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'[PIC]: WDT'
2000\12\05@120751 by imenez Yamasaki

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   Hi all:

   Is there any problem if a PIC is constantly reseted by a WDT (every 18
ms)?

   In other words, code runs for 18 ms, after that a reset is generated by
WDT and then code runs again...

   Does somebody know something about it?

   Thanks in advance,

   Gonzalo

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2000\12\06@195408 by Alice Campbell

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as far as i can tell, there is no problem from the hardware
side.  in fact, i have used WDT to measure temperature, and
letting it time out is the only way to do so.  still,  it
seems like an awkward way to end normal operation.

a.


{Quote hidden}

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'[PIC]: WDT'
2001\01\10@122045 by imenez Yamasaki
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   Some time ago I posted this, but without responses... ;)


  Hi all:

   Is there any problem if a PIC is constantly reseted by a WDT (every 18
ms)?

   In other words, code runs for 18 ms, after that a reset is generated by
WDT and then code runs again...

   Does somebody know something about it?

   Thanks in advance,

   Gonzalo

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2001\01\10@124527 by David VanHorn

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>
>
>     In other words, code runs for 18 ms, after that a reset is generated by
>WDT and then code runs again...
>
>     Does somebody know something about it?

It's not a "problem" unless that is not what should be happening.
That's up to you to determine, as the programmer.

The PIC dosen't care, it just does what you tell it to do.

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2001\01\10@125737 by imenez Yamasaki

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| >     In other words, code runs for 18 ms, after that a reset is generated
by
| >WDT and then code runs again...
| >
| >     Does somebody know something about it?
|
| It's not a "problem" unless that is not what should be happening.
| That's up to you to determine, as the programmer.

   In this case, I want it...

|
| The PIC dosen't care, it just does what you tell it to do.
|

   That4s why I like PICs :)

   I asked that question because I have a little board working in a very
noisy place, program is easy, just monitor some inputs and according to them
trigger some relays... well, because of the noise my PIC used to hung up...
so I decide to reset it every 18 ms using WDT, and my problem is gone...

   Gonzalo

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2001\01\10@131907 by David VanHorn

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>
>     I asked that question because I have a little board working in a very
>noisy place, program is easy, just monitor some inputs and according to them
>trigger some relays... well, because of the noise my PIC used to hung up...
>so I decide to reset it every 18 ms using WDT, and my problem is gone...

That would make me very nervous.
You need to chase down what's happening, not just mask it out.

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2001\01\10@132108 by Drew Vassallo

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>     Some time ago I posted this, but without responses... ;)

No, I remember this.  Plenty of people responded.

>     In other words, code runs for 18 ms, after that a reset is generated
>by
>WDT and then code runs again...

I believe the general consensus was that there was no problem with this,
except for the additional delays it would create in the code.  As long as
you're not doing anything with the WDT reset (i.e., changing registers), it
shouldn't disrupt any of your other code.

--Andrew
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2001\01\10@180322 by William Jacobs

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Gonzalo Jimenez Yamasaki:

       I do not think so.  I have a circuit using a 12c608 that interrupts
every 18 mS on the WDT.  I use it for timing that is not at all
critical.  The circuit has been running for about 16 months now.  The
power supply is 2 AA batteries  3 volt .  When the batteries go dead, I
will through it away.

bill jacobs


Gonzalo Jimenez Yamasaki wrote:
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