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Questions of TL16C550D (Unexpected interrupts occure)

Hello,

I used TL16C550DIZQS, BGA Package type for UART communication.

In ZQS package, It doesn't have /RI, /DCD, /DSR pin but sometimes it make interrupts from DSR, RI, DCD.

When Interrupts occure from DSR, RI, DCD, it doesn't work, so I disabled Modem status Interrupt, it works well.

Why interrups occure from inexistence pins?

Thanks.