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'Port E query'
1998\01\17@152251 by Philip Martin

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Wonder if any can help with this problem?

Is there any thing strange about port E on a 16C64, pull ups or anything
like that.

Ive got a load of code running in one and on MPLAB the port works fine,
outputting on each pin as required by the code. But on the board I am
getting pins going high when they should not, at this exact point in
the code, on MPLAB they dont?

Any one got any thoughts. Ive checked the data sheet but that doesn't
seem to say anything about pull ups or the like.

TIA
--
Philip Martin   ----------------------------------------------------------------
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email spam_OUTphilipTakeThisOuTspamphilmart.demon.co.uk

1998\01\17@191942 by Andrew Warren

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Philip Martin <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU> wrote:

> Is there any thing strange about port E on a 16C64, pull ups or
> anything like that.
> ....
> I am getting pins going high when they should not

Philip:

On the 16C64, Port E can be configured to be the control lines for
the Parallel Slave Port... In fact, that's the default configuration
for those pins.

To disable the Parallel Slave Port, set bit 4 of TRISE.

-Andy

=== Andrew Warren - fastfwdspamKILLspamix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499

1998\01\18@045957 by tjaart

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Philip Martin wrote:
>
>  Wonder if any can help with this problem?
>
> Is there any thing strange about port E on a 16C64, pull ups or anything
> like that.
>
> Ive got a load of code running in one and on MPLAB the port works fine,
> outputting on each pin as required by the code. But on the board I am
> getting pins going high when they should not, at this exact point in
> the code, on MPLAB they dont?
>
> Any one got any thoughts. Ive checked the data sheet but that doesn't
> seem to say anything about pull ups or the like.

Make sure your TRISE.4 is not set for PSP mode. I've also stepped in
this one before...

--
Friendly Regards

Tjaart van der Walt
.....tjaartKILLspamspam.....wasp.co.za
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