Ways to generate interrupts

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Hi,

I am using a SoC which goes into sleep mode for 5 minutes. Now after 5 minutes I need to wake it up using some external trigger. What are the different ways I can implement interrupt generator in hardware?

I can not use timers of SoC, as SoC is in sleep and Timers are not operational in sleep mode.
I thought of RTC, counters or RC network.

Can any one suggest any other options?

Any other options in hardware which can generate periodic interrupt. :roll:

Thanks,
Archana.
 

You have already mentioned the relevant options. In addition, a watchdog or low power timer may be provided by the processor. If you want an exact timing, external RTC interrupt is probably the only reasonable method. I presume, you don't need to sleep the processor for exactly 5 minutes. If power saving is the objective, a sufficient low interrupt rate (e.g. 1 Hz) will have the same effect.
 

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