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We recommend you to use a 32.768kHz crystal for WCO.
In order to connect the WCO to the device please follow the recommendations as shown in the image below:
In order to trim IMO using WCO you can just enable the Trim with WCO option. The steps to do this are as followed:
- In the workspace explorer go to the design wide resources.
- Select the clock tabs
- Click on edit clocks
- Enable the WCO under low frequency clocks tab of configure system clocks dialogue box, as shown in the image below:
- Under the high frequency clocks tab, enable trim with WCO option for IMO.
The IMO will now be trimmed by WCO. This is reflected in the accuracy of IMO.
Thanks for your answer.