Currently I am working at the timer of a project. The goal is to set the LCD into sleep_mode_pwr_down from a certain set time and then countdown. It will display the remain time for a few seconds once push the button ( an interrupt ). So my question is how to keep the timer running while in sleep mode ? Any one can give me some hints or a link of similar project ?
From the code I have by now, it stops to countdown once the sleep mode starts.
Please give me as much suggestions as possible. Many thanks in advance.