How to increase watch dog timer interval ?

[jamec_2673086]

I want to increase MCU deep sleep interval. MCU wakeup will be done by watch dog timer.But with watch dog timer0 & timer1 i can achieve up to 2 secs.But requirement is more than 2 sec So i found a way is cascading two timers.One will act as period counter & another will act as prescaler .But i dont know how implement this using Watchdog API.

Another way is to decrease clock but same for clock how to reduce it for WDT?

Is there any other possible way ?

[Bob_Marlowe]

Usual method is to have a counter that is decreased at wakeup and when not yet zero go to deep sleep again. This will not consume much power.

Bob

[jamec_2673086]

But It is the Alternative way.

Here APIs are given for cascade but how to do cascade is not given Or Explained .