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n2het interrupt , iar ,halcogen

hello.

i have one question about n2het in rm48l950pge . 

i implement an UART by n2het , receiving  and sending work correctly  , when receive and send done interrupt created (by an instruction with irq=on) ,when interrupt enable and clear registers set  . => so i see interrupt flag is set when sending end . but where is routine interrupt for n2het ??? how can i handle it ??? 

thanks for your attention .