[picsig] Help needed with MCLR reset

[Andrew Rich]

Lee,

My name is Andrew.

The LCD is fine and happy to a power up. You can sit there all day and turn 
the whole cct on and off.

But when you just reset the PIC it does not always come back the same as a 
power cycle.



----------------------------------------------------------------------
Andrew Rich (VK4TEC)





>From: "Lee De Vries" <LDEVRIES at gordontafe.edu.au>
>Reply-To: TAPR PIC Mailing List <picsig at lists.tapr.org>
>To: "TAPR PIC Mailing List" <picsig at lists.tapr.org>
>Subject: RE: [picsig] Help needed with MCLR reset
>Date: Thu, 22 Jul 2004 13:23:08 +1000
>
>
>Hi Rich,
>
>Have to go to class now, but I think I understand your problem.  LCD's are 
>tricky to reset & there was a error in the initial Hitachi data sheet.  
>They are temperature sensitive & if you don't get it right, then it will 
>behave as if the CPU is not resetting.  Been there done that. Get back to 
>you.
>
>
>Lee
>
>
>-----Original Message-----
>From: Andrew Rich [mailto:vk4tec at hotmail.com]
>Sent: Thursday, 22 July 2004 11:28 AM
>To: picsig at lists.tapr.org
>Subject: RE: [picsig] Help needed with MCLR reset
>
>
>Thanks Lee,
>
>I am using an LCD.
>
>I have to hold the MCLR down for one to two seconds to get the thing to
>clean reset, but does not all the time work.
>
>Sometimes the LCD goes nuts. and the system does not restore properley .
>
>I found out about the RAM staying put yesteday, and I am looking into if
>this is casuing me hassles.
>
>Thanks !
>
>
>
>----------------------------------------------------------------------
>Andrew Rich (VK4TEC)
>
>
>
>
>
> >From: "Lee De Vries" <LDEVRIES at gordontafe.edu.au>
> >Reply-To: TAPR PIC Mailing List <picsig at lists.tapr.org>
> >To: "TAPR PIC Mailing List" <picsig at lists.tapr.org>
> >Subject: RE: [picsig] Help needed with MCLR reset
> >Date: Thu, 22 Jul 2004 09:55:47 +1000
> >
> >
> >Hi,
> >
> >I am not sure what you mean by a "clean reset" as opposed to perhaps a
> >"non-clean reset".
> >
> >If you mean that all file registers are reset to 0x00, I think a power 
>down
> >is required ( for perhaps a few seconds) will be required.
> >
> >Resetting it with MCLR, will obviouslt reset PC and probably most FSR's 
>but
> >not RAM.
> >
> >I have never had a problem with resets and have now used 100's of PICs in
> >about 40 designs that I have done.
> >
> >Perhaps a 10uF Tantalum to ground will ensure that /MCLR stays low for
> >sufficient time to reset properly.
> >
> >Lee VK3PK
> >
> >
> >
> >-----Original Message-----
> >From: David VanHorn [mailto:dvanhorn at cedar.net]
> >Sent: Wednesday, 21 July 2004 11:05 PM
> >To: TAPR PIC Mailing List; Andrew, VK4BAB; vk4khp; TAPR PIC Development
> >Special Interest Group
> >Subject: Re: [picsig] Help needed with MCLR reset
> >
> >
> >At 05:48 PM 7/19/2004 +1000, Andrew Rich wrote:
> >
> > >Howdy,
> > >
> > >Having problems getting the PIC to clean reset.
> > >
> > >I have MCLR enabled and held high with a 10k resistor. I sink it to gnd
> > >using a button.
> > >
> > >Ideas ? Seems to lock up and not reset well
> >
> >1: not much pullup, 4.7k would be safer, or even 1k.
> >2: contact bounce. Add a 0.1uF cap across the switch, located at the 
>micro.
> >3: EMI/ESD pickup on the wire, add 100-1kohm in series with the lead to 
>the
> >switch.
> >
> >
> >_______________________________________________
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> >picsig at lists.tapr.org
> >https://lists.tapr.org/cgi-bin/mailman/listinfo/picsig
> >
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