Setting known state in an 8-bit register.

[stevekos]

Good afternoon.

This is a silly question, but I can't seem to figure out how to
set a bit in a register LOW in C. I know how to do it in assembly,
but for some reason I can't do it in C.

Let me give you an example:

I have a 8 position DIP switch on PORTB. I want to ignore RB6 and RB7
but get the values of the other 6 positions. So I am reading in portb into
a shadow register and I want to set RB6 and RB7 LOW.

I am drawing a blank, and I searched for this but something tells me it is
so simple that I am the only person "that doesn't get it" ...

Thanks in advance.

Steve

[Humberto]