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R7FA2L1 UART Recieve Data?

Hello,

I am experimenting with UART, I’m transferring data every 1 second in my application. When I connect the Rx and Tx pins there’s no trouble.
But when I cut the pin attachments. The data I send comes back to me in the form of an interruption. How can I fix this situation? What’s the reason for this situation?

Thanks

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