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Forum: ARM programming with GCC/GNU tools run sam7 with 0 wait stae


Author: nader (Guest)
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i test at91sam7s64 @ 53 mhz with 0 wait state successfully up to
70'C.and -35'C
so can i use always sam7 with 0 wait state when the tempture is under 70
C?is there any special problem in this case?
i want to know what the mean of worse case condition that limit to
30MHZ.is it only mean high tempture?(85 C)or more?

Author: Martin Thomas (Guest)
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nader wrote:
> i test at91sam7s64 @ 53 mhz with 0 wait state successfully up to
> 70'C.and -35'C
> so can i use always sam7 with 0 wait state when the tempture is under 70
> C?is there any special problem in this case?
> i want to know what the mean of worse case condition that limit to
> 30MHZ.is it only mean high tempture?(85 C)or more?

A better place to ask such a device-specific question would be the
at91.com-forum or the at91-yahoo-group. You can even ask Atmel directly
by e-mail.

Author: Clifford Slocombe (clifford)
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nader wrote:
> is it only mean high tempture?(85 C)or more?

Temperature no doubt has an effect, as do manufacturing tolerances. That
is to say, what works on one chip may well not work on another otherwise
identical one, at least not across the whole temperature range.
Basically all bets are off reliability-wise if you exceed the
manufacturer's specs.

If you are intending to write to flash at runtime, you might also need
to test that to ensure it works reliably, or restore the wait state
during write operations.

I suppose power consumption and heat may also increase by over-clocking
the flash; heat is seldom an issue on ARM parts, but if the application
is battery powered, consumption may be important. Might be worth testing
that if it is a concern.

Clifford

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