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PICList Thread
'Can I use a '54RC with a XT oscillator?'
1997\05\21@224213 by rlando de Andrade Figueiredo

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Hi all!


We have a little application with a PIC 16C54A and a 3.58MHz
ceramic ressonator. It works fine. But the Microchip distri-
butor in Brazil don't have stock of that component and sent
us a PIC16C54RC. They said that we can program it with the XT
option without problems.

Well, we didn't have choices, we made it, but there was a pro-
blem. At a certain point of program, we use a sleep instruction
with wake-up by watchdog (and pre-escaler=~1,2s). With the '54RC,
the oscillator don't stop. After some tests, we suspect that
the watchdog time-out is very fast and we can't see the stop
in the oscilloscope.

My question is: Can I use a 54RC with XT oscillator? Did someone
make it?

TIA,

Orlando de Andrade Figueiredo
Salvador - Brasil

1997\05\22@065818 by Andy Kunz

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>We have a little application with a PIC 16C54A and a 3.58MHz
>ceramic ressonator. It works fine. But the Microchip distri-
>butor in Brazil don't have stock of that component and sent
>us a PIC16C54RC. They said that we can program it with the XT
>option without problems.

You don't tell which programmer you are using, but you need to set the two
bits fuses to enable XT operation.  Because they are EPROM and the RC value
is "11" binary, it is possible to burn them to the appropriate values for
XT operation.

>My question is: Can I use a 54RC with XT oscillator? Did someone
>make it?

Many people use this because RC parts are cheaper than XT, HS, or LP.  It
works perfectly.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\05\22@094252 by Jim Robertson

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At 11:28 PM 5/21/97 -0300, you wrote:
{Quote hidden}

Parallax used 16C55RC with a 3.58MHz ceramic resonator in their PIC
programmer. Don't know how successful it was. Seems like penny pinching to me.

Jim Robertson

1997\05\22@100553 by Andy Kunz

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Jim,

My Parallax programmer has 4.00 MHz resonator.

The long and short of it is:

For non-production or non-critical applications up to about 4MHz (5MHz
works) you can get away with using an RC in place of an XT.

Andy

======================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 USA
             Electronics for Industry & R/C Hobbyists
        "Go fast, turn right, and keep the wet side down!"
======================================================================

1997\05\22@215421 by Craig R. Autio

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SNIP
> >My question is: Can I use a 54RC with XT oscillator? Did someone
> >make it?
> >
>
>
> Parallax used 16C55RC with a 3.58MHz ceramic resonator in their PIC
> programmer. Don't know how successful it was. Seems like penny pinching
to me.

Sure you can do this.  The RC parts do not have the oscillator tested.  I
have seen products that have this configuration.  There is NO GUARANTEE of
operation at the temperature and voltage specifications.  I have been faced
with this decision in the past and in the best interest of the company, I
elected for XT parts.  It is not worth the risk of a poor reputation should
failures occur.

Craig R. Autio
spam_OUTcautioTakeThisOuTspamequinox.shaysnet.com

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