Can the nRF52840 use other clock frequencies than 64 or 32 MHz?

[henryh]

I'd like to clock the nRF52840 at the same frequency as my converters. Is there any problem with using a somewhat different frequency than the 64 MHz (or 32mhZ) crystal? If it is OK, what is the permissible frequency range?

[endnode]

nRF52840 specification is clear: similar to all other nRF5x chips only specific high-frequency clock source is possible (and required if you want to use 2.4GHz radio interface). In case of nRF52840 it is 64MHz crystal.