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# PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

## Fixing low frequency of the PRS sequence

Hello Cypress Community

I am trying to use the PRS component in PSoC Creator. One of the requirements that I have is to fix the frequency of the PRS betweeen 100KHz to 200KHz. Essentially the Bandwidth should be 100 kHz, with fixed lower and higher frequency. How can I do this in PSoC ?

Virtually,

Sherlock

1 Solution
Esteemed Contributor II

## Re: Fixing low frequency of the PRS sequence

Due to the definition of "random" it will be difficult to fullfill your requirements. The maximum frequency you can get will be the clock-frequency divided by two (when the output changes at two adjacent pulses). but there is no theoretical limit for the lowest frequency.

Bob

8 Replies
Esteemed Contributor II

## Re: Fixing low frequency of the PRS sequence

Due to the definition of "random" it will be difficult to fullfill your requirements. The maximum frequency you can get will be the clock-frequency divided by two (when the output changes at two adjacent pulses). but there is no theoretical limit for the lowest frequency.

Bob

Anonymous
Not applicable

## Re: Fixing low frequency of the PRS sequence

I love google !! The lowest frequency is going to be clock /Resolution and the highest logic frequency (not switching harmonics) is clock/2.  \m/

Esteemed Contributor II

## Re: Fixing low frequency of the PRS sequence

Yes, as I said Clock divided by two, but your low frequency of 100kHz will not be easy to reach, even with a resolution of 2 bits and a clock of 400kHz.

Bob

Anonymous
Not applicable

## Re: Fixing low frequency of the PRS sequence

or an input clock of 400kHz, maximum frequency from the PRS = 400kHz/2 = 200kHz.

And minimum frequency for resolution repeat cycle time 4 is 400kHz/4 = 100kHz. Correct ?

Esteemed Contributor II

## Re: Fixing low frequency of the PRS sequence

Yes, that is what I wanted to say. Since you may specify a resolution of 4, you'll get 15 different values (repeated) .

Bob

PS: I have been to Bakerstreet 221b

Anonymous
Not applicable

## Re: Fixing low frequency of the PRS sequence

Ha, I see. How did I miss you.

Anonymous
Not applicable

## Re: Fixing low frequency of the PRS sequence

Bob, could you provide me a much more discrete answer. What should I do to contain my frequencis between two known frequencies from a PRS component.

I can buy you a beer, if you could help me with this.

Esteemed Contributor II

## Re: Fixing low frequency of the PRS sequence

Well, as I red your last posts and with what I know about PRS I would...

to make a long story short, see attached project and have some measures.

Bob

Any beer is taken/given only personally.