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IWDT not working


I'm using Ra6m1 MCU

I have 2 partition:

1. Bootloader partition: from 0x00000000 to 0x00010000 flash memory

2. Application partition : from 0x00010000 to 0x00080000

Problem: I want to use IWDT at Application partition, i have start iwdt at OFS0, but it not work.

However, if I change flash address of Application partition to 0x00000000 , IWDT work normally.

I thinks problem relates to option-setting memory location on flash. When i set start address at 0x00010000  (which is different from initital address 0x00000000  ) => option-setting memory address will start from 0x00010400  (arcording to "Renesas RA6M1 Group User's Manual: Hardware") , but system may only reads 0x00000400   so it keep iwdt disable.

So how can i solve this problem?