If you have a RTC you may be able to configure one of its pins for a 1Hz o/p.
This can be attached to an interrupt pin. You can then incorporate a sleep mode, saving power.
This is of course if your application doesn't need constant processing.
If you have a RTC you may be able to configure one of its pins for a 1Hz o/p.
This can be attached to an interrupt pin. You can then incorporate a sleep mode, saving power.
This is of course if your application doesn't need constant processing.