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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

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

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JoMe_264151
Expert II

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 

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8 Replies
JoMe_264151
Expert II

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 

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Anonymous
Not applicable

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

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JoMe_264151
Expert II

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

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 ?

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JoMe_264151
Expert II

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

Ha, I see. How did I miss you.

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Anonymous
Not applicable

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.

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JoMe_264151
Expert II

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.

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