I need some help choosing some components for my application.

Power will be supplied by automotive battery (12V - car or motorcycle) =
AND a 9v battery. Logically, when 12v battery is connected, I don't need =
to draw energy from the 9v battery.

I've seen a few (quite a few) models from national semi., ti and seiko, =
but I'm now sure if only one regulator will do the job or what kind of =
switching (between the 9v and 12v bats) components do I need to =
consider? The desired output voltage is 3.3 (I'm using the "LF" series =
of PICs)

Thanks

Padu
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