Psoc 4 Clock output and disabling Crystal

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Anonymous
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Hi

   

I am using the PSOC BLE Kit

   

Can anyone tell me if there is a delay between outputting a clock signal on the PSOC 4?

   

As I am reading the output of the 24MHz Crystal through a pin and its a little bit off.

   

Also can a anyone tell me if its possible to put the 24 MHz clock off while the PSOC is asleep to save power while keeping the UDB enabled?

   

 

   

Attached pic of Waveform. clock using divider 

   

Thanks 

   

Max Foster

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1 Solution
Anonymous
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Is this 24 MHZ clock from ECO or IMO?

   

If it is ECO, you can switch the CPU to IMO before you go to sleep and stop the ECO. Wnsure that you do not have BLE running at that time.

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Anonymous
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I found that the signal has a 5.425 nS rise and full time.

   

Is there a way of working out the exact clock speed?

   

 

   

Thanks

   

Max Foster 

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Anonymous
Not applicable

Is this 24 MHZ clock from ECO or IMO?

   

If it is ECO, you can switch the CPU to IMO before you go to sleep and stop the ECO. Wnsure that you do not have BLE running at that time.

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ETRO_SSN583
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Low Power ap notes that may be helpful -

   

 

   

http://www.cypress.com/documentation/application-notes/an86233-psoc-4-low-power-modes-and-power-redu...         AN86233 - PSoC® 4 Low-Power Modes and Power Reduction Techniques

   

http://www.cypress.com/documentation/application-notes/an90114-psoc-4000-family-low-power-system-des...                         AN90114 - PSoC® 4000 Family Low-Power System Design Techniques

   

http://www.cypress.com/documentation/application-notes/an92584-designing-low-power-and-estimating-ba...                          AN92584 - Designing for Low Power and Estimating Battery Life for BLE Applications

   

http://video.cypress.com/video-library/search/psoc+4+low+power/

   

 

   

With respect to timing, there is a summary report on Results tab, workspace explorer, but it

   

does not give you internal vs pin timing on a clock signal. Of course your timing is impacted

   

by externals, such as C loading, PCB routing delays, and currently there is no way of inputing

   

that to Creator timing analyzer. The timing file is xxxxx_timing.html

   

 

   

Regards, Dana.

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