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'[PIC] 16f84a vs 16f628a'
2006\09\04@083329 by Renzo

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I have a circuit, mainly a counter, with Led display driven by a
16F84a that runs perfectly.
I changed the chip with a 16F628A , no change in the circuit I only
replaced in the program the RAM beginning with 20h instead of 0Ch and
of course processor and include file..
Now to start I have to momentary ground Rb0 and Rb4 never change.

There are any other replacement to do? There is some article that
deal with this problem?
Thanks
Renzo Giurini

2006\09\04@085247 by Alan B. Pearce

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>Now to start I have to momentary ground Rb0 and Rb4 never change.
>
>There are any other replacement to do? There is some article that
>deal with this problem?

Sounds like you haven't disabled the analogue inputs.

2006\09\04@090141 by Bob Axtell

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Renzo wrote:
> I have a circuit, mainly a counter, with Led display driven by a
> 16F84a that runs perfectly.
> I changed the chip with a 16F628A , no change in the circuit I only
> replaced in the program the RAM beginning with 20h instead of 0Ch and
> of course processor and include file..
> Now to start I have to momentary ground Rb0 and Rb4 never change.
>
> There are any other replacement to do? There is some article that
> deal with this problem?
> Thanks
> Renzo Giurini
>
>  
There are a few other changes, too. Look at the Microchip Spec sheet for
the PIC16F628A.
At the very least, CMCON will have to be loaded with 7 to turn off the
analog comparators,
and enable digital signal operation.

--Bob

2006\09\04@114536 by Tamas Rudnai

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If you change chips often it may be a good idea to use macros for the chip
specific things (like initializing the PIC, or using ports or other
peripheries).

Tamas


On 04/09/06, Bob Axtell <spam_OUTengineerTakeThisOuTspamneomailbox.com> wrote:
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> -

2006\09\04@120458 by john

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How do you  set cmcon if you still want to use one (or 2) of the analog
comparators, but require the rest digital, or is there another way to
set this?

Regards

John

Bob Axtell wrote:

{Quote hidden}

2006\09\04@122219 by Bob Axtell

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You need to follow the instructions in the datasheet. You can do exactly
what you mentioned, and more.

--Bob

john wrote:
{Quote hidden}

2006\09\04@122328 by Tamas Rudnai

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You set up the the port if analog or digital by ANSEL -- you can set which
port is analog and which is digital.

Tamas


On 04/09/06, john <.....johnKILLspamspam@spam@raystorm.co.uk> wrote:
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> -

2006\09\04@153404 by Renzo

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At 18.23 04/09/06, "Tamas Rudnai" <tamas.rudnaispamKILLspamgmail.com>  wrote:
>You set up the the port if analog or digital by ANSEL -- you can set which
>port is analog and which is digital.
Excuse me but ANSEL what is?

In any case the whole PORTB is used as output.

Renzo



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2006\09\06@061309 by Marco Genovesi

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Renzo,
some differences between 16F84 and 16F628 are descibed also in this tutorial:

http://www.amqrp.org/elmer160/lessons/index.html


--> (see page 9 of APPENDIX "A")


ciao
Marco


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>From      : EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu
To          : piclistspamspam_OUTmit.edu
Cc          :
Date      : Mon, 04 Sep 2006 14:31:59 +0200
Subject : [PIC] 16f84a vs 16f628a







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> --

2006\09\06@080240 by Byron A Jeff

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On Wed, Sep 06, 2006 at 12:12:46PM +0200, Marco Genovesi wrote:
>
> Renzo,
> some differences between 16F84 and 16F628 are descibed also in this tutorial:
>
> http://www.amqrp.org/elmer160/lessons/index.html

I also have my 16F628 and 16F84 comparison page:

http://www.finitesite.com/d3jsys/16F628.html

BAJ

2006\09\06@091602 by John J. McDonough

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Date: Wed,  6 Sep 2006 12:12:46 +0200
From: "Marco Genovesi" <@spam@marco.genovesiKILLspamspamlibero.it>

> some differences between 16F84 and 16F628 are
> descibed also in this tutorial:

Thanks for the plug, Marco!

--McD

2006\09\06@100429 by Marco Genovesi

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>> Thanks for the plug, Marco!
>
> --McD


..oh, no problem, I'm obliged!  It was one of the first tutorial that I used to learn PIC programming! (one of the most comprehensible, IMHO..)


regards
Marco




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2006\09\06@135149 by Renzo

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Marco,
thanks, very interesting

salve
renzo

At 12.12 06/09/06, you wrote:


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