At 11:28 PM 5/21/97 -0300, you wrote:
>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
>


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