Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Nuvoton/M05x_registers/FMC/ISPTRG#0x0
ISP Trigger Control Register
ISP start trigger Write 1 to start ISP operation and this bit will be cleared to 0 by hardware automatically when ISP operation is finish.
1 = ISP is on going
0 = ISP done
https://github.com/cmsis-svd/cmsis-svd-data