Clock – clk_I/O