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I am now urgant.
Thank you. But I must need ready and tested routines for slow frequence (31kHz, 125kHz, 250kHz etc.).
Please for me.
In C? ASM? For microseconds? seconds? weeks? 12 clock? 6 clock?, 1 clock? CPU? Wait loop or timer?
C lopping delay routines are never guaranteed. the compiler version can change things.
the spelling is "Urgent"
A delay for 250kHz is no fun at all. 4us delays do not produce 250kHz - every single interrupt will consume time. And with a 4us delay you have to subtract the time needed to actually do something - you never delay without doing something.
Are you going to produce a frequency output on a port pin? Then you do not use a delay. You do not want to let the processor manually toggle a poin every 4us (or possibly 2us if you want real 250kHz square wave.
There are many easier methods of producing a square wave than using a microcontroller - especially when producing a square wave that will not leave any processing capacity left for doing other things.
So please start by telling why you need your delays - maybe you just need to configure the timer(s) in your unknown processor and can then let a timer compare-match handle everything.