Power down mode

How would one code SM2:are written to 011 to send system into powersaving mode. Also if I were to use a DS1307 would I be able to use Timer/ Counter2 along with it? Thank you very much

Quikksilver:
How would one code SM2:are written to 011 to send system into powersaving mode.

Whats an SM2 ?

Its the one of the sleep mode control registers. I dont know how to write to registers to activate powerdown mode.