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For enabling the LVD interrupts you have to set the LVD level either from the device editor or from VLT_CR register. For enabling the interrupt you have to set the LSB of INT_MSK0 register. This bit is responsible for enabling the interrupts for LVD.
For revising the LVD ISR, you have to place a jump or a call instruction to the self defined ISR placed in assembly or C language. For placing the LJMP or CALL instruction you should modify the boot.tpl. Modifying the contents in boot.tpl will preserve the contents even when the project code is regenerated.
This is great! Thank you for your answer. It was just what I was looking for.
I have a battery operated application. I plan on using the LVD to flag weak or dead batteries.