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'[PIC]: PIC hangs up ?'
2001\09\26@035139 by Ivan Cenov

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Hello everybody,

Is it possible such occasion:
The oscillator (20MHz) works, but the PIC CPU in the same time
does not work (does not execute instructions). Is it possible
this to happen par example after some external event ?

Ivan Cenov
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http://www.geocities.com/i_cenov/

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2001\09\26@184756 by Tony Nixon

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Ivan Cenov wrote:
>
> Hello everybody,
>
> Is it possible such occasion:
> The oscillator (20MHz) works, but the PIC CPU in the same time
> does not work (does not execute instructions). Is it possible
> this to happen par example after some external event ?


Is MCLR tied to 5V?

If a 16F87x chip or 16F62x chip, is LVP enabled and the RB3 or RB4 bit
tied low?

If a 16F87x chip, is debug enabled?

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Tony

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2001\09\26@214654 by Kevin Olalde

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> If a 16F87x chip or 16F62x chip, is LVP enabled and the RB3 or RB4 bit
> tied low?

On a '628, I've found I don't need to pull it low if I turn off LVP (but it
looks like one needs to use HVP to turn it back on).

Still learning, does that sound correct?

Kevin

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2001\09\26@220817 by Tony Nixon

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Kevin Olalde wrote:
>
> > If a 16F87x chip or 16F62x chip, is LVP enabled and the RB3 or RB4 bit
> > tied low?
>
> On a '628, I've found I don't need to pull it low if I turn off LVP (but it
> looks like one needs to use HVP to turn it back on).
>
> Still learning, does that sound correct?

Yes, RB4 only needs to be pulled low if LVP is enabled, otherwise it is
used as an IO pin.

If you are using the 16F62x chip, did you disable the comparator?

Probably more silly...but...what exactly is your code doing after it
starts up. It could be locked up in a permanent loop somehow.

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2001\09\27@013949 by Ivan Cenov

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It is 16F876. I discovered that I call function from ISR
that does CLRWDT. Then the chip began to reset from time to time.
Disturbances may be... make the PC to jump somewhere?
Not SW problem.

Thanks a lot.

Ivan

{Original Message removed}

2001\09\27@015357 by Tony Nixon

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Ivan Cenov wrote:
>
> It is 16F876. I discovered that I call function from ISR
> that does CLRWDT. Then the chip began to reset from time to time.
> Disturbances may be... make the PC to jump somewhere?
> Not SW problem.
>
> Thanks a lot.
>
> Ivan

Perhaps the WDT is not being reset often enough.

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