First time with PIC, first strike

[striker2509]

Sorry to ask something this easy for someone who really knows. im trying to read from PORTB, put that value in PORTC and activate an enable bit of a demux....how can i do this?. Im trying to put the value of PORTC into W, and the PIC there is no output at all.

Hope u can help me. sorry again

 

[Nigel Goodwin]

Sorry to ask something this easy for someone who really knows. im trying to read from PORTB, put that value in PORTC and activate an enable bit of a demux....how can i do this?. Im trying to put the value of PORTC into W, and the PIC there is no output at all.

Hope u can help me. sorry again

I'm not very clear at all what you're trying to do?, you refer to full ports, then mention a single bit? - are you wanting to access the single bit?, or the full port? - the commands are both very simple, but both totally different.

Assuming you want to copy the full contents of portB to portc (which is what it sounds like? - although it doesn't make much sense?), you do it like this:

movf PortB, w
movwf PortC

As easy as that!. Obviously the ports must be set correctly, this is done in the TRIS registers.

 

[striker2509]

make myself clear!

Hi again, what im trying to do its a way to control 20 74ls154 (4-16 line demux) with a PIC16F877 . To control all the IC's, i need to switch the enable pin of each Demux. if i set an enable, n that moment, the 4 bits data must go through the demux and activate a biestate (latch) connected to the demux output. Did i make myself clear?

Thank you again... See ya