19.9 AsynchronousOperation of Timer/Counter2

Projects Programming
1

Hello,

Can someone explain with maybe some examples the datasheet paragraph:

  1. Description of wake up from Power-save or ADC Noise Reduction mode when the timer is clocked asynchronously: When the interrupt condition is met, the wake up process is started on the following cycle of the timer clock, that is, the timer is always advanced by at least one before the processor can read the counter value. After wake-up, the MCU is halted for four cycles, it executes the interrupt routine, and resumes execution from the instruction following SLEEP.

I tend to think this applies to non Timer2 related interrupts, but then I can not explain "the timer is always advanced by at least one" and not at most one.

https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ProductDocuments/DataSheets/ATmega48PB-88PB-168PB-DataSheet-DS40001909B.pdf on page 148

Thank you

2

I think that the interrupt condition can also be matched after several ticks.