I tried to use timer1 for 30s time out. When timer1 time out, in timer1 interrupt handler, I disable timer1 and start timer0 for 1 minute timeout, then put system in power mode3. When timer0 time out, in timer0 interrupt handler, I disable timer0 and start external interrupt 4, then put system in power mode4.
Is it possible to manage the system like this? Because I tried several times, it does not work.
Any ideas about this or suggestion how can I do this?