I am working with the LPC812. The microcontroller will be in Power Down mode and it needs to wake up every 5 minutes or on pin interrupt. The problem I have right now is that with the code I have, when there is a pin interrupt, it will also reset the 5 minutes timer.
I tried reading the LPC_WKT->COUNT register when waking up with the Pin interrupt, so I could restart the WKT timer with this value when going back in Power Down mode, but I always read 0.
How can I do that?