Digital circuit question

[BertMan]

I am interfacing a pic microcontroller with an electronic compass module via spi interface. The problem is the pic outputs at 5v and the compass will only handle 3v. I am thinking voltage divider for any inputs to the compass and an opamp for outputs. What is the best way to drop and increase voltage in digital circuits?

[ed84c]

A D.Pair or comparator like you said.