AVR-Chat

PC2-5 are the JTAG port.  You need to disable that feature in the fuse
settings (programmer, fuse page) to enable those bits as normal i/o bits.

Cheers!

-----Original Message-----
From: Dave VanHorn [mailto:dvanhorn@cedar.net]
Sent: Sunday, January 11, 2004 8:44 AM
To: AVR-Chat@yahoogroups.com; AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] PortC problem


At 11:36 AM 1/11/2004 -0500, Dave and Connie wrote:
>My son is trying to use a Mega16 to drive LEDs on PortC using Bascom.  Bits
>0,1,6,7 work but 2,3,4,5 do not.  The port is set up with Config Portc =
>output.  The same code works on PortA but he does not want to use that port
>as it is the A/D converters.  The LED code will eventually become stepper
>code.  He has tried the code on two chips with the same result.

Have you tried replacing the chip?

It's odd that only the end bits are working.
I don't have a M16 sheet handy, but the M128 lists only address for SRAM as
alternate functions for port c.

Alternatively, maybe the byte being output is being masked or otherwise
corrupted somewhere?





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