I want to know why I can't get into the interrupt handler. [R7FA6E10F - SCI0 - Smart Card Interface]

I am new to R7FA6E10F. I am developing a program to communicate with a smartcard via SCI0 interface,
It works fine until I start receiving the ATR (0x3B, ...) values sent by the smartcard into the RDR register,
sci_smartcard_rxi_isr() doesn't seem to be called.

When I check the ICU Interrupt, it comes up as Pending, but the breakpoint is not working inside sci_smartcard_rxi_isr().

I'm wondering if there are any other settings I need to make besides the ones I attached.

We share the details in the article below. Thanks