Ext. Crystal Osc.; Frequency 3.0-8.0 MHz; Start-up time PWRDWN/RESET: 258 CK/14 CK + 4.1 ms; [CKSEL=1100 SUT=00]Boot Flash section size=256 words Boot start address=$3F00; [BOOTSZ=11]Preserve EEPROM memory through the Chip Erase cycle; [EESAVE=0]Serial program downloading (SPI) enabled; [SPIEN=0]Brown-out detection level at VCC=1.8 V; [BODLEVEL=110]
How to set the prescaler to divide the clock frequency from say 8mhz down to 1mhz, which is what I want to run at.
BTW - all i really want to do is get the thing running down to 2v or so and minimise power, so if i am overcomplicating please suggest alternative...maybe Arduino is not designed to do this?