Lpc2000

Jaya,

I forwarded your question to the author of the FAQ because I do not 
know the answer out of own experience. The Application Note makes 
the clear statement that it is a general ARM7TDMI - VIC problem.
For those interested in the detailled application note that 
describes how to handle spurious interrupts:
http://www.standardics.philips.com/support/documents/microcontrollers
/pdf/an10414.pdf

We would however greatly appreciate if you would provide your 
knowledge by investigating competitor devices using the VIC and 
telling this community if this is not a general ARM VIC as stated in 
the Application Note by running the same code on a competitor device 
not showing the problem and on a LPC2000 device, showing the issue.

We do experience the problem and consider it a general issue, not 
specific to the LPC2000. If competitors do not mention it, it does 
not mean it does not exist there. 

Best regards, Robert

--- In lpc2000@yahoogroups.com, Jayasooriah <jayasooriah@...> wrote:
>
> Dear Robert,
> 
> In the FAQ you referred to, on "ARM7DTMI-S Core", to the FAQ:
> 
> "Can spurious interrupts occur in the LPC200?",
> 
> Your answer is:
> 
> "Yes, spurious interrupts can occur in any ARM7 device that has 
implemented 
> the ARM Primecell Vectored Interrupt Controller (VIC)."
> 
> I tried looking for a reference to this in the ARM site but cannot 
find any.
> 
> A search on "spurious" at the ARM web site yields 11 hits but 
these appear 
> not relevant to the VIC and spurious interrupt problem with the 
ARM design 
> that you seem to allude us to.
> 
> I also did a brief search for information on the web relating to 
spurious 
> interrupts, and all the examples seem to point to LPC one way or 
another.
> 
> A spurious interrupt is a hardware interrupt which is generated by 
system 
> errors (http://www.answers.com/topic/interrupt-1), and systems 
with 
> spurious interrupts in general do not meet compliance requirements.
> 
> Please clarify:
> 
> 1/  Is this spurious interrupt problem an error in LPC 
implementation of 
> VIC or is it an error in ARM Primecell VIC specifications itself?
> 
> 2/  Can you tell us if there are any other ARM cores with VIC that 
also 
> suffer from spurious interrupts problem that the LPC suffers from?
> 
> Kind regards,
> 
> Jaya
> 
> PS:  I realise there has been discussion previously on spurious 
interrupts, 
> but none seem to throw any light on whether this is a problem 
specific to 
> LPC or it has to do with with ARM VIC design itself.
> 
> --- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@> 
wrote:
>  >
>  > Hi,
>  >
>  > have a look at the FAQ here:
>  >
>  > http://www.standardics.philips.com/support/faq/microcontrollers/
>  >
>  > I also added a link in the link section named
>  > "Philips FAQ for LPC2000 devices"
>  >
>  > Regards, Robert
> 
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