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PICList Thread
'How to manually reset the PIC16F84'
1998\01\15@183217 by Peter Homann

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Hi all,

I don't have the data specs for the PIC16F84 and I understand it has
some improvements in the brown out and reset circuitry.

I'm building a project where I want to manually reset the processor.
Additionally, the circuit is being powered from a regulated 5V power
supply, so I don't think brownout is a problem.

Can somebody confirm if I can connect the MCLR pin to GND via a momentry
push button switch to reset the processor, or the appropriate circuitry
required to do this.

Thanks again,

Peter.
--
Peter Homann   email: spam_OUTpeterhTakeThisOuTspamadacel.com.au       Work : +61 3 9596-2991
Adacel Technologies Ltd                          Fax  : +61 3 9596-2960
250 Bay St, Brighton 3186, VIC, AUSTRALIA      Mobile :     014 025-925
http://www.adacel.com.au     Australian Software Engineering Excellence

1998\01\15@185255 by Andrew Warren

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Peter Homann <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU> wrote:

> Can somebody confirm if I can connect the MCLR pin to GND via a
> momentry push button switch to reset the processor

Peter:

Yeah, that'll work fine... Although if you already have MCLR wired
to Vdd in your circuit, you should make sure that that connection is
through a resistor.

-Andy

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

1998\01\15@192456 by Peter Homann

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Andrew Warren wrote:

> Peter Homann <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU> wrote:
>
> > Can somebody confirm if I can connect the MCLR pin to GND via a
> > momentry push button switch to reset the processor
>
> Peter:
>
> Yeah, that'll work fine... Although if you already have MCLR wired
> to Vdd in your circuit, you should make sure that that connection is
> through a resistor.

> -Andy

Thanks Andy. From what you have said, can presume there is no internal
pullup on the MCLR line?

Peter.
--
Peter Homann   email: EraseMEpeterhspam_OUTspamTakeThisOuTadacel.com.au       Work : +61 3 9596-2991
Adacel Technologies Ltd                          Fax  : +61 3 9596-2960
250 Bay St, Brighton 3186, VIC, AUSTRALIA      Mobile :     014 025-925
http://www.adacel.com.au     Australian Software Engineering Excellence

1998\01\15@193920 by Andrew Warren

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Peter Homann <PICLISTspamspam_OUTMITVMA.MIT.EDU> wrote:

> can presume there is no internal pullup on the MCLR line?

Peter:

Yes, you can presume that... You should ALWAYS pull MCLR to Vdd;
leaving MCLR unconnected can cause all sorts of bizarre problems.

-Andy

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

1998\01\15@213905 by Peter Homann

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Andrew Warren wrote:

> Peter Homann <KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU> wrote:
>
> > can presume there is no internal pullup on the MCLR line?
>
> Peter:
>
> Yes, you can presume that... You should ALWAYS pull MCLR to Vdd;
> leaving MCLR unconnected can cause all sorts of bizarre problems.
>
> -Andy

Thanks again Andy,

Peter.
--
Peter Homann   email: RemoveMEpeterhTakeThisOuTspamadacel.com.au       Work : +61 3 9596-2991
Adacel Technologies Ltd                          Fax  : +61 3 9596-2960
250 Bay St, Brighton 3186, VIC, AUSTRALIA      Mobile :     014 025-925
http://www.adacel.com.au     Australian Software Engineering Excellence

1998\01\16@012128 by Mike Keitz

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On Fri, 16 Jan 1998 11:25:32 +1100 Peter Homann <spamBeGonepeterhspamBeGonespamADACEL.COM.AU>
writes:

>Thanks Andy. From what you have said, can presume there is no internal
>pullup on the MCLR line?

A few of the newer PICs may have it or an option for it but most
(including F84) don't, so a resistor to Vdd is required.  Microchip may
have been thinking that some applications would save power by holding
MCLR low, stopping the PIC completely. (Does this also stop the WDT,
saving additional power over using the sleep mode?)  If a pull-up were on
the MCLR line it would waste power in this case.

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