Re: AVR AtMega8 SRAM content after reset or power down
- From: "SioL" <Sio_spam_L@xxxxxxxx>
- Date: Thu, 12 May 2005 01:53:47 +0200
"Spehro Pefhany" <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:275581ddj0cgjmdr7vlnmjv3om3nl3vtmj@xxxxxxxxxx
> On Thu, 12 May 2005 00:49:04 +0200, the renowned "SioL"
> <Sio_spam_L@xxxxxxxx> wrote:
>
>>Searched the net without success on this one:
>>Does SRAM content stay the same after reset
>>or various levels of power down on the
>>AtMega8 AVRs. Not concerned about registers,
>>just the SRAM area.
>>
>>There used to be a blurb on this topic on AVRfreaks,
>>I vaguely remember some kind of errata warning about
>>SRAM getting corrupted. Of course right now I can't get
>>to the site (seems to be down).
>>
>>Hope someone has some hands-on experience on this one.
>
> Dunno, but (in general) you probably need an external brownout circuit
> to protect the SRAM from errant CPU activity during periods when the
> power supply voltage is not sufficient to guarantee proper operation.
Sure, I have taken care of that, it will go into sleep or power down mode
via interrupt when the battery backup kicks in, to preserve power.
I'm just not sure whether I can trust the SRAM to stay the way it
was before going into sleep.
Generally some AVR's work with this and some don't. 8515 doesn't,
for example.
--
Siol
------------------------------------------------
Rather than a heartless beep
Or a rude error message,
See these simple words: "File not found."
.
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