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From: bame@hpfcbig.SDE.HP.COM (Paul Bame)
Newsgroups: sci.electronics
Subject: Re: MC6811EVB Question
Message-ID: <6560006@hpfcbig.SDE.HP.COM>
Date: 18 Jan 91 16:21:07 GMT
References: <1991Jan16.233027.5096@ux1.cso.uiuc.edu>
Organization: HP SESD, Fort Collins, CO
Lines: 17

> 	I am using the MC6811EVB for a project.  Upto now I have been using 
> Port C as an input, now I need to use it as an output.  It seems that although
> I have set the Data Direction Register for C to all outputs (1) the port stays
> as high Z inputs.  Any help with this matters would be apreciated.

I use the EVB "PortC" for output and have no difficulty (driving one
of those smart LCD modules) - it works as expected.  Just write 1 bits
to the DDRC (data-direction-register-C) where you want the bits to
be outputs and then write a value to PORTC.  Perhaps you could post
a code fragment which fails to drive the portC outputs, which bits(s)
you were testing electrically on portC and how.  I assume that you can
still use PORTC just fine for input which indicates the PRU and the
68HC11 startup mode are probably OK.


			-Paul "Spice is the Variety of Life"
			bame@hpfcbig.sde.hp.com	N0KCL