There hasn't been nearly enough detail provided. Without that, nobody can be expected to offer a reasonable solution to this or any other problem.

However ... there are PLENTY of people "out there" who have no clue as to how one has to go about creating a clock of a specific rate. Few of the newer users even have any idea about what assembly language is. We've all choked on the remarks such as, "It's just like programming the PC ... it is, after all, 'C'." Some of these folks don't realize that, if you use 10 instruction cycles to generate a pulse with a 10 instruction cycle period, you have no time at all left over to do anything. Only a few have actually tried to see how fast a clock they can generate by fiddling a port bit. I suspect that some of the things we've seen recently are the product of school assignments that are completely absurd because the instructor is nearly as ignorant as the student.

RE