Is this an error from CCS?

chen · Joined: 03 Mar 2004 Posts: 11

I define
#bit GRNLED_SEL = PORTF.2
#bit MMCPOWERE = TRISF.3
#bit MMCPOWER = LATF.3

When I assign GRNLED_SEL=1, it affects the state of MMCPOWER.

chen · Joined: 03 Mar 2004 Posts: 11

BTW, I am using PIC18F8620 with CCSC 3.212

and I initialize MMCPOWERE =0

dyeatman · Joined: 06 Sep 2003 Posts: 1923 Location: Norman, OK

It would be nice to see ALL of your initialization/setup source code which includes showing the include file(s) you are using.

Also post the portion of the LISTing file around the instructions you posted so we can see what the compiler is doing.

Trampas · Joined: 04 Sep 2004 Posts: 89 Location: NC

Also read about the fast I/O if the fast I/O is not selected then setting a port's bit might change the Tris register.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

You're probably having a RMW problem. Try doing all operations
on the latch, instead of the port. That should eliminate the problem.
Change the definition of the Green LED bit to use the Latch. Example:
#bit GRNLED_SEL = LATF.2

See this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=19130

Also read the Microchip Reference manual on the i/o ports for 18F PICs:
http://ww1.microchip.com/downloads/en/DeviceDoc/39511.pdf

chen · Joined: 03 Mar 2004 Posts: 11

Thanks, I will follow your suggestions