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PSoC™ 4 Forum Discussions

lola_1650581
Level 3
Level 3
First like received

Hi all:

 About the smart IO configuration for external oscillator drive circuit for CY8C4146AZI-S433 ,I have some  questions to ask:

1:what's the R95 used for?

   pastedImage_1.png

2:How can I configure the  frequency of the external clock?

3:Is CRY_IN ,CRY_OUT and EXTCLK pin must  arranged to P26 ,P27 and P06?

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1 Solution
Anonymous
Not applicable

Hi,

Sorry, I misunderstood your question. Here are the answers-

1. What's the R95 used for?

   I talked to the author. R95 is just a jumper. You can wire it directly to the external clock input pin P0.6.

2. How can I configure the  frequency of the external clock?

     Some tuning might be required. Here is the useful source of information - https://www.edn.com/design/sensors/4429819/1/Crystal-Oscillator-Fundamentals-and-Operation-Part-II

3. Is CRY_IN ,CRY_OUT and EXTCLK pin must  arranged to P26 ,P27 and P06?

     Yes, that is correct.

- Rajiv

View solution in original post

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4 Replies
lola_1650581
Level 3
Level 3
First like received

Hi all:

  Is there anyone can help?

  Thanks.

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Anonymous
Not applicable

Hi,

1. R95 is directly across a short. Something is wrong here. Can you please point to the source location of the diagram?

2. External clock can be fed directly instead of a crystal as a source of low frequency clock. Please refer this KBA to know how to use external clock - External Oscillator for WCO of PSoC® 4/ PRoC™ BLE - KBA200299

Are you referring to the external clock which replaces internal IMO?

3. For the selected device, crystal pins are wco_in - P0[4], wco_out - P0[5]

-Rajiv

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Hi Rajiv:

    Thanks.

    1.The source location of the diagram is show in the accessory.

    2.Yes,I want to use the external clock which replaces internal IMO.

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Anonymous
Not applicable

Hi,

Sorry, I misunderstood your question. Here are the answers-

1. What's the R95 used for?

   I talked to the author. R95 is just a jumper. You can wire it directly to the external clock input pin P0.6.

2. How can I configure the  frequency of the external clock?

     Some tuning might be required. Here is the useful source of information - https://www.edn.com/design/sensors/4429819/1/Crystal-Oscillator-Fundamentals-and-Operation-Part-II

3. Is CRY_IN ,CRY_OUT and EXTCLK pin must  arranged to P26 ,P27 and P06?

     Yes, that is correct.

- Rajiv

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