Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Nuvoton/M05x_registers/INT/IRQ15_SRC#0x0
MCU IRQ15 (SPI1) interrupt source identify
Bit2 = 0 Bit1 = 0 Bit0: SPI1_INT
https://github.com/cmsis-svd/cmsis-svd-data