I/O Problem

ElectroNick · Joined: 10 Oct 2005 Posts: 4

Hello,

I'm trying to use PIC16F946, when I define ports as input that's ok, it works. But when I define ports as output that goes high automatically, I try to clear and change it in software but no way, output is always high! Previously I used 16f628, 16f785 etc. without problem. But i can't do it at this time. I also disable LCD module and A/D module like this:

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

You need to post a test program that shows the problem. We need
to know what ports you are using when the problem occurs.

ElectroNick · Joined: 10 Oct 2005 Posts: 4

This is my test program, but that doesn't work:

Einstein · Guest

I have the same problem with Ports F and G.

After controlling the generated ASM code from the compiler,
I noticed that the TRIS Register definition of Port F and G was
understood wrong from the compiler. He locates these ports into
register 0xA and 0xB, that is used by PCLATH and INTCON.

I tested it, written the TRIS definition in asm and it works.

I am still trying to understand where to change the memory location/definiton for this device in the compiler.

regards,
AE

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

You can write directly to the TRISF and TRISG registers in the 16F946
by using the following method:

Einstein · Guest

I updated by compiler version to 3.249 and the problem was resolved.

THX,

AE