I need to use attiny1634 with 1.8V power supply and fcpu=2MHz. According to Atmel Datasheet (Atmel-8303H-AVR-ATtiny1634-Datasheet_02/2014, p.228, Fig. 24-1) this is the maximum frequency for such power supply.
Unfortunately, there is a problem to buy 2MHz quarc oscillator in small smd case, so I would like to apply following solution:
1) to use 8MHz oscillator,
2) to start with fuse DIV8, so processor starts on 1MHz clock
3) and to reconfigure clock prescaller to /4 in order to obtain fcpu=2MHz.
Will this work properly?
I am not sure if the frequency limit from documentation does also apply for the oscillator circuit (that is before clock prescaller)?