WD or prescale

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Hi!

I want to use 128kHz on my ATTiny861 to lower the power consumption. Whats the best way to do that? Using watchdog osc, set fuses, or using prescale one the µController.

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t861 is a modern AVR with a CLKPR register so wouldn't that be the obvious way to throttle the clock - dynamically even - crank it up when you need it - wind it back when you don't.