Inverting binary word
Dr. Imre Bartfai email (remove spam text)
I hope this helps.
On Mon, 3 May 1999, Andreas Magnusson wrote:
> Hello all!
> I have a problem. I am programming a PIC. In the program I load a value from p
ortb to the register TANKOD. The value from portb tell me wich button that is pr
essed down on a keypad. If button 3 is pressed, 3 will be the value of portb.
> My problem is that the keypad use "negative logic" or something like that. A 0
is a 1 and a 1 is a 0. So i want to invert the register.
> 11111100 => 00000011
> Any Idea how I can do this in a easy way.
> Tnx /Andreas Magnusson
In reply to: <001001be95a2$cd3696e0$939f143e@a010010169>
See also: www.piclist.com/techref/index.htm?key=inverting+binary
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