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Re: [avr-libc-dev] wdt_enable may fail to enable the watchdog onATmega12

From: Joerg Wunsch
Subject: Re: [avr-libc-dev] wdt_enable may fail to enable the watchdog onATmega1281
Date: Mon, 31 Aug 2009 20:12:42 +0200
User-agent: Mutt/1.5.11

As Weddington, Eric wrote:

> > Instructions such as sts that use two words (32 bits) are not
> > guaranteed to be executed before an interrupt may fire.

> Have you tested this on the ATmega1281?

This behaviour would surprise me a bit, given that the datasheet
chapter about interrupt latency explicitly mentions the increased
latency when the interrupt arrives while a multiword instruction is
currently being executed.

I'd be interested in setting up a test setup that experimentally
verifies this behaviour, as the assumption the next instruction will
still be executed without being interrupted is quite crucial to the

cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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