RX130 - IWDT Interrupt does not occur

Hello, 

I'm using microcontroller of Renesas family RX130. I implemented the IWDT using the Renesas Smart Configurator.

These are my settings:

My problem is that the non-maskable interrupt ( r_Config_IWDT_nmi_interrupt() ) does not occur when I stop refreshing the watch-dog. I don't see where this is wrong.

This is the auto-generated code for the IWDT initialization:

Does anyone have an idea?

Thanks!