whether need to configure any register to use internal schmitt trigger?
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Priyanka,
Please see section 12.2 of the reference guide below. The IO can be set as input direction using PxDIR and pull up or pull down can be enabled using PxREN.
https://www.ti.com/lit/ug/slau208q/slau208q.pdf
You can also see the IO diagrams in section 9.10 of the datasheet.
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