I want uart initilization without fifo when I go through data sheet we have make FIFO Rx and Tx size zero and after that I am enabling Receive Interrput Enable in CCR .RIEN

when I fire data from from Dock light the interrupt is not hitting. but when I use FIFO RBCTR.RIEN then the interrupt is hitting . which register can I modify to disable FIFO

and made Receive Interrupt avilable.