frdm-K64F clock setting

[daveboyle]

Hi, I have the clock on my frdm-K64F set to 120mhz thanks to Erich Styger's article. But in my PPG component (KDS 3.0) the timing period steps are all decimal equivalents of one third. Like .33333 or .6666 microseconds. Is it possible to set the clock to another value so that the PPG times and steps will be even multiples of a microsecond? Like .5 or 1.0 usec? How would I set that up?

[ZhangJennie · Accepted solution]

Hi,

the solution is to trim the Internal oscillator to 31.25KHz.

thus we can get a integer number MCG FLL output. so setting PPG period as 1us is also possible.

see my attached demo code.

can this help you?
Have a great day,
Zhang Jun

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