Howto clear Serial State change Interrupts

Hi,The Errata from August tells me that I have to enable the status change Interrupts for DCD,RI,DSR and CTS when using the NS9750 in UART mode. Unfortunately the manual doesn’t say how to clear these Interrupts. I suspect that I have to write a 1 to the corresponding bits DCDI,RII,DSRI and CTSI in the status register. Can anybody confirm this ? Jochen