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When I read the page before, I was thinking that the 8MHz crystal on the Pro Mini was being used but being divided by 8 to get 1MHz. But no, it is the internal oscillator.
Other way is to switch to internal oscillator at 8MHz and divide frequency by 8. That way it will operate at 1MHz.
HarryDutch wrote: What do you mean with the ATMega328p 28 pin dip?
If you want to know everything about power saving mcu's then this is a must read: