> ----------
> From: Morgan Olsson[SMTP:
spam_OUTmrtTakeThisOuT
INAME.COM]
> Reply To: pic microcontroller discussion list
> Sent: Monday, January 26, 1998 5:09 AM
> To:
.....PICLISTKILLspam
@spam@MITVMA.MIT.EDU
> Subject: Re: mclr on pic16f84
>
> If it don«t help tying MCLR to Vdd there is probably severe noise in
> chip
> supply.
>
> 1) Are you certain that ni spikes etv are conming in return fron
> outputs,
> or overshooting the inputs? Maybe try inserting resistors close to
> chip in
> serial to the suspected pins?
>
> 2) Are the PIC supply stable and well decoupled?
>
> 3) Or, I dare say, there is a program error. We all do them... Have
> you
> made a very simple test progran that make all output operations, and
> detect
> reset?
>
> PS We are all interested on avoiding problems of this kind, so please
> tell
> if You find anything! DS
>
> Regards
> /Morgan
>
> At 22:46 1998-01-25 -0800, you wrote:
> >hello
> >
> >I am working on a project that involves controlling electric motors
> >through relays with a PIC16F84. The motors and relays have the
> >appropriate back EMF suppression circuits, but I find that the PIC
> >occasionally resets when the motor and/or relay swithes on/off. I
> suspect
> >that this has something to do with the MCLR pin on the PIC.
> >
> >Can anybody advise a way of making the pic resistant to this type of
> >resetting, or possibly disabling the mclr pin?
> >
> >Any assistance that you could give would be most appreciated.
> >
> >Mark
> >
> >
>
> Morgan Olsson, MORGANS REGLERTEKNIK, Sweden, ph: +46 (0)414 70741; fax
> 70331
> ======================================================================
> ======
>