Teensy 4.1 CPU frequency steps?

[Srx]

I've noticed that the Teensy 4.1 page mentions very specific MHz on the product page:



Is there any reason for this? I run my teensies through PlatformIO settings mostly on 240MHz and I'm wondering if this cause any problem to run Teensy 4.1 on "odd" frequencies?

 

[defragster]

Anything can work in steps of some couple MHz auto adjusted versus requested value based on clock math.
Certain select frequencies are 'sweet' spots: 600 Max in Spec, 528 optimal speed and current design, and others going down to 24 where USB still works. And those going upwards

 

[MarkT]

I believe on of the main system clocks maxes at 150MHz (w/o overclocking), so multiples of that are used (the large datasheet has details of all the PLLs and clock domain/trees and if you have the patience that may answer a lot of questions about which frequencies are used). Certain peripherals may place constraints on some of the clocks, such as USB.

 

[Chris O.]

If you really want to dig into the Clocks or PLL settings I prefer to mess with LINK: MCUXpresso Config Tools.