Power management

Habesh
Hi,
I need a help regarding power management.
I used to power my Board Micro2440 with 7inch LCD display using Battery.
I faced a problem, when my input voltage dropped lower than required -
flash gets corrupted and display goes white screen. I need to avoid this by
following power management IC or circuit.
Any ideas.
Please.

Marcelo
how you input the power of battery in a microcontroller?
thank you.